AC electrophoretic mobility of an optically trapped colloidal particle

Kohei Iki, Yasuyuki Kimura

研究成果: ジャーナルへの寄稿Conference article

抄録

It is important to understand the dynamics of ions around charged colloidal particles from the fundamental and application viewpoints. In this study, we develop a new measurement method of AC electrophoretic mobility of a micrometer-sized single colloidal particle in a wide frequency range over four decades. Fast and precise detection of the displacement of the particle is achieved by laser-trapping of the particle and using laser interferometry. The complex mobility of a silica particle of diameter of 1 μm dispersed in water is measured from 10 Hz to 10 kHz. The obtained apparent spectrum is found to contain the influence of laser trapping at lower frequencies and the dynamics of electro-osmotic flow induced by the charged cell surfaces. We succeed to observe the dynamics of the electrically induced bulk flow in a 100-μm-thick cell threedimensionally for the first time.

元の言語英語
記事番号OMC-5-02
ジャーナルProceedings of SPIE - The International Society for Optical Engineering
11141
出版物ステータス出版済み - 1 1 2019
イベントOptical Manipulation and Structured Materials Conference 2019 - Yokohama, 日本
継続期間: 4 22 20194 26 2019

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Electrophoretic mobility
alternating current
Laser interferometry
Trapping
Lasers
Silicon Dioxide
trapping
Laser Interferometry
Electroosmotic Flow
Laser
laser interferometry
Silica
Ions
Cell
cells
Water
lasers
Low Frequency
micrometers
frequency ranges

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

これを引用

AC electrophoretic mobility of an optically trapped colloidal particle. / Iki, Kohei; Kimura, Yasuyuki.

:: Proceedings of SPIE - The International Society for Optical Engineering, 巻 11141, OMC-5-02, 01.01.2019.

研究成果: ジャーナルへの寄稿Conference article

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