Confining blue phase colloids to thin layers
Confining blue phase colloids to thin layers
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DOI：
10.1039/c1sm05707c
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发表时间：
2011-10
期刊：
影响因子：
3.4
通讯作者：
M. Ravnik;J. Fukuda;J. Yeomans;S. Žumer
中科院分区：
文献类型：
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作者：
M. Ravnik;J. Fukuda;J. Yeomans;S. Žumer
用唯象模型演示了强限制胆甾相结构中的胶体组装。计算了受限蓝相强各向异性取向分布所固有的粒子捕获位和捕获势。捕获点的位置和捕获势的分布与颗粒的大小密切相关，而且捕获点的排列甚至可以改变对称性。捕获位置提供了各种胶体结构的强大结合，结合能为∼100kT的∼100纳米粒子。最大限度地利用粒子填充捕获位可以降低体系的全部自由能，从而为受限蓝色相的热力学稳定提供了手段。最后，我们介绍了错位笼子的形成，形成了一个由缺陷线组成的三维封闭网络，包围着足够大的具有强烈同向性锚定的粒子。
Colloidal assembly in strongly confined cholesteric structures is demonstrated using phenomenological modelling. Particle trapping sites and trapping potentials, which are intrinsically imposed by the strongly anisotropic orientational profile of the confined blue phases, are calculated. Locations of the trapping sites and profiles of the trapping potentials are shown to depend importantly on the particle size, and the array of trapping sites can even change symmetry. Trapping sites provide robust binding of various colloidal structures with binding energy of ∼100kT for ∼100 nm particles. Maximising the filling of the trapping sites by particles proves to lower the full free energy of the system, offering means for thermodynamic stabilisation of confined blue phases. Finally, we present formation of disclination cages, formed as a three-dimensional closed network of defect lines surrounding sufficiently large particles with strong homeotropic anchoring.