Soft Elastomers with Ionic Liquid-Filled Cavities as Strain Isolating Substrates for Wearable Electronics

Yinji Ma, Matt Pharr, Liang Wang, Jeonghyun Kim, Yuhao Liu, Yeguang Xue, Rui Ning, Xiufeng Wang, Ha Uk Chung, Xue Feng, John A. Rogers, Yonggang Huang

Research output: Contribution to journalArticle

  • 10 Citations

Abstract

Managing the mechanical mismatch between hard semiconductor components and soft biological tissues represents a key challenge in the development of advanced forms of wearable electronic devices. An ultralow modulus material or a liquid that surrounds the electronics and resides in a thin elastomeric shell provides a strain-isolation effect that enhances not only the wearability but also the range of stretchability in suitably designed devices. The results presented here build on these concepts by (1) replacing traditional liquids explored in the past, which have some nonnegligible vapor pressure and finite permeability through the encapsulating elastomers, with ionic liquids to eliminate any possibility for leakage or evaporation, and (2) positioning the liquid between the electronics and the skin, within an enclosed, elastomeric microfluidic space, but not in direct contact with the active elements of the system, to avoid any negative consequences on electronic performance. Combined experimental and theoretical results establish the strain-isolating effects of this system, and the considerations that dictate mechanical collapse of the fluid-filled cavity. Examples in skin-mounted wearable include wireless sensors for measuring temperature and wired systems for recording mechano-acoustic responses.

LanguageEnglish (US)
Article number1602954
JournalSmall
Volume13
Issue number9
DOIs
StatePublished - Mar 7 2017

Fingerprint

Elastomers
Ionic Liquids
Ionic liquids
Vapor Pressure
Equipment and Supplies
Skin
Semiconductors
Microfluidics
Liquids
Electronic equipment
Substrates
Acoustics
Permeability
Leakage (fluid)
Vapor pressure
Contacts (fluid mechanics)
Temperature
Evaporation
Tissue
Semiconductor materials

Keywords

  • flexible electronics
  • ionic liquid
  • stretchable electronics
  • wearable electronics

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Engineering (miscellaneous)

Cite this

Ma, Yinji ; Pharr, Matt ; Wang, Liang ; Kim, Jeonghyun ; Liu, Yuhao ; Xue, Yeguang ; Ning, Rui ; Wang, Xiufeng ; Chung, Ha Uk ; Feng, Xue ; Rogers, John A. ; Huang, Yonggang. / Soft Elastomers with Ionic Liquid-Filled Cavities as Strain Isolating Substrates for Wearable Electronics. In: Small. 2017 ; Vol. 13, No. 9.
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Ma, Y, Pharr, M, Wang, L, Kim, J, Liu, Y, Xue, Y, Ning, R, Wang, X, Chung, HU, Feng, X, Rogers, JA & Huang, Y 2017, 'Soft Elastomers with Ionic Liquid-Filled Cavities as Strain Isolating Substrates for Wearable Electronics' Small, vol. 13, no. 9, 1602954. DOI: 10.1002/smll.201602954

Soft Elastomers with Ionic Liquid-Filled Cavities as Strain Isolating Substrates for Wearable Electronics. / Ma, Yinji; Pharr, Matt; Wang, Liang; Kim, Jeonghyun; Liu, Yuhao; Xue, Yeguang; Ning, Rui; Wang, Xiufeng; Chung, Ha Uk; Feng, Xue; Rogers, John A.; Huang, Yonggang.

In: Small, Vol. 13, No. 9, 1602954, 07.03.2017.

Research output: Contribution to journalArticle

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AU - Pharr,Matt

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AU - Liu,Yuhao

AU - Xue,Yeguang

AU - Ning,Rui

AU - Wang,Xiufeng

AU - Chung,Ha Uk

AU - Feng,Xue

AU - Rogers,John A.

AU - Huang,Yonggang

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Y1 - 2017/3/7

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Ma Y, Pharr M, Wang L, Kim J, Liu Y, Xue Y et al. Soft Elastomers with Ionic Liquid-Filled Cavities as Strain Isolating Substrates for Wearable Electronics. Small. 2017 Mar 7;13(9). 1602954. Available from, DOI: 10.1002/smll.201602954