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dc.contributor.advisorMichael. F. Rubner.en_US
dc.contributor.authorChoi, Jeeyoung, 1974-en_US
dc.contributor.otherMassachusetts Institute of Technology. Dept. of Materials Science and Engineering.en_US
dc.date.accessioned2006-03-29T18:28:51Z
dc.date.available2006-03-29T18:28:51Z
dc.date.copyright2004en_US
dc.date.issued2004en_US
dc.identifier.urihttp://hdl.handle.net/1721.1/32263
dc.descriptionThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2004.en_US
dc.descriptionIncludes bibliographical references (leaves 126-136).en_US
dc.description.abstractThis thesis investigated the fundamental characteristics of the pH-sensitive behavior of weak polyelectrolytes, such as poly(acrylic acid)(PAA) and poly(allylamine hydrochloride) (PAH) from two perspectives of the assembled multilayers - functional group composition and layer growth. In the first part of this thesis, with respect to the composition control of the functional groups, the assembly conditions to create surfaces that were dominated by specific functional groups were investigated, either to promote or inhibit adsorption of other entities onto the multilayer surfaces. After selective irreversible anchoring, the multilayer surface then acquires the specific physical or chemical properties of the newly incorporated molecules. For example, polystyrene-block-poly(acrylic acid)(PS-PAA) selectively adsorbs to the PAH-rich surfaces of PAA/PAH multilayer films thus rendering the originally hydrophilic PAH-rich regions hydrophobic. Furthermore, by using micro-patterned multilayers via ink-jet printing, two co-existing surface regions that selectively dictate the adsorption behavior of amphiphilic block copolymers were successfully generated. In the second part, the effects of the charge density of weak polyelectrolytes on multilayer growth were quantified by assembling PAA or PAH with several strong polyelectrolytes into multilayers and comparing the results with that of PAA/PAH multilayers.en_US
dc.description.abstract(cont.) Specifically, by using a transmission FT-IR analysis on dried films, the threshold of the charge density where the resulting layer thickness exhibits a sudden incremental change due to a different chain conformation and amount of the adsorbed molecules in the multilayers was identified. Also, the pKa of PAA was revealed to shift by choice of co-assembled polycations within the multilayers, which was expanded to investigation of applications in in-situ synthesis of silver nanoparticles and pH-induced morphological transformation in weak polyelectrolyte multilayers.en_US
dc.description.statementofresponsibilityby Jeeyoung Choi.en_US
dc.format.extent136 leavesen_US
dc.format.extent5694002 bytes
dc.format.extent5691600 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypeapplication/pdf
dc.language.isoengen_US
dc.publisherMassachusetts Institute of Technologyen_US
dc.rightsM.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.urihttp://dspace.mit.edu/handle/1721.1/7582
dc.subjectMaterials Science and Engineering.en_US
dc.titleFundamental studies of pH-sensitivity in polyelectrolyte multilayersen_US
dc.typeThesisen_US
dc.description.degreePh.D.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Dept. of Materials Science and Engineering.en_US
dc.identifier.oclc56025642en_US


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