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

Effect of poly(vinyl alcohol-co-vinyl acetate) copolymer blockiness on the dynamic interfacial tension and dilational viscoelasticity of polymer–anionic surfactant complex at the water–1-chlorobutane interface

“…31,32 Dilational viscoelasticity, inuenced not only by the variation of interfacial coverage, but also by the inter-molecular interactions, provides a deeper insight in the interface association or reorganization. Moreover, additional information can be obtained concerning the PVA-SDS complex formation at the interfaces and therefore the elastic modulus E 0 and the viscous modulus E 00 were determined in the absence and in the presence of SDS at a xed PVA concentration.…”

“…In the case of PVA with a DH of 73 mol%, the distribution of the acetate hydrophobic groups within the chain should have signicant effects on the interfacial viscoelasticity as it was observed for hydrophobic modied dextran or cellulose derivatives. 31,32 Dilational viscoelasticity, inuenced not only by the variation of interfacial coverage, but also by the inter-molecular interactions, provides a deeper insight in the interface association or reorganization. Moreover, additional information can be obtained concerning the PVA-SDS complex formation at the interfaces and therefore the elastic modulus E 0 and the viscous modulus E 00 were determined in the absence and in the presence of SDS at a xed PVA concentration.…”

Nano- and microparticles of gelled oil combining aminoacid-based low molecular weight organogelators and nonionic amphiphilic polysaccharides

“…This ability to redisperse after centrifugation was due to efficient stabilization by adsorbed dextran chains which produced steric repulsions between particles. Such redispersion ability has been already demonstrated in the case of oil-in-water emulsions stabilized by amphiphilic dextran derivatives [38,43].…”

“…For stabilizing oil-in-water emulsions, amphiphilic derivatives of dextran were used ( Figure 1). Surface activity and emulsifying properties of these polymers have been reported previously in detail, for the preparation of both micrometric and sub-micrometric emulsions [42][43][44]. Measurements of the surface tension of solutions of (L)-Phe in Tetralin with concentrations between 2.10 -4 and 2.10 -1 wt % at 20 °C revealed no significant difference with that found with Tetralin alone.…”

Rheology of interfacial layers

“…In another study presented by Rosenfeld and Fuller [50], consequences of interfacial viscoelasticity on the stability of thin liquid films were discussed. Additional work was dedicated to correlations between adsorption layers and liquid film properties, however, without a clear link to foam/emulsion rheology and stability [51][52][53][54][55][56]. In conclusion, there is still no direct approach for a link between parameters on a molecular scale and those on a macro scale of films and foams/emulsions.…”