Interfacial Structuring in a Phase-Separating Mixed Biopolymer Solution Containing Colloidal Particles

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Abstract
We report confocal microscopy observations of the spatial distribution of monodisperse charge-stabilized colloidal particles (amphoteric polystyrene latex) incorporated within a spinodal-type phase-separating system of mixed biopolymers (gelatin + oxidized starch). Images from samples aged at 40 °C demonstrate a strong tendency for the added particles to accumulate at the liquid−liquid interface and to influence the rate of coarsening of the complex bicontinuous microstructure. Large variations in the local curvature of particle-rich interfacial regions are suggestive of a liquid−liquid boundary that is substantially viscoelastic.

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