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CO2-switchable dispersion of a natural chitosan and its application as a responsive pickering emulsifier

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Abstract The natural chitosan aggregates obtained by increasing the pH of aqueous solutions are found to be responsive to CO2/N2 switching. These chitosan aggregates can be dispersed in water upon… Click to show full abstract

Abstract The natural chitosan aggregates obtained by increasing the pH of aqueous solutions are found to be responsive to CO2/N2 switching. These chitosan aggregates can be dispersed in water upon CO2 bubbling and precipitated out with N2 bubbling at room temperature. Liquid paraffin-in-water Pickering emulsions are prepared using these aggregates as the stabilizer. These emulsions can be demulsified completely with CO2 bubbling, and the separated two phases can be re-emulsified with N2 bubbling under mechanical mixing. This CO2/N2-switched demulsification/re-emulsification cycle can be repeated several times. The CO2/N2-switched dispersion/aggregation of the chitosan aggregates leads to desorption/adsorption of the aggregates at the oil/water interface and hence the disappearance/reconstruction of the three-dimensional network structure of the aggregates, which is responsible for the demulsification/re-emulsification. Experimental evidence including the measurement of interfacial tension, interfacial dilatational elastic modulus and rheological properties, and micrographs of formed emulsions is given to support the proposed stabilization mechanism.

Keywords: switchable dispersion; co2 switchable; co2; natural chitosan; chitosan aggregates

Journal Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Year Published: 2018

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