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Proceedings Paper

Novel self-powered pH indicator using ionic polymeric gel muscles
Author(s): Mohsen Shahinpoor
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Paper Abstract

A novel design for a torsional spring-loaded pH indicator using ionic polymeric gel fibrous muscles is presented. The essential parts of the proposed self-powered pH indicator are a pair of co-axial and concentric cylinders, an assembly of fibrous polyacrylonitrile (PAN) muscles, a torsional spring, and a dial indicator. The two co-axial cylinders are such that the inner cylinder may pivotally rotate about the central rotation axis that is fixed to the inner bottom or side of the outer cylinder. The outer cylinder also serves as a reservoir for any liquid whose pH is to be determined either statically or dynamically. The internal cylindrical drum is further equipped with a dial indicator on one of its outer end caps such that when a pH environment is present the contraction or expansion of the PAN fibers cause the inner drum to rotate and thus give a reading of the dial indicator. The motion of the dial indicator may also be converted to an electrical signal (voltage) for digital electronics display and computer control. A mathematical model is also presented for the dynamic response of the self-powered pH indicator made with contractile PAN fiber bundle assemblies.

Paper Details

Date Published: 1 May 1994
PDF: 9 pages
Proc. SPIE 2189, Smart Structures and Materials 1994: Smart Materials, (1 May 1994); doi: 10.1117/12.174050
Show Author Affiliations
Mohsen Shahinpoor, Univ. of New Mexico (United States)


Published in SPIE Proceedings Vol. 2189:
Smart Structures and Materials 1994: Smart Materials
Vijay K. Varadan, Editor(s)

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