Actuation and Charge Transport Modeling of Ionic Liquid-Ionic Polymer Transducers

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dc.contributor.authorDavidson, Jacob Danielen
dc.contributor.committeechairGoulbourne, Nakhiah C.en
dc.contributor.committeememberBatra, Romesh C.en
dc.contributor.committeememberLeo, Donalden
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:31:42Zen
dc.date.adate2010-03-15en
dc.date.available2014-03-14T20:31:42Zen
dc.date.issued2010-01-28en
dc.date.rdate2010-03-15en
dc.date.sdate2010-02-10en
dc.description.abstractIonic polymer transducers (IPTs) are soft sensors and actuators which operate through a coupling of micro-scale chemical, electrical, and mechanical mechanisms. The use of ionic liquid as solvent for an IPT has been shown to dramatically increase transducer lifetime in free-air use, while also allowing for higher applied voltages without electrolysis. This work aims to further the understanding of the dominant mechanisms of IPT actuation and how these are affected when an ionic liquid is used as solvent. A micromechanical model of IPT actuation is developed following a previous approach given by Nemat-Nasser, and the dominant relationships in actuation are demonstrated through an analysis of electrostatic cluster interactions. The elastic modulus of Nafion as a function of ionic liquid uptake is measured using uniaxial tension tests and modeled in a micromechanical framework, showing an excellent fit to the data. Charge transport is modeled by considering both the cation and anion of the ionic liquid as mobile charge carriers, a phenomenon which is unique to ionic liquid IPTs as compared to their water-based counterparts. Numerical simulations are performed using the finite element method, and a modified theory of ion transport is discussed which can be extended to accurately describe electrochemical migration of ionic liquid ions at higher applied voltages. The results presented here demonstrate the dominant mechanisms of IPT actuation and identify those unique to ionic liquid IPTs, giving directions for future research and transducer development.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-02102010-160245en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02102010-160245/en
dc.identifier.urihttp://hdl.handle.net/10919/31204en
dc.publisherVirginia Techen
dc.relation.haspartDavidson_JD_T_2010.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectNafionen
dc.subjectionic polymer-metal compositeen
dc.subjectIonic polymer transduceren
dc.subjectelectroactive polymeren
dc.subjectionic polymeren
dc.subjectionic liquiden
dc.titleActuation and Charge Transport Modeling of Ionic Liquid-Ionic Polymer Transducersen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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