Dynamic electrophoretic mobility of colloidal particles measured by the newly developed method of quasi-elastic light scattering in a sinusoidal electric field

D. Mizuno, Y. Kimura, R. Hayakawa

研究成果: Contribution to journalArticle査読

22 被引用数 (Scopus)

抄録

We developed a new method for measuring the dynamic electrophoretic mobility μ* and apparent diffusion coefficient D of colloidal particles in a sinusoidal electric field by employing the heterodyne method of light scattering. The frequency of the scattered light is sinusoidally modulated due to the Doppler effect if there is no Brownian motion of colloidal particles. The undesirable influence of Brownian motion is removed by squaring the time-domain signal, and μ* is obtained from the second and fourth harmonic components of signal detected with a lock-in amplifier. On the other hand, the influence of electrophoresis is excluded to obtain D by calculating the autocorrelation function of the component at the same frequency of the applied electric field. This method is applied to a suspension of latex particles, and the complex spectrum of μ* is successfully measured for the first time in a wide frequency range below 50 kHz. The obtained spectrum of μ* shows relaxation, and the apparent diffusion coefficient D has the applied field dependence. These findings are probably due to an anomalous double-layer polarization process which has been theoretically predicted. The applicability of our method to the measurement for concentrated colloidal suspensions through which laser light cannot pass is also discussed.

本文言語英語
ページ(範囲)9547-9554
ページ数8
ジャーナルLangmuir
16
24
DOI
出版ステータス出版済み - 11 28 2000
外部発表はい

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 表面および界面
  • 分光学
  • 電気化学

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