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Characterization of new surface morphologies in a hydrogen-bonded multilayer system

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dc.contributor.advisor Michael F. Rubner. en_US
dc.contributor.author Kunz, Allison (Allison L.) en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. en_US
dc.date.accessioned 2008-12-11T18:29:46Z
dc.date.available 2008-12-11T18:29:46Z
dc.date.copyright 2008 en_US
dc.date.issued 2008 en_US
dc.identifier.uri http://hdl.handle.net/1721.1/43801
dc.description Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2008. en_US
dc.description Includes bibliographical references (leaf [15]). en_US
dc.description.abstract This work presents an analysis of surface morphology changes in poly(acrylic acid)/polyacrylamide (PAA/PAAm) hydrogen-bonded multilayers. These changes were induced by immersion of the films in aqueous solutions of poly(allylamine hydrochloride), or PAH, at different levels of pH. Positive charges on PAH are attracted to negative charges on PAA, forming ionic bonds and locally decreasing the hydrophilicity of the multilayer. The degree of ionization for each polyelectrolyte, controlled by the pH of the treatment solution, determines the molecular conformations and the extent of electrostatic interactions. These factors, in turn, determine the resulting morphology of the film. Different surface morphologies appeared in four different pH regimes. Highly acidic solutions retained the film's original smooth surface, but wrinkled, honeycomb, or globular morphologies appeared as the pH increased. The three different surface morphologies correlate with the linear, pearl necklace, and globular conformations of PAH. en_US
dc.description.statementofresponsibility by Allison Kunz. en_US
dc.format.extent [23] leaves en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri http://dspace.mit.edu/handle/1721.1/7582 en_US
dc.subject Materials Science and Engineering. en_US
dc.title Characterization of new surface morphologies in a hydrogen-bonded multilayer system en_US
dc.type Thesis en_US
dc.description.degree S.B. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. en_US
dc.identifier.oclc 261503975 en_US


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