Normally closed plunger-membrane microvalve self-actuated electrically using a shape memory alloy wire

Chaojun Cheng, Ankitha Rajagopalan Nair, Raviraj Thakur, Gene Fridman

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Article number29
JournalMicrofluidics and Nanofluidics
Volume22
Issue number3
DOIs
StatePublished - Mar 1 2018

Keywords

  • Nitinol
  • PDMS
  • Point-of-care
  • Self-actuated
  • Valve

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Normally closed plunger-membrane microvalve self-actuated electrically using a shape memory alloy wire'. Together they form a unique fingerprint.

Cite this