Attractive glass formation in aqueous mixtures of colloidal gibbsite platelets and silica spheres
Attractive glass formation in aqueous mixtures of colloidal gibbsite platelets and silica spheres
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在胶体三水铝石片和二氧化硅球的水性混合物中形成有吸引力的玻璃
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发表时间：
2011
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影响因子：
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通讯作者：
H. Lekkerkerker
中科院分区：
文献类型：
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作者：
D. Kleshchanok;J. Meijer;A. Petukhov;G. Portale;H. Lekkerkerker
我们对胶体三水铝石片和二氧化硅球的混合物中有吸引力的玻璃形成进行了实验研究。片状体的直径为233nm，片状体与球体的直径比为13.8。玻璃的形成是由球体引起的短程耗尽吸引力引起的。在足够高的球体浓度下，耗尽吸引力足够强，使得混合物不会形成平衡液晶相，而是会形成玻璃。通过微弧度 X 射线衍射测量，我们提供了有关捕获玻璃态结构的详细信息。在耗尽较弱的混合物中，它由嵌入不太有序的玻璃状周围的液晶袋组成。随着系统中吸引力的增强，这些区域的尺寸会减小，直到有吸引力的玻璃的结构变得完全无序且各向同性。
We present an experimental study on the attractive glass formation in mixtures of colloidal gibbsite platelets and silica spheres. The platelets are 233 nm in diameter, and the diameter ratio between the platelets and the spheres is 13.8. The glass formation is induced by the short-ranged depletion attraction caused by the spheres. At sufficiently high sphere concentrations the depletion attraction is strong enough that the mixtures do not form the equilibrium liquid-crystalline phases, but the glass formation occurs instead. Using microradian X-ray diffraction measurements we provide detailed information about the structure of the arrested glass state. In mixtures with weaker depletion it consists of liquid-crystalline pockets embedded in the less ordered glassy surrounding. With a stronger attraction in the system the size of these domains decreases, until the structure of the attractive glass becomes completely disordered and isotropic.