Synthesis and characterization of metallic nanoparticles with photoactivated surface chemistries

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dc.contributor.authorAbtahi, Seyyed Mohammad Hosseinen
dc.contributor.committeechairDavis, Richey M.en
dc.contributor.committeememberDucker, William A.en
dc.contributor.committeememberMartin, Stephen M.en
dc.contributor.departmentChemical Engineeringen
dc.date.accessioned2017-06-13T19:43:47Zen
dc.date.adate2014-01-30en
dc.date.available2017-06-13T19:43:47Zen
dc.date.issued2013-12-19en
dc.date.rdate2014-01-30en
dc.date.sdate2013-12-25en
dc.description.abstractDuring recent decades metallic nanoparticles have been found very interesting due to their unique characteristics which make them suitable for different applications. In this research, for the very first time, we tried to perform selective surface photo activation chemistry on the targeted facets of nanoparticles while they are in suspension. This technique enabled us to form desired assemblies of nanoparticles. We focused on elongated shaped gold nanorod due to its unique surface plasmon resonance and probable biomedical applications. In this research we formed a dumbbell shape assembly of nanoparticles in suspension. A probable application for these assemblies can be in vivo imaging. Initially, we reproduced gold nanorods using existing techniques in prior papers and optimized them according to our research needs. A low rpm centrifugal separation technique was developed to efficiently separate synthesized gold nanorods from other shapes. Several characterization techniques were utilized to characterize nanoparticles at each step including UV-absorbance, zeta potential, and dynamic light scattering. Different generations of oligomers were synthesized to be used as gold nanorods coating, and each coating was tested and characterized using appropriate techniques. Our two-step coating replacement method using one of these photocleavable oligomers enabled us to achieve, for the very first time, selective UV photo activation of gold nanorod tips. The photo activated tips were then exposed to oppositely charged gold nanospheres to form dumbbell shape assemblies of gold nanorods and nanospheres. Furthermore, dumbbell shape assembly of nanoparticles was investigated and characterized.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-12252013-091053en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12252013-091053/en
dc.identifier.urihttp://hdl.handle.net/10919/78081en
dc.language.isoen_USen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsurface plasmon resonanceen
dc.subjectPEG (poly ethylene glycol)en
dc.subjectUV photo activationen
dc.subjectphotocleavable oligomeren
dc.subjectsilver nanospheres centrifugal separationen
dc.subjectMetallic nanoparticlesen
dc.subjectgold nanorodsen
dc.subjectgold nanospheresen
dc.subjectUV-Vis absorbanceen
dc.subjectTEM (transmission electron microscopy)en
dc.titleSynthesis and characterization of metallic nanoparticles with photoactivated surface chemistriesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineChemical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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