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Proceedings Paper

Polypyrrol/chitosan hydrogel hybrid microfiber as sensing artificial muscle
Author(s): Yahya A. Ismail; Jose G. Martínez; Ahmad S. Al Harrasi; Seon J. Kim; Toribio F. Fernández Otero
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Paper Abstract

An electrochemical actuator demands that it should act as a sensor of the working conditions for its efficient application in devices. Actuation and sensing characteristics of a biopolymer/conducting polymer hybrid microfiber artificial muscle fabricated through wet spinning of a chitosan solution followed by in situ chemical polymerization with pyrrol employing bis(triflouro methane sulfonyl) imide as dopant and ferric chloride as a catalyst is presented. The polypyrrol/chitosan hybrid microfiber was investigated by FTIR, scanning electron microscopy (SEM), electrical conductivity measurement, cyclic voltammetric and chronopotentiometric methods. The electrochemical measurements related to the sensing abilities were performed as a function of applied current, concentration and temperature keeping two of the variables constant at a given time using NaCl as electrolyte. Cyclic voltammograms confirmed that the electro activity is imparted by polypyrrol (pPy). The fiber showed an electrical conductivity of 3.21x10-1 Scm-1and an average linear electrochemical actuation strain of 0.54%. The chronopotentiometric responses during the oxidation/reduction processes of the microfiber for the different anodic/cathodic currents and the linear fit observed for the consumed electrical energy during the reaction for various applied currents suggested that it can act as a sensor of applied current. The chronopotentiometric responses and the linear fit of consumed electrical energy at different temperatures suggested that the actuator can act as a temperature sensor. Similarly a semi logarithmic dependence of the consumed electrical energy with concentration of the electrolyte during reaction is suggestive of its applicability as a concentration sensor. The demand that an electrochemical actuator to be a sensor of the working conditions, for its efficient application in devices is thus verified in this material.

Paper Details

Date Published: 28 March 2011
PDF: 12 pages
Proc. SPIE 7976, Electroactive Polymer Actuators and Devices (EAPAD) 2011, 79761L (28 March 2011); doi: 10.1117/12.879799
Show Author Affiliations
Yahya A. Ismail, Univ. of Nizwa (Oman)
Jose G. Martínez, Univ. Politécnica de Cartagena (Spain)
Ahmad S. Al Harrasi, Univ. of Nizwa (Oman)
Seon J. Kim, Hanyang Univ. (Korea, Republic of)
Toribio F. Fernández Otero, Univ. Politécnica de Cartagena (Spain)

Published in SPIE Proceedings Vol. 7976:
Electroactive Polymer Actuators and Devices (EAPAD) 2011
Yoseph Bar-Cohen; Federico Carpi, Editor(s)

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