Visualizing the transient electroosmotic flow and measuring the zeta potential of microchannels with a micro-PIV technique.
We have demonstrated a transient micro particle image velocimetry (micro-PIV) technique to measure the temporal development of electroosmotic flow in microchannels. Synchronization of different trigger signals for the laser, the CCD camera, and the high-voltage switch makes this measurement possible with a conventional micro-PIV setup. Using the transient micro-PIV technique, we have further proposed a method on the basis of inertial decoupling between the particle electrophoretic motion and the fluid electroosmotic flow to determine the electrophoretic component in the particle velocity and the zeta potential of the channel wall. It is shown that using the measured zeta potentials, the theoretical predictions agree well with the transient response of the electroosmotic velocities measured in this work.
Yan
Deguang
D
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.
Nguyen
Nam-Trung
NT
Yang
Chun
C
Huang
Xiaoyang
X
D002627:Chemistry, Physical / Q000379:methods*; D004563:Electrochemistry / Q000379:methods*; D004573:Electrolytes; D007834:Lasers; D008856:Microscopy, Fluorescence; D015233:Models, Statistical; D008962:Models, Theoretical; D009995:Osmosis; D012107:Research Design; D012965:Sodium Chloride / Q000737:chemistry; D013997:Time Factors
D004573:Electrolytes; D012965:Sodium Chloride