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Surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field

机译：表面活性剂浓度在非均匀电场中调节微粒的运动和放置

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摘要

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, oscillating, 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, we developed a new physical model in which the surfactant 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.
机译：该研究检测了表面活性剂对非均匀电场中微粒运动和定位的影响。用表面活性剂悬浮在油中的微粒，使用锯齿状电极产生电场。将微粒被捕获，振荡或附接到电极。通过表面活性剂的浓度和施加到电极的电压来限定每个状态的微粒的比例。基于电场中微粒的轨迹，我们开发了一种新的物理模型，其中吸附在微粒上的表面活性剂使微粒通过与电极接触而带有正或负电荷，而非吸附的表面活性剂胶束在油中有助于放松。基于该模型的模拟表明，由表面活性剂浓度调节的充电和充电弛豫可以解释被捕获，振荡和附着的微粒的轨迹和比例。这些结果对于开发新颖的自组装和运输技术以及敏感电力的胶体。

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  • 来源
    《RSC Advances》 |2020年第15期|共10页
  • 作者

    Masukawa Marcos K.; Hayakawa Masayuki; Takinoue Masahiro;

  • 作者单位

    Tokyo Inst Technol Dept Comp Sci Midori Ku 4259 Nagatsuta Cho Yokohama Kanagawa 2268502 Japan;

    Tokyo Inst Technol Sch Comp Dept Computat Intelligence &

    Syst Sci Midori Ku 4259 Nagatsuta Cho Yokohama Kanagawa 2268502 Japan;

    Tokyo Inst Technol Dept Comp Sci Midori Ku 4259 Nagatsuta Cho Yokohama Kanagawa 2268502 Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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