Electrokinetic micropump and micromixer design based on ac faradaic polarization (original) (raw)
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Research Article| August 01 2004
Center for Micro-fluidics and Medical Diagnostics, Department of Chemical and Biomolecular Engineering, University of Notre Dame
, Notre Dame, Indiana 46556
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Center for Micro-fluidics and Medical Diagnostics, Department of Chemical and Biomolecular Engineering, University of Notre Dame
, Notre Dame, Indiana 46556
Search for other works by this author on:
Center for Micro-fluidics and Medical Diagnostics, Department of Chemical and Biomolecular Engineering, University of Notre Dame
, Notre Dame, Indiana 46556
Search for other works by this author on:
Center for Micro-fluidics and Medical Diagnostics, Department of Chemical and Biomolecular Engineering, University of Notre Dame
, Notre Dame, Indiana 46556
Search for other works by this author on:
Center for Micro-fluidics and Medical Diagnostics, Department of Chemical and Biomolecular Engineering, University of Notre Dame
, Notre Dame, Indiana 46556
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Dmitri Lastochkin, Ronghui Zhou, Ping Wang, Yuxing Ben, Hsueh-Chia Chang
Center for Micro-fluidics and Medical Diagnostics, Department of Chemical and Biomolecular Engineering, University of Notre Dame
, Notre Dame, Indiana 46556
J. Appl. Phys. 96, 1730–1733 (2004)
A microfluidic pump and mixer design based on ac faradaic polarization is proposed. Unlike ac electrokinetic devices based on capacitive charging of the electrodes, the design yields a net electro-osmotic flow for high-conductivity electrolytes at high voltages and frequencies without producing gas bubbles or generating pH gradients. The average velocity, which can be more than an order of magnitude higher than that generated by the capacitive mechanism, has an exponential dependence on the voltage and increases monotonically at low frequencies. Vortices and net flows with linear velocities in excess of 1mm∕s are generated with orthogonal microfabricated planar electrodes based on the unique flow and polarization features of this new ac charging mechanism.
REFERENCES
S.
Zeng
,
C. -H.
Chen
,
J. C.
Mikkelsen
, and
J. G.
Santiago
,
Sens. Actuators B
79
,
107
(
2001
).
A. D.
Stroock
,
M.
Weck
,
D. T.
Chiu
,
W. T. S.
Huck
,
P. J. A.
Kenis
,
R. F.
Ismagilov
, and
G. M.
Whitesides
,
Phys. Rev. Lett.
84
,
3314
(
2000
).
Y.
Ben
and
H.-C.
Chang
,
J. Fluid Mech.
461
,
229
(
2002
);
S.-C.
Wang
,
Y. W.
Lai
,
Y.
Ben
and
H. -C.
Chang
,
Ind. Eng. Chem. Res.
43
,
2902
(
2004
).
A.
Minerick
,
A.
Ostafin
, and
H.-C.
Chang
,
J. Capillary Electrophor.
23
,
2165
(
2002
).
A.
Ajdari
,
Phys. Rev. E
61
,
R45
(
2000
).
A. B. D.
Brown
,
C. G.
Smith
, and
A. R.
Rennie
,
Phys. Rev. E
63
,
016305
(
2000
).
A.
Ramos
,
H.
Morgan
,
N. G.
Green
, and
A.
Castellanos
,
J. Phys. D
31
,
2338
(
1998
);
A.
Gonzalez
,
A.
Ramos
,
N. G.
Green
,
A.
Castellanos
, and
H.
Morgan
,
Phys. Rev. E
61
,
4019
(
2000
);
A.
Ramos
,
A.
Gonzalez
,
N. G.
Green
, and
H.
Morgan
,
Phys. Rev. E
67
,
056302
(
2003
).
P. J.
Sides
,
Langmuir
17
,
5791
(
2001
);
M.
Traw
,
D. A.
Saville
, and
I. A.
Aksay
,
Langmuir
13
,
6375
(
1997
).
T. M.
Squires
and
M. Z.
Bazant
,
Phys. Rev. Lett.
92
,
066101
(
2004
).
A. J.
Bard
and
L. R.
Faulkner
,
Electrochemical Methods
, (
Wiley
, New York,
2001
).
S.
Thamida
and
H. -C.
Chang
,
Phys. Fluids
14
,
4315
(
2002
);
P.
Takhistov
,
K.
Duginova
, and
H.-C.
Chang
,
J. Colloid Interface Sci.
263
,
133
(
2003
).
© 2004 American Institute of Physics.
2004
American Institute of Physics
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