Tesis sobre el tema "Silsesquioxane"
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König, Heinrich Josef. "Silsesquioxane mit oligomeren Käfigstrukturen". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967650496.
Texto completoXu, Lan. "Synthesis of Perylenediimide-Functionalized Silsesquioxane Nanostructures". TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1371.
Texto completoYang, Yuxing. "Synthesis and rearrangement of silsesquioxane cages". Thesis, Open University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393194.
Texto completoSoares, Isaac Vaz. "Síntese e caracterização de suportes a base de óxidos de silício modificados". Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152609.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este trabalho descreve as sínteses e caracterizações de materiais à base de silício organofuncionalizados com 2-amino-5-(4-piridil)-1,3,4-tiadiazol (T8-Pr-APT e SG-Pr-APT) e 4 -amino-5-(4-piridil)-4H-1,2,4-triazol-3-tiol (T8-Pr-APTT e SG-Pr-APTT). Os materiais foram caracterizados por: espectroscopia na região do infravermelho (FTIR), ressonância magnética nuclear 29Si e 13C no estado sólido (RMN) e Microscopia eletrônica de varredura com Espectroscopia de energia dispersiva de raios-X (MEV-EDS). Nos estudos de batelada para os materiais, foram utilizados os íons metálicos de V(III), Fe(III), Cr(III), Cu(II), Pb(II) e os solventes foram água e etanol. Determinou-se a dose de adsorvente na solução e o tempo de equilíbrio, na qual, para o material T8-Pr-APT em todos os meios para os metais Cu, Pb e Cr, a capacidade máxima de adsorção ocorreu em 60 mg de adsorvente e para os metais restantes de 100 mg de adsorvente, o equilíbrio de adsorção em ambos os meios foi de aproximadamente 20 minutos para os metais Cu, Pb e Cr e 30 minutos para os demais, enquanto que, para o SGPr- APT em todos os meios para os metais Cu e Cr, a capacidade máxima de adsorção ocorreu em 60 mg de adsorvente e para os metais restantes de 100 mg de adsorvente, o equilíbrio de adsorção em ambos os meios foi de aproximadamente 40 minutos para todos os metais estudados. Estudou-se ainda a capacidade máxima de adsorção (Nf) para os solventes, na qual a capacidade máxima se deu em meio etanólico > aquoso. Em seguida, as isotermas de adsorção foram ajustadas pelos modelos Langmuir, Freundlich, Temkin e Dubinin-Radushkevich (D-R). Para cinética de adsorção dos metais, foram usados três modelos cinéticos como pseudoprimeira- ordem, pseudo-segunda-ordem e Elovich. Os modelos de Langmuir e Elovich foram os mais apropriados para descrever os dados de adsorção e cinética, respectivamente, de todos materiais. Os parâmetros termodinâmicos ΔGº, ΔHº e ΔSº foram avaliados para os materiais e observou-se que a adsorção de todos os metais, independentemente do adsorvente utilizado, foi um processo endotérmico e espontâneo, devido aos valores positivos de entalpia e negativo de energia livre de Gibbs, respectivamente. Os valores positivos da entropia indicam que o processo de adsorção é favorável e ocorre um aumento da desordem na interface sólido-solução. Estes resultados mostraram que os materiais possuem o mesmo comportamento termodinâmico. A atividade catalítica dos materiais suportados foram testados e comparados, utilizando complexo de molibdênio e tungstênio para epoxidação do 1-octeno, cicloocteno, cis-3-hexen- 1-ol, trans-3-hexen-1-ol e estireno, utilizando como oxidante o hidroperóxido de terc-butil (TBHP), onde ambos os materiais possuem semelhantes conversões e uma boa seletividade.
This work describes how syntheses and characterizations of silicon-based materials organofunctionalized with 2-amino-5- (4-pyridyl) -1,3,4-thiadiazole (T8-Pr-APT and SG-Pr- APT) and 4- Amino-5- (4-pyridyl) -4H-1,2,4-triazol-3-thiol (T8-Pr-APTT and SG-Pr-APTT). The materials were characterized by: infrared spectroscopy (FTIR), 29Si and 13C solid state nuclear magnetic resonance (NMR) and scanning electron microscopy with X-ray dispersive energy spectroscopy (SEM-EDS) V (III), Fe (III), Cr (III), Cu (II), Pb (II) and the solvents for ethanol and water. Determination of a adsorption dose in the solution and the equilibration time in quality for the T8-Pr-APT material in all media for the Cu, Pb and Cr metals, a maximum adsorption capacity occurred in 60 mg of adsorbent and for the remaining 100 mg adsorbent, the adsorption equilibrium in both media for approximately 20 minutes for the Cu, Pb and Cr metals and 30 minutes for the others, whereas for the SG-Pr-APT at all means for Cu and Cr metals, a maximum adsorption capacity occurred at 60 mg adsorbent and for other 100 mg adsorbent, the adsorption equilibrium in both media was about 40 minutes for all metals studied. A maximum adsorption capacity (Nf) was also studied for the solvents, in which a maximum capacity is given in ethanolic> aqueous medium. Then, as adsorption isotherms were adjusted by the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) models. For kinetics of adsorption of metals, three kinetic models were used as pseudo-first-order, pseudo-second order and Elovich. The Langmuir and Elovich models were more adequate to describe the adsorption and kinetic data, respectively, of all materials. The thermodynamic parameters ΔGº, ΔHº and ΔSº were evaluated for the materials and it was observed that an adsorption of all metals, independently of the adsorbent used, for an endothermic and spontaneous process, for the enthalpy and negative positive values of Gibbs free energy , respectively. The positive entropy values indicate that the adsorption process is favorable and an increase in the disorder occurs at the solid-solution interface. These results show that the materials have the same thermodynamic behavior. The catalytic activity of the supported materials was tested and compared using a molybdenum and tungsten complex for the epoxidation of 1-octene, cyclooctene, cis-3-hexen-1-ol, trans-3-hexen-1-ol and styrene, Oxidant Or tert-butyl hydroperoxide (TBHP), where both materials have conversions and good selectivity
Cai, Jun. "Photoluminescence studies of silsesquioxanes (SiO1.5)nRn and some selected organosilicon compounds". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965479447.
Texto completoLuvison, Caroline. "Preparação e caracterização de novos materiais híbridos a partir de (3-aminopropil) trimetoxisilano". reponame:Repositório Institucional da UCS, 2016. https://repositorio.ucs.br/handle/11338/1349.
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Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul, FAPERGS
In this work, was investigated the obtaining of new materials from the hydrolysis and acid condensation reactions of (3-aminopropyl) trimethoxysilane, which resulted in the formation of hybrid nanostructures with ammoniums groups and counter ions chloride (POSS-NH3Cl). The nanostructures were subjected to ion exchange procedures for 0.5, 2, 12 and 48 h for the removal of chloride ions. The titrimetric and volumetric results showed that the ion exchange occurred partially. The synthesized particles are predominantly POSS-NH2 cage-shaped structures (T8). After the ion exchange, the nanostructures have ability to selfassembly through electrostatic interactions forming the blackberry-like structures with approximately 100 nm. The POSS-NH2 cluster are formed by primary particles with a size of 1.4nm structured in form of a mass fractal with correlation length () dependent on the ion exchange time. Due to the electrostatic characteristic of the particles was possible obtained hybrid films optically transparent with a high degree of hydrophilicity. POSS-NH2 nanoparticles were used as additive of lubricants of renewable sources (fatty acids) by means of microwave-assisted direct reactions of amidation, without the use of catalysts. The formation of amide bonds were confirmed through the FTIR and 1H NMR techniques, where angular deformation bands in NH in 1550 cm-1 and 1120 cm-1 and the appearance of an enlarged singlet in 6.50 ppm (NH) were observed. The biolubricants was found that an alloy fatty acid molecule with a POSS, but has not yet noticed the existence of agglomerates after amidation, as TEM results of biolubricants. The POSS-NH2 are bonded individually to only one fatty acid molecule, however it was noted the existence of cluster after amidation reactions, as observed in TEM results of the biolubricants. The addition of POSS-NH2 nanoparticles reduced the oxidation rate of the biolubricants and has dependence on the ion exchange time. All the biolubricants showed a Newtonian rheological behavior and the viscosity at 25°C dependent on the amount of particles and not the exchange time. The addition of POSS-NH2, improved the performance of the biolubricants applied on metallic surfaces, since the studied sliding pair showed lower and more stable values of coefficient of friction, as compared to the base oil. Moreover, the biolubricants showed a high load support capacity, which represents the critical load for the scuffing occurrence of the system. The wear resistance of the metallic surfaces changed with the addition of POSS particles in the lubricant oil and with the ionic exchange time adopted for the synthesis of the particles.
Liu, Zhihua. "Synthesis and reactions of novel silsesquioxane cages". Thesis, Open University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397913.
Texto completoGentle, Theresa Eileen. "Octopus and dendrimer molecules with silsesquioxane cores". Thesis, Open University, 1995. http://oro.open.ac.uk/57544/.
Texto completoSchumacher, Manuela. "Smart organic-inorganic nanohybrids of functionalized silsesquioxane nanoparticles". kostenfrei, 2008. http://opus.ub.uni-bayreuth.de/volltexte/2009/549/.
Texto completoNeerudu, Sreeramulu Niharika. "Colloidal Self-Assembly of Multi-fluorescent Silsesquioxane Microparticles". TopSCHOLAR®, 2016. http://digitalcommons.wku.edu/theses/1607.
Texto completoCapaldi, Franco Mario 1977. "Atomistic simulations of octacyclopentyl polyhedral oligomeric silsesquioxane polyethylene nanocomposites". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32388.
Texto completo"June 2005."
Includes bibliographical references.
As the scientific community develops the ability to create composites which incorporate nanoscopic filler particles, the detailed atomic arrangement and atomic interactions become significant in determining the composite properties. Nanoscopic fillers such as carbon nanotubes, polyhedral oligomeric silsesquioxane (POSS), and layered silicates have already been successfully used to improve the thermal and mechanical properties of polymers. On this length scale, details describing particle organization, interaction between particles, and interactions between particle and matrix are needed to understand the behavior of the composite. In this thesis, we use atomistic simulations to investigate the detailed behavior of a blended octacyclopentyl polyhedral oligomeric silsesquioxane (CpPOSS) / polyethylene (PE) nanocomposite. The model potential employed to describe the atomic interactions in these systems is capable of reproducing the experimental vibrational and crystal structures for the POSS well. The mechanical properties of an infinite crystal were calculated. The), are anisotropic with a Reuss average isotropic elastic modulus of 11.78 GPa. Simulations of CpPOSS/PE composites revealed that the POSS had a stiffening effect on the polymer. Simulations revealed that both PE and POSS dynamics as measured by translational and rotational diffusivities decreased, the glass transition temperature increased, and both the density and modulus increased with increasing POSS content. Micromechanical models were fit to the composite modulus which allowed effective mechanical particle sizes to be determined.
(cont.) The POSS was found to aggregate into small necklace structures which have internal ordering similar to the crystal phase. The formation of crystallites was found to be energetically favorable in this system. A coarse grained potential which accounts for both the attraction and orientation between particles was developed to aid the further study of aggregation and crystallization in these composites. The interface between the POSS and the polymer is found to consist of polymer chains aligned tangentially to the POSS cage. This layer has increased mobility tangential to the surface of the particle and decreased mobility in the radial direction. Though it is very thin, consisting of only 1 or 2 monolayers of polymer, due to the small size of the POSS particle, the weight fraction of polymer in the interfacial region is as high as 43 % in the 25 weight percent CpPOSS/PE composite. These simulations reveal the formation of structure on both the angstrom length scale in the polymer near the interface and the mesoscopic length scale between the POSS particles.
by Franko M. Capaldi.
Ph.D.
Cho, Hosouk. "Chemical incorporation of polyhedral oligomeric silsesquioxane into thermoset matrices". Diss., Mississippi State : Mississippi State University, 2006. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.
Texto completoRiaz, Ali 1981. "Functionalized polyhedral oligomeric silsesquioxane (POSS) for incorporation of chemically pendant chains = Utilização de silsesquioxanos oligoméricos poliédricos funcionalizados (POSS) no ancoramento de cadeias orgânicas à superfície". [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250644.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Instituto de Química
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Resumo: Este trabalho apresenta a síntese e caracterização de compostos silsesquioxanos gaiola cúbica (POSS) com cadeias orgânicas pendentes. O projeto foi iniciado com a idéia de sintetizar os silsesquioxanos cúbicos com cadeias organofuncionalizadas ancoradas, capazes de capturar os metais pesados, corantes e CO2. Mas foram enfrentadas algumas dificuldades como baixo rendimento (30-37%) e longo tempo de reação (5-35 dias). As reações foram investigadas para melhorar o rendimento, bem como para reduzir o tempo de reação. Algumas modificações em rotas de reação foram introduzidas, o que trouxe melhorias notáveis nos resultados, onde o rendimento aumentou cerca de 64 % e o tempo de reação foi reduzido para 24 horas em média. Na sequência, os produtos sintetizados foram caracterizados para elucidar suas estruturas, utilizando diferentes técnicas físicas tais como FTIR, CHN, XRD, MEV, TGA, 13CNMR e 29SiNMR no estado sólido, onde as gaiolas Si-O de todos os compostos foram evidenciadas por meio de 29SiRMN e dos seus espectros de FTIR, enquanto as cadeias ancorados às gaiolas de POSS foram confirmadas utilizando os resultados de 13CRMN, juntamente com seus respectivos espectros de FTIR. Os compostos sintetizados também foram testados quanto à sua estabilidade térmica utilizando a técnica de TGA. Após a otimização da síntese de silsesquioxanos cúbicos, os híbridos PAA-13-3, PAA-MTC e PAA-Ph foram avaliados por suas habilidades de captação de cátions bivalentes, tais como Cu2+, Cd2+ e Pb2+ de suas soluções aquosas, sendo que o Cu2+ apresentou maior afinidade de sorção em relação aos dois metais. Estes sistemas de sorção foram analisados através ICP-OES. Para explicar o comportamento de sorção destas amostras alguns modelos estatísticos como Langmuir, Freundlich, Temkin e Redlich-Peterson foram aplicadas, onde os dados de sorção de Cu2+ em PAA-13-3 foram melhor ajustados pelo modelo Langmuir, mostrando ser uma sorção monocamada, enquanto que no caso do PAA-MTC e PAA-Ph modelo de melhor ajuste foi o Freundlich, confirmando a sorção de múlti camadas. Um dos materiais sintetizados (PAA-13-3) foi avaliado quanto à sua capacidade de adsorver CO2 gasoso, mostrando-se promissor na remoção de CO2, mesmo a baixas pressões (máx. 100 mm Hg). A adsorção de CO2 no material também foi estudada por calorimetria de adsorção gás-sólido, em um calorímetro especialmente desenvolvido para tal, observando-se valores de entalpia de adsorção entre -36 e -7 kJ mol-1
Abstract: This report presents the synthesis and characterization of POSS compounds having cubic silsesquioxane cage to which the organic pendant chains are anchored. The project was started with the idea to synthesize the cubic silsesquioxanes with organofunctionalized pendant chains, which are able to capture heavy metals, dyes and some acids like CO2. But in the beginning the hurdles like low % yields (30-37 %) and long reaction times (5-35 days) were to be faced. The reactions were worked out to enhance the % yields as well as to reduce the reaction time. Some modifications in reaction routes have been introduced, which brought up remarkable improvements in the results, where yield was increased upto 64 % and reaction time was reduced to 1 day. All the synthesized products were then characterized for their structure elucidations using different physical techniques like FTIR, CHN, TGA, 13CNMR & 29SiNMR in solid state, where Si¿O cages of all compounds were elaborated through 29Si-NMR in solid state as well as through their respective FTIR patterns, while the pendant chains anchored to the POSS cages were confirmed using 13C-NMR results along with their respective FTIR spectra. The synthesized compounds were then tested for their thermal stability using the TGA technique. After optimizing the synthesis of cubic silsesquioxanes, hybrids PAA-13-3, PAA-MTC and PAA-Ph were worked out for their abilities of capturing divalent cations like Cu2+, Cd2+ and Pb2+ from their aqueous solutions, where Cu2+ showed higher affinity of sorption than other two bivalent metals. These sorption systems were analyzed using the ICP-OES. To explain the sorption behaviour of these samples some statistical models like Langmuir, Freundlich, Sips, Temkin and Redlich-Peterson were applied to the sorption data, where the data for Cu2+ on to PAA-13-3 was best fitted by Langmuir adsorption isotherm model showing the sorption to be monolayer, while in case of PAA-MTC and PAA-Ph Freundlich model was found to be a best fit, confirming multilayer sorption. One of the synthesized materials (PAA-13-3) was also evaluated for its ability to adsorb gaseous CO2 and was proved to be promising in removing CO2, even at low pressures (max. 100 mmHg). The adsorption of CO2 in the material is also studied by solid-gas adsorption calorimetry through a calorimeter especially developed for this system, where enthalpy of adsorption values were found to be between -7 and -36 kJ mol-1
Doutorado
Quimica Inorganica
Doutor em Ciências
Reißig, Thomas. "Elektrochemie von redoxaktiv modifizierten Silsesquioxanen". [S.l. : s.n.], 2008.
Buscar texto completoFreitas, Bianca Trama. "Leveduras quimicamente modificadas com silsesquioxanos cúbicos : avaliação como biossorvente e sensor eletroquímico /". Ilha Solteira, 2019. http://hdl.handle.net/11449/181340.
Texto completoResumo: A detecção, especiação e remoção de contaminantes orgânicos e inorgânicos é uma das maiores preocupações ambientais atualmente. Assim, a busca por tecnologias eficientes envolvendo materiais de baixo custo para a resolução de tal problema tem aumentado, e se tornou de extrema importância. Dentro deste contexto, o presente trabalho atuou na produção de um novo material nanoestruturado bioinorgânico híbrido com grandes potencialidades na área de nanotecnologia. O objetivo principal consistiu em modificar quimicamente a levedura Saccharomyces cerevisiae com silsesquioxanos cúbicos. Após devidas modificações, o material preparado (LevS) bem como seus precursores, foram caracterizados por técnicas espectroscópicas tais como infravermelho (FTIR) e microscopia eletrônica de varredura (MEV). O material hibrido formado (LevS) foi aplicado como biossorvente de chumbo (Pb) e níquel (Ni), obtendo-se uma capacidade máxima de sorção de 248 mg g-1 e 64,6 mg g-1, respectivamente, e porcentagem de sorção chegando a 100% para 500 ppm de Pb2+ em 250mLg-1 de razão líquido/sólido em pH 4, e 77,7% para 100 ppm de Ni2+ em 100 mLg-1 de razão líquido/sólido em pH 6. Adicionalmente com intuito de avaliar a toxidade neuronal dos metais em questão, foram efetuados testes de toxicidade em fatias de hipocampo de ratos que comprovaram que, uma vez submetidos à concentrações de 1 e 3 μM (0,2 e 0,6 ppm) Pb2+ e 10 e 30 μM (0,5 e 1,5 ppm) de Ni2+, as alterações neuronais causadas são irreversíveis. O material ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The detection, speciation and organic and inorganic contaminants removal is one of the biggest environmental concerns today. Thus, the search for efficient technologies involving low-cost materials for solving such a problem has increased, and became extremely important. Within this context, the present work was focused in the production of a new nanostructured hybrid material bioinorganic with great potential in the area of nanotechnology. The main objective was chemically modify the yeast Saccharomyces cerevisiae with cubic silsesquioxane. After appropriate modifications, the prepared material (LevS) as well as its precursors was characterized by spectroscopic techniques such as infrared (FTIR), scanning electron microscopy (SEM), energy dispersive x-ray (EDS) and Diffuse Reflectance UV/Vis. The hybrid material formed (LevS) was applied as biosorbent of lead (Pb) and nickel (Ni), with a maximum capacity of sorption of 248 mg g-1 and 64.6 mg g-1, respectively, and percentage of reaching 100% sorption to 500 ppm of Pb2+ on 250 cm3 g-1 liquid/solid ratio and 4 pH, and 77.7% to 100 ppm of Ni2+ on 100 cm3 g-1 liquid/solid ratio at pH 6. In addition, in order to evaluate the neuronal toxicity of the metals in question, toxicity tests were performed on hippocampal slices of mice that proved that, once submitted to concentrations of 1 and 3 μM (0.2 and 0.6 ppm) Pb2+ and 10 and 30 μM (0.5 and 1.5 ppm) of Ni2+, neuronal changes caused are irreversible. The hybrid material was also te... (Complete abstract click electronic access below)
Doutor
Kannan, R. Y. "Development of silsesquioxane-polyurethane nanocomposites for use in microvascular networks". Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1445620/.
Texto completoClarke, David John y d. clarke@irl cri nz. "The Synthesis and Characterisation of Polyhedral Oligomeric Silsesquioxane Bound Chromophores". Flinders University. School of Chemistry, Physics and Earth Sciences, 2008. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20080908.074728.
Texto completoPourny, Manuel. "The preparation of encapsulated flouride anion in T8 silsesquioxane cages". Thesis, Open University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418463.
Texto completoLiu, Yang. "Synthesis and Characterization of Polyhedral Oligomeric Silsesquioxane (POSS) Based Amphiphiles". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77182.
Texto completoPh. D.
Liu, Yang. "Synthesis and Characterization of Polyhedral Oligomeric Silsesquioxane (POSS) Based Amphiphiles". Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/76922.
Texto completoMaster of Science
Hörner, Sebastian [Verfasser], Harald [Akademischer Betreuer] Kolmar y Siegfried [Akademischer Betreuer] Neumann. "Biofunctionalization of Silsesquioxane Nanoparticles / Sebastian Hörner ; Harald Kolmar, Siegfried Neumann". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1136422846/34.
Texto completoKulkarni, Pallavi P. "Effect of polyhedral oligomeric silsesquioxane on gas transport properties of polyimide /". Connect to full text in OhioLINK ETD Center, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1196883179.
Texto completoTypescript. "Submitted as partial fulfillment of the requirements for the Doctor of Philosophy degree in the Engineering Science Concentration in Chemical and Environmental Engineering." Bibliography: leaves 213-221.
Peak, Sarah M. "SELECTIVE TRIPODAL TITANIUM SILSESQUIOXANE CATALYSTS FOR THE EPOXIDATION OF UNACTIVATED OLEFINS". UKnowledge, 2015. http://uknowledge.uky.edu/chemistry_etds/52.
Texto completoBakhshi, R. "Coating stent materials with polyhedral oligomeric silsesquioxane-poly(carbonateurea)urethane nanocomposites". Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/18987/.
Texto completoKulkarni, Pallavi. "Effect of Polyhedral Oligomeric Silsesquioxane on Gas Transport Properties of Polyimide". University of Toledo / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1196883179.
Texto completoMagossi, Mariana de Souza. "Nanocompósitos híbridos a base de silsesquioxano e nitroprussiato de cobalto e zinco : preparação, caracterização e aplicações eletroanalíticas /". Ilha Solteira, 2019. http://hdl.handle.net/11449/181980.
Texto completoResumo: Neste trabalho, novos nanocompósitos híbridos a base de silsesquioxano e nitroprussiato de cobalto e zinco foram preparados, seguindo dois métodos de síntese. Os materiais preparados foram caracterizados empregando diferentes técnicas: Espectroscopia na Região do Infravermelho por transformada de Fourier (FTIR), Espectroscopia Raman, Espectroscopia de Reflectância Difusa UV/Vis, Ressonância Magnética Nuclear (RMN), Difração de Raios-X (DRX), Microscopia Eletrônica de Varredura (MEV), Espectroscopia de Energia Dispersiva de Raios-X (EDX), Microscopia Eletrônica de Transmissão (MET) e Análise Termogravimétrica (TGA). Após a obtenção dos nanocompósitos com complexos metálicos de nitroprussiato (ACCoN e ACZnN), realizou-se um estudo sistemático sobre o comportamento voltamétrico desses materiais, empregando técnicas eletroquímicas, tais como: Voltametria Cíclica (VC) e Voltametria de Pulso Diferencial (VPD), utilizando eletrodos de pasta de grafite. O eletrodo de pasta de grafite contendo ACCoN mostrou-se sensível a concentrações de hidrazina e isoniazida. Já o eletrodo de pasta de grafite contendo ACZnN foi aplicado na detecção de N-acetilcisteína e isoniazida com sucesso. Após os testes de eletro-oxidação catalítica dessas substâncias, realizou-se uma investigação da influência dos principais interferentes, de forma que a interferência observada não se mostrou significativa. Avaliou-se também a recuperação destas substâncias a partir de amostras de água da torneira e urina sint... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: In this work, new nanocomposites based on silsesquioxane and cobalt and zinc nitroprusside were prepared, following two synthetic methods. The prepared materials were characterized by different techniques: Fourier Transform Infrared Spectroscopy (FTIR), Raman Spectroscopy, UV-Vis Diffuse Reflectance Spectroscopy, Nuclear Magnetic Resonance (NMR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray spectroscopy (EDX), Transmission Electron Microscopy (TEM), Thermogravimetric Analysis (TGA). After obtaining the nanocomposites with metallic nitroprusside complexes, it was carried out a systematic study on the voltammetric behavior of these materials, using electrochemical techniques, such as: Cyclic Voltametry (CV) and Differential Pulse Voltammetry (DPV), using graphite paste electrodes. The graphite paste electrode containing ACCoN was sensitive to concentrations of hydrazine and isoniazid. The graphite paste electrode containing ACZnN was applied to the detection of N-acetylcysteine and isoniazid, with success. After catalytic electrooxidation tests of these substances, it was investigated the influence of the main interferents, so that the noticed interferences were not significant. Also, it was evaluated the recovery of these substances from samples of tap water and synthetic urine. By this way, the binuclear hybrid nanocomposites formed (ACCoN and ACZnN) are potential candidates for the construction of electrochemical sensors in the hydrazi... (Complete abstract click electronic access below)
Doutor
Liang, Kaiwen. "Cyanate ester, epoxy and epoxy/cyanate ester matrix polyhedral oligomeric silsesquioxane nanocomposites". Diss., Mississippi State : Mississippi State University, 2005. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.
Texto completoTaleb, Wassim. "Nanotechnology for corrosion control : silsesquioxane based nanofillers for iron carbonate film enhancement". Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/17863/.
Texto completoWu, Kan. "Syntheses and Characterization of Polyhedral Oligomeric Silsesquioxane Based Giant Molecular Shape Amphiphiles". University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1399564457.
Texto completoOmambala, Joshua R. "The Electrorheological Effect of Polyhedral Silsesquioxane Cage Structures with Cyanopropyl Functional Groups". Thesis, University of Louisiana at Lafayette, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10248880.
Texto completoPrevious research has shown that POSS particles in silicone oil show significant ER activity. It is shown for the first time the effect of the number of the same functional groups attached to POSS cage structures on the electrorheological activity of these structures. Two compounds of the Octahedral geometry (T8) of cyanopropyl POSS was used for this investigation. One of the compounds was purchased (monofunctionalized cyanopropyl POSS) and the other was synthesized (octafunctionalized cyanopropyl POSS). The hydrolysation method has been used in the synthesis, the yield of the synthesized octafunctionalized POSS compound calculated and the both micrometer sized compounds characterized. The effects of the functional group attached to the inorganic silicon-oxygen core structure of the POSS compounds on the rheological properties is demonstrated through steady flow and oscillatory tests. Particular attention is paid to how the number of the cyano functional groups affects the behavior of these suspensions of cyanopropyl POSS compounds in silicone oil under increasing electric field strength. The research also contributed answers to the effects of changing the concentration of the cyanopropyl POSS particles in the suspension. The flow curve was described by the Herschel-Bulkley model and the Yield stress values ascertained from the model. The dielectric characterization was also done to support the ER response results which showed that the octafunctionalized compound gave a better response. The differences of the electrorheological properties of these compounds has also been discussed with the tests.
Voisin, Doria. "Structuration d’organosilices : assemblage covalent et auto-organisation de T8- silsesquioxanes octa-fonctionnalisés". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2016. http://www.theses.fr/2016ENCM0017/document.
Texto completoThe present work aimed at synthesising nano-structured organosilicas using polyhedral silsesquioxane building blocks (T8-POSS) having a cube structure. The assembly of T8-POSS building blocks to form a 3D network was studied in two ways: first by formation of strong covalent bonds and secondly by formation of weak hydrogen bonds.The first part described the formation of covalent hybrid networks from T8-POSS structures with eight aldehyde functional groups. The synthesis and crystal structure of these functionalised silsesquioxane cubes is described and the reactivity of the aldehyde groups is studied. The formation of C=N bonds upon reaction with amines lead to tree-dimensional networks upon formation of bis-imine bridges linking the silsesquioxane units. Despite the imine formation was reversible, the resulting solids were amorphous materials and exhibited no long distance order. The formation of C=C bonds, under non-reversible reaction conditions, was achieved by reaction of phosphonium bis-ylides. The Wittig type reactions generated amorphous hybrid networks containing bridging phenylene-vinylene substructures with fluorescence properties.The second part described the synthesis of new functionalised T8-POSS cubes with eight amine or carboxylic acid functions capable of intermolecular interactions by hydrogen bonding. It allowed the assembly of the octa-carboxylique acid cubes to form an ordered 3D hybrid network. The T8-POSS building blocks self-assembled upon dimerization of the acid groups and generated crystalline hybrid silicas. The crystal structures were determined by X-ray diffraction. The use carboxylic acid groups is interesting because of its ability to form hydrogen bonds and also because of its ability to form metal carboxylate derivatives. It could lead to hybrid metal organic silica frameworks
Soares, Layciane Aparecida [UNESP]. "Propriedades analíticas e eletroanalíticas de um silsesquioxano nanoestruturado organofuncionalizado". Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/91961.
Texto completoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O presente trabalho apresenta a preparação de um silsesquioxano nanoestruturado, o cloropropilsilsesquioxano (S) que foi organofuncionalizado com os seguintes agentes modificadores: 4-amino-3-hidrazinico-5-mercapto-1,2,4-triazol (Purpald®) e o 4-amino-5-4(piridil)-4H-1,2,4-triazol-3-tiol (APTT), os materiais obtidos dessa funcionalização foram descritos como SP e SA, respectivamente. Os materiais SP e SA foram caracterizados por diversas técnicas espectroscópicas: Espectroscopia na região do infravermelho (FT-IR), Ressonância magnética nuclear 29Si e 13C no estado sólido (RMN), Difração de Raios- X (DRX), Espectroscopia de Energia Dispersiva de Raios X (EDX), Termogravimetria e Análise Térmica Diferencial (TG – DTA). Após a devida caracterização, realizaram-se estudos de adsorção de íons metálicos (Cu2+, Cd2+ e Ni2+) nos sítios ativos do SA, porém, curiosamente não se observou a mesma capacidade de sorção pelo SP. Diferentes meios foram estudados no processo de adsorção dos íons metálicos supracitados: aquoso, etanólico 99% e etanólico 42%, determinando-se o tempo de equilíbrio de adsorção, que para ambos os meios e metais esse tempo máximo foi em média 35 min. Determinado o tempo de equilíbrio de adsorção dos íons metálicos em cada sistema, determinou-se a capacidade específica de sorção (Nfmax) através de isotermas de adsorção. Para o Cu2+, os valores de Nf foram: meio aquoso (3,09 × 10-4 mol g-1), etanólico 42% (1,03 × 10-4 mol g-1) e etanólico 99% (1,86 × 10-4 mol g-1), com concentrações de íons Cu2+ variando de 1,74 a 29,64 mol L-1. Os valores encontrados para o Ni2+ foram: em meio aquoso (2,11 × 10-4 mol g-1), etanólico 42% (0,97 × 10-4 mol g-1) e etanólico 99% (1,05 × 10-4 mol g-1), com concentrações de íons Ni2+ variando de 2,25 a 33,18 mol L-1. Para os íons cádmio não foram...
This work presents the preparation of a nanostructured silsesquioxane, the cloropropilsilsesquioxano (S) that was organofunctionalised with the following modifying agents: 4-amino-3-hydrazino 5 - mercapto 1,2,4 triazole (Purpald ®) and 4- amino-5-4 (pyridyl)-4H-1,2,4-triazole-3-thiol (APTT), the materials obtained of the functionalization were described as SP and SA, respectively. The materials SA and SP were characterized by various spectroscopic techniques such as spectroscopy in the region of infrared (FTIR), nuclear magnetic resonance 29Si and 13C solid-state (NMR), X-ray diffraction (XRD), Energy Dispersive Spectroscopy Rays (EDS), Thermogravimetry and Differential Thermal Analysis (TG - DTA). After proper characterization, were carried studies on adsorption of metallic ions such as Cu2+, Ni2+ and Cd2+ in the active sites of SA, but curiously did not observe the same sorption capacity of the SP. Different methods were studied in the adsorption of metal ions above: aqueous, 99% ethanolic and 42% ethanolic, determining the adsorption equilibrium time, which for both means and metals the maximum time averaged 35 min. After determining the adsorption equilibrium time of metal ions in each system, we determined the specific sorption capacity (Nfmax) through adsorption isotherms. For Cu2+, the values of Nf were: aqueous solution (3.09 × 10-4 mol g-1), 42% ethanolic (1.03 × 10-4 mol g-1) and 99% ethanolic (1.86 × 10-4 mol g-1), with Cu2 + ion concentrations ranging from 1.74 to 29.64 mol L-1. The values obtained for the Ni2+ were: aqueous solution (2.11 × 10-4 mol g-1), 42% ethanolic (0.97 × 10-4 mol g-1) and 99% ethanolic (1.05 × 10-4 mol g-1), with Ni2 + ion concentrations ranging from 2.25 to 33.18 mol L-1. For the cadmium ions were not observed saturation of adsorption sites in the concentration range studied, not getting the maximum... (Summary complete electronic access click below)
Liu, Chang. "GIANT LIPIDS BASED ON POLYHEDRALOLIGOMERIC SILSESQUIOXANE AND POLYSTYRENE:THE SELF-ASSEMBLY IN THE MELT". University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1502879178237178.
Texto completoBo, Ni. "Design, Synthesis and Self-assembly of Polyhedral Oligomeric Silsesquioxane (POSS) Based Hybrid Materials". University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron152130982499385.
Texto completoNarikiyo, Hayato. "Development of Functional Materials Based on Polyhedral Oligomeric Silsesquioxane with Flexible Side-Chains". Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263688.
Texto completo京都大学
新制・課程博士
博士(工学)
甲第23227号
工博第4871号
京都大学大学院工学研究科高分子化学専攻
(主査)教授 田中 一生, 教授 秋吉 一成, 教授 古賀 毅
学位規則第4条第1項該当
Doctor of Philosophy (Engineering)
Kyoto University
DGAM
Kathan, Kyle R. "An investigation of the nodular microstructure of selected silsesquioxane and epoxy thermosetting resins". [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0012142.
Texto completoEcheverrigaray, Sérgio Graniero. "Processamento reativo de nanocompósitos iPP-POSS". reponame:Repositório Institucional da UCS, 2009. https://repositorio.ucs.br/handle/11338/1028.
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The interaction modes of polyhedral oligomeric silsesquioxane (POSS) of closed cages with distinct functional groups were evaluated on isotactic polypropylene (iPP) nanostructuration via reactive processing. POSS were analyzed with isobutyl, allyl and vinyl substituent groups in concentrations of 0.5, 1, 2 and 5m% mixed with melting iPP using dicumil peroxide (DCP) as initializer. Several techniques were used to characterize the nanocomposites. The morphology was evaluated through size exclusion chromatography, Fourier transformed infrared spectroscopy, transmission electron microscopy and X-ray diffraction. The samples viscoelastic behavior in melting state was measured by oscillatory rheometry and in solid state by dynamic mechanical analysis. The thermal transitions were obtained through dynamic mechanical analysis and differential scanning calorimetry. Important morphology and viscoelastic modifications were observed in nanocomposites by dependency on the type and content of POSS used. The addition of OctaIsobutyl-POSS (OI) suggests lubricant and radicalar stabilizing action for this POSS. The AllylIsobutyl-POSS (AL) incorporation effects indicate that this one acted as plasticizing agent in function of concentration. With OctaVinyl-POSS (OV), the nanocomposites seem to acquire ramified or interlinked structure in dependency on concentration. The radicalar activation promoted by DCP was decisive in the grafting efficiency for some POSS. Therefore, the mode and the interaction intensity between nanoparticles and polymeric matrix were defined by functional groups and POSS concentration. Changes observed in morphology, thermal and viscoelastic properties as in solid state as in melting state are results of these modes and interaction degrees. It was possible to propose interaction mechanisms and morphology arrangements among iPP, DCP and POSS by evaluation of the obtained results as a whole.
Reverdy, Charlène. "Industrial applications of functional nanocelluloses". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI080.
Texto completoThe aim of this work is to implement new properties to a paper based material via the use of functional nanocelluloses. Nanocelluloses are nanoparticles extracted from wood and distinguished in two categories: Cellulose Nanofibrils (CNFs) and Cellulose Nanocrystals (CNCs). This work has only been carried out with CNFs. The chemical reactivity of CNFs was used to functionalize them with organotrialkoxysilanes. The entangled network and highly viscous suspension of CNFs was also used to synthesize silsesquioxane particles with limited size to impart (super)hydrophobic and antimicrobial properties. Knowledge obtained through the study of model CNFs films was then applied to paper based material coating. The functional CNFs were evaluated for its use in an antimicrobial, anti-adherent, greaseproof or superhydrophobic paper surface
Farmer, Catherine Elizabeth. "Surface Characterization of Siloxane, Silsesquioxane, and Maleic Anhydride Containing Polymers at Air/Liquid Interfaces". Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32408.
Texto completoMaster of Science
Liu, Chang. "Giant Molecular Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioxane: Molecular Design and “Click” Synthesis". University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1367933162.
Texto completoCINA', Valerio. "SYNTHESIS AND APPLICATIONS OF NOVEL FULLERENES AND SILSESQUIOXANES BASED STRUCTURES". Doctoral thesis, Università degli Studi di Palermo, 2020. http://hdl.handle.net/10447/395393.
Texto completoGupta, A. "Development and characterisation of silsesquioxane-polycaprolactone nanocomposite scaffolds for use in small intestinal tissue engineering". Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1306713/.
Texto completoQu, Haoran. "SOLUTION SELF-ASSEMBLY OF HEXAETHYLENE GLYCOL-FUNCTIONALIZED POLYHEDRAL OLIGOMERIC SILSESQUIOXANE (GPOSS) TETHERED WITH POLYSTYRENE CHAIN". University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1486638275556455.
Texto completoMcPherson, Melinda Kay. "The Reactivity of Chemical Warfare Agent Simulants on Carbamate Functionalized Monolayers and Ordered Silsesquioxane Films". Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/26793.
Texto completoPh. D.
Deng, Jianjun. "Interfacial Characterization of Polyhedral Oligomeric Silsesquioxane (POSS) Amphiphiles and Polymer Blends: Thermodynamics, Morphology, and Rheology". Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/27126.
Texto completoPh. D.
Karabiyik, Ufuk. "Optical and thermal characteristics of thin polymer and polhedral oligomeric silsesquioxane (POSS) filled polymer films". Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/27713.
Texto completoPh. D.
Jiang, Jing. "Giant Shape Amphiphiles Based on Polyoxometalates (POMs)-Polyhedra Oligomeric Silsesquioxane (POSS) Hybrids: Synthesis and Characterization". University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1366811690.
Texto completoLee, Byoung-Jo. "Nucleating Agent-Assisted Preparation of Polypropylene (PP)/Polyhedral Oligomeric Silsesquioxane (POSS) Nanocomposites and Their Characterization". University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1247779040.
Texto completoYue, Kan. "Design, Synthesis and Self-Assembly of Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioxane-Polymer Conjugates". University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1384817970.
Texto completoPu, Fan. "The Ionic Effect on the Self-Assembly of Polyhedral Oligomeric Silsesquioxane Macroions in Dilute Solutions". University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1426507842.
Texto completo