Response of a doublet to a nearby dc electrode of uniform potential.
Response of a doublet to a nearby dc electrode of uniform potential.
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双峰对附近均匀电位直流电极的响应。
DOI：
10.1103/physreve.94.042614
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Sri Harsha Nuthalapati
中科院分区：
文献类型：
--
作者：
C. Wirth;Sri Harsha Nuthalapati
近三十年来，人们一直在研究电场辅助球形胶体粒子在电极附近的定向组装。最近，焦点已经转移到电场辅助组装和推进非球形（即，各向异性）粒子。本文描述了对直流电场作用下的不对称双态电势和尺寸的计算和结果。双峰经历了一个净垂直力，这取决于两个不对称性的电位和叶的大小。此外，双峰经历了垂直于所施加的电场的净横向力。侧向力取决于两个脑叶的微电位差、脑叶大小的不对称性以及偶极子的倾斜角度。净力被用来预测的表观横向速度，这被发现是垂直于所施加的电场。此外，颗粒经历了从净扭矩的旋转，这取决于瓣大小的不对称性，也是对的倾斜角。预测的速度的大小是相同的数量级，已观察到的粒子在实验中的交流电场响应。这些结果表明，波瓣的电位，波瓣的大小，和胶体偶极子的方向可以调整，以实现推进。
The electric-field-assisted directed assembly of spherical colloidal particles near an electrode has been studied for nearly three decades. Recently, focus has shifted to the electric-field-assisted assembly and propulsion of nonspherical (i.e., anisotropic) particles. This paper describes calculations and results for a doublet of asymmetric ζ potential and size responding to a dc electric field. The doublet experienced a net vertical force that depended on both the asymmetry in ζ potential and lobe size. In addition, the doublet experienced a net lateral force perpendicular to the applied electric field. The lateral force depended on the difference in ζ potential of the two lobes, the lobe size asymmetry, and also the angle of inclination of the doublet. The net force was used to predict an apparent lateral velocity, which was found to be perpendicular to the applied electric field. In addition, the particle experienced rotation from a net torque that depended on the lobe size asymmetry and also the angle of inclination of the doublet. The magnitude of the predicted velocity was of the same order of magnitude as has been observed for particles responding to ac electric fields in experiments. These results demonstrate that lobe ζ potential, lobe size, and orientation of a colloidal doublet can be tuned to achieve propulsion.