Wetting Behavior in Colloid-Polymer Mixtures at Different Substrates

Author(s): Wijting, Willem K., Nicolaas A. M. Besseling, Martien A. Cohen Stuart

Journal: J. Phys. Chem. B (2003) 107: 10565-10570.

Abstract:
We present experimental observations on wetting phenomena in depletion interaction driven, phase separated colloidal dispersions. The contact angle of the colloidal liquid-gas interface at a solid substrate was determined for a series of compositions. Upon approach to the critical point, a transition occurs from partial to complete wetting. The interaction with the substrate was manipulated by modifying the substrate with a polymer. In that case, a transition from partial to complete drying is observed upon approach to the critical point.