Simple and strong: twisted silver painted nylon artificial muscle actuated by Joule heating
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Hunter_Simple and.pdf
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Author(s)
Mirvakili, Seyed Mohammad
Rafie Ravandi, Ali
Haines, Carter S.
Li, Na
Foroughi, Javad
Naficy, Sina
Spinks, Geoffrey M.
Baughman, Ray H.
Madden, John D. W.
Hunter, Ian
Date Issued
March 2014
Journal
Proceedings of SPIE--the International Society for Optical Engineering
Publisher
SPIE
Citation
Mirvakili, Seyed M., Ali Rafie Ravandi, Ian W. Hunter, Carter S. Haines, Na Li, Javad Foroughi, Sina Naficy, Geoffrey M. Spinks, Ray H. Baughman, and John D. W. Madden. “Simple and Strong: Twisted Silver Painted Nylon Artificial Muscle Actuated by Joule Heating.” Edited by Yoseph Bar-Cohen. Electroactive Polymer Actuators and Devices (EAPAD) 2014 (March 8, 2014). © 2014 SPIE
Version
Final published version
Abstract
Highly oriented nylon and polyethylene fibres shrink in length when heated and expand in diameter. By twisting and then coiling monofilaments of these materials to form helical springs, the anisotropic thermal expansion has recently been shown to enable tensile actuation of up to 49% upon heating. Joule heating, by passing a current through a conductive coating on the surface of the filament, is a convenient method of controlling actuation. In previously reported work this has been done using highly flexible carbon nanotube sheets or commercially available silver coated fibres. In this work silver paint is used as the Joule heating element at the surface of the muscle. Up to 29% linear actuation is observed with energy and power densities reaching 840 kJ m[superscript -3] (528 J kg[superscript -1]) and 1.1 kW kg[superscript -1] (operating at 0.1 Hz, 4% strain, 1.4 kg load). This simple coating method is readily accessible and can be applied to any polymer filament. Effective use of this technique relies on uniform coating to avoid temperature gradients.
MIT Department
Massachusetts Institute of Technology. BioInstrumentation Laboratory
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1117/12.2046411
