Experimental Study of Traveling Wave Dielectrophoretic Pump
Date Issued
2007
Date
2007
Author(s)
Chen, James, Ming Chang
DOI
en-US
Abstract
This thesis studies experimentally the traveling wave dielectrophoretic pump, which is a
micropump suitable for delivering two-phase suspension medium, such as our blood. The pump is
essentially a straight microchannel with square cross section with array of electrodes built on one of
its walls. Ac voltage is applied to the electrodes with a certain phase shift on neighboring electrodes.
Both conventional and traveling wave dielectrophorsis are generated and drive the suspended
particles (or cells) in motion. When the traveling wave dielectrophoretic force dominates the
particle motion, the particles move along the direction of increasing phase if the imaginary part of
the Clausius factor is positive (or vice versa), drag their surrounding fluid, and thus the whole
medium is transported. We first manufactured the pump via MEMS techniques and demonstrate the
feasibility of the above idea for pumping using human blood. Then we studied the performance of
the pump for different parameters, including applied electric voltage, electric frequency, phase shift
for neighboring electrodes, number of electrodes, concentration of suspended particles (by varying
blood/saline ratio), different particles (blood cells of wister and human), without and with assistant
electrodes before the normal electrode array, and different driving sources (functional generator or
small IC chip). It is found that we have larger cell velocity for larger voltage, more electrodes, 90o
phase shift (in comparing with 120o), larger cells, and with assistant electrodes. Typical cell
velocity of human blood reaches 28.4 μm/s for 6 volts, 10 MHz, 90 phase shift and 24 electrodes
with assistant electrodes. The pump also works when it is integrated with a IC chip, which shows
the possibilities of building a small portable device. The result may find application in biomedical
area.
Subjects
旅波式介電泳
幫浦
紅血球
實驗
Traveling wave dielectrophoresis
pump
red blood cell
experiment
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-96-R94543060-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):da482e970ae5cf66455b53a73c220939