CHACHANIDZE, Revaz; XIE, Kaili; MASSAAD, Hanna; ROUX, Denis; DE LOUBENS, Clément; LEONETTI, Marc

doi:10.1016/j.jcis.2022.01.143

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CHACHANIDZE, Revaz
Laboratoire Rhéologie et Procédés [LRP]

XIE, Kaili
Laboratoire Rhéologie et Procédés [LRP]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

MASSAAD, Hanna
Laboratoire Rhéologie et Procédés [LRP]

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Document de travail - Pré-publication

Ce document a été publié dans

2022-06p. 911-920

Résumé en anglais

Controlling the assembly of polyelectrolytes and surfactant at liquid-liquid interfaces offers new ways to fabricate soft materials with specific physical properties. However, little is known of the relationships between the kinetics of interfacial assembly, structural and rheological properties of such interfaces. We studied the kinetics at water-oil interface of the assembly of a positively charged biopolymer, chitosan, with an anionic fatty acid using a multi-scale approach. The growth kinetics of the membrane was followed by interfacial rheometry and space-and time-resolved dynamic light scattering. This set of techniques revealed that the interfacial complexation was a multi-step process. At short timescale , the interface was fluid and made of heterogeneous patches. At a 'gelation' time, the surface elastic modulus and the correlation between speckles increased sharply meaning that the patches percolated. Confocal and electron microscopy confirmed this picture, and revealed that the basic brick of the membrane was sub-micrometric aggregates of chitosan / fatty acid.< Réduire

Mots clés en anglais

membrane

interface

rheology

dynamic light scattering

polyelectrolyte

biopolymer

DOI

http://dx.doi.org/10.1016/j.jcis.2022.01.143

Project ANR

Ingénierie de la Complexité : la mécanique et ses interfaces au service des enjeux sociétaux du 21iè - ANR-11-LABX-0030
Des écoulements interfaciaux aux viscosités de surface - ANR-18-CE06-0008

Origine

Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798