Univ., Diss.--Köln, 1997.

Thesis (M.H.A.)--University of Michigan, 1966.

Thesis (M.H.A.)--University of Michigan, 1964.

Thesis (M.H.A.)--University of Michigan, 1966.

Thesis (M.H.A.)--University of Michigan, 1964.

Made available in DSpace on 2014-06-11T19:27:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-08-20Bitstream added on 2014-06-13T19:35:04Z : No. of bitstreams: 1 silva_ml_me_bauru.pdf: 1014691 bytes, checksum: d6234b7cfd38238526074b3a223731a8 (MD5) / Neste trabalho investigaram-se a fabricação dos filmes de Langmuir e de filmes Langmuir-Blodgett (LB) mistos obtidos do azopolímero poli(metacrilato de lauroila-cometacrilato de DR1) com estearato de cádmio (StCd). A fabricação dos filmes LB desse azopolímero somente foi possível utilizando-se o StCd como suporte molecular. A caracterização espectroscópica dos filmes LB foi feita através de espectroscopia de absorção no UV-Visível e no infravermelho. As medidas de birrefringência fotoinduzida dos filmes LB mistos do azopolímero com StCd foram feitas em função do tempo durante a formação da birrefringência e no decaimento após a luz de excitação ter sido desligada. Os resultados experimentais obtidos nas medidas mostraram que a amplitude máxima da birrefringência obtida durante a excitação aumenta com a intensidade da luz de excitação e o número de camadas dos filmes LB. Foi também estudada a dinâmica da formação e do decaimento determinando-se as constantes de tempo dos processos de orientação usando funções biexponenciais do modelo de Sekkat / Fabrication of Langmuir and Langmuir-Blodgett (LB) mixed films of poly(lauroyl-methacrylate co-DR1 methacrylate) and cadmium stearate (CdSt) were investigated. The fabrication of LB films from this azopolymer was achieved only if CdSt molecular support is used. Spectroscopic characterization of films were performed by means of UV-Vis and infrared measurements. Photoinduced birefringence measurements of LB mixed films of azopolymer with CdSt were performed as function of time during the buildup of the birefringence and the decay after turning off the excitation light. Experimental results showed that the maximum birefringence achieved during the light excitation increased with the number of layers of the LB film and light intensity. Photoinduced birefringence dynamics was also investigated during the buildup and decay aiming to determine the time constants of bi-exponential functions given by the Sekkat model

Orientador: José Alberto Giacometti / Banca: José Leonil Duarte / Banca: Neri Alves / O Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, PosMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi da Unesp / Resumo: Neste trabalho investigaram-se a fabricação dos filmes de Langmuir e de filmes Langmuir-Blodgett (LB) mistos obtidos do azopolímero poli(metacrilato de lauroila-cometacrilato de DR1) com estearato de cádmio (StCd). A fabricação dos filmes LB desse azopolímero somente foi possível utilizando-se o StCd como suporte molecular. A caracterização espectroscópica dos filmes LB foi feita através de espectroscopia de absorção no UV-Visível e no infravermelho. As medidas de birrefringência fotoinduzida dos filmes LB mistos do azopolímero com StCd foram feitas em função do tempo durante a formação da birrefringência e no decaimento após a luz de excitação ter sido desligada. Os resultados experimentais obtidos nas medidas mostraram que a amplitude máxima da birrefringência obtida durante a excitação aumenta com a intensidade da luz de excitação e o número de camadas dos filmes LB. Foi também estudada a dinâmica da formação e do decaimento determinando-se as constantes de tempo dos processos de orientação usando funções biexponenciais do modelo de Sekkat / Abstract: Fabrication of Langmuir and Langmuir-Blodgett (LB) mixed films of poly(lauroyl-methacrylate co-DR1 methacrylate) and cadmium stearate (CdSt) were investigated. The fabrication of LB films from this azopolymer was achieved only if CdSt molecular support is used. Spectroscopic characterization of films were performed by means of UV-Vis and infrared measurements. Photoinduced birefringence measurements of LB mixed films of azopolymer with CdSt were performed as function of time during the buildup of the birefringence and the decay after turning off the excitation light. Experimental results showed that the maximum birefringence achieved during the light excitation increased with the number of layers of the LB film and light intensity. Photoinduced birefringence dynamics was also investigated during the buildup and decay aiming to determine the time constants of bi-exponential functions given by the Sekkat model / Mestre

Made available in DSpace on 2014-06-11T19:30:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-02-15Bitstream added on 2014-06-13T20:00:21Z : No. of bitstreams: 1 aoki_phb_me_bauru.pdf: 3726182 bytes, checksum: c582cd9cf1e3d2f3af8f65685764355e (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / A presente dissertação de mestrado trata da fabricação de filmes ultrafinos (nanômetros de espessura) de fosfolipídios aniônicos (DPPG e CLP) e zwiteriônicos (DPPC e DOPC) utilizando as técnicas layer-by-layer (LbL) e Langmuir-Blodgett (LB), possibilitando assim a obtenção de filmes com diferentes arquiteturas moleculares. O objetivo principal foi explorar a aplicação destas diferentes arquiteturas moleculares na detecção do fármaco fenotiazínico azul de metileno (AM) em soluções diluídas. O crescimento linear, camada por camada, desses filmes foi verificado e monitorado por espectroscopia de absorção no UV-Vis. Verificou-se por FTIR que o crescimento dos filmes LbL e LB é determinado por interações eletrostáticas entre os fosfolipídios e o polieletrólito catiônico PAH utilizado como camada de suporte, favorecendo o crescimento dos filmes com fosfolipídios aniônicos. A morfologia foi analisada através de microscopias ópticas, AFM e MEV, revelando que os fosfolipídios estruturam-se como vesículas nos filmes LbL e monocamadas nos filmes LB. Filmes LbL e LB de fosfolipídios com diferentes espessuras foram então depositados sobre eletrodos interdigitados de Pt formando unidades sensoriais que foram aplicadas na detecção de AM via espectroscopia de impedância. Os resultados mostraram que as diferentes arquiteturas moleculares dos filmes LbL e LB levam a respostas elétricas distintas e permitem a detecção de AM em concentrações de nanomolar. A técnica SERS foi utilizada para obter informações estruturais do sistema AM/fosfolipídios nos níveis de diluição alcançados via espectroscopia de impedância. Para tanto, monocamadas LB foram depositados sobre filmes evaporados com 6 nm de Ag e nanopartículas de Ag foram dispersas no interior dos filmes LbL. A presença da Ag na forma de nanopartículas em ambos os casos permitiu a obtenção... / Thin films of anionic (DPPG and CLP) and zwiterionic (DPPC and DOPC) phospholipids with different molecular architectures were fabricated using the layer-by-layer (LbL) and Langmuir-Blodgett (LB) techniques. The main goal of this work was to explore the Application of these distinct molecular architectures in the detection of high diluted solutions of methylene blue (MB), a phenothiazine derivative drug. The linear growth, layer by layer, of these films was verified and monitored by UV-Vis absorption spectroscopy. It was found by FTIR that electrostatic interactions among the phosholipids and the supporting layer of PAH (cationic electrolyte) are the main driving force allowing the growth of the LbL and LB films, which favors the growth of the cationic phospholipids. The morphology was analyzed through optical microscopy, AFM and SEM, revealing that the phospholipids are structured as vesicles in the LbL films and as monolayers in the LB films. Different thickness of LbL and as monolayers in the LB filma containing phospholipids were deposited onto Pt interdigitated electrodes forming sensingn units applied in the detection of MB using impedance spectroscopy. The results showed that the different molecular architectures of the LbL and LB films take to different eletrical responses and allow the MP detection in concentrations of nanomolar. The SERS technique was applied to obtain structural information of the system MP/phospholipids at the dilution levels reached via impedance spectroscopy at the dilution levels reached via impedance spectroscopy. Then, LB monolayers were deposited onto 6nm of Ag evaporated films with and Ag evaporated films with and Ag nanoparticles were dispersed within the LbL films. The presence of Ag forming nanoparticles in both cases played a key role in achieving the MB SERRS signal allowing obtaining the detection in high dilution levels, approaching... (Complete abstract click electronic access below)

Au cours de ce travail, nous nous sommes intéressés à l’élaboration de cristaux photoniques colloïdaux d’architecture contrôlée afin d’étudier leur effet sur les spectres de photoluminescence de luminophores. Notre stratégie a été d’incorporer les émetteurs au sein des particules de silice composant les cristaux colloïdaux de façon à les répartir de manière homogène dans l’ensemble des matériaux. Nous présentons la synthèse des précurseurs minéraux et l’élaboration de cristaux colloïdaux d’épaisseur contrôlée à la couche près grâce à la technique de Langmuir-Blodgett. Ces structures sont caractérisées par une bande interdite qui affecte la propagation de la lumière. L’insertion d’une couche de particules de diamètre différent dans un cristal colloïdal induit l’apparition d’une bande passante au sein de la bande interdite. Nous avons ainsi étudié l’influence de la structure de cristaux avec et sans défaut(s) sur les spectres d’émission de différents luminophores. Nous avons observé une inhibition et une exaltation locale de la lumière émise dans les zones spectrales correspondant respectivement aux bandes stoppante et passante. Nous avons également observé des modifications réversibles des spectres de photoluminescence des émetteurs, lorsque ceux-ci sont incorporés au sein de cristaux colloïdaux dont les propriétés optiques peuvent être modulées via l’application d’un stimulus extérieur. / During this work, we were interested in the elaboration of colloidal photonic crystals with a controlled architecture to study their effect on the photoluminescence spectra of emitters. Our strategy was to incorporate the emitters within the silica particles composing the colloidal crystals in order to distribute them homogeneously in the samples. We present the synthesis of the mineral precursors and the elaboration of colloidal crystals whose thickness is controlled at the layer level thanks to the Langmuir-Blodgett technique. These structures are characterized by a band gap which affects the light propagation. Insertion of a monolayer of particles with a different size as a planar defect within a colloidal crystal leads to the formation of a pass band in the band gap. We thus studied the effect of the structure of crystals with or without planar defect(s) on the emission spectra of different emitters. We observed local inhibition and exaltation of the emission in the spectral region corresponding to the stop band and the pass band, respectively. We have also observed reversible modulations of the photoluminescence spectra of the emitters when these ones were incorporated in colloidal crystals whose optical properties can be tuned by an external stimulus.

京都大学 / 0048 / 新制・課程博士 / 博士(農学) / 甲第19193号 / 農博第2132号 / 新制||農||1034(附属図書館) / 学位論文||H27||N4939(農学部図書室) / 32185 / 京都大学大学院農学研究科森林科学専攻 / (主査)教授 髙野 俊幸, 教授 西尾 嘉之, 教授 木村 恒久 / 学位規則第4条第1項該当 / Doctor of Agricultural Science / Kyoto University / DGAM