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Proceedings Paper

Capacitive charging and background processes in carbon nanotube yarn actuators
Author(s): Tissaphern Mirfakhrai; Mikhail Kozlov; Mei Zhang; Shaoli Fang; Ray H. Baughman; John D. W. Madden
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Paper Abstract

Twist-spun carbon nanotube yarns actuate when extra charge is added to the yarn. This charge can be stored in a doublelayer capacitor formed when the yarn is submersed in an electrolyte. The dependence of the actuation stress and strain on the stored charge must be studied if double layer charging models are to be fully verified over large potential ranges. However, background currents are generated in the system when an electrical potential is applied, making it hard to discern the charge stored in the actuator and the charge that passes through the cell due to faradaic processes. A model is developed to separate the capacitive and faradaic portions of the actuator current. The model is then applied to the analysis of the actuation data. The consistency of the results paves the way to understanding the real strain-charge behavior of the actuator.

Paper Details

Date Published: 5 April 2007
PDF: 12 pages
Proc. SPIE 6524, Electroactive Polymer Actuators and Devices (EAPAD) 2007, 65241H (5 April 2007); doi: 10.1117/12.715795
Show Author Affiliations
Tissaphern Mirfakhrai, Univ. of British Columbia (Canada)
Mikhail Kozlov, Univ. of Texas at Dallas (United States)
Mei Zhang, Univ. of Texas at Dallas (United States)
Shaoli Fang, Univ. of Texas at Dallas (United States)
Ray H. Baughman, Univ. of Texas at Dallas (United States)
John D. W. Madden, Univ. of British Columbia (Canada)

Published in SPIE Proceedings Vol. 6524:
Electroactive Polymer Actuators and Devices (EAPAD) 2007
Yoseph Bar-Cohen, Editor(s)

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