多分散板状胶体的分段结晶的实验观察。

Experimental observation of fractionated crystallization in polydisperse platelike colloids.

机构信息

Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Utrecht University, Utrecht, The Netherlands.

出版信息

Langmuir. 2010 May 18;26(10):6898-901. doi: 10.1021/la100993k.

DOI:10.1021/la100993k

PMID:20392119

Abstract

We have discovered that the long-term aging of the hexagonal columnar liquid-crystal phase of polydisperse gibbsite platelets leads to fractionated crystallization, that is, to the formation of coexisting columnar crystals with different periods. This process was revealed by microradian X-ray diffraction demonstrating the splitting of the Bragg intercolumnar reflections into sequences of sharper reflections. The fractionated crystallization was observed in a number of samples of sterically stabilized as well as charge-stabilized polydisperse gibbsite platelets.

摘要

我们发现，多分散三水铝石薄片的六方柱状液晶相的长期老化会导致分级结晶，即形成具有不同周期的共存柱状晶体。通过微弧度 X 射线衍射揭示了这一过程，该衍射证明了 Bragg 柱间反射的分裂成一系列更尖锐的反射。在许多位阻稳定和电荷稳定的多分散三水铝石薄片的样品中观察到了分级结晶。