Omnidirectional transport and navigation of Janus particles through a nematic liquid crystal film
Omnidirectional transport and navigation of Janus particles through a nematic liquid crystal film
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Janus粒子通过向列液晶薄膜的全方位传输和导航
DOI：
10.1103/physrevresearch.2.032009
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发表时间：
2019
影响因子：
4.2
通讯作者：
S. Dhara
中科院分区：
文献类型：
--
作者：
D. Sahu;S. Kole;S. Ramaswamy;S. Dhara
我们以金属介电Janus胶体的形式创造了可控的活性粒子，它通过向列液晶膜通过施加垂直交流电场的能量来获得运动性。我们通过改变场的振幅和频率来实现对轨迹的完全控制，在粒子轴和向列轴所跨的平面上随意操纵胶体。潜在的机制是利用电渗透流动对颗粒表面不对称性和液晶缺陷结构的敏感性。我们提出了由电场与方向锚定和两个半球上对比静电边界条件的相互作用产生的偶极力密度的计算，这解释了由于诱导的拉（推）力偶极子导致的胶体的介电向前（金属向前）运动。这些发现为胶体和液晶在受控运输、组装和集体动力学中的应用开辟了未知的方向。
We create controllable active particles in the form of metal-dielectric Janus colloids which acquire motility through a nematic liquid crystal film by transducing the energy of an imposed perpendicular AC electric field. We achieve complete command over trajectories by varying field amplitude and frequency, piloting the colloids at will in the plane spanned by the axes of the particle and the nematic. The underlying mechanism exploits the sensitivity of electro-osmotic flow to the asymmetries of the particle surface and the liquid-crystal defect structure. We present a calculation of the dipolar force density produced by the interplay of the electric field with director anchoring and the contrasting electrostatic boundary conditions on the two hemispheres, that accounts for the dielectric-forward (metal-forward) motion of the colloids due to induced puller (pusher) force dipoles. These findings open unexplored directions for the use of colloids and liquid crystals in controlled transport, assembly and collective dynamics.
影响因子：
16.6
作者：
Senyuk B;Puls O;Tovkach OM;Chernyshuk SB;Smalyukh II
通讯作者：
Smalyukh II