Colloids in liquid crystals: a lattice Boltzmann study
Colloids in liquid crystals: a lattice Boltzmann study
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液晶中的胶体：晶格玻尔兹曼研究
DOI：
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发表时间：
2010
期刊：
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通讯作者：
M. Cates
中科院分区：
文献类型：
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作者：
J. Lintuvuori;D. Marenduzzo;K. Stratford;M. Cates
我们提出了一种混合格子Boltzmann算法来模拟液晶主体内胶体粒子的流体动力学。为了验证我们的算法，我们研究了向列相中胶体的静态和微观流变学，并证实了向列相中的阻力具有明显的各向异性。然后，我们应用我们的方法来考虑胆甾体内部胶体的情况，并且在表面具有正常的锚定。我们发现，通过调节颗粒大小和胆甾相间距之间的比例，可以控制颗粒周围的缺陷构型，并稳定靠近胶体表面的新的八字形或高度扭曲的环。
We propose a hybrid lattice Boltzmann algorithm to simulate the hydrodynamics of colloidal particles inside a liquid crystalline host. To validate our algorithm, we study the static and the microrheology of a colloid in a nematic, with tangential anchoring of the director field at the particle surface, and we confirm theories and experiments showing that the drag force in a nematic is markedly anisotropic. We then apply our method to consider the case of a colloid inside a cholesteric, and with normal anchoring at the surface. We show that by tuning the ratio between particle size and cholesteric pitch it is possible to control the defect configuration around the particle, and to stabilise novel figure-of-eight or highly twisted loops close to the colloid surface.