NDLI: Electric Charge Measurement on Micro-Particles Suspending in Electrokinetic Microfluidic Devices

Content Provider	IEEE Xplore Digital Library
Author	Yongqian Li Liding Wang Zheng Xu
Copyright Year	2006
Description	Author affiliation: Micro & Nano Electromech. Syst. Lab., Northwestern Poly Tech. Univ., Xi'an (Yongqian Li)
Abstract	When microcolloid particles are used as seeds in biologic and chemical experiments, they are often considered to be neutral. However, our experiments have proved that the charge on seeds can be significant in electrickinetic flow even if micro- particle's diameter is less than 500nm. A combination method of particle tracking velocimetry (PTV) and current method velocimetry has been proposed to measure the charge on polystyrene microparticles suspending in electrolyte. An equation between electrostatic force and Stokes-Einstein viscosity force applied on particles has been built in simply form of Basset-Boussinesq-Oseen equation. Observed mobility of particles is measured by PTV and electroosmotic mobility of the electrolyte is measured by current method velocimetry. Then the particles' electrophoretic mobility is obtained. The charge on the particles can be estimated statistically from the electrophoretic mobility considering electroosmotic mobility. Experiments indicate that the charge on polystyrene latex particles with diameter of 520 nm dispersing in the 20mM borax buffer is 10.1 times $10^{-17}$ C. In the pure grain alcohol, it is 2.1 times $10^{-17}$ C. The relatively deviation is analyzed to be less than 20 percent of the measurement value. This method is very important to investigate quantificationally electrokinetic microfluidic devices and microparticles dispersing in electrolyte
Starting Page	136
Ending Page	139
File Size	4775868
Page Count	4
File Format	PDF
ISBN	1424401399
DOI	10.1109/NEMS.2006.334655
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-01-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Charge measurement Electrokinetics Microfluidics Current measurement Particle measurements Electrostatic measurements Equations Chemicals Particle tracking Viscosity Microfluidic Electric charge Measurement Mcroparticle
Content Type	Text
Resource Type	Article

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