论文标题
表面活性剂浓度调节微粒在不均匀电场中的运动和放置
Surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field
论文作者
论文摘要
这项研究检查了表面活性剂对微粒在不均匀电场中的运动和定位的影响。将微粒用表面活性剂悬浮在油中，并使用锯齿图案的电极产生电场。将微粒捕获，振荡或连接到电极上。每个状态中微粒的比例是由表面活性剂的浓度和施加到电极上的电压定义的。基于电场中的微粒的轨迹，在微粒上吸附表面活性剂的新物理模型使微粒通过与电荷接触，带有正电荷或负电荷，而非吸附的表面活性剂在油中有助于充电散布。基于该模型的模拟表明，表面活性剂浓度调节的充电和电荷松弛可以解释被困，振荡和附着的微粒的轨迹和比例。这些结果将有助于开发新型的自组装和运输技术以及对电敏感的胶体。
This study examined the effects of surfactants on the motion and positioning of microparticles in an inhomogeneous electric field. The microparticles were suspended in oil with a surfactant and the electric field was generated using sawtooth-patterned electrodes. The microparticles were trapped, oscillated, or attached to the electrodes. The proportion of microparticles in each state was defined by the concentration of surfactant and the voltage applied to the electrodes. Based on the trajectory of the microparticles in the electric field, a newly developed physical model in which the surfactant was adsorbed on the microparticles allowed the microparticles to be charged by contact with the electrodes, with either positive or negative charges, while the non-adsorbed surfactant micellizing in the oil contributed to charge relaxation. A simulation based on this model showed that the charging and charge relaxation, as modulated by the surfactant concentration, can explain the trajectories and proportion of the trapped, oscillating, and attached microparticles. These results will be useful for the development of novel self-assembly and transport technologies and colloids sensitive to electricity.
