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dc.contributor.authorShim, Hyun Kien
dc.date2016-02-20 20:27:20.46
dc.date.accessioned2016-02-25T21:44:22Z
dc.date.available2016-02-25T21:44:22Z
dc.date.issued2016-02-25
dc.identifier.urihttp://hdl.handle.net/1974/14080
dc.descriptionThesis (Master, Chemical Engineering) -- Queen's University, 2016-02-20 20:27:20.46en
dc.description.abstractThis thesis is focused on the water uptake and swelling properties of sub-micron thin ion conducting polymer (ionomer) films. One motivation for this work stems from the need to resolve the discrepancy between high water uptake and low proton conductivity properties observed in Nafion® thin films on SiO2 substrate. In addition, the effects of film thickness, substrate, ionomer equivalent weight (EW), and annealing on the intrinsic properties of ionomer thin films were studied. Ionomer thin films were characterized using the quartz crystal microbalance (QCM) and ellipsometry for their density, refractive index (RI), water uptake and swelling properties. Water uptake studies showed that the effect of substrate on water uptake of Nafion® thin films were not as strong as expected. Meanwhile, a thickness-dependent water uptake was observed for Nafion® thin films. Similar trends were observed for the two low EW ionomers suggesting similar nano-structure in the thin film form. Interestingly, comparison of water uptake showed that low EW ionomers adsorb comparable or less water than Nafion in the thin film form. A combined QCM and ellipsometer setup was employed for the first time to simultaneously measure the water uptake and swelling, respectively as a function of humidity. All thin films appear to be affected by confinement effect as evident by the swelling dimension and volume of mixing. Thermally annealed (160 oC) Nafion® thin films experienced a significant decrease in water uptake and swelling properties.en
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectQCMen
dc.subjectPEMFCen
dc.subjectWater uptakeen
dc.subjectSwellingen
dc.subjectPolymeren
dc.subjectThin filmen
dc.subjectNafionen
dc.titleWater Sorption Properties of Sub-Micron Thin Ionomer Filmsen
dc.typethesisen
dc.description.degreeM.A.Sc.en
dc.contributor.supervisorKaran, Kunalen
dc.contributor.departmentChemical Engineeringen
dc.degree.grantorQueen's University at Kingstonen


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