Ultrasonically induced microtransport

Moroney, R.M.; White, Richard M.; Howe, Roger T.

doi:10.1109/memsys.1991.114810

Cited by 75 publications

(53 citation statements)

References 9 publications

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“…The electrokinetic micropump is the basis of capillary microelectrichromatography which has seen a tremendous progress in science as well as in commercialization during the last several years, mainly pushed by the concept of the lab on a chip. RF and ultrasonic pumping exploit the dragging force of a progressive mechanical wave [5] or the quartz wind of a vertically oscillating surface [6] which are excited at a liquid-solid interface, e.g. the sidewall or the end wall of a microchannel.…”

Section: Introductionmentioning

confidence: 99%

A study on the MHD (magnetohydrodynamic) micropump with side-walled electrodes

Lim

Choi

2009

J Mech Sci Technol

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This paper presents the continuous flow MHD(magnetohydrodynamic) micropump with side walled electrodes using Lorentz force, which is perpendicular to both magnetic and electric fields, for the application of microfluidic systems. A theoretically simplified MHD flow model includes the theory of fluid dynamics and electromagnetics and it is based upon the steady state, incompressible and fully developed laminar flow theory. A numerical analysis with the finite difference method is employed for solving the velocity profile of the working fluid across the microchannel under various operation currents and magnetic flux densities. In addition, the commercial CFD code called CFD-ACE has been utilized for simulating the MHD micropump. When the program was run(CFD-ACE), the applied current and magnetic flux density were set to be the variables that affected the performance of the MHD micropump. The MHD micropump was fabricated by using MEMS technology. The performance of the MHD micropump was obtained by measuring the flow rate as the applied DC current was changed from 0 to 1mA at 4900 and 3300 Gauss for the electrodes with the lengths of 5000, 7500 and 10000 ㎛, respectively. The experimental results were compared with the analytical and the numerical results. In addition, with the theoretical analysis and the preliminary experiments, we propose a final model for a simple and new MHD micropump, which could be applicable to microfluidic systems.

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Section: Introductionmentioning

confidence: 99%

A study on the MHD (magnetohydrodynamic) micropump with side-walled electrodes

Lim

Choi

2009

J Mech Sci Technol

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“…(Fowler et al 2002 Ó IEEE) 2.6 Acoustic wave or vibration type Although, to the author's knowledge, the amount of research is highly limited, there exist acoustic-wave or vibration-type micropumps. Moroney et al (1991) proposed an ultrasonically induced (standing Lamb wave) microtransport system, while Miyazaki et al (1991) describe a piezoelectric pump driven by a flexural progressive wave.…”

Section: Electrohydrodynamic (Ehd) Typementioning

confidence: 99%

The wide variety of possible applications of micro-thermofluid control

Yoshida

2005

Microfluid Nanofluid

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“…These actuators can be categorized into two types; mechanical and nonmechanical actuators. For the mechanical actuators, check-valves, peristaltic valveless rectification, rotary, ultrasonic, and centrifugal pumps have been developed (Laser and Santiago 2004;van Lintel et al 1998;Smits 1998;Stemme and Stemme 1993;Doepper et al 1997;Ahn and Allen 1995;Moroney et al 1991;Oh and Ahn 2006). Examples of nonmechanical actuators include electro-osmosis, electrohydrodynamic, electrophoresis, dielectrophoresis, ferrofluidic, and magnetohydrodynamic pumps (Manz et al 1994;Bart et al 1990;Gunji et al 2001;Hatch et al 2001;Lemoff and Lee 2000).…”

Section: Introductionmentioning

confidence: 99%

Fabrication and mathematical analysis of an electrochemical microactuator (ECM) using electrodes coated with platinum nano-particles

2009

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This paper reports the design, fabrication, modeling, and analysis of an electrochemical microactuator (ECM). The driving mechanism of the ECM is based on the reversible electrolysis process of water. The expansion and shrinkage of gas bubbles generated in a micro electrochemical chamber during a reversible electrolysis process can be used for actuation in microfluidic systems. The fluidic components of the ECM were fabricated on a glass substrate using UV lithography of SU-8. Two electrodes were used, with one Pt black (coated with platinum nanoparticles) as working and auxiliary electrode and the other Ag/AgCl coated as reference. The nano particles coated on the working electrode help to boost the surfaceto-volume ratio of the electrode and to obtain higher operation frequency. Pulse electropotentials were supplied for active control of expansion and shrinkage of gas bubbles using reproducible electrochemical reactions. The theoretical volume change rate of gas bubbles was simulated as a function of time using the ideal gas law and compared with the measured volume change. The experimental results show the electrode coated with platinum nanoparticles helped to enhance the reversible electrolysis process significantly. The results also show that the dynamic model can be used to simulate the dynamic behaviors of the ECM actuator. The ECM can be used in microfluidic applications such as pumping or valves.

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Ultrasonically induced microtransport

Cited by 75 publications

References 9 publications

A study on the MHD (magnetohydrodynamic) micropump with side-walled electrodes

A study on the MHD (magnetohydrodynamic) micropump with side-walled electrodes

The wide variety of possible applications of micro-thermofluid control

Fabrication and mathematical analysis of an electrochemical microactuator (ECM) using electrodes coated with platinum nano-particles

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