Electrophoretic mobility has been widely used to evaluate the zeta potential of individual colloidal particles, which governs the stability of colloidal dispersions. We demonstrated two experimental methods to measure the AC electrophoretic mobility μ of micron-sized single particles using holographic video microscopy. The three-dimensional position of the particle was estimated by reconstructing the light field from its two-dimensional holographic image, using the Rayleigh-Sommerfeld back-propagation method. In a planar electric field setup, the height dependence of the measured value of μ in the cell enables us to evaluate the actual value of μ, without interference from electroosmotic flow. In a vertical setup, the true value of μ can be directly evaluated by minimizing the influence of the electrode polarization, using a thick cell and a high-frequency electric field. The estimated values of μ obtained using both methods agree with that from conventional electrophoretic light scattering. We also evaluated the distribution of μ values within a colloidal dispersion.
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15 April 2019
Research Article|
April 18 2019
AC electrophoretic mobility of individual microscale colloidal particles measured using holographic video microscopy
Toyokazu Ikeda;
Toyokazu Ikeda
Department of Physics, School of Science, Kyushu University
, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Haruka Eitoku;
Haruka Eitoku
a)
Department of Physics, School of Science, Kyushu University
, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Yasuyuki Kimura
Yasuyuki Kimura
b)
Department of Physics, School of Science, Kyushu University
, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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a)
Present address: NTT Network Service Systems Laboratory, NTT Corporation, 3-9-11 Midori-cho, Musashino, Tokyo 180-8585, Japan.
b)
Electronic mail: [email protected]
Appl. Phys. Lett. 114, 153703 (2019)
Article history
Received:
January 13 2019
Accepted:
April 03 2019
Citation
Toyokazu Ikeda, Haruka Eitoku, Yasuyuki Kimura; AC electrophoretic mobility of individual microscale colloidal particles measured using holographic video microscopy. Appl. Phys. Lett. 15 April 2019; 114 (15): 153703. https://doi.org/10.1063/1.5088723
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