A micropump operating with chemically produced oxygen gas

Choi, Yo Han; Son, Seok Man; Lee, Seung S.

doi:10.1016/j.sna.2003.10.005

Cited by 50 publications

(28 citation statements)

References 6 publications

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“…Manganese dioxide (MnO 2 ) can catalyze the decomposition of H 2 O 2 to H 2 O and O 2 [19]. MnO 2 was used to quench the residual (unreacted) H 2 O 2 in the sample in order to prevent the interference of H 2 O 2 on COD analysis [20][21][22].…”

Section: Methodsmentioning

confidence: 99%

COD and color removal from synthetic textile wastewater by ultrasound assisted electro-Fenton oxidation process

Şahinkaya

2013

Journal of Industrial and Engineering Chemistry

120

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Section: Methodsmentioning

confidence: 99%

COD and color removal from synthetic textile wastewater by ultrasound assisted electro-Fenton oxidation process

Şahinkaya

2013

Journal of Industrial and Engineering Chemistry

120

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“…However, in many cases, the complexity of micro pumps and valves makes their integration into microfluidic systems difficult and expensive. To solve the problem, micro pumps using chemically produced gas as the source of pumping power were presented (Choi et al 2004a(Choi et al , 2004b. The micro pumps have the advantages of easy integration, low power consumption and totally biocompatible gas output.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1a shows that a microchannel filled with liquid can be used as a micro relief valve. When a meniscus is formed at the liquid-gas interface, the capillary pressure can be calculated by the Laplace and Young equation (Chi 1976).…”

Section: Introductionmentioning

confidence: 99%

Passive microfluidic gas valves using capillary pressure

2009

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In this study, we developed micro gas valves which can control the gas pressure inside microfluidic systems in a simple and passive way. We designed a microfluidic chip having a liquid reservoir, a gas chamber and a microchannel connecting them to demonstrate both a micro relief valve and a micro regulator on a chip. We fabricated and tested the microfluidic chip to check the feasibility of the proposed micro valves. Test results show that when the gas pressure is greater than the relief pressure the micro relief valve discharges the gas decreasing the system pressure down to the atmospheric pressure. Also, the micro regulator kept the system pressure constant regardless of the degree of the over-pressure at pressure source. The proposed valves would be good candidates for cheap and reliable gas pressure controller in various microfluidic systems using gases.

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“…However, piezoelectric units generally require operating voltages larger than 100 V (13,15). Alternatively, nonmechanical pumps with no moving parts generate a driving force using ions energized via electrohydrodynamic (16), electroosmotic (17), or electrochemical (18,19) effects. However, ion pumps are generally only applicable for low-conductivity liquids, produce relatively low flow rates, and need very high voltages (in the order of kilovolts) to operate (13).…”

mentioning

confidence: 99%

Liquid metal enabled pump

Tang¹,

Khoshmanesh²,

Sivan³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

335

285

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Small-scale pumps will be the heartbeat of many future micro/ nanoscale platforms. However, the integration of small-scale pumps is presently hampered by limited flow rate with respect to the input power, and their rather complicated fabrication processes. These issues arise as many conventional pumping effects require intricate moving elements. Here, we demonstrate a system that we call the liquid metal enabled pump, for driving a range of liquids without mechanical moving parts, upon the application of modest electric field. This pump incorporates a droplet of liquid metal, which induces liquid flow at high flow rates, yet with exceptionally low power consumption by electrowetting/deelectrowetting at the metal surface. We present theory explaining this pumping mechanism and show that the operation is fundamentally different from other existing pumps. The presented liquid metal enabled pump is both efficient and simple, and thus has the potential to fundamentally advance the field of microfluidics.E ngines are systems that convert different kinds of energy into mechanical motion, which are used in various microscale systems, including laboratory-on-a-chip microreactors (1-3), microelectromechanical (MEMS) actuators (4), and microscale heat exchangers (5, 6), to name just a few. Some of the most important members of the engine family are liquid pumps. In the small-scale regime, such pumps can be mainly classified into mechanical and nonmechanical. For mechanical pumps, the driving force is generated by moving parts that are energized using piezoelectric (7), electrostatic (8), thermopneumatic (9), pneumatic (10), electromagnetic (11) effects, or deformation through electrowetting (12). Mechanical pumping systems have several drawbacks, which largely stem from the fact that moving parts cause energy loses due to heat generated by friction and their rather complicated fabrication processes (13,14). In addition, the existence of moving parts increases the potential for failure, which can become acute in complex systems and which could potentially include numerous pumps. Among the varieties of mechanical pumps, only piezoelectric units can produce high flow rates as large as 20,000 μL/min at relatively low input power (>50 mW) (13, 15). However, piezoelectric units generally require operating voltages larger than 100 V (13, 15). Alternatively, nonmechanical pumps with no moving parts generate a driving force using ions energized via electrohydrodynamic (16), electroosmotic (17), or electrochemical (18, 19) effects. However, ion pumps are generally only applicable for low-conductivity liquids, produce relatively low flow rates, and need very high voltages (in the order of kilovolts) to operate (13). Therefore, a pumping system with no moving parts, high flow rate, and low power consumption is ideal for many present-day and emerging applications in microfluidic systems. An ambitious vision is that such pumps can potentially be used for moving small objects on demand, assembling them to create new structures, or could ...

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A micropump operating with chemically produced oxygen gas

Cited by 50 publications

References 6 publications

COD and color removal from synthetic textile wastewater by ultrasound assisted electro-Fenton oxidation process

COD and color removal from synthetic textile wastewater by ultrasound assisted electro-Fenton oxidation process

Passive microfluidic gas valves using capillary pressure

Liquid metal enabled pump

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