Diffusion-induced banding of colloid particles via diffusiophoresis: 2. Non-electrolytes

Abstract We have extended the stopped-flow diffusion cell (SFDC) technique (Staffeld, P. O., and Quinn, J. A., J. Colloid Interface Sci. 130, 69 (1989) to measurements of nonelectrolyte diffusiophoresis using 1-μm diameter latex particles in gradients of Dextran and Percoll. Dextran, a slightly branched nonionic polymer, and Percoll, a negatively charged polymer coated silica particle, interact with latex via steric exclusion at the latex surface. Anderson and Prieve's theory of nonelectrolyte diffusiophoresis is used to interpret the experimental measurements. Interaction parameters determined from our measurements are physically realistic and consistent with theoretical predictions.

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