Normally closed plunger-membrane microvalve self-actuated electrically using a shape memory alloy wire
| Autor: | Gene Y. Fridman, Chaojun Cheng, Raviraj Thakur, Ankitha Rajagopalan Nair |
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| Rok vydání: | 2018 |
| Předmět: |
Plunger
Materials science business.industry 010401 analytical chemistry Microfluidics 02 engineering and technology Shape-memory alloy 021001 nanoscience & nanotechnology Condensed Matter Physics Elastomer 01 natural sciences Article 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound Reliability (semiconductor) Silicone chemistry Nickel titanium Materials Chemistry Optoelectronics Current (fluid) 0210 nano-technology business |
| Zdroj: | Microfluidics and Nanofluidics. 22 |
| ISSN: | 1613-4990 1613-4982 |
| DOI: | 10.1007/s10404-018-2049-1 |
| Popis: | Various microfluidic architectures designed for in vivo and point-of-care diagnostic applications require larger channels, autonomous actuation, and portability. In this paper, we present a normally closed microvalve design capable of fully autonomous actuation for wide diameter microchannels (tens to hundreds of μm). We fabricated the multilayer plunger-membrane valve architecture using the silicone elastomer, poly-dimethylsiloxane (PDMS) and optimized it to reduce the force required to open the valve. A 50-μm Nitinol (NiTi) shape memory alloy wire is incorporated into the device and can operate the valve when actuated with 100-mA current delivered from a 3-V supply. We characterized the valve for its actuation kinetics using an electrochemical assay and tested its reliability at 1.5-s cycle duration for 1 million cycles during which we observed no operational degradation. |
| Databáze: | OpenAIRE |
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