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Novel routes to metal nanoparticles : electrodeposition and reactions at liquid-liquid interfaces

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Johans, Christoffer
dc.date.accessioned 2012-02-10T08:45:28Z
dc.date.available 2012-02-10T08:45:28Z
dc.date.issued 2003-04-26
dc.identifier.isbn 951-22-6468-4
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2079
dc.description.abstract This thesis considers the nucleation and growth, synthesis, and catalytic application of metallic nanoparticles at liquid|liquid interfaces. It comprises five publications, a previously unpublished synthesis of polymer coated palladium nanoparticles, and an introduction to the relevant literature. Three publications are concerned with electrodeposition of metal nanoparticles at liquid|liquid interfaces. One publication and the results presented here consider the synthesis of silver and palladium colloids by reduction with pyrrole and thiophene monomers. The fifth publication demonstrates the use of gold and palladium colloids as electrocatalysts in two-phase dehalogenation reactions. The literature reviewed serves as an introduction to nanoparticles, liquid|liquid interfaces and electrodeposition studies relevant to the publications and experimental studies presented herein. Nucleation models used are evaluated by numerical means. In the electrodeposition studies, the fundamentals of deposition reactions at liquid|liquid interfaces, involving irreversible Butler-Volmer type growth kinetics and overlap of diffusion fields are developed. The importance of applied potential, particle agglomeration and surface activity on the nucleation process is shown. Small metallic nanoparticles were synthesized in homogeneous media, using novel syntheses involving pyrrole and thiophene derivatives as both reductants and stabilizators. The use of aqueous metal colloids as catalysts for dehalogenation reactions in a two-phase immiscible electrolyte system is demonstrated. Specifically palladium or gold colloids prepared by the citrate reduction method can be negatively charged in a heterogenous two-phase reaction with decamethylferrocene, and subsequently used as an aqueous catalyst for dehalogenation of 2-bromoacetophenone. en
dc.format.extent 49, [31]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.haspart Johans C., Lahtinen R., Kontturi K. and Schiffrin D. J., 2000. Nucleation at liquid|liquid interfaces: electrodeposition without electrodes. Journal of Electroanalytical Chemistry 488, pages 99-109. [article1.pdf] © 2000 Elsevier Science. By permission.
dc.relation.haspart Johans C., Kontturi K. and Schiffrin D. J., 2002. Nucleation at liquid|liquid interfaces: galvanostatic study. Journal of Electroanalytical Chemistry 526, pages 29-35. [article2.pdf] © 2002 Elsevier Science. By permission.
dc.relation.haspart Johans C., Liljeroth P. and Kontturi K., 2002. Electrodeposition at polarisable liquid|liquid interfaces: The role of interfacial tension on nucleation kinetics. Physical Chemistry Chemical Physics 4, pages 1067-1071.
dc.relation.haspart Johans C., Clohessy J., Fantini S., Kontturi K. and Cunnane V. J., 2002. Electrosynthesis of polyphenylpyrrole coated silver particles at a liquid-liquid interface. Electrochemistry Communications 4, pages 227-230. [article4.pdf] © 2002 Elsevier Science. By permission.
dc.relation.haspart Lahtinen R., Johans C., Hakkarainen S., Coleman D. and Kontturi K., 2002. Two-phase electrocatalysis by aqueous colloids. Electrochemistry Communications 4, pages 479-482. [article5.pdf] © 2002 Elsevier Science. By permission.
dc.subject.other Chemistry en
dc.subject.other Physics en
dc.title Novel routes to metal nanoparticles : electrodeposition and reactions at liquid-liquid interfaces en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Chemical Technology en
dc.contributor.department Kemian tekniikan osasto fi
dc.subject.keyword metallic nanoparticles en
dc.subject.keyword liquid|liquid interfaces en
dc.subject.keyword nucleation en
dc.subject.keyword growth en
dc.subject.keyword synthesis en
dc.subject.keyword catalytic applications en
dc.subject.keyword palladium nanoparticles en
dc.subject.keyword electrodeposition en
dc.identifier.urn urn:nbn:fi:tkk-000470
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.lab Laboratory of Physical Chemistry and Electrochemistry en
dc.contributor.lab Fysikaalisen kemian ja sähkökemian laboratorio fi

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