Influence of cap weight on the motion of a Janus particle very near a wall
Influence of cap weight on the motion of a Janus particle very near a wall
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DOI：
10.1103/physreve.101.042606
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发表时间：
2020-04-23
影响因子：
2.4
通讯作者：
Wirth, Christopher L.
中科院分区：
文献类型：
--
作者：
Rashidi, Aidin;Razavi, Sepideh;Wirth, Christopher L.
各向异性纳米到微米尺度胶体颗粒在受限环境中的动力学，无论是邻近的颗粒还是边界，都与广泛的应用有关。我们利用布朗动力学模拟预测的平移和旋转波动的Janus球与帽的非匹配密度附近的边界。在实验相关条件下，由于重力扭矩，帽的存在显著影响了颗粒的旋转动力学。对于直径大于1 μ m、金帽厚度为20 nm的粒子，随机力矩以引力力矩为主。在这些条件下的Janus粒子采样主要是帽下或“淬火”取向。尽管本文总结的结果表明直径较小的颗粒（
The dynamics of anisotropic nano- to micro scale colloidal particles in confined environments, either near neighboring particles or boundaries, is relevant to a wide range of applications. We utilized Brownian dynamics simulations to predict the translational and rotational fluctuations of a Janus sphere with a cap of nonmatching density near a boundary. The presence of the cap significantly impacted the rotational dynamics of the particle as a consequence of gravitational torque at experimentally relevant conditions. Gravitational torque dominated stochastic torque for a particle >1 mu m in diameter and with a 20-nm-thick gold cap. Janus particles at these conditions sampled mostly cap-down or "quenched" orientations. Although the results summarized herein showed that particles of smaller diameter (