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Modulation of Cellulose Nanocrystals Amphiphilic Properties to Stabilize Oil Water Interface

Abstract : Neutral cellulose nanocrystals dispersed in water were shown in a previous work to stabilize oil/water interfaces and produce Pickering emulsions with outstanding stability, whereas sulfated nanocrystals obtained from cotton did not show interfacial properties. To develop a better understanding of the stabilization mechanism, amphiphilic properties of the nanocrystals were modulated by tuning the surface charge density to investigate emulsifying capability on two sources of cellulose: cotton linters (CCN) and bacterial cellulose (BCN). This charge adjustment made it possible to determine the conditions where a low surface charge density, below 0.03 e/nm(2), remains compatible with emulsification, as well as when assisted by charge screening regardless of the source. This study discusses this ability to stabilize oil-in-water emulsions for cellulose nanocrystals varying in crystalline allomorph, morphology, and hydrolysis processes related to the amphiphilic character of nonh! ydrophobized cellulose nanocrystal.
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Submitted on : Friday, May 29, 2020 - 7:56:31 PM
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Irina Kalashnikova, Herve Bizot, Bernard Cathala, Isabelle Capron. Modulation of Cellulose Nanocrystals Amphiphilic Properties to Stabilize Oil Water Interface. Biomacromolecules, American Chemical Society, 2012, 13 (1), pp.267-275. ⟨10.1021/bm201599j⟩. ⟨hal-02652665⟩

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