Void Structure in Colloidal Dispersions

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Abstract

The time evolution of void structures in highly purified polymer latex dispersions was studied with a confocal laser scanning microscope.In such dispersions, which were initially homogeneous, the voids grew with time when the dispersions were kept standing and formed more quickly in the internal material than in material close to the glass-dispersion interface. Void formation is thus not an artifact arising from the presence of the interface. A similar structural inhomogeneity, in apparently homogeneous systems, is discussed for simple ionic solutions, ionic polymer solutions, and Langmuir-Blodgett films.

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