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    Adsorption of a fabric conditioner on cellulose nanocrystals: synergistic effects of surfactant vesicles and polysaccharides on softness properties

    Year: 2021

    Journal: Cellulose, Volume 28, MAR, page 2551–2566

    Authors: Oikonomou, Evdokia K.; Messina, Grazia M. L.; Heux, Laurent; Marletta, Giovanni; Berret, Jean-Francois

    Organizations: CSGI; ANR (Agence Nationale de la Recherche); CGI (Commissariat a l'Investissement d'Avenir) through Labex SEAM (Science and Engineering for Advanced Materials and devices) [ANR 11 LABX 086, ANR 11 IDEX 05 02]; French National Research Agency [ANR-10-INSB-04]; Agence Nationale de la Recherche [ANR-13-BS08-0015, ANR-12-CHEX-0011, ANR-15-CE18-0024-01, ANR-17-CE09-0017]; Solvay

    Keywords: Fabric conditioner; Double-tailed surfactant vesicles; Guar polysaccharide; Cellulose nanocrystals; Atomic force microscopy; Quartz crystal microbalance with dissipation monitoring

    Concentrated fabric conditioners are water-based formulations containing 10 wt% of cationic surfactants that are deposited on textile fibers during the rinse cycle in a washing machine to make them smoother and softer to touch. In topical formulations, the concentration of cationic surfactants is reduced by half, this reduction being compensated by the addition of environment-friendly polysaccharides. Using atomic force microscopy, quartz crystal microbalance with dissipation monitoring (QCM-D) and ellipsometry, the deposition of formulations with or without polysaccharides on model cellulose substrates is studied. We found that 180 nm long cellulose nanocrystals (CNCs) deposited by spin-coating on amorphous silicon dioxide onto quartz crystal sensors provide a good model of cellulose surfaces. QCM-D results reveal strong electrostatic interactions of the surfactant vesicles and polysaccharides with the CNC layer. In the presence of polysaccharides, the adsorbed quantities are less (by 60%) than the sum of the respective amounts of each component, the structure of the interface being however more homogenous and rigid. This outcome suggests that surface techniques coupled with CNC coated substrates are promising for studying interactions of current formulations with cellulose surfaces. Graphic abstract
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