Large single crystals of colloidal silica spheres appearing in deionized and diluted suspension
Large single crystals of colloidal silica spheres appearing in deionized and diluted suspension
复制标题
去离子和稀释悬浮液中出现大的胶体二氧化硅球单晶
DOI：
10.1007/bf00651821
复制
发表时间：
1993
影响因子：
2.4
通讯作者：
T. Okubo
中科院分区：
文献类型：
--
作者：
T. Okubo
对单分散二氧化硅球（直径：110 nm±4.5 nm（标准差））胶体晶体中的晶体（被晶界包围的单晶）进行了特写彩色照片拍摄。对于完全去离子和稀释的悬浮液，用肉眼（第一次）观察到非常大的晶体（3 ~ 4 mm）。去离子化是用超过两周的离子交换树脂混合床精心制作的。随着球浓度的降低，晶粒尺寸急剧增大，当球浓度略高于熔向液态结构的临界浓度时，晶粒尺寸变小。在照片中可以识别出晶体的形状，即三角形、立方体、五边形、六边形、锥形等混合形状。
Close-up color photographs are taken for crystallites (single crystals surrounded by the grain boundaries) in the colloidal crystals of monodisperse silica spheres (diameter: 110 nm±4.5 nm (standard deviation)). Very large crystallites (3∼4 mm) are observed with the naked eye (for the first time) for the completely deionized and diluted suspensions. Deionization is carefully made with the mixed beds of ion-exchange resins more than 2 weeks old. Size of the crystallites increases sharply as the concentration of spheres decreases, and becomes small at the concentrations slightly higher than the critical concentration of melting toward liquid-like structure. Shape of the crystallites, i.e., mixture of triangle, cubic, pentagonal, hexagonal, cone-like, etc., is recognized in the photographs.