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There is currently a renewed interest for improving household and personalcare formulations to provide more environment friendly products. Fabricconditioners used as softeners have to fulfill a number of stability andbiodegradability requirements. They should also display significant adsorptionon cotton in the conditions of use. The quantification of surfactant adsorptionremains however difficult because the fabric woven structure is complex anddeposited amounts are generally small. Here we propose a method to evaluatecellulose/sur-factant interactions with increased detection sensitivity. Themethod is based on the use of cellulose nanocrystals in lieu of micron-sizedfibers or yarns, combined with different techni-ques including lightscattering, optical and electron microscopy, and electrophoretic mobili-ty.Cellulose nanocrystals are rod-shaped nano-particles in the form of 200 nmlaths that are negatively charged and can be dispersed in bulk solutions. Inthis work, we use a double-tailed cationic surfactant present in fabricsoftener. Results show that the surfactants self-assemble into unilamellar,multivesicular and multilamellar vesicles, and interaction with cellulosenanocrys-tals is driven by electrostatics. Mutual interac-tions are strong andlead to the formation of large-scale aggregates, where the vesicles remainintact at the cellulose surface. The technique developed here could beexploited to rapidly assess fabric conditioner efficiency obtained by varyingthe nature and content of their chemical additives.

Fabric Softener/Cellulose Nanocrystal Interaction: A Model For Assessing Surfactant Deposition On Cotton