Colloidal structures from bulk demixing in liquid crystals.
Colloidal structures from bulk demixing in liquid crystals.
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DOI：
10.1021/la048737f
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发表时间：
2004-09
期刊：
影响因子：
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通讯作者：
J. Loudet;P. Barois;P. Auroy;P. Keller;H. Richard;P. Poulin
中科院分区：
文献类型：
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作者：
J. Loudet;P. Barois;P. Auroy;P. Keller;H. Richard;P. Poulin
该实验论文涉及由连续液晶相和各向同性分散相组成的二元混合物的相分离。与各向同性二元混合物相反，所研究的混合物不会导致完全相分离，而是导致胶体颗粒的自排序，如先前报道的那样（Loudet, J. C. et al. Nature 2000, 407, 611）。我们在这里介绍了这种相分离的其他方面，包括相分离的动力学、类位错图案形成的起源、表面活性剂、手性添加剂和温度对形成的胶体结构的影响。目前的结果表明，（i）链阵列中的位错可以被视为动力学冻结缺陷，（ii）温度可用于控制分层时形成的域的大小，（iii）表面化学的轻微变化，通过添加表面活性剂，深刻改变形成的胶体结构，以及（iv）手性添加剂允许形成独特的螺旋珍珠链，反映它们嵌入的液晶相的对称性。
This experimental paper deals with phase separations of binary mixtures composed of a continuous liquid crystal phase and an isotropic dispersed phase. In contrast to isotropic binary mixtures, the investigated mixtures do not lead to a full phase separation but to a self-ordering of colloidal particles, as reported earlier (Loudet, J. C. et al. Nature 2000, 407, 611). We present here further aspects of such phase separations which include the kinetics of the phase separation, the origin of the formation of dislocation-like patterns, the influence of surfactants, chiral additives, and temperature on the formed colloidal structures. The present results show that (i) the dislocations in chain arrays can be seen as kinetically frozen defects, (ii) temperature can be used to control the size of the domains formed upon demixing, (iii) a slight change in surface chemistry, via the addition of surfactants, profoundly alters the formed colloidal structures, and (iv) chiral additives allow the formation of unique helical pearl chains which reflect the symmetry of the liquid crystal phase they are embedded in.