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Proceedings Paper

Electrically-activated catheter using polypyrrole actuators: cycling effects
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Paper Abstract

The effect of cycling on charge-storage, actuation and sensing behavior of a polypyrrole is studied, having its application for an electroactive catheter in mind. It is shown that the electrochemical capacitance of a polypyrrole film decreases by about 15 % over the course of 100 cycles, while the per cycle rate of this decrease drops by 75 % between the first and the last ten cycles, implying that a steady-state value may exist. The decrease in capacitance is shown to have a significant effect on actuation strain. In order to achieve a more constant capacitance and more robust actuation performance, it is proposed to pre-cycle the potential of the film to exhaust the effect of processes that contribute to the decrease in capacitance and allow it to reach a more constant value. The ability of a polypyrrole film to generate currents corresponding to applied external load during actuation is verified and the cycle life time of such a sensor is studied. It is shown that after an initial decrease, the sensor current reaches a steady-state value as well, and maintains that value at least over 5600 cycles.

Paper Details

Date Published: 6 April 2009
PDF: 9 pages
Proc. SPIE 7287, Electroactive Polymer Actuators and Devices (EAPAD) 2009, 72871I (6 April 2009); doi: 10.1117/12.816056
Show Author Affiliations
Tissaphern Mirfakhrai, Univ. of British Columbia (Canada)
Tina Shoa, Univ. of British Columbia (Canada)
Niloofar Fekri, Univ. of British Columbia (Canada)
John D. Madden, Univ. of British Columbia (Canada)

Published in SPIE Proceedings Vol. 7287:
Electroactive Polymer Actuators and Devices (EAPAD) 2009
Yoseph Bar-Cohen; Thomas Wallmersperger, Editor(s)

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