Method and apparatus for determining zeta potential using...

Chemistry: analytical and immunological testing – Measurement of electrical or magnetic property or thermal...

Reexamination Certificate

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C422S081000, C422S082010, C422S050000, C422S068100, C422S082020, C436S043000, C436S063000, C073S001010, C073S001020, C073S053010, C204S164000, C204S450000, C204S452000, C204S457000, C204S458000, C204S461000, C204S193000, C204S194000, C204S400000

Reexamination Certificate

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10698507

ABSTRACT:
Provided is a method for determining a zeta potential generated between a solid wall and a solution. The method includes (a) injecting an electrolyte solution into a first inlet of a T channel, which is provided with first and second inlet electrodes and a grounded outlet electrode, and a mixed solution of the electrolyte solution and a fluorescent dye into a second channel of the T channel and maintaining a steady-state of the two solutions; (b) applying a direct current electric field from the first and second electrodes to the outlet electrode to form an interface between the electrolyte solution and the mixed solution; (c) applying an alternating current electric field from one of the two inlet electrodes to the outlet electrode to oscillate the interface; and (d) measuring an amplitude of oscillation of the interface and determining the zeta potential from the standard relationship between the zeta potential and the amplitude.

REFERENCES:
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patent: 4602989 (1986-07-01), Culkin
patent: 6051124 (2000-04-01), Aoki
patent: 2 368 904 (2002-05-01), None
“Determination of the Zeta Potential and the Surface Conductivity by Streaming Potential and Streaming Current Measurements” Authors: Ralph Zimmermann, Wolfgang Jenschke, Heinz Korber, Carsten Werner; Technisches Messen TM, R. Oldenbourg Verlag. Munchen, DE, vol. 67, No. 9, Sep. 2000, pp. 353-360, XP001132480, ISSN: 0171-8096.
European Search Report of EP 03 02 6144; Date of Completion of the Search: Dec. 15, 2004.
“The ζ-Potential of Glass Surface in Contact with Aqueous Solutions”; Authors: Yongan Gu and Dongqing Li; Academic Press; Journal of Colloid and Interface Science, vol. 226; 2000; pp. 328-339.
“Current-Monitoring Method for Measuring the Electroosmotic Flow Rate in Capillary Zone Electrophoresis”; Authors: Xiaohua Huang, Manuel J. Gordon and Richard N. Zare; American Chemical Society; Anal. Chem., vol. 60; 1988; pp. 1837-1838.

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