Segregation phenomena in monodisperse colloids
Segregation phenomena in monodisperse colloids
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单分散胶体中的偏析现象
DOI：
10.1016/0021-9797(76)90060-6
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
K. Takano
中科院分区：
文献类型：
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作者：
S. Hachisu;A. Kose;Yoko Kobayashi;K. Takano
外观通常为乳白色的单分散乳胶在某些条件下呈现出美丽的虹彩颜色。这种虹彩是由于乳胶球形颗粒的有序阵列对可见光的布拉格反射 (1) 造成的。作者表明，从乳白色态（无序）到虹彩态（具有有序结构）的转变不是由 DLVO 理论解释的，而是由关于流体和固态之间转变（柯克伍德-阿尔德转变）的统计理论解释的(2)。这种转变本质上与针状颗粒分散体中类晶团簇的形成相同，也就是说，这种转变的原因是熵性质的 (3)。作者一直通过显微镜观察来研究这种转变 (4)，在这项研究过程中，他们经常观察到伴随这种转变的分离现象；系统中碰巧包含的超大颗粒或聚集体（下文中将其称为“杂质”）被推出有序区域。相似的
A monodisperse latex which is ordinarily milky white in appearance exhibits beautiful iridescent colors under certain conditions. This iridescence is due to the Bragg reflection of visible light by the orderly arrays of the spherical particles of the latex (1). The authors showed that the transition from the milky white state (without order) to the iridescent state (with the ordered structure) is not explained by the DLVO theory but by a statistical theory about the transition between fluid and solid states (the Kirkwood-Alder transition)(2). This transition would be essentially the same as tactoid formation in a dispersion of needle-like particles, that is, the cause of this transition is of entropic nature (3). The authors have been studying this transition by microscopic observation (4) and in the course of this study they frequently observed segregation phenomena accompanying this transition; outsized particles or aggregates (hereafter these are referred to as" impurity") that happened to be contained in the system were pushed out of the ordered region. Similar