@article{vivas_vera_dasmohapatra_marquez_van schoubroeck_forfora_azuaje_phillips_jameel_delborne_et al._2024, title={A Multi-Criteria Approach for Quantifying the Impact of Global Megatrends on the Pulp and Paper Industry: Insights into Digitalization, Social Behavior Change, and Sustainability}, volume={8}, ISSN={["2305-6290"]}, url={https://www.mdpi.com/2305-6290/8/2/36}, DOI={10.3390/logistics8020036}, abstractNote={Background: The pulp and paper industry (P&PI) is undergoing significant disruption driven by global megatrends that necessitate advanced tools for predicting future behavior and adapting strategies accordingly. Methods: This work utilizes a multi-criteria framework to quantify the effects of digitalization, changes in social behavior, and sustainability as three major megatrends transforming the P&PI industry, with a specific focus on hygiene tissue products. Thus, the research combines a comprehensive literature review, insights from a Delphi study, and topic modeling to qualitatively and quantitatively assess the present and future impacts of these global megatrends. Results: The findings suggest an urgent need to identify alternative raw materials to prevent potential supply chain disruptions. Moreover, due to shifts in social behavior, it becomes critical for businesses to substantiate their sustainability claims with hard data to avoid the risk of a “greenwashing” perception among consumers. Conclusions: This study provides decision support for strategic planning by highlighting actionable insights, quantitative predictions, and trend analysis, alongside the examination of consumer and market trends. It aims to incorporate diverse stakeholder perspectives and criteria into decision-making processes, thereby enriching the strategic planning and sustainability efforts within the P&PI industry.}, number={2}, journal={LOGISTICS-BASEL}, author={Vivas, Keren A. and Vera, Ramon E. and Dasmohapatra, Sudipta and Marquez, Ronald and Van Schoubroeck, Sophie and Forfora, Naycari and Azuaje, Antonio Jose and Phillips, Richard B. and Jameel, Hasan and Delborne, Jason A. and et al.}, year={2024}, month={Jun} }
 @article{vivas_vera_phillips_forfora_azuaje_zering_chang_delborne_saloni_dasmohapatra_et al._2024, title={An economic analysis of bamboo plantations and feedstock delivered cost in the Southern US for the manufacturing of fiber-based bioproducts}, volume={6}, ISSN={["1932-1031"]}, url={https://doi.org/10.1002/bbb.2634}, DOI={10.1002/bbb.2634}, abstractNote={Abstract Bamboo, recognized for its rapid growth, high yield, and fiber performance is prominent in the fiber‐based bioproduct industry. However, the absence of US industrial bamboo plantations for fiber production necessitates reliance on imports or locally manufactured products using imported bamboo fibers, predominantly from China. This study evaluates the economic viability of cultivating bamboo in the Southern US for fiber production, with a case study on hygiene tissue products. The supply‐chain analysis was assessed to calculate bamboo chips' minimum selling price (MSP) at the farm gate for an 8% internal rate of return (IRR). The MSP, influenced primarily by land rental costs, ranges from USD 48 to 55 per bone‐dry metric ton (BDt). Despite an initial establishment cost of ~USD 2 000 ha −1 and profitability by year 5, bamboo is a viable, long‐term fiber alternative. Successful bamboo cultivation in the US could lead to a more sustainable implementation of alternative non‐wood fibers for hygiene tissue applications.}, journal={BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR}, author={Vivas, Keren A. and Vera, Ramon E. and Phillips, Richard B. and Forfora, Naycari and Azuaje, Ivana and Zering, Kelly and Chang, Hou-Min and Delborne, Jason and Saloni, Daniel and Dasmohapatra, Sudipta and et al.}, year={2024}, month={Jun} }
 @article{urdaneta_kumar_marquez_vera_franco_urdaneta_saloni_venditti_pawlak_jameel_et al._2024, title={Evaluating chemi-mechanical pulping processes of agricultural residues: High-yield pulps from wheat straw for fiber-based bioproducts}, volume={221}, ISSN={["1872-633X"]}, DOI={10.1016/j.indcrop.2024.119379}, journal={INDUSTRIAL CROPS AND PRODUCTS}, author={Urdaneta, Fernando and Kumar, Rajnish and Marquez, Ronald and Vera, Ramon E. and Franco, Jorge and Urdaneta, Isabel and Saloni, Daniel and Venditti, Richard A. and Pawlak, Joel J. and Jameel, Hasan and et al.}, year={2024}, month={Dec} }
 @article{marquez_ontiveros_nardello-rataj_sanson_lequeux_molinier_2024, title={Formulating stable surrogate wood pyrolysis oil-in-oil (O/O) emulsions: The role of asphaltenes evidenced by interfacial dilational rheology}, url={https://doi.org/10.1016/j.cej.2024.153321}, DOI={10.1016/j.cej.2024.153321}, abstractNote={This work presents a novel methodology to obtain stable bio-oil-in-oil emulsions using crude oil endogenous asphaltenes as emulsifiers. This approach provides new insights into the valorization of wood pyrolysis bio-oils through co-processing with crude oils or by direct incorporation in fuels for marine transportation, contributing to a significant reduction of the carbon footprint of these products. Similar to water-crude oil systems, asphaltenes can form a rigid film at the bio-oil / petroleum-derived oil interface, thus limiting droplets coalescence and increasing the emulsion lifetime without requiring additional emulsifier. The evolution of the interfacial layers with the asphaltene content and the nature of the petroleum-derived oil phase were investigated by interfacial rheology. The results show the consolidation of the interfacial layer and the formation of a solid-like film, referred to as "skin" with appropriate asphaltene content and polarity of the oil phase. Changes in the dilational elasticity depend on the asphaltenes aggregation behaviour according to the Yen-Mullins model, and the mechanisms that account for these phenomena are discussed.}, journal={Chemical Engineering Journal}, author={Marquez, Ronald and Ontiveros, Jesús F. and Nardello-Rataj, Véronique and Sanson, Nicolas and Lequeux, François and Molinier, Valérie}, year={2024}, month={Sep} }
 @article{trovagunta_marquez_tolosa_barrios_zambrano_suarez_pal_gonzalez_hubbe_2024, title={Lignin self-assembly phenomena and valorization strategies for pulping, biorefining, and materials development: Part 1. The physical chemistry of lignin self-assembly}, volume={332}, ISSN={["1873-3727"]}, url={http://dx.doi.org/10.1016/j.cis.2024.103247}, DOI={10.1016/j.cis.2024.103247}, abstractNote={Physical chemistry aspects are emphasized in this comprehensive review of self-assembly phenomena involving lignin in various forms. Attention to this topic is justified by the very high availability, low cost, and renewable nature of lignin, together with opportunities to manufacture diverse products, for instance, polymers/resins, bioplastics, carbon fibers, bio-asphalt, sunscreen components, hydrophobic layers, and microcapsules. The colloidal lignin material, nanoparticles, and microstructures that can be formed as a result of changes in solvent properties, pH, or other adjustments to a suspending medium have been shown to depend on many factors. Such factors are examined in this work based on the concepts of self-assembly, which can be defined as an organizing principle dependent on specific attributes of the starting entities themselves. As a means to promote such concepts and to facilitate further development of nano-scale lignin products, this article draws upon evidence from a wide range of studies. These include investigations of many different plant sources of lignin, processes of delignification, solvent systems, anti-solvent systems or other means of achieving phase separation, and diverse means of achieving colloidal stability (if desired) of resulting self-assembled lignin structures. Knowledge of the self-organization behavior of lignin can provide significant structural information to optimize the use of lignin in value-added applications. Examples include chemical conditions and preparation procedures in which lignin-related compounds of particles organize themselves as spheres, hollow spheres, surface-bound layers, and a variety of other structures. Published articles show that such processes can be influenced by the selection of lignin type, pulping or extraction processes, functional groups such as phenolic, carboxyl, and sulfonate, chemical derivatization reactions, solvent applications, aqueous conditions, and physical processes, such as agitation. Precipitation from non-aqueous solutions represents a key focus of lignin self-assembly research. The review also considers stabilization mechanisms of self-assembled lignin-related structures.}, journal={ADVANCES IN COLLOID AND INTERFACE SCIENCE}, author={Trovagunta, Ramakrishna and Marquez, Ronald and Tolosa, Laura and Barrios, Nelson and Zambrano, Franklin and Suarez, Antonio and Pal, Lokendra and Gonzalez, Ronalds and Hubbe, Martin A.}, year={2024}, month={Oct} }
 @article{marquez_ortiz_barrios_vera_patino-agudelo_vivas_salas_zambrano_theiner_2024, title={Surfactants produced from carbohydrate derivatives: Part 2. A review on the value chain, synthesis, and the potential role of artificial intelligence within the biorefinery concept}, volume={5}, ISSN={["1558-9293"]}, url={https://doi.org/10.1002/jsde.12766}, DOI={10.1002/jsde.12766}, abstractNote={Abstract This comprehensive and critical review explores the synthesis and applications of carbohydrate‐based surfactants within the biorefinery concept, focusing on biobased sugar‐head molecules suitable for use across several manufacturing sectors, including cosmetics, pharmaceuticals, household products, detergents, and foods. The main focus relies on sustainable alternatives to conventional surfactants, which could reduce the final manufacturing carbon footprint of several industrial feedstocks and products. A thorough analysis of raw materials, highlighting the significance of feedstock sources, and the current biobased surfactants and rhamnolipid biosurfactants production trends, is presented. Key organic reactions for the production of sorbitan esters, sucrose esters, alkyl polyglycosides, and fatty acid glucamines, such as glycosidation, acylation, and etherification, as well as the production of rhamnolipids through fermentation are described. Given the scarce literature on the characterization of these surfactant types within the hydrophilic–lipophilic deviation (HLD) framework, the surfactant contribution parameter (SCP) in the HLD equation for sugar‐head surfactants is critically assessed. The economic landscape is also discussed, noting the significant growth in the biobased surfactants and biosurfactant market, driven by environmental awareness and regulatory changes, with projections indicating a substantial market increase in the forthcoming years. Finally, the promising potential of generative artificial intelligence (AI) in developing customized surfactant molecules, with optimized properties for targeted applications, is emphasized as a promising avenue for future research.}, journal={JOURNAL OF SURFACTANTS AND DETERGENTS}, author={Marquez, Ronald and Ortiz, Maria S. and Barrios, Nelson and Vera, Ramon E. and Patino-Agudelo, alvaro Javier and Vivas, Keren A. and Salas, Mariangeles and Zambrano, Franklin and Theiner, Eric}, year={2024}, month={May} }
 @article{mittal_terpilowski_grady_marquez_2023, title={23rd International symposium on Surfactants in Solution (SIS-2022)}, volume={10}, ISSN={["1558-9293"]}, url={https://doi.org/10.1002/jsde.12720}, DOI={10.1002/jsde.12720}, abstractNote={Journal of Surfactants and DetergentsEarly View EDITORIAL 23rd International symposium on Surfactants in Solution (SIS-2022) Kash Mittal, Kash Mittal ConsultantSearch for more papers by this authorKonrad Terpilowski, Konrad Terpilowski orcid.org/0000-0002-8078-3644 Department of Chemistry, Maria Curie-Sklodowska University, Lublin, PolandSearch for more papers by this authorBrian Grady, Corresponding Author Brian Grady [email protected] orcid.org/0000-0002-4975-8029 Sustainable Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, Oklahoma, USA Correspondence Brian Grady, Sustainable Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK, USA. Email: [email protected]Search for more papers by this authorRonald Marquez, Ronald Marquez orcid.org/0000-0001-6003-7487 Department of Forest Biomaterials, North Carolina State University, Raleigh, North Carolina, USASearch for more papers by this author Kash Mittal, Kash Mittal ConsultantSearch for more papers by this authorKonrad Terpilowski, Konrad Terpilowski orcid.org/0000-0002-8078-3644 Department of Chemistry, Maria Curie-Sklodowska University, Lublin, PolandSearch for more papers by this authorBrian Grady, Corresponding Author Brian Grady [email protected] orcid.org/0000-0002-4975-8029 Sustainable Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, Oklahoma, USA Correspondence Brian Grady, Sustainable Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK, USA. Email: [email protected]Search for more papers by this authorRonald Marquez, Ronald Marquez orcid.org/0000-0001-6003-7487 Department of Forest Biomaterials, North Carolina State University, Raleigh, North Carolina, USASearch for more papers by this author First published: 06 October 2023 https://doi.org/10.1002/jsde.12720Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Early ViewOnline Version of Record before inclusion in an issue RelatedInformation}, journal={JOURNAL OF SURFACTANTS AND DETERGENTS}, author={Mittal, Kash and Terpilowski, Konrad and Grady, Brian and Marquez, Ronald}, year={2023}, month={Oct} }
 @article{marquez_barrios_vera_mendez_tolosa_zambrano_li_2023, title={A Perspective on The Synergistic Potential of Artificial Intelligence and Product-Based Learning Strategies in Biobased Materials Education}, volume={44}, ISSN={1749-7728}, url={http://dx.doi.org/10.1016/j.ece.2023.05.005}, DOI={10.1016/j.ece.2023.05.005}, abstractNote={The integration of product-based learning strategies in Materials in Chemical Engineering education is crucial for students to gain the skills and competencies required to thrive in the emerging circular bioeconomy. Traditional materials engineering education has often relied on a transmission teaching approach, in which students are expected to passively receive information from instructors. However, this approach has shown to be inadequate under the current circumstances, in which information is readily available and innovative tools such as artificial intelligence and virtual reality environments are becoming widespread (e.g., metaverse). Instead, we consider that a critical goal of education should be to develop aptitudes and abilities that enable students to generate solutions and products that address societal demands. In this work, we propose innovative strategies, such as product-based learning methods and GPT (Generative Pre-trained Transformer) artificial intelligence text generation models, to modify the focus of a Materials in Chemical Engineering course from non-sustainable materials to sustainable ones, aiming to address the critical challenges of our society. This approach aims to achieve two objectives: first to enable students to actively engage with raw materials and solve real-world challenges, and second, to foster creativity and entrepreneurship skills by providing them with the necessary tools to conduct brainstorming sessions and develop procedures following scientific methods. The incorporation of circular bioeconomy concepts, such as renewable resources, waste reduction, and resource efficiency into the curriculum provides a framework for students to understand the environmental, social, and economic implications in Chemical Engineering. It also allows them to make informed decisions within the circular bioeconomy framework, benefiting society by promoting the development and adoption of sustainable technologies and practices.}, journal={Education for Chemical Engineers}, publisher={Elsevier BV}, author={Marquez, Ronald and Barrios, Nelson and Vera, Ramon and Mendez, Maria E. and Tolosa, Laura and Zambrano, Franklin and Li, Yali}, year={2023}, month={May}, pages={164–180} }
 @article{marquez_barrios_vera_mendez_tolosa_zambrano_li_2023, title={A Perspective on The Synergistic Potential of Artificial Intelligence and Product-Based Learning Strategies in Biobased Materials Education}, url={https://doi.org/10.21203/rs.3.rs-2711749/v1}, DOI={10.21203/rs.3.rs-2711749/v1}, abstractNote={Abstract The integration of product-based learning strategies in Materials in Chemical Engineering education is crucial for students to gain the skills and competencies required to thrive in the emerging circular bioeconomy. Traditional materials engineering education has often relied on a transmission teaching approach, in which students are expected to passively receive information from instructors. However, this approach has shown to be inadequate under the current circumstances, in which information is readily available and innovative tools such as artificial intelligence and virtual reality environments are becoming widespread (e.g., metaverse). Instead, we consider that a critical goal of education should be to develop aptitudes and abilities that enable students to generate solutions and products that address societal demands. In this work, we propose innovative strategies, such as product-based learning methods and GPT (Generative Pre-trained Transformer) artificial intelligence text generation models, to modify the focus of a Materials in Chemical Engineering course from unsustainable materials to sustainable ones, aiming to address the critical challenges of our society. This approach aims to achieve two objectives: first to enable students to actively engage with raw materials and solve real-world challenges, and second, to foster creativity and entrepreneurship skills by providing them with the necessary tools to conduct brainstorming sessions and develop procedures following scientific methods. The incorporation of circular bioeconomy concepts, such as renewable resources, waste reduction, and resource efficiency into the curriculum provides a framework for students to understand the environmental, social, and economic implications in chemical engineering. It also allows them to make informed decisions within the circular bioeconomy framework, benefiting society by promoting the development and adoption of sustainable technologies and practices.}, author={Marquez, Ronald and Barrios, Nelson and Vera, Ramon and Mendez, Maria E. and Tolosa, Laura and Zambrano, Franklin and Li, Yali}, year={2023}, month={Mar} }
 @article{marquez_barrios_vera_mendez_tolosa_zambrano_li_2023, title={A Perspective on The Synergistic Potential of Artificial Intelligence and Product-Based Learning Strategies in Biobased Materials Education}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85153113982&partnerID=MN8TOARS}, DOI={10.21203/rs.3.rs-2711749}, journal={ResearchSquare}, author={Marquez, R. and Barrios, N. and Vera, R. and Mendez, M.E. and Tolosa, L. and Zambrano, F. and Li, Y.}, year={2023} }
 @article{ai's next frontier: the rise of chatgpt and its implications on society, industry, and scientific research_2023, url={https://publons.com/wos-op/publon/61103216/}, journal={Ciencia E Ingenieria}, year={2023} }
 @article{marquez_ontiveros_barrios_tolosa_palazzo_nardello-rataj_salager_2023, title={Advantages and limitations of different methods to determine the optimum formulation in surfactant-oil-water systems: A review}, volume={9}, ISSN={["1558-9293"]}, url={https://doi.org/10.1002/jsde.12703}, DOI={10.1002/jsde.12703}, abstractNote={AbstractThe optimum formulation in a surfactant–oil–water (SOW) system is defined as the physicochemical situation at which the surfactant adsorbed at the interface exhibits exactly equal interactions for both oil and water. Identifying the optimum formulation of SOW systems is crucial in various industrial applications, ranging from pharmaceuticals to cosmetics and to petroleum issues like dehydration and enhanced oil recovery. Multiple techniques are available to identify the optimum formulation, often with its own advantages and limitations. In this comprehensive review, we provide an in‐depth analysis of the systematic use of formulation scans to identify the optimum formulation in SOW systems. We critically assess different methods, including conventional ones, such as phase behavior observation, determination of the minimum interfacial tension from equilibrated systems, and the localization of the minimum emulsion stability using formulation scans. We also mention a new promising technique that can be applied in practice, such as oscillating spinning drop interfacial rheology (OSDIR) as well as others that allow an understanding of some structural features of the domains present in the surfactant‐rich phase in SOW systems. Among these methods, dynamic light scattering (DLS), small angle scattering (SAXS and SANS), nuclear magnetic resonance (NMR), X‐ray microcomputed tomography (Micro‐CT), and differential scanning calorimeter (DSC), can be found in the literature. Finally, we discuss potentially unusual behaviors that can appear in complex systems, thus providing guidance on the selection of the most suitable method tailored to the specific application.}, journal={JOURNAL OF SURFACTANTS AND DETERGENTS}, author={Marquez, Ronald and Ontiveros, Jesus F. and Barrios, Nelson and Tolosa, Laura and Palazzo, Gerardo and Nardello-Rataj, Veronique and Salager, Jean Louis}, year={2023}, month={Sep} }
 @article{marquez_acevedo_rondón_graciaa_daridon_salager_2023, title={Breaking of Water-in-Crude Oil Emulsions. 10. Experimental Evidence from a Quartz Crystal Resonator Sensor and an Oscillating Spinning Drop Interfacial Rheometer}, volume={37}, url={https://doi.org/10.1021/acs.energyfuels.2c03717}, DOI={10.1021/acs.energyfuels.2c03717}, abstractNote={The presence of asphaltenes in crude oil is a key factor in stabilizing water-in-oil emulsions. Changes in asphaltene aggregation have a definite effect on the formation of an elastic and highly resistant film that stabilizes such emulsions. Herein, we report asphaltene aggregation changes using two different methods. First, with a quartz crystal resonator sensor, clear changes in the resonant parameters (Δfn and ΔΓn) of the quartz sensor fully immersed in a heavy crude oil + cyclohexane solution were observed when the asphaltene concentration in the solution reached approximately 1000 ppm. Second, using an oscillating spinning drop interfacial rheometer, a distinct discontinuity of the trend of the optimum formulation is found when the asphaltene content CA attains this threshold value. The formulation variation was obtained by two kinds of scans, which were shown to be equivalent: an increase in water salinity for an anionic surfactant-containing system and an ethylene oxide number (EON) decrease of a non-ionic surfactant. In both cases, the hydrophilic surfactant was used as a demulsifier in a fixed concentration CD. It is seen that the variation of the asphaltene concentration CA generates an unexpected sudden change at the interface, according to Winsor's affinity ratio R and hydrophilic–lipophilic deviation (HLD) premises about the compensation of the effect of asphaltenes by a formulation variable change. These newly reported results happening around CA = 1000 ppm could help to further understand how the asphaltene aggregation models and the HLD equation can be tools for the formulator to find fast and efficient answers to crude oil dewatering.}, number={4}, journal={Energy & Fuels}, author={Marquez, Ronald and Acevedo, Nelson and Rondón, Miguel and Graciaa, Alain and Daridon, Jean-Luc and Salager, Jean-Louis}, year={2023}, month={Feb}, pages={2735–2749} }
 @article{li_marquez_2023, title={Can government subsidies and public mechanisms alleviate the physical and mental health vulnerability of China's urban and rural residents?}, volume={22}, url={https://publons.com/wos-op/publon/57020345/}, DOI={10.1186/S12939-022-01805-2}, abstractNote={Poverty vulnerability has been defined as the likelihood of a family falling into poverty in the upcoming months. Inequality is a major cause of poverty vulnerability in developing countries. There is evidence that establishing effective government subsidies and public service mechanisms significantly reduces health poverty vulnerability. One of the ways to study poverty vulnerability is by using empirical data such as income elasticity of demand to perform the analysis. Income elasticity refers to the extent to which changes in consumers' income affect changes in demand for commodities or public goods. In this work, we assess health poverty vulnerability in rural and urban China. We provide two levels of evidence on the marginal effects of the design and implementation of government subsidies and public mechanisms in reducing health poverty vulnerability, before and after incorporating the income elasticity of demand for health.Multidimensional physical and mental health poverty indexes, according to the Oxford Poverty & Human Development Initiative and the Andersen model, were implemented to measure health poverty vulnerability by using the 2018 China Family Panel Survey database (CFPS) as the data source for empirical analysis. The income elasticity of demand for health care was used as the key mediating variable of impact. Our assessment was conducted by a two-level multidimensional logistic regression using STATA16 software.The first level regression indicates that the marginal utility of public mechanism (PM) in reducing urban and rural vulnerability as expected poverty on physical and mental health (VEP-PH&MH) was insignificant. On the other hand, government subsidies (GS) policies had a positive suppression effect on VEP-PH&MH to a relatively low degree. The second level regression found that given the diversity of health needs across individual households, i.e., the income elasticity of demand (HE) for health care products, PM and GS policies have a significant effect in reducing VEP-PH&MH in rural and urban areas. Our analysis has verified the significant positive impact of enacting accurate GS and PM policies on effectively reducing VEP-PH&MH in rural as well as urban areas.This study shows that implementing government subsidies and public mechanisms has a positive marginal effect on reducing VEP-PH&MH. Meanwhile, there are individual variations in health demands, urban-rural disparities, and regional disparities in the effects of GS and PM on inhibiting VEP-PH&MH. Therefore, special consideration needs to be given to the differences in the degree of health needs of individual residents among urban and rural areas and regions with varying economic development. Furthermore, considerations of this approach in the current worldwide scenario are analyzed.}, number={1}, journal={International Journal for Equity in Health}, author={Li, Y. and Marquez, R.}, year={2023} }
 @article{gonzalez_vera_zambrano_marquez_vivas_forfora_bedard_farrell_ankeny_jameel_et al._2023, title={Environmentally Friendly Oxidation Pretreatments to Produce Sugar-Based Building Blocks from Dyed Textile Wastes Via Enzymatic Hydrolysis}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85150405428&partnerID=MN8TOARS}, DOI={10.2139/ssrn.4385542}, journal={SSRN}, author={Gonzalez, R. and Vera, R.E. and Zambrano, F. and Marquez, R. and Vivas, K. and Forfora, N. and Bedard, J. and Farrell, M. and Ankeny, M. and Jameel, H. and et al.}, year={2023} }
 @article{vera_zambrano_marquez_vivas_forfora_bedard_farrell_ankeny_pal_jameel_et al._2023, title={Environmentally friendly oxidation pretreatments to produce sugar-based building blocks from dyed textile wastes via enzymatic hydrolysis}, volume={467}, ISSN={["1873-3212"]}, url={https://doi.org/10.1016/j.cej.2023.143321}, DOI={10.1016/j.cej.2023.143321}, abstractNote={Given the increasing concern over textile waste management and the proliferation of textile landfills, enzymatic hydrolysis of cotton represents a potential pathway to upcycle textile waste into valuable chemical building blocks. However, this pathway is challenged by the presence of persistent dyes, hindering enzyme performance. To overcome this issue, environmentally friendly and total chlorine free oxidation methods such as ozone and alkaline hydrogen peroxide were used in combination with mechanical refining pretreatment. The results showed that the enzymatic conversion of black-dyed cotton, without oxidation, resulted in a glucose yield of only 60% as compared to 95% for undyed cotton fibers. On the other hand, the inclusion of oxidation processes in the pretreatment stage resulted in a glucose yield of 90% via enzymatic hydrolysis at expense of using low oxidation chemicals and low enzyme charges. This work highlights the potential of oxidation methods, enzymatic hydrolysis, and mechanical refining as an ecofriendly pathway for generating value-added chemicals from cotton textile waste while promoting economic circularity.}, journal={CHEMICAL ENGINEERING JOURNAL}, author={Vera, Ramon E. and Zambrano, Franklin and Marquez, Ronald and Vivas, Keren A. and Forfora, Naycari and Bedard, John and Farrell, Matthew and Ankeny, Mary and Pal, Lokendra and Jameel, Hasan and et al.}, year={2023}, month={Jul} }
 @article{barrios_marquez_mcdonald_hubbe_venditti_venditti_pal_2023, title={Innovation in lignocellulosics dewatering and drying for energy sustainability and enhanced utilization of forestry, agriculture, and marine resources - A review}, volume={318}, ISSN={0001-8686}, url={http://dx.doi.org/10.1016/j.cis.2023.102936}, DOI={10.1016/j.cis.2023.102936}, abstractNote={Efficient utilization of forestry, agriculture, and marine resources in various manufacturing sectors requires optimizing fiber transformation, dewatering, and drying energy consumption. These processes play a crucial role in reducing the carbon footprint and boosting sustainability within the circular bioeconomy framework. Despite efforts made in the paper industry to enhance productivity while conserving resources and energy through lower grammage and higher machine speeds, reducing thermal energy consumption during papermaking remains a significant challenge. A key approach to address this challenge lies in increasing dewatering of the fiber web before entering the dryer section of the paper machine. Similarly, the production of high-value-added products derived from alternative lignocellulosic feedstocks, such as nanocellulose and microalgae, requires advanced dewatering techniques for techno-economic viability. This critical and systematic review aims to comprehensively explore the intricate interactions between water and lignocellulosic surfaces, as well as the leading technologies used to enhance dewatering and drying. Recent developments in technologies to reduce water content during papermaking, and advanced dewatering techniques for nanocellulosic and microalgal feedstocks are addressed. Existing research highlights several fundamental and technical challenges spanning from the nano- to macroscopic scales that must be addressed to make lignocellulosics a suitable feedstock option for industry. By identifying alternative strategies to improve water removal, this review intends to accelerate the widespread adoption of lignocellulosics as feasible manufacturing feedstocks. Moreover, this review aims to provide a fundamental understanding of the interactions, associations, and bonding mechanisms between water and cellulose fibers, nanocellulosic materials, and microalgal feedstocks. The findings of this review shed light on critical research directions necessary for advancing the efficient utilization of lignocellulosic resources and accelerating the transition towards sustainable manufacturing practices.}, journal={Advances in Colloid and Interface Science}, publisher={Elsevier BV}, author={Barrios, Nelson and Marquez, Ronald and McDonald, J. David and Hubbe, Martin A. and Venditti, Richard A. and Venditti, A. and Pal, Lokendra}, year={2023}, month={Jun}, pages={102936} }
 @misc{rico_mazabel_egurrola_pulido_barrios_marquez_garcia_2024, title={Meta-Analysis and Analytical Methods in Cosmetics Formulation: A Review}, volume={11}, ISSN={["2079-9284"]}, url={https://www.mdpi.com/2079-9284/11/1/1}, DOI={10.3390/cosmetics11010001}, abstractNote={The ever-evolving cosmetic industry requires advanced analytical techniques to explore, understand, and optimize product performance at nano, micro, and macroscopic levels. Nowadays, these insights are crucial for translating microstructure behavior into macroscopic properties. This knowledge is essential to formulate products with a lower carbon footprint and a higher sustainability profile, incorporating, at the same time, natural or biobased raw materials. These raw materials may present challenges for formulators and analytical scientists due to either an inferior performance when compared to their fossil-derived counterparts or higher costs. This comprehensive review covers a spectrum of analytical methodologies employed in cosmetic formulation, including chromatographic analyses, olfactometry, and electronic nose technology. The characterization of product stability involving assessing parameters such as droplet size, zeta potential, viscosity, analytical centrifugation, surface tension, and interfacial tension are also explored. The discussion in this paper extends to the role of rheology in understanding the molecular structure and behavioral dynamics of cosmetic samples. This review concludes with an overview of colorimetric analysis, a crucial aspect related to consumer perception, followed by a discussion on the challenges and opportunities associated with using meta-analysis methodologies in cosmetics. The formulation of cosmetics employing biobased feedstocks is included, highlighting the evolving landscape of cosmetic science and the integration of sustainable practices. This review stands at the interface between a meta-analysis of cosmetics and product performance, which is attained through a detailed examination of each analytical method. The know-how shared serves as a valuable resource for formulators, researchers, and industry professionals for real-world applications in the analytical field of cosmetics formulation.}, number={1}, journal={COSMETICS}, author={Rico, Felipe and Mazabel, Angela and Egurrola, Greciel and Pulido, Juanita and Barrios, Nelson and Marquez, Ronald and Garcia, Johnbrynner}, year={2024}, month={Feb} }
 @article{occupancy and habitat use by the andean bear are negatively affected by human presence and forest loss_2023, volume={73}, url={https://publons.com/wos-op/publon/58310537/}, DOI={10.1016/J.JNC.2023.126409}, abstractNote={Protected areas require methodologies to monitor the status and effectiveness of species management strategies. In this work, single-species, single-season occupancy models were employed to estimate the occupancy and habitat use of the Andean bear in the Tatamá National Natural Park through a nested design of 1 km2 cells inserted in 16 km2 cells. The occupancy at 16 km2 was ψ16 = 0.89 (E.E. = 0.06), with a detectability p = 0.405 (E.E. = 0.039). When examining the factors influencing the habitat use of the Andean bear at the 1 km2 scale, the four most suitable models for calculating use indicated a most negative relationship between use and the percentage of human activities in the cell (βHA = −1.46 [E.E. 0.61]). Additionally, bear use was found to have the most positive relationship with the forest proportion in the cell (βF = 16.59 [E.E. 13.55]) and Euclidean distance to population centers (βDPC = 1.05 [E.E. 0.82]). These findings allowed for adjusting the Prevention, Surveillance, Control, and Monitoring programs and identifying areas requiring forest cover restoration. The sampling design and effort implemented is able to detect a 25% reduction in occupancy with a statistical significance of α = 0.2 and a statistical power of 1 − β = 0.8.}, journal={Journal for Nature Conservation}, year={2023} }
 @article{marquez_tolosa_gomez_izaguirre_rennola_bullon_sandia_2023, title={Reproducing an innovation environment in the classroom. A strategy to promote creativity in Chemical Engineering education}, url={https://doi.org/10.26434/chemrxiv-2023-lbqv5}, DOI={10.26434/chemrxiv-2023-lbqv5}, abstractNote={The teaching-learning process in traditional university education uses strategies that position the student as a recipient of information conveyed by the teacher and conceptualized as knowledge. The reality in which we live, including the characteristics of new generational groups, requires the generation of training solutions that meet the needs of individuals in developing skills or know-how. This approach creates responses to societal needs, forming individuals capable of continuously seeking knowledge and being trained to create and innovate. In this paper, we present the results of applying the strategy 'Reproduction of an Environment of Innovation in the Classroom' (RAIS) in courses of the Chemical Engineering curriculum at the Universidad de Los Andes, Mérida-Venezuela. This is a teaching-learning and evaluation strategy where the student is actively involved in constructing and generating knowledge, developing the programmatic competencies in the courses through the execution of a product. The RAIS strategy was applied in the Physical Chemistry for Chemical Engineers, Industrial Chemistry I, and Industrial Chemistry Laboratory courses. Students successfully produced a product, utilizing know-how in each course area. Additionally, this strategy increased motivation compared to other courses based on masterclasses, and enhanced the ability to develop and find solutions in work environments with multidisciplinary groups.}, author={Marquez, Ronald and Tolosa, Laura and Gomez, Ruben and Izaguirre, Cesar and Rennola, Leonardo and Bullon, Johnny and Sandia, Beatriz}, year={2023}, month={Dec} }
 @article{salager_marquez_rondón_bullón_graciaa_2023, title={Review on Some Confusion Produced by the Bicontinuous Microemulsion Terminology and Its Domains Microcurvature: A Simple Spatiotemporal Model at Optimum Formulation of Surfactant-Oil-Water Systems}, volume={8}, url={https://doi.org/10.1021/acsomega.3c00547}, DOI={10.1021/acsomega.3c00547}, abstractNote={Fundamental studies have improved understanding of molecular-level properties and behavior in surfactant-oil-water (SOW) systems at equilibrium and under nonequilibrium conditions. However, confusion persists regarding the terms "microemulsion" and "curvature" in these systems. Microemulsion refers to a single-phase system that does not contain distinct oil or water droplets but at least four different structures with globular domains of nanometer size and sometimes arbitrary shape. The significance of "curvature" in such systems is unclear. At high surfactant concentrations (typically 30 wt % or more), a single phase zone has been identified in which complex molecular arrangements may result in light scattering. As surfactant concentration decreases, the single phase is referred to as a bicontinuous microemulsion, known as the middle phase in a Winsor III triphasic system. Its structure has been described as involving simple or multiple surfactant films surrounding more or less elongated excess oil and water phase globules. In cases where the system separates into two or three phases, known as Winsor I or II systems, one of the phases, containing most of the surfactant, is also confusedly referred to as the microemulsion. In this surfactant-rich phase, the only curved objects are micellar size structures that are soluble in the system and have no real interface but rather exchange surfactant molecules with the external liquid phase at an ultrafast pace. The use of the term "curvature" in the context of these complex microemulsion systems is confusing, particularly when applied to merged nanometer-size globular or percolating domains. In this work, we discuss the terms "microemulsion" and "curvature", and the most simple four-dimensional spatiotemporal model is proposed concerning SOW equilibrated systems near the optimum formulation. This model explains the motion of surfactant molecules due to Brownian movement, which is a quick and arbitrary thermal fluctuation, and limited to a short distance. The resulting observation and behavior will be an average in time and in space, leading to a permanent change in the local microcurvature of the aggregate, thus changing the average from micelle-like to inverse micelle-like order over an extremely short time. The term "microcurvature" is used to explain the small variations of globule size and indicates a close-to-zero mean curvature of the surfactant-containing film surface shape.}, number={10}, journal={ACS Omega}, author={Salager, Jean-Louis and Marquez, Ronald and Rondón, Miguel and Bullón, Johnny and Graciaa, Alain}, year={2023}, month={Mar}, pages={9040–9057} }
 @article{vera_suarez_zambrano_marquez_bedard_vivas_pifano_farrell_ankeny_jameel_et al._2023, title={Upcycling cotton textile waste into bio-based building blocks through an environmentally friendly and high-yield conversion process}, volume={189}, ISSN={["1879-0658"]}, url={https://doi.org/10.1016/j.resconrec.2022.106715}, DOI={10.1016/j.resconrec.2022.106715}, abstractNote={This work presents mechanical refining as a chemical-free pretreatment of cotton textile waste to be converted into glucose via enzymatic hydrolysis. Both Cellic® CTec2 and CTec3 cellulase enzymes were evaluated to perform the enzymatic hydrolysis. Mechanical refining enabled cotton fiber fibrillation, thus increasing its specific surface area, water swellability, enzyme adsorption, and the efficiency of cotton conversion into sugars. Compared to conventional pretreatments, mechanical refining promoted sugar yields above 90% after enzymatic hydrolysis at lower enzyme usage (4–6 FPU/O.D g). From experimental data, a non-linear model was developed to predict cotton conversion. The predictive model allowed the optimization of the conversion process, which resulted in maximum yields of 89.3 and 98.3% when CTec2 and CTec3 were respectively used. Results from this work open the window to deploy mechanical refining as a promising and more sustainable transformation approach to produce sugar-based building blocks within the circular economy framework of textile waste.}, journal={RESOURCES CONSERVATION AND RECYCLING}, author={Vera, Ramon E. and Suarez, Antonio and Zambrano, Franklin and Marquez, Ronald and Bedard, John and Vivas, Keren A. and Pifano, Alonzo and Farrell, Matthew and Ankeny, Mary and Jameel, Hasan and et al.}, year={2023}, month={Feb} }
 @article{salager_graciaa_marquez_2022, title={Analyzing the surfactant classification confusion through the HLD formulation equation}, volume={8}, url={https://doi.org/10.1016/j.jciso.2022.100060}, DOI={10.1016/j.jciso.2022.100060}, abstractNote={The qualitative presentation from Winsor on an interfacial balance of interactions between the surfactant and the oil and water phases has been transformed into a multivariable linear equation so-called hydrophilic-lipophilic deviation (HLD). This relation involves at least 6 independent variables (surfactant head and tail specifications, water salinity, oil nature, temperature, and pressure) with a MacLaurin series first order approximation, i.e., a linear multivariable expression. After 40 years of practical experience, it can be said that the HLD relation matches well the experimental data, with only very few exceptions with complex mixtures. Herein, we clear the confusion concerning the meaning and the mathematical handling of the surfactant parameter in the HLD equation. We start with a presentation of simple surfactant systems with only 4 parameters (water salinity, oil nature, surfactant nature, and temperature) as was done 40 years ago. Later, we present a critical discussion on the surfactant term, concerning binary surfactant systems, and on strategies for applications in ternary surfactant mixtures. We have found that the surfactant parameters can only be compared in a series of surfactants with the same head group, where the surfactant parameter is a linear function of the surfactant tail length.}, journal={JCIS Open}, author={Salager, Jean-Louis and Graciaa, Alain and Marquez, Ronald}, year={2022}, month={Dec} }
 @article{patete_marquez_2022, title={Computer Animation Education Online: A Tool to Teach Control Systems Engineering throughout the COVID-19 Pandemic}, volume={12}, url={https://www.mdpi.com/2227-7102/12/4/253}, DOI={10.3390/educsci12040253}, abstractNote={The world is changing, and university education must be able to adapt to it. New technologies such as artificial intelligence and robotics are requiring tools such as simulation and process control to develop products and services. Thus, control systems engineering schools are adapting to new educational frameworks tailored to deploy promising and feasible new technologies. Herein, we have relied on computer animation-based education and its implementation as an online project-based strategy to attain the objectives and goals of the control systems engineering courses at University of Los Andes, Venezuela. The ControlAnimation library developed in Mathematica program in 2002 has been used as a tool to teach control systems engineering courses since 2008 and with greater prominence since 2020, when the stay-at-home orders due to the COVID-19 pandemic were enacted. Consequently, computer animation-based education has proven its feasibility as an online tool combined with project-based learning techniques, thus allowing students to interact with an animated control system by changing the mathematical model and the design parameters of control laws in a comfortable and somewhat playful way. This enabled new capabilities to study the dynamic behaviors of primordial control systems online. In addition, it allowed students to co-identify and relate in a more intuitive way to the mathematical models and control equations with the physical behavior of the real control systems.}, number={4}, journal={Education Sciences}, publisher={MDPI AG}, author={Patete, Anna and Marquez, Ronald}, year={2022}, month={Apr}, pages={253} }
 @article{zambrano_marquez_vera_jameel_venditti_gonzalez_2022, title={Developing Alternative, High-Absorbency Brown Fibers: Tissue Paper from Upcycled Corrugated Packaging Waste to Meet New Consumer Trends}, volume={9}, ISSN={["2168-0485"]}, url={https://doi.org/10.1021/acssuschemeng.2c03280}, DOI={10.1021/acssuschemeng.2c03280}, abstractNote={Consumers' rising interest in brown tissue papers, perceived as sustainable, has increased the market share and selling prices of such products despite their limited performance. Meanwhile, the current excess of packaging waste in the US has created an opportunity for using old corrugated containerboard (OCC) as an alternative source of brown pulp, despite its inferior tissue-making characteristics relative to bleached fibers. Strength, water absorption capacity, and absorption rate are among the crucial properties of absorbent tissue products. Herein, we studied the feasibility of total chlorine-free treatments, namely, oxygen delignification, alkaline hydrogen peroxide, and ozonation, to improve the tissue-making quality of OCC pulp. The processes evaluated reduced the lignin content (kappa number from 89 to values as low as 55) and generated brightness gains as high as 8.8% ISO units. The strength of the sheets also improved due to the delignification and increase in fiber swelling. Chemically treated OCC resulted in sheets with higher water absorption capacity and absorption rate and fiber slurries with higher freeness compared to sheets and slurries from mechanically refined OCC. Therefore, we demonstrate the application of treatments with low environmental impact to upcycle OCC into a high-quality brown pulp suitable for manufacturing high-performance tissue paper.}, number={40}, journal={ACS SUSTAINABLE CHEMISTRY & ENGINEERING}, author={Zambrano, Franklin and Marquez, Ronald and Vera, Ramon and Jameel, Hasan and Venditti, Richard and Gonzalez, Ronalds}, year={2022}, month={Sep} }
 @article{salager_marquez_bullon_forgiarini_2022, title={Formulation in Surfactant Systems: From-Winsor-to-HLD<sub>N</sub>}, volume={2}, url={https://www.mdpi.com/2673-8392/2/2/54}, DOI={10.3390/encyclopedia2020054}, abstractNote={Formulation is an ancient concept, although the word has been used only recently. The first formulations made our civilization advance by inventing bronze, steel, and gunpowder; then, it was used in medieval alchemy. When chemistry became a science and with the golden age of organic synthesis, the second formulation period began. This made it possible to create new chemical species and new combinations “à la carte.” However, the research and developments were still carried out by trial and error. Finally, the third period of formulation history began after World War II, when the properties of a system were associated with its ingredients and the way they were assembled or combined. Therefore, the formulation and the systems’ phenomenology were related to the generation of some synergy to obtain a commercial product. Winsor’s formulation studies in the 1950s were enlightening for academy and industries that were studying empirically surfactant-oil-water (SOW) systems. One of its key characteristics was how the interfacial interaction of the adsorbed surfactant with oil and water phases could be equal by varying the physicochemical formulation of the system. Then, Hansen’s solubility parameter in the 1960s helped to reach a further understanding of the affinity of some substances to make them suitable to oil and water phases. In the 1970s, researchers such as Shinoda and Kunieda, and different groups working in Enhanced Oil Recovery (EOR), among them Schechter and Wade’s group at the University of Texas, made formulation become a science by using semiempirical correlations to attain specific characteristics in a system (e.g., low oil-water interfacial tension, formulation of a stable O/W or W/O emulsion, or high-performance solubilization in a bicontinuous microemulsion system at the so-called optimum formulation). Nowadays, over 40 years of studies with the hydrophilic-lipophilic deviation equation (HLD) have made it feasible for formulators to improve products in many different applications using surfactants to attain a target system using HLD in its original or its normalized form, i.e., HLDN. Thus, it can be said that there is still current progress being made towards an interdisciplinary applied science with numerical guidelines. In the present work, the state-of-the-art of formulation in multiphase systems containing two immiscible phases like oil and water, and therefore systems with heterogeneous or micro-heterogeneous interfaces, is discussed. Surfactants, from simple to complex or polymeric, are generally present in such systems to solve a wide variety of problems in many areas. Some significant cases are presented here as examples dealing with petroleum, foods, pharmaceutics, cosmetics, detergency, and other products occurring as dispersions, emulsions, or foams that we find in our everyday lives.}, number={2}, journal={Encyclopedia}, publisher={MDPI AG}, author={Salager, Jean-Louis and Marquez, Ronald and Bullon, Johnny and Forgiarini, Ana}, year={2022}, month={Apr}, pages={778–842} }
 @article{formulation of a eugenol-based o/w emulsion for application as a topical and oral anesthetic by low-energy emulsification_2022, url={https://publons.com/wos-op/publon/52368878/}, journal={Ciencia E Ingenieria}, year={2022} }
 @article{salager_marquez_delgado-linares_rondon_forgiarini_2022, title={Fundamental Basis for Action of a Chemical Demulsifier Revisited after 30 Years: HLDN as the Primary Criterion for Water-in-Crude Oil Emulsion Breaking}, volume={1}, url={https://doi.org/10.1021/acs.energyfuels.1c03349}, DOI={10.1021/acs.energyfuels.1c03349}, abstractNote={In the past four decades, many experimental studies have confirmed the systematic events occurring at the so-called optimum formulation of surfactant–oil–water systems. At this particular formulation, the adsorbed surfactant at the interface interacts equally with water and oil phases, which is supposed to occur according to Winsor theory to attain a three-phase behavior. A low minimum interfacial tension has been confirmed to take place at optimum in hundreds of reports on enhanced oil recovery (EOR). It also coincides with a very definite minimum in emulsion stability, which is looked after for chemical dehydration or crude oil desalting. A normalized hydrophilic–lipophilic deviation (HLDN) equation was proposed as a multivariable expression that numerically estimates the difference of the surfactant interactions with oil and water. This concept can be applied in crude oil emulsion breaking by considering asphaltenes as being in part a lipophilic surfactant whose effect must be compensated by a hydrophilic demulsifier surfactant to reach the optimum formulation. This is attained through equivalence effects by changing two or more variables, particularly asphaltenes and demulsifier type and concentration, which can be measured through different techniques. Furthermore, in recent studies, asphaltenes are found to exhibit two different lipophilicity levels depending on their self-gathering at or close to the interface, for example, as flat bidimensional nanoaggregates or as three-dimensional clusters. This review presents the know-how reached after 30 years of studying water-in-crude oil emulsion breaking (also known as chemical dehydration) using a formulation approach with the HLD multivariable expression. The first part reviews the fundamental concepts and advances on the HLD equation in relation to simple and complex mixtures. The second part presents several strategies aimed at increasing performance and decreasing demulsifier dosification using the HLDN normalized equation in a qualitative way as well as a quantitative way.}, number={2}, journal={Energy & Fuels}, publisher={American Chemical Society (ACS)}, author={Salager, Jean-Louis and Marquez, Ronald and Delgado-Linares, Jose G. and Rondon, Miguel and Forgiarini, Ana}, year={2022}, month={Jan}, pages={711–730} }
 @article{li_zambrano_wang_marquez_2022, title={How China's Foreign Waste Ban Will Reshape the US Recycling Supply Chain: Economic and Environmental Considerations towards a Circular Economy Oriented Paper Recycling Industry}, volume={17}, ISSN={["1930-2126"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85134501507&partnerID=MN8TOARS}, DOI={10.15376/biores.17.2.3178-3201}, abstractNote={Until recently, China was the largest scrap and unsorted waste importer in the world. Chinese industries sorted the imported wastes and recovered plastic, paper, textiles, and metals, using them as raw materials for manufacturing processes. Since 2013, the Chinese government has imposed measures to ban the import of wastes, the latest one being the “National Sword” policy (fully deployed in January 2021), banning the import of unsorted and recycled wastes. As a result, collecting wastes and recyclables and sending them to China is no longer an option; this has drastically affected the recycling industry supply chain with considerable consequences. This study analyzed the development of Chinese foreign policies on the export of paper waste materials from the U.S. and their specific impact on the recovered paper recycling industry. The economic and environmental consequences of the policy on the U.S. paper recycling industry were analyzed using three scenarios: landfilling (as a baseline), incineration, and recycling. The CO2 emissions were estimated and then compared. It was found that recycling would result in the largest reduction in greenhouse gases. Although recycling was the best evaluated scenario, it has the greatest costs; therefore, possible solutions towards adding value to paper wastes were analyzed.}, number={2}, journal={BIORESOURCES}, author={Li, Yali and Zambrano, Franklin and Wang, Yuhan and Marquez, Ronald}, year={2022}, month={May}, pages={3178–3201} }
 @article{how to use in practice a simplified hldn linear equation for surfactant mixtures_2022, url={https://publons.com/wos-op/publon/56705372/}, journal={Journal of the American Oil Chemists' Society}, year={2022} }
 @article{innovative biofuels derived from wood pyrolysis bio-oil. compatibility with petroleum cuts for applications in marine transportation_2022, url={https://publons.com/wos-op/publon/56705373/}, journal={Journal of the American Oil Chemists' Society}, year={2022} }
 @article{marquez_zwilling_zambrano_tolosa_marquez_venditti_jameel_gonzalez_2022, title={Nanoparticles and essential oils with antiviral activity on packaging and surfaces: An overview of their selection and application}, volume={7}, ISSN={["1558-9293"]}, url={https://doi.org/10.1002/jsde.12609}, DOI={10.1002/jsde.12609}, abstractNote={AbstractUntil recently, food packaging has been used as a barrier to unfavorable environmental and microbial conditions, but new technologies are arising aimed at upgrading the protective nature of these materials. Cases of bacterial and viral transmission through food and surfaces have shown the vulnerabilities of the food packaging distribution systems over the years, creating awareness about new methods to prevent the proliferation of pathogens. This has been highlighted by safety concerns due to the COVID‐19 pandemic. This work reviews the state‐of‐the‐art biobased technologies tailored for antiviral applications on surfaces, focusing on packaging materials. A survey and selection tool of essential oils (EOs) and nanoparticles that have been proven effective in reducing the proliferation or transmission of viruses through surfaces is presented. Additionally, the use of essential oil formulations or nanoparticle‐functionalized biobased materials that can be deployed to prevent virus transmission through food produce and surfaces is reviewed, including environmental and safety concerns around the use of metal nanoparticles and EOs in packaging materials. Finally, an assessment of the available technologies, challenges, opportunities and the potential role of biobased antiviral surfaces in future viral outbreaks is presented.}, number={6}, journal={JOURNAL OF SURFACTANTS AND DETERGENTS}, publisher={Wiley}, author={Marquez, Ronald and Zwilling, Jacob and Zambrano, Franklin and Tolosa, Laura and Marquez, Maria E. and Venditti, Richard and Jameel, Hasan and Gonzalez, Ronalds}, year={2022}, month={Jul} }
 @article{meza_alvarado_márquez_forgiarini_2022, title={Performance Evaluation of Demulsifier Using the Optimum Formulation HLD Concept: A Practical Case Using Heavy Crude Oil Diluted in Naphtha or in Synthetic Aromatic Oil}, volume={27}, url={https://publons.com/wos-op/publon/52160399/}, DOI={10.2118/209577-PA}, abstractNote={Summary
               Asphaltene-stabilized water-in-oil (W/O) emulsions can cause severe problems during oil production and transportation. These emulsions are broken by adding a demulsifying agent at a suitable concentration (CD*) to obtain the optimal formulation, with minimal emulsion stability (stability*). Herein, we studied, from a phenomenological point of view, the performance of two demulsifiers on W/O emulsion breaking with high asphaltene content. A very simple polyethoxylated nonylphenol demulsifier (6EO) and a complex commercial demulsifier (COD) were studied. The influence of the chemical nature of the oil phase on the performance of the demulsifiers was evaluated. The emulsion stability* and CD* values of W/O systems of heavy crude oil diluted in cyclohexane (Systems A and B) were compared to W/O emulsions composed by a heavy crude oil diluted in heavy naphtha or in an aromatic synthetic crude oil as the oil phase (Systems C and D). The results show that demulsifier performance improves significantly when the crude oil is diluted in heavy naphtha and in aromatic synthetic crude oil, obtaining unstable W/O emulsions (rupture time of 10−2–10−1 minutes). In the latter cases, the CD* value is significantly lower and with a wide area of low emulsion stability compared to systems formulated with crude oil diluted in cyclohexane. The mechanisms that generate this type of behavior are discussed and strategies to increase performance and robustness analyzed.}, number={4}, journal={SPE Journal}, author={Meza, L. and Alvarado, J. G. and Márquez, R. and Forgiarini, A.}, year={2022}, pages={1856–1868} }
 @article{ortiz_alvarado_zambrano_marquez_2022, title={Surfactants produced from carbohydrate derivatives: A review of the biobased building blocks used in their synthesis}, volume={1}, url={https://doi.org/10.1002/jsde.12581}, DOI={10.1002/jsde.12581}, abstractNote={AbstractThis work reviews the use of carbohydrates and their derivatives as renewable raw materials in the production of surfactants. Methods to attain state‐of‐the‐art carbohydrate‐derived surfactants are described. This includes surfactants widely used nowadays and others that have not yet transcended beyond the academic field. Given the abundance of hydroxyl groups in carbohydrates and the considerable quantity of different surfactant structures that can be generated during their synthesis, selectively obtaining a target product represents a challenge. Therefore, this work focuses on the platform chemicals available to synthesize biobased surfactants. The first part of the review comprises a brief introduction of simple and complex carbohydrates to better understand their chemistry. Then, a description of the processes to obtain biobased building blocks derived from carbohydrates according to the National Renewable Energy Laboratory (NREL, USA), and their usefulness in synthesizing surfactants is presented. This provides an organized inventory of the knowledge around the synthesis–production of surfactants from carbohydrate derivatives, emphasizing raw materials that could be inserted into the circular bioeconomy concept. Finally, the current industry trends and the potential role of biobased surfactants around new dioxane regulations are discussed.}, number={2}, journal={Journal of Surfactants and Detergents}, publisher={Wiley}, author={Ortiz, Maria Soledad and Alvarado, Jose Gregorio and Zambrano, Franklin and Marquez, Ronald}, year={2022}, month={Mar}, pages={147–183} }
 @article{the spinning drop method: an accurate technique to study interfaces at low interfacial tensions_2022, url={https://publons.com/wos-op/publon/57020354/}, journal={Journal of the American Oil Chemists' Society}, year={2022} }
 @article{vera_zambrano_suarez_pifano_marquez_farrell_ankeny_jameel_gonzalez_2022, title={Transforming textile wastes into biobased building blocks via enzymatic hydrolysis: A review of key challenges and opportunities}, volume={9}, url={http://dx.doi.org/10.1016/j.clcb.2022.100026}, DOI={10.1016/j.clcb.2022.100026}, abstractNote={Textile waste generation in the United States represents approximately 17 million tons per year, constituting a serious environmental problem. Solutions to this situation have led to upcycling cotton-derived textile waste into value-added chemicals through enzymatic hydrolysis. Direct enzymatic treatment of cotton textile materials results in low yields given their high degree of crystallinity and the presence of dyes. Thus, several pretreatment methods have been proposed to improve performance in converting textile materials into glucose and other biobased building blocks. However, high yields are attained at the expense of high enzyme loads, energy usage, and chemical demands. This work reviews the reported literature and successful examples on pretreatment methods to transform cotton textile materials into glucose and its upcycling into biobased building blocks, focusing on the challenges when dyes are present in cotton garments. A comparison of the feasibility of such processes is overviewed from an economic and environmental standpoint. We end by discussing on the need to deploy less chemical intensive pretreatments and possible solutions for enzyme accessibility to cotton fibers.}, journal={Cleaner and Circular Bioeconomy}, publisher={Elsevier BV}, author={Vera, Ramon E. and Zambrano, Franklin and Suarez, Antonio and Pifano, Alonzo and Marquez, Ronald and Farrell, Matthew and Ankeny, Mary and Jameel, Hasan and Gonzalez, Ronalds}, year={2022}, month={Sep}, pages={100026} }
 @article{vera_suarez_zambrano_marquez_bedard_vivas_pifano_farrell_ankeny_jameel_et al._2022, title={Upcycling Cotton Textile Waste into Bio-Based Building Blocks Through an Environmentally Friendly and High-Yield Conversion Process}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85134085368&partnerID=MN8TOARS}, journal={SSRN}, author={Vera, R.E. and Suarez, A. and Zambrano, F. and Marquez, R. and Bedard, J. and Vivas, K.A. and Pifano, A. and Farrell, M. and Ankeny, M. and Jameel, H. and et al.}, year={2022} }
 @article{forgiarini_marquez_salager_2021, title={Formulation Improvements in the Applications of Surfactant–Oil–Water Systems Using the HLDN Approach with Extended Surfactant Structure}, volume={26}, url={https://doi.org/10.3390/molecules26123771}, DOI={10.3390/molecules26123771}, abstractNote={Soap applications for cleaning and personal care have been used for more than 4000 years, dating back to the pharaonic period, and have widely proliferated with the appearance of synthetic surfactants a century ago. Synthetic surfactants used to make macro-micro-nano-emulsions and foams are used in laundry and detergency, cosmetics and pharmaceuticals, food conditioning, emulsified paints, explosives, enhanced oil recovery, wastewater treatment, etc. The introduction of a multivariable approach such as the normalized hydrophilic–lipophilic deviation (HLD N) and of specific structures, tailored with an intramolecular extension to increase solubilization (the so-called extended surfactants), makes it possible to improve the results and performance in surfactant–oil–water systems and their applications. This article aims to present an up-to-date overview of extended surfactants. We first present an introduction regarding physicochemical formulation and its relationship with performance. The second part deals with the importance of HLD N to make a straightforward classification according to the type of surfactants and how formulation parameters can be used to understand the need for an extension of the molecule reach into the oil and water phases. Then, extended surfactant characteristics and strategies to increase performance are outlined. Finally, two specific applications, i.e., drilling fluids and crude oil dewatering, are described.}, number={12}, journal={Molecules}, publisher={MDPI AG}, author={Forgiarini, Ana M. and Marquez, Ronald and Salager, Jean-Louis}, year={2021}, month={Jun}, pages={3771} }
 @article{how to avoid the current confusion in using the sow generalized formulation expression hld=0 for optimum formulation_2021, url={https://publons.com/wos-op/publon/50043126/}, DOI={10.21748/AM21.276}, journal={Journal of the American Oil Chemists' Society}, year={2021} }
 @article{marquez_meza_alvarado_bullon_langevin_forgiarini_salager_2021, title={Interfacial Rheology Measured with a Spinning Drop Interfacial Rheometer: Particularities in More Realistic Surfactant-Oil-Water Systems Close to Optimum Formulation at HLDN=0}, volume={24}, ISSN={["1558-9293"]}, url={https://doi.org/10.1002/jsde.12502}, DOI={10.1002/jsde.12502}, abstractNote={AbstractThree different cases were selected to study the effect of physicochemical formulation on interfacial rheology properties of surfactant–oil–water (SOW) systems by increasing the complexity of the system from a basic case. This was performed by changing the normalized hydrophilic–lipophilic deviation (HLDN) to attain the optimum formulation at HLDN = 0. Two types of SOW systems were studied: the first one used an ionic surfactant with a salinity scan, and the second one a mixture of two nonionic surfactants in a formulation scan produced by changing their proportion. Both of them contained cyclohexane as a pure oil phase, without alcohol. Sec‐butanol was then added as a co‐surfactant with hardly any formulation influence on HLDN. The complexity in interfacial rheology was then increased by changing the oil to a light crude with low asphaltene content. The interfacial rheology is also reported for a realistic system with a high asphaltene content comprised of crude oil diluted in cyclohexane with a conventional surfactant and a commercial demulsifier. The findings confirm that at optimum formulation and whatever the scanning variable (salinity, average ethylene oxide number in the nonionic surfactant mixture, or surfactant/demulsifier concentration), the interfacial tension, and interfacial elastic moduli E, E′, and E″ exhibit a deep minimum. These observations are related to the acceleration of the surfactant exchanges between the interface, oil, and water, near the optimum formulation. Several arguments are put forward to explain how these findings could contribute to the decrease in emulsion stability at HLDN = 0.}, number={4}, journal={JOURNAL OF SURFACTANTS AND DETERGENTS}, publisher={Wiley}, author={Marquez, Ronald and Meza, Luz and Alvarado, Jose G. and Bullon, Johnny and Langevin, Dominique and Forgiarini, Ana M. and Salager, Jean-Louis}, year={2021}, month={Jul}, pages={587–601} }
 @article{synthesis and structural characterization of the d,l-valine hydantoin compound,síntesis y caracterización estructural del compuesto hidantoína de d,l-valina_2021, volume={16}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85123735578&partnerID=MN8TOARS}, number={3}, journal={Avances en Quimica}, year={2021}, pages={49–55} }
 @article{synthesis and structural characterization of the d,l-valine hydantoin compound,síntesis y caracterización estructural del compuesto hidantoína de d,l-valina_2021, volume={16}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85123735578&partnerID=MN8TOARS}, number={3}, journal={Avances en Quimica}, year={2021}, pages={49–55} }
 @article{marquez_bullon_forgiarini_salager_2021, title={The Oscillatory Spinning Drop Technique. An Innovative Method to Measure Dilational Interfacial Rheological Properties of Brine-Crude Oil Systems in the Presence of Asphaltenes}, volume={5}, url={https://doi.org/10.3390/colloids5030042}, DOI={10.3390/colloids5030042}, abstractNote={The oscillatory spinning drop method has been proven recently to be an accurate technique to measure dilational interfacial rheological properties. It is the only available equipment for measuring dilational moduli in low interfacial tension systems, as it is the case in applications dealing with surfactant-oil-water three-phase behavior like enhanced oil recovery, crude oil dehydration, or extreme microemulsion solubilization. Different systems can be studied, bubble-in-liquid, oil-in-water, microemulsion-in-water, oil-in-microemulsion, and systems with the presence of complex natural surfactants like asphaltene aggregates or particles. The technique allows studying the characteristics and properties of water/oil interfaces, particularly when the oil contains asphaltenes and when surfactants are present. In this work, we present a review of the measurements of crude oil-brine interfaces with the oscillating spinning drop technique. The review is divided into four sections. First, an introduction on the oscillating spinning drop technique, fundamental and applied concepts are presented. The three sections that follow are divided according to the complexity of the systems measured with the oscillating spinning drop, starting with simple surfactant-oil-water systems. Then the complexity increases, presenting interfacial rheology properties of crude oil-brine systems, and finally, more complex surfactant-crude oil-brine systems are reviewed. We have found that using the oscillating spinning drop method to measure interfacial rheology properties can help make precise measurements in a reasonable amount of time. This is of significance when systems with long equilibration times, e.g., asphaltene or high molecular weight surfactant-containing systems are measured, or with systems formulated with a demulsifier which is generally associated with low interfacial tension.}, number={3}, journal={Colloids and Interfaces}, publisher={MDPI AG}, author={Marquez, Ronald and Bullon, Johnny and Forgiarini, Ana and Salager, Jean-Louis}, year={2021}, month={Aug}, pages={42} }
 @article{understanding covid-19 effect on the u.s. supply chain of strategic products: important factors, current situation, and future perspective_2021, url={https://publons.com/wos-op/publon/36086767/}, journal={Ciencia E Ingenieria}, year={2021} }
 @article{zambrano_marquez_jameel_venditti_gonzalez_2021, title={Upcycling strategies for old corrugated containerboard to attain high-performance tissue paper: A viable answer to the packaging waste generation dilemma}, volume={175}, ISSN={0921-3449}, url={http://dx.doi.org/10.1016/j.resconrec.2021.105854}, DOI={10.1016/J.RESCONREC.2021.105854}, abstractNote={This study evaluated the suitability of old corrugated containerboard (OCC) to be upcycled into a high-quality pulp for tissue paper manufacture. The evolution of the physicochemical properties of OCC fibers and their effect on tissue properties were tracked across each stage of two elemental chlorine free (ECF) bleaching sequences. The properties of bleached OCC were compared to those of deinked pulp (DIP), southern bleached softwood kraft (SBSK), and refined OCC unbleached. Both sequences reduced the kappa number from 89 to negligible values and increased brightness from 18.9% to ca. 75% ISO, on average 6.2% ISO units below that of DIP. Overall, bleaching significantly increased tensile index and absorbency rate while having adverse effects on bulk and softness and minor impacts on absorption capacity. The change in properties was correlated to the improved fiber bondability and fiber wettability derived from the lignin removal. Compared to DIP, bleached OCC exhibited a higher tensile index, higher freeness, and similar absorption capacity but lower softness. It also showed higher absorption capacity and similar softness than SBSK but lower freeness at a comparable tensile index. The results indicate that upgraded OCC could be used as an alternative fiber to address the forecasted shortage of high-grade recycled papers in recycled tissue grades or replace virgin fibers in producing virgin tissue grades. In addition, it was determined that refined OCC unbleached could also be suitable for use in tissue grades where high brightness is not an essential product feature.}, journal={Resources, Conservation and Recycling}, publisher={Elsevier BV}, author={Zambrano, Franklin and Marquez, Ronald and Jameel, Hasan and Venditti, Richard and Gonzalez, Ronalds}, year={2021}, month={Dec}, pages={105854} }
 @article{vera_salazar‐rodríguez_marquez_forgiarini_2020, title={How the Influence of Different Salts on Interfacial Properties of Surfactant–Oil–Water Systems at Optimum Formulation Matches the Hofmeister Series Ranking}, volume={23}, url={https://doi.org/10.1002/jsde.12406}, DOI={10.1002/jsde.12406}, abstractNote={AbstractIn this work, we present the effects of salts on sodium dodecyl benzene sulfonate micellization and on the interfacial performance of a sodium dodecyl benzene sulfonate–heptane–brine system at optimum formulation, i.e., hydrophilic–lipophilic deviation (HLD) = 0. In order to do that, interfacial tension and dilational interfacial rheology properties of surfactant–heptane–water systems at optimum formulation are measured using an interfacial spinning drop tensiometer with an oscillating velocity, which can accurately measure interfacial rheology properties at both low and ultralow interfacial tensions. The brines used contain one of the following salts: MgCl2, CaCl2, NaCl, NH4Cl, NaNO3, CH3COONa, or Na2SO4. We performed a one‐dimensional salinity scan with each of these salts to achieve an optimum formulation. In relation to the Hofmeister series, we found that, at optimum formulation, systems with chaotropic ions (NH4+, NO3−) present interfaces with ultralow interfacial tensions, very low dilational modulus, and a low phase angle, whereas kosmotropic ions (Mg2+, Ca2+, SO4−2) generate high interfacial tension and high rigidity monolayers. Intermediate ions in the Hofmeister series (Na+, CH3COO−, Cl−) present interfaces with intermediate properties. Furthermore, according to the Hofmeister series, interfaces can be respectively ordered from higher to lower rigidity for surfactant counterions Mg2+ > Ca2+ > Na+ > NH4+ and coions SO42− > CH3COO– > Cl− > NO3−, which correspond to a salting‐out (highest rigidity) and salting‐in (lowest rigidity) effect. We observed that counterions have a more significant effect on surfactant–oil–water system properties than those that act as coions.}, number={3}, journal={Journal of Surfactants and Detergents}, author={Vera, Ramon E. and Salazar‐Rodríguez, Franklin and Marquez, Ronald and Forgiarini, Ana M.}, year={2020}, month={May}, pages={603–615} }
 @article{salager_antón_bullón_forgiarini_marquez_2020, title={How to Use the Normalized Hydrophilic-Lipophilic Deviation (HLDN) Concept for the Formulation of Equilibrated and Emulsified Surfactant-Oil-Water Systems for Cosmetics and Pharmaceutical Products}, volume={7}, url={https://doi.org/10.3390/cosmetics7030057}, DOI={10.3390/cosmetics7030057}, abstractNote={The effects of surfactant molecules involved in macro-, mini-, nano-, and microemulsions used in cosmetics and pharmaceuticals are related to their amphiphilic interactions with oil and water phases. Basic ideas on their behavior when they are put together in a system have resulted in the energy balance concept labeled the hydrophilic-lipophilic deviation (HLD) from optimum formulation. This semiempirical equation integrates in a simple linear relationship the effects of six to eight variables including surfactant head and tail, sometimes a cosurfactant, oil-phase nature, aqueous-phase salinity, temperature, and pressure. This is undoubtedly much more efficient than the hydrophilic-lipophilic balance (HLB) which has been used since 1950. The new HLD is quite important because it allows researchers to model and somehow predict the phase behavior, the interfacial tension between oil and water phases, their solubilization in single-phase microemulsion, as well as the corresponding properties for various kinds of macroemulsions. However, the HLD correlation, which has been developed and used in petroleum applications, is sometimes difficult to apply accurately in real cases involving ionic–nonionic surfactant mixtures and natural polar oils, as it is the case in cosmetics and pharmaceuticals. This review shows the confusion resulting from the multiple definitions of HLD and of the surfactant parameter, and proposes a “normalized” Hydrophilic-Lipophilic Deviation (HLDN) equation with a surfactant contribution parameter (SCP), to handle more exactly the effects of formulation variables on the phase behavior and the micro/macroemulsion properties.}, number={3}, journal={Cosmetics}, publisher={MDPI AG}, author={Salager, Jean-Louis and Antón, Raquel and Bullón, Johnny and Forgiarini, Ana and Marquez, Ronald}, year={2020}, month={Jul}, pages={57} }
 @article{khatib_bullón_vivas_bahsas_rosales‐oballos_marquez_forgiarini_salager_2020, title={Synthesis, Characterization, Evaluation of Interfacial Properties and Antibacterial Activities of Dicarboxylate Anacardic Acid Derivatives from Cashew Nut Shell Liquid of Anacardium occidentale L.}, volume={23}, url={https://doi.org/10.1002/jsde.12384}, DOI={10.1002/jsde.12384}, abstractNote={AbstractAnacardic acid, 2‐hydroxy‐6‐[(8Z,11Z‐pentadeca‐8,11,14‐trienyl]‐benzoic acid, extracted from cashew nut shell liquid (CNSL), has been structurally modified to obtain the 2‐(O‐carboxymethyl)‐6‐[(8Z,11Z)‐pentadeca‐8,11,14‐trienyl]‐benzoic acid and its disodium carboxylate salt. Our separation method allows to easily obtain anacardic acid, which has been of interest for the fabrication of green products. These methods proposed for the first time to synthesize these derivatives are short and cheap, and with a high yield. The elucidation of its structure was carried out by means of infrared spectroscopy (IR) and nuclear magnetic resonance (NMR) techniques. Interfacial rheology properties of surfactant‐air‐water and surfactant‐heptane‐water systems were determined by using a new oscillating spinning drop rheometer apparatus. Physicochemical characterization was performed with a salinity scan in a surfactant‐heptane‐brine system, obtaining a value of the surfactant characteristic parameter σ = −4.3 for the disodium salt and a critical micellar concentration (cmc) of 0.08 wt%, showing high surface activity. The biological activity of both compounds was determined and measurements of their potential antimicrobial activity against Gram‐positive and Gram‐negative bacteria were performed, exhibiting high effectiveness, especially for the disodium salt against Gram‐positive bacteria.}, number={3}, journal={Journal of Surfactants and Detergents}, author={Khatib, Sonia Koteich and Bullón, Johnny and Vivas, Jesús and Bahsas, Ali and Rosales‐Oballos, Yolima and Marquez, Ronald and Forgiarini, Ana and Salager, Jean Louis}, year={2020}, month={May}, pages={503–512} }
 @article{marquez_forgiarini_langevin_salager_2019, title={Breaking of Water-In-Crude Oil Emulsions. Part 9. New Interfacial Rheology Characteristics Measured Using a Spinning Drop Rheometer at Optimum Formulation}, volume={33}, url={https://doi.org/10.1021/acs.energyfuels.9b01476}, DOI={10.1021/acs.energyfuels.9b01476}, abstractNote={Water–crude oil interfaces often exhibit a viscoelastic layer with a high mechanical resistance, consisting of natural surfactants in crude oil, mainly asphaltenes, which stabilize water-in-oil emu...}, number={9}, journal={Energy & Fuels}, publisher={American Chemical Society (ACS)}, author={Marquez, Ronald and Forgiarini, Ana M. and Langevin, Dominique and Salager, Jean-Louis}, year={2019}, month={Sep}, pages={8151–8164} }
 @article{salager_forgiarini_marquez_2019, title={Extended Surfactants Including an Alkoxylated Central Part Intermediate Producing a Gradual Polarity Transition—A Review of the Properties Used in Applications Such as Enhanced Oil Recovery and Polar Oil Solubilization in Microemulsions}, volume={22}, url={https://doi.org/10.1002/jsde.12331}, DOI={10.1002/jsde.12331}, abstractNote={AbstractThe research published in the past half century indicates that surfactant interfacial performance in producing low tension or high solubilization with polar oils is not generally attained with pure conventional species exhibiting well‐defined polar and nonpolar parts. The improvement trends reached with surfactant mixtures as well as the introduction of additives like cosurfactants and linkers lead to the introduction of the so‐called extended surfactants, whose structure includes an intermediate polarity spacer between the hydrophilic head and the lipophilic tail. Recent investigations on different kinds of surfactants in a variety of applications—such as detergency, cosmetics, enhanced oil recovery or crude demulsifying, and vegetable oil extraction—indicate that these extended surfactants are likely to be particularly performing with oils containing polar groups, such as triacylglycerols and asphaltenic crudes. Possible applications of extended surfactants in enhanced oil recovery, crude emulsion breaking, detergency and cleaning, medicine and cosmetics vehicles, and natural oil extraction as well as some other cases are quickly reviewed.}, number={5}, journal={Journal of Surfactants and Detergents}, author={Salager, Jean‐Louis and Forgiarini, Ana and Marquez, Ronald}, year={2019}, month={Sep}, pages={935–972} }
 @article{marquez_antón_vejar_salager_forgiarini_2019, title={New Interfacial Rheology Characteristics Measured Using a Spinning Drop Rheometer at the Optimum Formulation. Part 2. Surfactant–Oil–Water Systems with a High Volume of Middle‐Phase Microemulsion}, volume={22}, url={https://doi.org/10.1002/jsde.12245}, DOI={10.1002/jsde.12245}, abstractNote={AbstractThis article is a continuation of our first study on dilational interfacial rheology properties at optimum formulation for surfactant‐oil–water systems at low surfactant concentration just above the cμc. Here, we have investigated a high content of middle‐phase microemulsion with an optimum WIII phase behavior for a system containing sodium dodecyl sulfate, n‐pentanol, and kerosene. A new oscillating spinning drop interfacial rheometer was used to measure the interfacial properties. The very low dilational elasticity moduli and phase angle found at or near hydrophilic–lipophilic deviation (HLD) = 0 are related to the presence of the bicontinuous phase microemulsion and to the fast surfactant exchanges between the bulk and the interface, regardless of the phases involved in the measurement using the spinning drop apparatus, i.e., the two‐phase excess oil and excess water (O‐W) or the bicontinuous microemulsion and excess water (M‐W). We show that at or near optimum formulation, the interfacial tension and the dilational modulus for the M‐W case almost instantly reach equilibrium, because of the high surfactant content in the microemulsion and the fast exchanges between the bulk and the interface. In contrast, when both excess phases (O‐W) are measured, the changes in these properties are slower, due to the scarce presence of surfactants in both phases. The possibility of having almost all the surfactants trapped in the middle‐phase bicontinuous microemulsion could explain the emulsion instability in all the WIII range. This is behaving as if there were no surfactant available in the oil and water phases to stabilize the oil or water droplets thus formed.}, number={2}, journal={Journal of Surfactants and Detergents}, publisher={Wiley}, author={Marquez, Ronald and Antón, Raquel and Vejar, Francia and Salager, Jean‐Louis and Forgiarini, Ana M.}, year={2019}, month={Mar}, pages={177–188} }
 @article{technological use of beeswax for obtaining organic products, non-toxic for the human being_2019, url={https://publons.com/wos-op/publon/31271964/}, journal={Ciencia E Ingenieria}, year={2019} }
 @article{tolosa_marquez_rennola_sandia_bullon_2018, title={An overview of today's project-based learning and how it has been implemented in the Chemical Engineering School at Universidad de Los Andes}, url={https://doi.org/10.22201/fq.18708404e.2018.4.64701}, DOI={10.22201/fq.18708404e.2018.4.64701}, abstractNote={This paper builds on a project-based engineering learning strategy called RAIS ‘Reproducing an Innovation Environment in the Classroom’ applied in courses in the Chemical Engineering curriculum at the Universidad de Los Andes (ULA). It follows a previous investigation where the practical implementation of RAIS strategy is presented (Marquez et al., 2016), and in this occasion the theoretical fundamentals of the RAIS strategy are outlined. Authors take the common project-based learning to a new level by directly involving the students in the common start-up company practice where the final product to be formulated and manufactured is not a requirement from an external client but comes from real entrepreneurship students’ interests. In previous work it has been shown that this strategy allows interconnecting the course objectives with the development of a product. RAIS strategy has reported successful outcomes in the accomplishment of this goal for Chemical Engineering students at ULA.}, journal={Educación Química}, author={Tolosa, Laura and Marquez, Ronald and Rennola, Leonardo and Sandia, Beatriz and Bullon, Johnny}, year={2018}, month={Oct} }
 @article{marquez_forgiarini_langevin_salager_2018, title={Instability of Emulsions Made with Surfactant–Oil–Water Systems at Optimum Formulation with Ultralow Interfacial Tension}, volume={34}, url={https://publons.com/wos-op/publon/12793334/}, DOI={10.1021/acs.langmuir.8b01376}, abstractNote={We have studied emulsions made with two- and three-phase oil-water-surfactant systems in which one of the phases is a microemulsion, the other phases being water or/and oil excess phases. Such systems have been extensively studied in the 1970-1980s for applications in enhanced oil recovery. It was found at that time that the emulsions became very unstable in the three-phase systems, but so far few explanations have been proposed. In the most complete one, Kabalnov and colleagues related the emulsion stability to the probability of hole nucleation in the liquid film separating two nearby emulsion drops and associated this probability to the curvature elastic energy of the surfactant layer covering drop surfaces. We propose a different explanation, linked to another type of interfacial elastic energy, associated with compression of the surfactant layers. As found long ago, the three-phase systems are found near optimum formulation (hydrophile lipophile difference, HLD = 0), where the interfacial tension exhibits a deep minimum. The determination of interfacial elastic properties in low interfacial tension systems is not straightforward. In our present work, we used a spinning drop tensiometer with an oscillating rotation velocity. We show that the interfacial compression elastic modulus and viscosity also exhibit a minimum at optimum formulation. We propose that this minimum is related to the acceleration of the surfactant exchanges between the interface, oil and water, near the optimum formulation. Furthermore, we find that the surfactant partitions close to equally between oil and water at the optimum, as in earlier studies. The interfacial tension gradients that slow the thinning of liquid films between drops are reduced by surfactant exchanges between drops and the interface, which are fast whatever the type of drop, oil or water; film thinning is therefore very rapid, and emulsions are almost as unstable as in the absence of surfactant.}, number={31}, journal={Langmuir}, publisher={American Chemical Society (ACS)}, author={Marquez, Ronald and Forgiarini, Ana M. and Langevin, Dominique and Salager, Jean-Louis}, year={2018}, month={Jul}, pages={9252–9263} }
 @article{zamora_marquez_forgiarini_langevin_salager_2018, title={Interfacial rheology of low interfacial tension systems using a new oscillating spinning drop method}, volume={519}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85042353425&partnerID=MN8TOARS}, DOI={10.1016/j.jcis.2018.02.015}, abstractNote={When surfactants adsorb at liquid interfaces, they not only decrease the surface tension, they confer rheological properties to the interfaces. There are two types of rheological parameters associated to interfacial layers: compression and shear. The elastic response is described by a storage modulus and the dissipation by a loss modulus or equivalently a surface viscosity. Various types of instruments are available for the measurements of these coefficients, the most common being oscillating pendent drops instruments and rheometers equipped with bicones. These instruments are applicable to systems with large enough interfacial tensions, typically above a few mN/m. We use a new type of instrument based on spinning drop oscillations, allowing to extend the interfacial rheology studies to low and ultralow interfacial tension systems. We present examples of measurements with systems of high and low tension, discuss the possible artifacts and demonstrate the capability of this new technique. We emphasize that the data shown for low interfacial tensions are the first reported in the literature. The instrument is potentially interesting for instance in enhanced oil recovery or demulsification studies.}, journal={Journal of Colloid and Interface Science}, publisher={Elsevier BV}, author={Zamora, José M. and Marquez, Ronald and Forgiarini, Ana M. and Langevin, Dominique and Salager, Jean-Louis}, year={2018}, pages={27–37} }
 @article{marquez_forgiarini_fernández_langevin_salager_2018, title={New Interfacial Rheology Characteristics Measured using a Spinning-Drop Rheometer at the Optimum Formulation of a Simple Surfactant-Oil-Water System}, volume={21}, url={https://publons.com/wos-op/publon/12793335/}, DOI={10.1002/jsde.12163}, abstractNote={AbstractA new spinning‐drop tensiometer with an oscillating rotation velocity was used to measure the interfacial rheological properties of systems with very low interfacial tensions in the zone close to the so‐called optimum formulation of surfactant–oil–water systems. 2 simple formulation scans were selected: One with an extended anionic surfactant using a salinity variation in the water phase, and another with a mixture of 2 nonionic surfactants in a scan produced by changing their proportion. With both systems it was corroborated that at optimum formulation (i.e., at hydrophilic–lipophilic deviation (HLD) = 0), both the interfacial tension and the emulsion stability exhibit a deep minimum. A clear relationship was also found between the phase behavior and the interfacial rheological properties (dilational elasticity and viscosity). For the very first time and in both kinds of scans (salinity or average ethylene oxide number), it was found that the interfacial elastic modulus E and the interfacial viscosity, as well as the phase angle also exhibit a minimum at optimum formulation. These groundbreaking findings could be applied to emulsion instability at optimum formulation and to its applications in emulsion breaking.}, number={5}, journal={Journal of Surfactants and Detergents}, publisher={Wiley}, author={Marquez, Ronald and Forgiarini, Ana M. and Fernández, Jesús and Langevin, Dominique and Salager, Jean-Louis}, year={2018}, month={Jun}, pages={611–623} }
 @inproceedings{obtaining products in chemical engineering through reproducing an environment of innovation in the classroom_2017, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85034229541&partnerID=MN8TOARS}, booktitle={2017 Research in Engineering Education Symposium, REES 2017}, year={2017} }
 @article{dual formulation effect produced by a high content in alcohol in oil/sodium dodecyl sulfate/pentanol/water systems and resulting shift in oil eacn_2016, url={https://publons.com/wos-op/publon/12793337/}, journal={Ciencia E Ingenieria}, year={2016} }
 @article{reproducing an innovation environment in the classroom. an strategy to promote creativity in chemical engineering education,reproducción de un ambiente de innovación en el salón de clase. una estrategia para promover la creatividad en la educación en ingeniería química_2016, volume={27}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84991737662&partnerID=MN8TOARS}, DOI={10.1016/j.eq.2016.07.001}, abstractNote={El proceso enseñanza-aprendizaje en la educación universitaria tradicional utiliza estrategias que colocan al estudiante como un receptor de información transmitida por el profesor, la cual es conceptualizada como conocimiento. La realidad en que vivimos requiere generar soluciones de formación que permitan satisfacer las necesidades de los individuos en el desarrollo de competencias o saber-hacer, para dar respuestas a la sociedad, para formar individuos capaces de aprender a aprender y aprender a transferir, preparados para buscar continuamente el conocimiento y capacitados para crear e innovar. En este trabajo se presentan los resultados de la aplicación de la estrategia «Reproducción de un Ambiente de Innovación en el Salón de clase» (RAIS) en asignaturas del currículo de Ingeniería Química, de la Universidad de los Andes, Mérida-Venezuela. Esta es una estrategia de enseñanza-aprendizaje y evaluación donde el estudiante es copartícipe de la construcción y generación del conocimiento, desarrollando las competencias propuestas en la asignatura a través de la ejecución de un producto. La estrategia RAIS fue aplicada en las asignaturas Fisicoquímica para Ingenieros Químicos, Química Industrial I y Laboratorio de Química Industrial, donde los estudiantes obtuvieron con éxito un producto, utilizando el saber-hacer en el área de cada curso. Esta estrategia generó un incremento en la motivación con respecto a otros cursos basados en clases magistrales, y el desarrollo de la capacidad de desenvolverse y encontrar soluciones en ambientes de trabajo con grupos multidisciplinarios. Es importante resaltar que más de un 80% de los estudiantes indicó que la estrategia RAIS contribuye a su desarrollo personal y formación para realizar investigación aplicada.}, number={4}, journal={Educacion Quimica}, year={2016}, pages={249–256} }
 @article{rheological changes of parenteral emulsions during phase-inversion emulsification_2008, volume={29}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-41849151112&partnerID=MN8TOARS}, DOI={10.1080/01932690801945998}, abstractNote={An efficient emulsification procedure for parenteral soybean oil‐in‐water, based on current know‐how on transitional inversion, was investigated. A fine droplet size lipid emulsion was produced using much lower mechanical energy than the typical industrial process. The aqueous phase was added gradually during mixing and various rates of water addition, as well as surfactant concentration, were evaluated. It was found that as addition rate and surfactant content increased, flow behavior changed significantly at intermediate water content, becoming highly viscoelastic. This behavior was related to the formation of a liquid crystalline phase that, at later mixing stages, turned into small droplets.}, number={4}, journal={Journal of Dispersion Science and Technology}, year={2008}, pages={621–627} }
 @article{nano-emulsification of triglyceride oils for parenteral use by mean of a low-energy emulsification method_2007, url={https://publons.com/wos-op/publon/12793339/}, journal={Revista Tecnica de la Facultad de Ingenieria Universidad del Zulia}, year={2007} }