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Dilational rheology of air/water interfaces covered by nonionic amphiphilic polysaccharides. Correlation with stability of oil-in-water emulsions

Abstract : Biodegradable polymeric emulsifiers were prepared by covalent attachment of aliphatic hydrocarbon groups onto dextran macromolecules (a bacterial nonionic polysaccharide), varying the number of attached hydrocarbon tails. Submicronic oil-in-water emulsions were prepared by sonication using previous polymeric stabilizers with oil volume fractions between 10 and 50% and two oils (hexadecane and nujol). An optimal range of dextran hydrophobic modification was evidenced conciliating a strong anchoring of polymer to oil/water interface and sufficient steric repulsions between droplets. These results were correlated to dilational rheology of air/water interfaces covered by amphiphilic dextrans. The storage stability of these emulsions was of several weeks.
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https://hal.univ-lorraine.fr/hal-01498197
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Submitted on : Wednesday, March 29, 2017 - 4:52:14 PM
Last modification on : Monday, March 29, 2021 - 4:07:01 PM

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Rudy Covis, Jacques Desbrières, Emmanuelle Marie, Alain Durand. Dilational rheology of air/water interfaces covered by nonionic amphiphilic polysaccharides. Correlation with stability of oil-in-water emulsions. Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2014, 441, pp.312-318. ⟨10.1016/j.colsurfa.2013.09.027⟩. ⟨hal-01498197⟩

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