Show simple item record

dc.contributor.authorGuo, Qiongen_US
dc.date.accessioned2012-06-06T16:43:01Z
dc.date.available2012-06-06T16:43:01Z
dc.date.issued2012-03-27en_US
dc.identifier.urihttp://hdl.handle.net/1853/43622
dc.description.abstractThis thesis studies the formation of mobile and surface-bound electric charges in nonpolar liquids. Unlike aqueous media with their natural abundance of charged species, liquids of low dielectric constant do not readily accommodate charges, but can do so in the presence of certain surfactant additives. Surfactant-mediated charging in nonpolar oils has long been exploited industrially, but the underlying charging mechanisms are far from understood. The present work seeks clarification by comparing the effect of ionic and nonionic surfactants on the conductivity of nonpolar solutions and the electrophoretically observable surface charge of suspended polymer particles. Both types of surfactant are found to generate mobile ions in solution as well as particle charge; and in the more surprising case of nonionic surfactants, the occurrence of particle charge and screening ions is confirmed independently by measurements of the electrostatic particle interaction energy. A systematic variation of the particle material and functionalization, the residual water content, and the surfactant concentration above and below the critical micelle concentration provides insights about the possible charging pathways. Reverse surfactant micelles are explored not only as charging agents, but also as reactors and templates for the synthesis of novel nanogels with promise for drug delivery. Synthesis via copper-free Click chemistry is shown to allow for better control of the particle size than a more conventional polymerization scheme, while avoiding metal catalysts and free radicals that are considered hazardous for most biomedical applications.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectReverse micelles templated polymerizationen_US
dc.subjectColloidal particles stabilityen_US
dc.subjectElectrostatic interactionsen_US
dc.subjectElectrophoretic mobilityen_US
dc.subjectConductivity in nonpolar mediaen_US
dc.subjectCharge fluctuationen_US
dc.subject.lcshNanogels
dc.subject.lcshNanostructured materials
dc.subject.lcshElectrostatics
dc.titleSurfactants in nonpolar oils: agents of electric charging and nanogel templatesen_US
dc.typeDissertationen_US
dc.description.degreePhDen_US
dc.contributor.departmentChemical Engineeringen_US
dc.description.advisorCommittee Chair: Behrens, Sven; Committee Member: Deng, Yulin; Committee Member: Koros, William; Committee Member: Meredith, Carson; Committee Member: Riedo, Elisaen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record