Measurement of zeta-potential at microchannel wall by a nanoscale laser induced fluorescence imaging

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Abstract

A nanoacale laser induced fluorescence technique was proposed by using fluorescent dye and evanescent wave with total internal reflection of laser beam. The present study focused on the two-dimensional measurement of zeta-potential at the microchannel wall, which is an electrostatic charge of the wall surface and a characteristic property of an electroosmotic flow field. The evanescent wave, which decays exponentially from the wall, was used as an excitation light of the fluorescent dye. The fluorescent intensity in the vicinity of wall detected by a CCD camera is closely related to the zeta-potestial. Two kinds of fluorescent dye solution with different ionic concentration were injected into a T-shaped microchannel, and formed a mixing flow field in the junction area. The two-dimensional distribution of zeta-potential was measured at the microchannel wall in a pressure driven flow field. A transverse gradient of zeta-potential was observed in the mixing field, and the two-dimensional distribution of zeta-potential was changed by the difference in the averaged velocity. To understand the ion motion in the mixing flow field, the three-dimensional structure of flow field was analyzed by velocity measurement using micron-resolution particle image velocimetry and numerical simulation. It is concluded that the two-dimensional distribution of zeta-potential at the microchannel wall was dependent on the ion motion in the flow field, which was governed by convection and molecular diffusion.

Original languageEnglish
Pages (from-to)2457-2464
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume72
Issue number10
Publication statusPublished - 2006 Oct

Fingerprint

Zeta potential
microchannels
Microchannels
laser induced fluorescence
Flow fields
flow distribution
Fluorescence
Imaging techniques
Lasers
ion motion
Dyes
dyes
evanescent waves
Velocity measurement
electrostatic charge
dimensional measurement
molecular diffusion
Ions
particle image velocimetry
CCD cameras

Keywords

  • Electric double layer
  • Evanescent wave
  • Laser induced fluorescence
  • Nanoscale
  • Zeta-potestial

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "A nanoacale laser induced fluorescence technique was proposed by using fluorescent dye and evanescent wave with total internal reflection of laser beam. The present study focused on the two-dimensional measurement of zeta-potential at the microchannel wall, which is an electrostatic charge of the wall surface and a characteristic property of an electroosmotic flow field. The evanescent wave, which decays exponentially from the wall, was used as an excitation light of the fluorescent dye. The fluorescent intensity in the vicinity of wall detected by a CCD camera is closely related to the zeta-potestial. Two kinds of fluorescent dye solution with different ionic concentration were injected into a T-shaped microchannel, and formed a mixing flow field in the junction area. The two-dimensional distribution of zeta-potential was measured at the microchannel wall in a pressure driven flow field. A transverse gradient of zeta-potential was observed in the mixing field, and the two-dimensional distribution of zeta-potential was changed by the difference in the averaged velocity. To understand the ion motion in the mixing flow field, the three-dimensional structure of flow field was analyzed by velocity measurement using micron-resolution particle image velocimetry and numerical simulation. It is concluded that the two-dimensional distribution of zeta-potential at the microchannel wall was dependent on the ion motion in the flow field, which was governed by convection and molecular diffusion.",
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author = "Yutaka Kazoe and Yohei Sato",
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AB - A nanoacale laser induced fluorescence technique was proposed by using fluorescent dye and evanescent wave with total internal reflection of laser beam. The present study focused on the two-dimensional measurement of zeta-potential at the microchannel wall, which is an electrostatic charge of the wall surface and a characteristic property of an electroosmotic flow field. The evanescent wave, which decays exponentially from the wall, was used as an excitation light of the fluorescent dye. The fluorescent intensity in the vicinity of wall detected by a CCD camera is closely related to the zeta-potestial. Two kinds of fluorescent dye solution with different ionic concentration were injected into a T-shaped microchannel, and formed a mixing flow field in the junction area. The two-dimensional distribution of zeta-potential was measured at the microchannel wall in a pressure driven flow field. A transverse gradient of zeta-potential was observed in the mixing field, and the two-dimensional distribution of zeta-potential was changed by the difference in the averaged velocity. To understand the ion motion in the mixing flow field, the three-dimensional structure of flow field was analyzed by velocity measurement using micron-resolution particle image velocimetry and numerical simulation. It is concluded that the two-dimensional distribution of zeta-potential at the microchannel wall was dependent on the ion motion in the flow field, which was governed by convection and molecular diffusion.

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