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Science 7 January 1994:
Vol. 263. no. 5143, pp. 66 - 68
DOI: 10.1126/science.263.5143.66
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Articles

Void Structure in Colloidal Dispersions

Kensaku Ito 1, Hiroshi Yoshida 2, and Norio Ise 3

1 Department of Chemical and Biochemical Engineering, Toyama University, Toyama 930, Japan
2 Department of Polymer Chemistry, Kyoto University, Kyoto 606-01, Japan
3 Fukui Research Laboratory, Rengo Co., Ltd., Jiyugaoko, Kanazu-cho, Sakai-gun, Fukui 919-06, Japan

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.

Submitted on August 4, 1993
Accepted on October 28, 1993


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