Self-assembly and nonlinear dynamics of dimeric colloidal rotors in cholesterics.
Self-assembly and nonlinear dynamics of dimeric colloidal rotors in cholesterics.
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胆甾醇中二聚体胶体转子的自组装和非线性动力学。
DOI：
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发表时间：
2011
影响因子：
8.6
通讯作者：
Davide Marenduzzo
中科院分区：
文献类型：
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作者：
J. Lintuvuori;K. Stratford;Michael E. Cates;Davide Marenduzzo
我们通过模拟研究了切向有序参数在粒子表面排列的胆甾型液晶中两个胶体粒子的物理行为。胶体二聚体之间的有效作用力在短距离内是有吸引力的，并且有利于胶体二聚体在相对于局部指向矢场的特定方向上的组装。当在沿螺旋轴的恒定力的作用下穿过流体时，我们发现这样的二聚体随着相移事件连续或逐步旋转。这些情况分别由急剧的动力学转变和导致二聚体取向和局部向列指向矢之间的恒定或不断增加的位相滞后所分开。
We study by simulation the physics of two colloidal particles in a cholesteric liquid crystal with tangential order parameter alignment at the particle surface. The effective force between the pair is attractive at short range and favors assembly of colloid dimers at specific orientations relative to the local director field. When pulled through the fluid by a constant force along the helical axis, we find that such a dimer rotates, either continuously or stepwise with phase-slip events. These cases are separated by a sharp dynamical transition and lead, respectively, to a constant or an ever-increasing phase lag between the dimer orientation and the local nematic director.