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Mohsen Shahinpoor with the University of New Mexico |
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Date: October 9, 2003
Time: 10:30am
Location: NIA, Rm 404
Speaker: Mohsen Shahinpoor with the University of New Mexico
Subject: "Ionic Polymer Conductor Composite Materials as Distributed Nanosensors, Nanoactuators and Artificial Muscles - A Review"
In this seminar a summary of the fundamental properties and characteristics of Ionic Polymeric-Conductor (Metal) Composites (IPCC’s and IPMC’s) as distributed biomimetic nanosensors, nanoactuators and artificial muscles is first presented. This summary will include descriptions of the basic materials’ molecular structure, sulfonyl fluoride vinyl ether (SFVE) copolymerization with tetrafluoroethylene (TFE) to form the basic material resin and subsequent hydrolysis to manufacture the basic material for chemical plating and electroactivation. Further described are chemical molecular plating technologies to make IPCC’s and IPMC’s, nanotechnologies of manufacturing and trapping of nanoparticles, SEM, TEM, SPM and AFM characterization of IPCC’s and IPMC’s, biomimetic sensing and actuation characterization techniques, electrical characterization and equivalent circuit modeling of IPCC’s as electronic materials, and manufacturing of 3-D artificial muscles from IPCC’s and IPMC’s. A phenomenological model of the underlying sensing and actuation mechanisms in IPMC’s is next discussed. This modeling is based on linear irreversible thermodynamics with two driving forces, an electric field and a solvent pressure gradient and two fluxes, electric current density and the solvent flux. A recently observed effect called the “electric shape memory effect” in ionic polymers is then presented. This effect establishes that geometrical and deformational information can be permanently preserved in these materials even if the activation electric signal is turned off. Finally, a number of potential industrial, aerospace and medical applications of ionic polymeric-metal composites (IPMC’s) as distributed biomimetic nanosensors, nanoactuators and artificial muscles is presented and followed by a number of live demos of artificial muscles in action, after the seminar.
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