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Showing 1 to 15 of 15 for “"Microvalve"”.
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A low-leakage 3-way silicon microvalve
… presents an electrostatically actuated silicon microvalve designed for use in a miniature gas chromatography system for sample preparation and injection. In contrast to prior art, this design combines an integrated low voltage electrostatic microactuator as well as tight sealing capability. The …
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Mechanical and electrical properties of carbon nanotubes surface-stamped on polydimethylsiloxane for microvalve actuation
I report on the study of the electrical and mechanical effects of the inclusion of a thin layer of multiwalled carbon nanotubes (MWCNT) into the surface of polydimethylsiloxane (PDMS) as a method of creating an electrically actuated, flexible microfluidic valve. Samples of PDMS loaded with various …
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Design and testing of a microvalve capable of precisely controlling low fluidic flow rates
… and testing for a gas flow regulating microvalve is presented herein. The microvalve project served as a test bed for new micromachining techniques and for exploration of MEMS devices made from non-silicon materials. We developed and tested a novel microvalve utilizing a passive …
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Design, modeling, fabrication and testing of a piezoelectric microvalve for high pressure, high frequency hydraulic applications
… piezoelectrically-driven hydraulic amplification microvalve for use in high specific power hydraulic pumping applications was designed, fabricated, and experimentally characterized. High frequency, high force actuation capabilities were enabled through the incorporation of one or more bulk …
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Electrostatically Actuated Microvalves Fabricated with Soft-Lithographic Techniques for Integrated Microfluidics
… systems, however, requires the development of a microvalve that can effectively control connectivity between microfluidic components. Ideally, the valve should be fabricated with simple techniques at low temperature and ambient pressure to facilitate wide dissemination of the technology and also …
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Reduction of Unsteady Stator-Rotor Interaction by Trailing Edge Blowing Using MEMS Based Microvalves
… Each blowing hole is connected to a MEMS based microvalve, which controls the blowing rate of the hole. The microvalve is actuated by a signal voltage, generated by a PID controller that accepts free stream and wake axial flow velocities as inputs and minimizes their difference. To quantify the …
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Bucky gel actuator for morphing applications
… that BGA has the capability to be employed as a microvalve. A flow regulator utilizing a BGA microvalve was designed and fabricated. Flow rate measurements showed the capability of BGA-valve in manipulating the flow rate in different ranges.
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Design and Development of a Portable Microfluidic System for Medical Diagnostics
… fabrication, and characterization of a latchable microvalve is presented. Such a valve would be quite useful in a portable LOC for fluid storage and low power operation. Finally, I present my work towards realizing a portable instrument that interfaces directly with an LOC to create a simplified …
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Microfluidic temporal cell stimulation
… challenge, I developed a JAVA-based programmable microvalve system for automated control of reagent delivery enabling the end user to generate complex chemical waveforms and perform multiple assays on individually addressable cell chambers on chip. Typically, signaling behavior has been inferred …
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Novel methods for microfluidic mixing and control
… aim to optimize our system to develop a robust microvalve technology.
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Integrated micro fuel cells with on-board hydride reactors and autonomous control schemes
… from accumulated hydrogen acting on a gas-liquid microvalve. This control scheme improves uniformity of power delivery during long periods of lower power demand, with fast switching to mass transport regime on the order of seconds, thus providing peak power density of up to 391.85 W/L. Another …
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Using microfluidics and mass spectrometry to study peptide release from neurons
… regarding peptide release by instituting microvalve-controlled collection channels.
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Elektrostatisch angetriebenes 3/2-Wege-Mikroventil für pneumatische Anwendungen
In dieser Arbeit wird nun erstmals die Entwicklung und Herstellung eines 3/2?Wege-Mikroventils beschrieben, welches die Anforderungen der Industriepneumatik erfüllt. Ausgehend von einer Betrachtung des Marktpotentials für Mikroventile in der Pneumatik wird zunächst ein Überblick über die am Markt …
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Electrostatic actuators for portable microfluidic systems
… Others have attempted to modify pneumatic microvalves for portable applications, e.g., by transitioning to electromagnetic, thermopneumatic, or piezoelectric actuation principles. However, none of these strategies maintain the proper balance of simplicity, functionality, and ease of …
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Uv-liga Compatible Electroformed Nano-structured Materials For Micro Mechanical Systems
… large flow rates (>10 cc/s). The fabricated microvalves weigh 0.2 gram, after packing with a novel designated valve stopper. The tested results showed that the micro valve was able to operate at up to 14kHz. This is a great difference in comparison to traditional mechanical valves whose …