One-directional crystal growth in charged colloidal silica dispersions driven by diffusion of base.
One-directional crystal growth in charged colloidal silica dispersions driven by diffusion of base.
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DOI：
10.1021/ja049164w
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发表时间：
2004-05
影响因子：
15
通讯作者：
J. Yamanaka;Masako Murai;Yumie Iwayama;Masakastu Yonese;Kensaku Ito;T. Sawada
中科院分区：
文献类型：
--
作者：
J. Yamanaka;Masako Murai;Yumie Iwayama;Masakastu Yonese;Kensaku Ito;T. Sawada
带电胶体二氧化硅颗粒的水分散体显示了一种新的单向晶体生长的弱碱，吡啶的扩散。胶体晶体由柱状晶粒组成，其高度和宽度分别为厘米和亚厘米量级。的生长过程是可以解释的（i）吡啶的扩散与弱酸性二氧化硅表面之间的中和反应，（ii）充电的二氧化硅颗粒，和（iii）电荷诱导的分散体的结晶。
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.