@article{li_danladi_vallabh_yakubu_ishiaku_theyson_seyam_2021, title={Cellulose Microfibril and Micronized Rubber Modified Asphalt Binder}, volume={9}, ISSN={["2079-6439"]}, DOI={10.3390/fib9040025}, abstractNote={Cellulose microfibrils (CMFs) and micronized rubber powder (MRP) can be derived from low or negative-cost agricultural/industrial waste streams and offer environment-friendly and cost-effective pathways to develop engineering products. This study investigated the efficacy of adding these micromodifiers on the performance characteristics of asphalt binders. In this work, samples were produced using a mixture of slow-setting anionic asphalt emulsion with various combinations of MRP (at 0, 2 and 10 wt %) and four types of CMFs (hydrophobic and hydrophilic with crystalline ratios of 86% and 95%) at 0, 2 and 5 wt %. The performance of modified asphalt samples was assessed by penetration depth (PD), softening point (SP), and penetration index (PI). Linear regression analysis showed that adding CMFs and/or MRP reduced PD and increased SP values. The type of CMFs significantly affected the performance, which becomes more distinct with the increased weight content of CMFs. While hydrophilic CMFs caused increases in SP and PI values, no clear trend was seen to determine the effect of CMF crystallinity. It was also discovered that the combined addition of CMF and MRP achieved similar PI values at lower total weight content compared to using MRP alone.}, number={4}, journal={FIBERS}, author={Li, Ang and Danladi, Abdu A. and Vallabh, Rahul and Yakubu, Mohammed K. and Ishiaku, Umar and Theyson, Thomas and Seyam, Abdel-Fattah M.}, year={2021}, month={Apr} }
 @article{seyam_jasti_oxenham_theyson_2020, title={The role of hydrophilic finishes in frictional electrification and charge decay of woven fabric from polyester}, volume={111}, ISSN={["1754-2340"]}, DOI={10.1080/00405000.2019.1626611}, abstractNote={Abstract The effect of different concentrations of Hydroperm T (a hydrophilic surface finishes) on the electrostatic charging and decay properties of filament polyester fabrics, has been investigated. The fabric was subjected to frictional charging with steel and PTFE (Teflon®) and the electrostatic properties were investigated. The technique adopted not only measured the charge in the location of the tribocharging, but was also able to assess the distribution and dissipation of the charge across the surface of the fabric. While the charge decay for the untreated fabric was slow and linear, a double exponential charge decay was observed on the samples treated with Hydroperm® T finish. The charge generated on the fabric treated with higher concentration (0.5%) Hydroperm® T finish decayed very quickly when compared to the other samples. Resistivity measurements indicate that the Hydroperm® T treated samples have lower resistivity when compared with the untreated samples.}, number={1}, journal={JOURNAL OF THE TEXTILE INSTITUTE}, author={Seyam, Abdel-Fattah M. and Jasti, Vamsi Krishna and Oxenham, William and Theyson, Thomas}, year={2020}, month={Jan}, pages={1–9} }
 @article{jasti_seyam_oxenham_theyson_2019, title={A novel approach to investigating frictional electrification and charge decay on woven textile fabrics treated with ionic antistatic and hydrophilic surface finishes}, volume={110}, ISSN={["1754-2340"]}, DOI={10.1080/00405000.2018.1507703}, abstractNote={Abstract The results of a study of charge generation and decay for range of woven fabrics from ring spun cotton yarns, ring spun polyester yarns, and flat continuous filament polyester yarns treated with topical finishes are reported. The topical finishes include commercially available ionic antistatic finishes, one commercially available hydrophilic finish, and a new experimental moisture management finish. The fabrics were rubbed against surface of steel and Polytetrafluoroethylene (PTFE; Teflon®) and their frictional electrification and charge dissipation were monitored. It is shown that fabrics from cotton have a more rapid inherent charge decay than fabrics from polyester. Ionic antistatic finishes are shown to be effective in reducing charge generation and promoting charge decay and this is particularly true for the fabrics made from filament polyester. When commercially available and experimental hydrophilic finishes were applied on fabrics made from filament polyester, less charge was generated and the generated charge decayed quickly compared to the control untreated fabrics. In an attempt to understand the mechanism of charge decay, two probes were used with one placed on the top of the rubbed area and the other placed some distance from the rubbed area. It was found that the generated charge migrated from the rubbed areas to other parts of the sample. This behavior is more pronounced for fabrics treated with hydrophilic and moisture management finishes, which cause the charge to decay exponentially.}, number={3}, journal={JOURNAL OF THE TEXTILE INSTITUTE}, author={Jasti, Vamsi K. and Seyam, Abdel-Fattah M. and Oxenham, William and Theyson, Thomas}, year={2019}, month={Mar}, pages={338–348} }
 @article{liu_theyson_oxenham_seyam_2012, title={Electrification of antistatic-treated polymeric surface}, volume={103}, ISSN={["0040-5000"]}, DOI={10.1080/00405000.2011.564798}, abstractNote={Nylon and polypropylene surfaces were treated with three different finishes (nonionic, cationic, and anionic) at four different solution concentrations (weight percentage of active finish to solution), 0.025%, 0.05%, 0.075%, and 0.1%. Contact electrification tests showed that charge accumulated on polypropylene decreased as the concentration of nonionic and anionic solutions increased, and charge could be controlled when the concentration reached 0.1%. The same effect was realized when the concentration of the cationic solution was only 0.025%. No contact charging was observed on nylon after treating with any solutions. Rubbing electrification (tribo‐charging) of nylon treated with the nonionic solution showed that charge decreased as the solution concentration increased, and no charge was observed as the solution concentration reached 0.1%. Furthermore, no tribo‐charging of nylon was observed at any level of the cationic or anionic agents applied to the surface.}, number={2}, journal={JOURNAL OF THE TEXTILE INSTITUTE}, author={Liu, L. and Theyson, T. and Oxenham, W. and Seyam, A. M.}, year={2012}, pages={215–224} }
 @article{liu_oxenham_seyam_theyson_2011, title={Effect of relative rubbing speed on the tribo-electrification of continuous filament yarn by stainless steel pins}, volume={102}, ISSN={["1754-2340"]}, DOI={10.1080/00405000.2010.536390}, abstractNote={The effect of relative rubbing speed on the tribo‐electrification between different continuous filament yarns and stainless steel “charging pins” was analysed. A modified linear tester, housed in an environmental room, was used to charge the yarn while transporting at desired speed and input tension. The yarn was rubbed against the charging pin, which was also rotated at different speeds. The yarn surface charge, yarn output tension and charging pin’s vibration were monitored in real time automatically. The results showed that for nylon yarn charge was minimized when the yarn/pin relative speed approached zero, regardless of the absolute rubbing speeds of yarn and pin. It was also found that, at the same relative speed, less charge was generated when a larger pin was used. For finish‐free nylon yarn, the charge was also minimized as the relative speed approaches zero; however, for finish‐free polyester yarn and finish‐free polypropylene yarn, the effect of relative rubbing speed on the electrification was not very significant.}, number={12}, journal={JOURNAL OF THE TEXTILE INSTITUTE}, author={Liu, Lu and Oxenham, William and Seyam, Abdelfattah M. and Theyson, Thomas}, year={2011}, pages={1075–1085} }
 @article{liu_wu_turgman-cohen_genzer_theyson_rojas_2010, title={Adsorption of a Nonionic Symmetric Triblock Copolymer on Surfaces with Different Hydrophobicity}, volume={26}, ISSN={["0743-7463"]}, DOI={10.1021/la100156a}, abstractNote={This study investigates the adsorption of a symmetric triblock nonionic polymer comprising ethylene oxide (EO) and propylene oxide (PO) blocks (Pluronic P-105, EO(37)PO(56)EO(37)) on a range of substrates including hydrophobic, i.e., polypropylene (PP), poly(ethylene terephthalate) (PET), nylon, and graphite, and hydrophilic, i.e., cellulose and silica. The adsorption process and the structure of the hydrated adsorbed layers are followed by quartz crystal microgravimetry (QCM), surface plasmon resonance (SPR), and atomic force microscopy. The unhydrated surfaces are characterized by ellipsometry and contact angle techniques. The adsorption kinetics and the extent of adsorption are determined by monitoring the changes in resonance frequency and refractive index of sensors coated with ultrathin films of the various substrates. Langmuirian-type adsorption kinetics is observed in all cases studied. The amount of adsorbed Pluronic on hydrophobic polymer surfaces (PP, PET, and nylon) exceeds that on the hydrophilic cellulose. The hydrophobic (graphite) mineral surface adsorbs relatively low polymer mass, typical of a monolayer, while micellar structures are observed on the hydrophilic silica surface. The amount of water coupled to the adsorbed polymer layers is quantified by combining data from QCM, and SPR are found to increase with increasing polarity of the substrate. On the basis of contact angle data, the nonhydrated adsorbed structures produce modest increases in hydrophilicity of all the substrates investigated. Overall, insights are provided into the structure and stability of both hydrated and nonhydrated adsorbed triblock copolymer.}, number={12}, journal={LANGMUIR}, author={Liu, Xiaomeng and Wu, Dong and Turgman-Cohen, Salomon and Genzer, Jan and Theyson, Thomas W. and Rojas, Orlando J.}, year={2010}, month={Jun}, pages={9565–9574} }