Materials challenges for repeatable RF wireless device reconfiguration with microfluidic channels

Anthony S. Griffin, Nancy R. Sottos, Scott R. White

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Recently, adaptive wireless devices have utilized displacement of EGaIn within microchannels as an electrical switching mechanism to enable reconfigurable electronics. Device reconfiguration using EGaIn in microchannels overcomes many challenges encountered by more traditional reconfiguration mechanisms such as diodes and microelectromechanical systems (MEMS). Reconfiguration using EGaIn is severely limited by undesired permanent shorting due to retention of the liquid in microchannels caused by wetting and rapid oxide skin formation. Here, we investigate the conditions which prevent repeatable electrical switching using EGaIn in microchannels. Initial contact angle tests of EGaIn on epoxy surfaces demonstrate the wettability of EGaIn on flat surfaces. SEM cross-sections of microchannels reveal adhesion of EGaIn residue to channel walls. Micro-computed tomography (microCT) scans of provide volumetric measurements of EGaIn remaining inside channels after flow cycling. Non-wetting coatings are proposed as materials based strategy to overcome these issues in future work.

Original languageEnglish (US)
Title of host publicationBehavior and Mechanics of Multifunctional Materials and Composites XII
EditorsHani E. Naguib
PublisherSPIE
ISBN (Electronic)9781510616882
DOIs
StatePublished - Jan 1 2018
EventBehavior and Mechanics of Multifunctional Materials and Composites XII 2018 - Denver, United States
Duration: Mar 5 2018Mar 8 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10596
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherBehavior and Mechanics of Multifunctional Materials and Composites XII 2018
CountryUnited States
CityDenver
Period3/5/183/8/18

Keywords

  • EGaIn
  • Liquid metal
  • Microfluidics
  • Reconfigurable antennas

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Griffin, A. S., Sottos, N. R., & White, S. R. (2018). Materials challenges for repeatable RF wireless device reconfiguration with microfluidic channels. In H. E. Naguib (Ed.), Behavior and Mechanics of Multifunctional Materials and Composites XII [1059611] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10596). SPIE. https://doi.org/10.1117/12.2300264