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An ionic liquid based strain sensor for large displacement measurement

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Abstract

A robust and low cost ionic liquid based strain sensor is fabricated for high strain measurements in biomedical applications (up to 40 % and higher). A tubular 5 mm long silicone microchannel with an inner diameter of 310 µm and an outer diameter of 650 µm is filled with an ionic liquid. Three ionic liquids have been investigated: 1-butyl-1-methylpyrrolidinium bis (trifluoromethylsulfonyl) imide, ethylammonium nitrate and cholinium ethanoate. When the channel is axially stretched, geometrical deformations change the electrical impedance of the liquid channel. The sensors display a linear response and low hysteresis with an average gauge factors of 1.99 for strains up to 40 %. Additionally, to fix the sensor by surgical stitching to soft biological tissue, a sensor with tube clamps consisting of photopatternable SU-8 epoxy-based resin is proposed.

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Acknowledgments

Frederik Ceyssens is a postdoctoral research fellow of FWO-Flanders. Grim Keulemans worked under a Ph.D. grant of the Agency for Innovation by Science and Technology in Flanders (IWT). The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013) / ERC grant agreement n ° 340931.

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  1. KU Leuven, ESAT-MICAS, Kasteelpark Arenberg 10, 3001, Heverlee, Belgium

    Grim Keulemans, Frederik Ceyssens & Robert Puers

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  1. Grim Keulemans
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  2. Frederik Ceyssens
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  3. Robert Puers
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Correspondence to Grim Keulemans.

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Keulemans, G., Ceyssens, F. & Puers, R. An ionic liquid based strain sensor for large displacement measurement. Biomed Microdevices 19, 1 (2017). https://doi.org/10.1007/s10544-016-0141-4

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