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One-Directional Crystal Growth in Charged Colloidal Silica Dispersions Driven by Diffusion of Base
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- Junpei Yamanaka
- Faculty of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe, Mizuho, Nagoya, Aichi 467-8603, Japan, Faculty of Engineering, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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- Masako Murai
- Faculty of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe, Mizuho, Nagoya, Aichi 467-8603, Japan, Faculty of Engineering, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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- Yumie Iwayama
- Faculty of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe, Mizuho, Nagoya, Aichi 467-8603, Japan, Faculty of Engineering, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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- Masakastu Yonese
- Faculty of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe, Mizuho, Nagoya, Aichi 467-8603, Japan, Faculty of Engineering, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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- Kensaku Ito
- Faculty of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe, Mizuho, Nagoya, Aichi 467-8603, Japan, Faculty of Engineering, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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- Tsutomu Sawada
- Faculty of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe, Mizuho, Nagoya, Aichi 467-8603, Japan, Faculty of Engineering, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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Description
Aqueous dispersions of charged colloidal silica particles showed a novel one-directional crystal growth by diffusion of a weak base, pyridine. The colloidal crystal consisted of pillar-shaped crystal grains whose height and width were in the order of centimeter and subcentimeter, respectively. The growth process was explainable in terms of (i) the diffusion of pyridine with neutralization reactions between weakly acidic silica surfaces, (ii) charging up of the silica particles, and (iii) the charge-induced crystallization of the dispersions.
Journal
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- Journal of the American Chemical Society
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Journal of the American Chemical Society 126 (23), 7156-7157, 2004-05-18
American Chemical Society (ACS)