Selective Interfacial Interaction between Diblock Copolymers and Cobalt Nanoparticles

dc.contributor.advisor Tannenbaum, Rina
dc.contributor.author David, Kasi en_US
dc.contributor.committeeMember Garmestani, Hamid
dc.contributor.committeeMember Jacob, Karl
dc.contributor.committeeMember SUmmers, Christopher
dc.contributor.department Materials Science and Engineering en_US
dc.date.accessioned 2007-03-27T18:17:07Z
dc.date.available 2007-03-27T18:17:07Z
dc.date.issued 2006-11-20 en_US
dc.description.abstract In order to optimize the synthesis of metal nanoparticle-polymer systems, there are certain processes which must be understood. Perhaps the most important one is the selective interfacial interaction between the block copolymer and the growing metal nanoparticles. To investigate this interaction, four different approaches were taken. The first approach looked at the strength of interaction between the competing blocks of the copolymer and the metal nanoparticles surface. The second approach looked at the effect of polymer architecture on the metal nanoclusters. The third approach looked at the polymer composition and solvent effects on the phase behavior of the metal nanocluster-block copolymer nanocomposite. Finally, the influence of the metal precursor on the rate of the decomposition was examined. It was found that adsorbed layers of PS on the cobalt nanoparticles are completely displaced by PMMA when the solvent is a common good solvent. An adsorbed layer of only PMMA is also obtained through competitive adsorption from a common good solvent. However, in a selective solvent that is poor for PS, sequential adsorption leads to the formation of mixed layers. In homopolymer solutions, the cluster size reaches a minimum at a finite chain MW. In the case of diblock copolymers, the only parameter (for a fixed copolymer concentration) controlling the cluster size in suspensions of di-block copolymers is the molecular weight of one block, in this case PMMA, and is indifferent to other parameters including the molecular weight of the other block (PS) or the solvent quality. It was also found that the spatial distribution of the metal clusters synthesized in-situ coincided with the morphology dictated by thermodynamically-driven microdomain structure of the block copolymer. Moreover, the overall final morphology of the nanocomposite is locked into place while in solution, and fast solvent evaporation does not cause this morphology to change. Finally, results showed that the rate of nanocomposite synthesis occurred faster in the PS suspensions compared to PMMA, indicating that chemical bonds between PMMA and the cobalt nanoclusters slowed the thermal decomposition of the metal precursor. So the PMMA chains provided sites for nucleation, but did not necessarily aid particle growth. en_US
dc.description.degree Ph.D. en_US
dc.format.extent 2625010 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/14029
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Polymer adsorption en_US
dc.subject Metal-polymer nanocomposite en_US
dc.subject Metal nanoparticles en_US
dc.subject Competitive adsorption en_US
dc.subject Diblock copolymers en_US
dc.subject Metal nanoparticle size en_US
dc.title Selective Interfacial Interaction between Diblock Copolymers and Cobalt Nanoparticles en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.corporatename School of Materials Science and Engineering
local.contributor.corporatename College of Engineering
relation.isOrgUnitOfPublication 21b5a45b-0b8a-4b69-a36b-6556f8426a35
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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