Extraordinary behavior in the structural properties of colloidal macroions in deionized suspension and the importance of the Debye screening length
Extraordinary behavior in the structural properties of colloidal macroions in deionized suspension and the importance of the Debye screening length
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去离子悬浮液中胶体大离子结构特性的非凡行为以及德拜筛选长度的重要性
DOI：
10.1021/ar00151a005
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发表时间：
1988
影响因子：
18.3
通讯作者：
T. Okubo
中科院分区：
文献类型：
--
作者：
T. Okubo
最近，“去离子”胶体球的非凡悬浮特性引起了人们的广泛关注。单分散胶体球的悬浮液通常外观为乳白色，在去离子状态下呈现出美丽的虹彩颜色。这种虹彩是由于“类晶体”结构对可见光的布拉格反射造成的。胶体晶体的行为类似于相同原子的常见固体晶体。然而，它们的物理性质却非同寻常，主要是因为它们是类晶体液体，基本长度约为原子长度尺度的103-104倍。非凡性质的典型例子是（1）“类液”结构的X射线、中子和光散射曲线中存在宽峰，1-5（2）胶体球“类晶体”结构的显微观察，6-9（3）胶体晶体的光谱性质，10-15（4）“类气”、“类液”的特征动力学性质，以及“晶体状”胶体悬浮液，16-22 和 (5) 比粘度特性。 23-27
Recently, keen attention has been paid to the ex-traordinary suspension propertiesof “deionized” col-loidal spheres. A suspension of monodisperse colloidal spheres, which is usually milky white in appearance, exhibits beautiful iridescent colors in the deionized state. This iridescence is dueto the Bragg reflection of visible light by the “crystal-like” structures. The colloidal crystals behave like the usual solid crystals of identical atoms. However, their physical properties are extraordinary, mainly because they are crystal-like li-quids with a fundamental length of about 103-104 times that ofthe atomic length scale. Typical examples of the extraordinary properties are (1) existence of a broad peak in theX-ray, neutron, and light scattering curves for the “liquid-like” structures, 1-5 (2) microscopic ob-servation of “crystal-like” structures of colloidal spheres, 6-9 (3) spectroscopic propertiesof colloidal crystals, 10-15 (4) characteristic dynamic properties of “gas-like",“liquid-like”, and “crystal-like” colloidal suspensions, 16-22 and (5) specific viscosity properties. 23-27