{"id":{"repo_id":"uwo","oai_identifier":"oai:uwo.scholaris.ca:20.500.14721/35355"},"canonical_url":"https://search.dev.ndltd.org/etd/uwo/oai:uwo.scholaris.ca:20.500.14721/35355","repository":{"repo_id":"uwo","name":"Western University","base_url":"https://uwo.scholaris.ca/server/oai/request"},"display":{"title":"Photochromic Molecular Materials for the Controlled Organization of Nanoparticles","abstract":"The displacement of polystyrene nanoparticles promoted by bulk azo mass transfer using interferential light illumination will be discussed. For this a variety of different push pull small azo molecules were synthesis and characterized, changing the polarity, hydrophobicity and bulky groups around the azo moiety. These small dyes appear to orientate quicker than similarly report azo polymers, of entanglement of the azobenzene group in the polymeric backbone. These dyes were used to form surface relief grating on the thin films due to the bulk mass transfer. This mass transfer was exploited to align polystyrene nanoparticles in the crests and troughs of the gratings. Secondly, the fabrication of azo nano objects will be discussed, here the photochromic studies showed the azo nanospheres had a larger photochemical conversion then their corresponding thin films. These nanoobjects were then successfully coated with gold nanoparticles by using azo compounds with dithiane or thioacetate ligands that are known to complex gold. The hybrid structure was proved by Raman spectroscopy where surface enhanced resonance effects have been evidenced upon excitation in the gold localized surface plasmon bands. Such assemblies, following a reverse architecture as the azo is situated in the core and not on the periphery, represents the first example of high-payload photochromic nanoparticles.","abstract_html":"The displacement of polystyrene nanoparticles promoted by bulk azo mass transfer using interferential light illumination will be discussed. For this a variety of different push pull small azo molecules were synthesis and characterized, changing the polarity, hydrophobicity and bulky groups around the azo moiety. These small dyes appear to orientate quicker than similarly report azo polymers, of entanglement of the azobenzene group in the polymeric backbone. These dyes were used to form surface relief grating on the thin films due to the bulk mass transfer. This mass transfer was exploited to align polystyrene nanoparticles in the crests and troughs of the gratings. Secondly, the fabrication of azo nano objects will be discussed, here the photochromic studies showed the azo nanospheres had a larger photochemical conversion then their corresponding thin films. These nanoobjects were then successfully coated with gold nanoparticles by using azo compounds with dithiane or thioacetate ligands that are known to complex gold. The hybrid structure was proved by Raman spectroscopy where surface enhanced resonance effects have been evidenced upon excitation in the gold localized surface plasmon bands. Such assemblies, following a reverse architecture as the azo is situated in the core and not on the periphery, represents the first example of high-payload photochromic nanoparticles.","abstract_has_math":false,"creators":["Snell, Kristen Elise"],"institution":"The University of Western Ontario","degree_name":"Ph D","degree_level":null,"degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":[],"advisors":["Eléna Ishow","François Lagugné-Labarthet"],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014","date_published":"2014","updated_at":"2026-07-27T21:55:56Z","subjects":["Photochromic materials","photo organization","nanoparticles","nanohybrids","polystyrene nanoparticles","gold nanoparticles"],"languages":["en_ca"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/20.500.14721/35355","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Eléna Ishow","François Lagugné-Labarthet"]},{"key":"dc:creator","label":"Author","values":["Snell, Kristen Elise"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-07-10T20:37:04Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-07-10T20:37:04Z"]},{"key":"dc:date.issued","label":"Date","values":["2014"]},{"key":"dc:publisher","label":"Institution","values":["The University of Western Ontario"]},{"key":"dc:type","label":"Dc Type","values":["thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph D"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Photochromic materials","photo organization","nanoparticles","nanohybrids","polystyrene nanoparticles","gold nanoparticles"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_ca"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/20.500.14721/35355"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The thesis cover page in the PDF document includes references to Western University’s previous institutional repository platform, known as Scholarship@Western, and links to that platform (beginning with ir.lib.uwo.ca). In citing or referring to this thesis, use the DOI or handle from this page instead. Sample citation: Author name, \"Thesis title.\" (Year). Western University Open Repository. https://doi.org/10.71858/123456."]},{"key":"dc:description.abstract","label":"Abstract","values":["The displacement of polystyrene nanoparticles promoted by bulk azo mass transfer using interferential light illumination will be discussed. For this a variety of different push pull small azo molecules were synthesis and characterized, changing the polarity, hydrophobicity and bulky groups around the azo moiety. These small dyes appear to orientate quicker than similarly report azo polymers, of entanglement of the azobenzene group in the polymeric backbone. These dyes were used to form surface relief grating on the thin films due to the bulk mass transfer. This mass transfer was exploited to align polystyrene nanoparticles in the crests and troughs of the gratings. Secondly, the fabrication of azo nano objects will be discussed, here the photochromic studies showed the azo nanospheres had a larger photochemical conversion then their corresponding thin films. These nanoobjects were then successfully coated with gold nanoparticles by using azo compounds with dithiane or thioacetate ligands that are known to complex gold. The hybrid structure was proved by Raman spectroscopy where surface enhanced resonance effects have been evidenced upon excitation in the gold localized surface plasmon bands. Such assemblies, following a reverse architecture as the azo is situated in the core and not on the periphery, represents the first example of high-payload photochromic nanoparticles."]},{"key":"dc:title","label":"Title","values":["Photochromic Molecular Materials for the Controlled Organization of Nanoparticles"]}]}],"canonical_facts":{"dc:contributor.advisor":["Eléna Ishow","François Lagugné-Labarthet"],"dc:creator":["Snell, Kristen Elise"],"dc:date.accessioned":["2025-07-10T20:37:04Z"],"dc:date.available":["2025-07-10T20:37:04Z"],"dc:date.issued":["2014"],"dc:description":["The thesis cover page in the PDF document includes references to Western University’s previous institutional repository platform, known as Scholarship@Western, and links to that platform (beginning with ir.lib.uwo.ca). In citing or referring to this thesis, use the DOI or handle from this page instead. Sample citation: Author name, \"Thesis title.\" (Year). Western University Open Repository. https://doi.org/10.71858/123456."],"dc:description.abstract":["The displacement of polystyrene nanoparticles promoted by bulk azo mass transfer using interferential light illumination will be discussed. For this a variety of different push pull small azo molecules were synthesis and characterized, changing the polarity, hydrophobicity and bulky groups around the azo moiety. These small dyes appear to orientate quicker than similarly report azo polymers, of entanglement of the azobenzene group in the polymeric backbone. These dyes were used to form surface relief grating on the thin films due to the bulk mass transfer. This mass transfer was exploited to align polystyrene nanoparticles in the crests and troughs of the gratings. Secondly, the fabrication of azo nano objects will be discussed, here the photochromic studies showed the azo nanospheres had a larger photochemical conversion then their corresponding thin films. These nanoobjects were then successfully coated with gold nanoparticles by using azo compounds with dithiane or thioacetate ligands that are known to complex gold. The hybrid structure was proved by Raman spectroscopy where surface enhanced resonance effects have been evidenced upon excitation in the gold localized surface plasmon bands. Such assemblies, following a reverse architecture as the azo is situated in the core and not on the periphery, represents the first example of high-payload photochromic nanoparticles."],"dc:identifier.uri":["https://hdl.handle.net/20.500.14721/35355"],"dc:language.iso":["en_ca"],"dc:publisher":["The University of Western Ontario"],"dc:subject":["Photochromic materials","photo organization","nanoparticles","nanohybrids","polystyrene nanoparticles","gold nanoparticles"],"dc:title":["Photochromic Molecular Materials for the Controlled Organization of Nanoparticles"],"dc:type":["thesis"],"thesis:degree_discipline":["Chemistry"],"thesis:degree_name":["Ph D"]},"updated_at":"2026-07-27T21:55:56Z"}