@article{li_liu_song_rojas_hinestroza_2011, title={Adsorption and Association of a Symmetric PEO-PPO-PEO Triblock Copolymer on Polypropylene, Polyethylene, and Cellulose Surfaces}, volume={3}, ISSN={["1944-8244"]}, DOI={10.1021/am200264r}, abstractNote={The association of a symmetric polyoxyethylene-polyoxypropylene-polyoxyethylene (PEO(19)-PPO(29)-PEO(19)) triblock copolymer adsorbed from aqueous solutions onto polypropylene (PP), polyethylene (PE), and cellulose surfaces was probed using Atomic Force Microscopy (AFM). Significant morphological differences between the polyolefin substrates (PP and PE) and the cellulose surfaces were observed after immersion of the films in the PEO(19)-PPO(29)-PEO(19) solutions. When the samples were scanned, while immersed in solutions of the triblock copolymer, it was revealed that the structures adsorbed on the polyolefin surfaces were smoothed by the adsorbed PEO(19)-PPO(29)-PEO(19). In contrast, those structures on the hydrophilic cellulose surfaces were sharpened. These observations were related to the roughness of the substrate and the energy of interaction between the surfaces and the PEO and PPO polymer segments. The interaction energy between each of the blocks and the surface was calculated using molecular dynamics simulations. It is speculated that the associative structures amply reported in aqueous solution at concentrations above the critical micelle concentration, CMC, are not necessarily preserved upon adsorption; instead, it appears that molecular arrangements of the anchor-buoy type and hemimicelles prevail. The reported data suggests that the roughness of the surface, as well as its degree of hydrophobicity, have a large influence on the nature of the resulting adsorbed layer. The reported observations are valuable in explaining the behavior of finishing additives and lubricants commonly used in textile and fiber processing, as well as the effect of the morphology of the boundary layers on friction and wear, especially in the case of symmetric triblock copolymers, which are commonly used as antifriction, antiwear additives.}, number={7}, journal={ACS APPLIED MATERIALS & INTERFACES}, author={Li, Yan and Liu, Hongyi and Song, Junlong and Rojas, Orlando J. and Hinestroza, Juan P.}, year={2011}, month={Jul}, pages={2349–2357} }
 @article{kim_hinestroza_jasper_barker_2011, title={Application of Electrostatic Force Microscopy on Characterizing an Electret Fiber: Effect of Tip to Specimen Distance on Phase Shift}, volume={12}, ISSN={["1229-9197"]}, DOI={10.1007/s12221-011-0089-1}, number={1}, journal={FIBERS AND POLYMERS}, publisher={Springer Nature}, author={Kim, J. and Hinestroza, J. P. and Jasper, W. and Barker, R. L.}, year={2011}, month={Feb}, pages={89–94} }
 @article{kim_hinestroza_jasper_barker_2009, title={Effect of Solvent Exposure on the Filtration Performance of Electrostatically Charged Polypropylene Filter Media}, volume={79}, ISSN={["1746-7748"]}, DOI={10.1177/0040517508090887}, abstractNote={Solvent-induced performance deterioration in corona charged polypropylene electret filter media was studied. Electret media, exposed to isopropanol (IPA) in the liquid phase, exhibited reduced filtration efficiency with negligible changes in the pressure drop across the media. Scanning electron microscopy imaging indicated no observable morphological changes after IPA exposure. Solvent-induced efficiency deterioration of electret filter media was hypothesized to originate from charge deterioration rather than charge masking. The charge of the individual fibers in filter media was characterized using electrostatic force microscopy (EFM). EFM investigation produced evidence that exposure to IPA in the liquid phase affected the electrostatic charges on fibers. Exposure to organic solvents such as xylene, toluene, and ethyl benzene has been reported to increase charge mobility in polypropylene fibers, thereby reducing the electrostatic charge and the ability of the fibers in the electret filter media to capture particulates.}, number={4}, journal={TEXTILE RESEARCH JOURNAL}, publisher={SAGE Publications}, author={Kim, Jooyoun and Hinestroza, Juan P. and Jasper, Warren and Barker, R. L.}, year={2009}, month={Mar}, pages={343–350} }
 @inbook{song_li_hinestroza_rojas_2009, title={Tools to probe nanoscale surface phenomena in cellulose thin films: Applications in the area of adsorption and friction}, ISBN={9781405167864}, DOI={10.1002/9781444307474.ch4}, abstractNote={Surfaces and interfaces play important roles in defining material interactions. Several developments in science and technology highlight the importance of interfaces in applications involving material functionalization, coatings, colloids stability, etc. (Karim and Kumar 2000). In many cases, the interfacial properties are more relevant than the nature and composition of the bulk phases and ultimately define the molecular behavior of the system. The ‘thickness’ of a boundary between two phases, if possible to define, is expected to be extremely narrow. The interface between (bio)polymers or that for a polymer-coated substrate and the surrounding medium typically entails a ‘soft’ layer with molecular or nanoscale dimensions. The use of adsorbed polymers and surfactants to modify solid surfaces offers unique possibilities to alter or regulate their properties, including surface energy, molecular assembly and composition, among others. In order to effectively or permanently modify the interfacial properties the adsorbing material (or adsorbate) has to bind to some degree or extent to the respective surface. Therefore, adsorption is fundamental in many important applications, particularly in the general fields of adhesion, colloidal stabilization, friction, and heterogeneous reactions.}, booktitle={The nanoscience and technology of renewable biomaterials}, publisher={Chichester, West Sussex, U.K.: Wiley-Blackwell}, author={Song, S. and Li, Y. and Hinestroza, J. P. and Rojas, O. J.}, editor={Lucia, L. A. and Rojas, O. J.Editors}, year={2009} }
 @article{talwar_hinestroza_pourdeyhimi_khan_2008, title={Associative polymer facilitated electrospinning of nanofibers}, volume={41}, ISSN={["1520-5835"]}, DOI={10.1021/ma8004795}, abstractNote={Electrospun nanofibers present an exciting avenue for development of novel materials with well-defined functionalities; however, broadening the scope of electrospinning to a diverse range of polymers remains a major challenge. In particular, a recurring issue in this field is the inability to spin polymers at lower concentrations in order to achieve smaller fiber diameters. This work explores the use of associative polymers as a means to overcome this limiting factor that prevents the electrospinnning of nanofibers from low-concentration polymer solutions. Hydrophobically modified alkali-soluble emulsion (HASE) polymers are comblike associative polymers with pendant hydrophobes that form a network in aqueous media consisting of both intra- and intermolecular hydrophobic junctions. Rheological measurements reveal that addition of HASE polymers in small amounts to poly(ethylene oxide) solutions leads to considerable increase in viscosity as well as dynamic moduli of the system. More importantly, these rheol...}, number={12}, journal={MACROMOLECULES}, author={Talwar, Sachin and Hinestroza, Juan and Pourdeyhimi, Benham and Khan, Saad A.}, year={2008}, month={Jun}, pages={4275–4283} }
 @article{jasper_mohan_hinestroza_barker_2007, title={Degradation processes in corona-charged electret filter-media with exposure to Ethyl Benzene}, volume={2}, number={4}, journal={Journal of Engineered Fibers and Fabrics}, author={Jasper, W. J. and Mohan, A. and Hinestroza, J. and Barker, R.}, year={2007}, pages={19–24} }
 @article{jasper_mohan_hinestroza_barger_2007, title={Degredation processes in corona-charged electret filter-media with exposure to ethyl benzene}, volume={2}, number={4}, journal={Journal of Engineered Fibers and Fabrics}, author={Jasper, W. J and Mohan, A. and Hinestroza, J. and Barger, R.}, year={2007}, pages={19–24} }
 @article{kim_jasper_hinestroza_2007, title={Direct probing of solvent-induced charge degradation in polypropylene electret fibres via electrostatic force microscopy}, volume={225}, ISSN={["1365-2818"]}, DOI={10.1111/j.1365-2818.2007.01716.x}, abstractNote={Summary}, number={1}, journal={JOURNAL OF MICROSCOPY}, publisher={Wiley}, author={Kim, J. and Jasper, W. and Hinestroza, J.}, year={2007}, month={Jan}, pages={72–79} }
 @article{hyde_dong_hinestroza_2007, title={Effect of surface cationization on the conformal deposition of polyelectrolytes over cotton fibers}, volume={14}, ISSN={["1572-882X"]}, DOI={10.1007/s10570-007-9126-z}, number={6}, journal={CELLULOSE}, author={Hyde, Kevin and Dong, Hong and Hinestroza, Juan P.}, year={2007}, month={Dec}, pages={615–623} }
 @article{kim_jasper_hinestroza_2006, title={Charge characterization of an electrically charged fibre via electrostatic force microscopy}, volume={1}, number={2}, journal={Journal of Engineered Fibers and Fabrics}, author={Kim, J. and Jasper, W. J. and Hinestroza, J.}, year={2006} }
 @article{jasper_hinestroza_mohan_kim_shiels_gunay_thompson_barker_2006, title={Effect of xylene exposure on the performance of electret filter media}, volume={37}, ISSN={["0021-8502"]}, DOI={10.1016/j.jaerosci.2005.06.008}, abstractNote={Performance degradation of electret filter media when exposed to xylene was investigated using a custom-made exposure apparatus. Three types of electret filter media were exposed to xylene in liquid and gas phases. Experimental data indicated that the penetration percentage of di-octyl-phtalate (DOP) aerosols through electret filter media was not influenced by exposure to xylene vapors for periods up to 8 h. The filtration performance for all three types of electret filter media decreased over 30% when the samples were exposed to liquid xylene. Pressure drop changes of the filter media prior and after exposure to liquid xylene were statistically negligible. Neither morphological changes nor degradation of the polymer fibers were observed after exposure of the filter media samples to liquid xylene. Thermodynamic simulations were performed to determine the molar flux of liquid and gas phases through the filter media specimens. Experimental results obtained via capillary gas chromatography were within 4% of the predicted values. The decrease in performance was attributed to changes in the density and spatial distribution of the electret charges on the surface of the polymer fibers.}, number={7}, journal={JOURNAL OF AEROSOL SCIENCE}, publisher={Elsevier BV}, author={Jasper, W. and Hinestroza, J. and Mohan, A. and Kim, J. and Shiels, B. and Gunay, M. and Thompson, D. and Barker, R.}, year={2006}, month={Jul}, pages={903–911} }
 @article{hyde_rusa_hinestroza_2005, title={Layer-by-layer deposition of polyelectrolyte nanlayers on natural fibres: cotton}, volume={16}, ISSN={["1361-6528"]}, DOI={10.1088/0957-4484/16/7/017}, abstractNote={The layer-by-layer (LbL) deposition of poly(sodium 4-styrene sulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) over cotton fibres is reported. Cotton fibres offer unique challenges to the deposition of nanolayers because of their unique cross section as well as the chemical heterogeneity of their surface. Cationic cotton substrates were produced by using 2,3-epoxypropyltrimethylammonium chloride. Attenuated total reflectance FTIR, x-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) were used to validate the presence of the nanolayers as well as to corroborate their self-organized structure. TEM images indicated conformal and uniform coating of the cotton fibres. XPS spectral data were found to be in quantitative agreement with previous published work that studied the LbL deposition of PSS and PAH over synthetic substrates.}, number={7}, journal={NANOTECHNOLOGY}, author={Hyde, K and Rusa, M and Hinestroza, J}, year={2005}, month={Jul}, pages={S422–S428} }
 @article{hinestroza_de kee_2004, title={Permeation of organics through linear low density polyethylene geomembranes under mechanical deformation}, volume={130}, DOI={10.1061/(asce)0733-9372(2004)130:12(1468)}, abstractNote={The effect of mechanical deformation on the permeation of methylene chloride (MEC), trichloroethylene (TCE) as well as mixtures thereof through linear low-density polyethylene (LLDPE) geomembranes was studied using a new experimental technique. A total of fifty experimental conditions involving five different deformations, five different concentrations and two types of LLDPE geomembranes were evaluated following a full factorial experimental design. Mixtures of TCE and MEC (0.66, 0.50, and 0.34 volumetric fraction) were tested through geomembranes elongated uniaxially (10% and 20%) as well as in the biaxial mode (10% × 10% and 20% × 20%). The breakthrough times for the permeation of TCE and MEC decreased with elongation for both types of geomembranes. A reduction in breakthrough times between 38 and 45% was observed for the permeation of MEC and TCE though geomembranes elongated 20% × 20% in the biaxial mode compared to the nonelongated specimens. Evidence of stress-enhanced transport was also observed as the steady-state permeation rates of MEC increased between 200 and 300% where geomembranes were elongated 20% × 20% in the biaxial mode compared to the nonelongated samples. Enhanced transport of MEC was also noted during the permeation of the MEC–TCE mixtures.}, number={12}, journal={Journal of Environmental Engineering (New York, N.Y.)}, author={Hinestroza, J. and De Kee, D.}, year={2004}, pages={1468–1474} }