Edge dislocations of colloidal chains suspended in a nematic liquid crystal
Edge dislocations of colloidal chains suspended in a nematic liquid crystal
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悬浮在向列液晶中的胶体链的边缘位错
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
P. Barois
中科院分区：
文献类型：
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作者：
J. Loudet;P. Poulin;P. Barois
我们报告了在悬浮在向列溶剂中的胶体颗粒链的二维晶体中形成的边缘位错。该体系是由聚合物和液晶组成的二元混合物的相分离得到的。胶体结构由向列矩阵介导的弹性相互作用控制。由于后者破坏了转动不变性对称，现有理论无法恰当地描述位错周围的畸变。我们开发了一个简单的弹性模型来解释这种对称破缺，以获得控制链相互作用因素的信息。我们发现链的旋转模量和压缩/膨胀模量具有相同的数量级。我们还计算了单位错和对位错的能量。研究结果也适用于其他层状体系，如smics、胆固醇和表面活性剂层状相。
We report on the formation of edge dislocations in two-dimensional crystals of colloidal chains of particles suspended in a nematic solvent. The systems are obtained from a phase separation of a binary mixture composed of a polymer and a liquid crystal. The colloidal structures are governed by elastic interactions mediated by the nematic matrix. Since the latter one breaks the rotational invariance symmetry, distortions around dislocations cannot be appropriately described by existing theories. We develop a simple elastic model which accounts for this symmetry breaking to gain information on factors governing the chains interaction. We find that rotation and compression/dilatation moduli of the chains are of the same order of magnitude. We also calculate the energies of single and pairs of dislocations. The results should be relevant for other layered systems such as smectics, cholesterics and surfactant lamellar phases in the presence of an external field.