Ce travail a pour objet de synthétiser de nouveaux matériaux hybrides organiques-inorganiques, de types silsesquioxanes pontants. La structure locale et les propriétés de luminescence sont caractérisées en vue d’applications potentielles dans le domaine de la photonique durable comme les concentrateurs solaires.Dans ce contexte, trois familles distinctes de matériaux sont synthétisées, basées sur six précurseurs pouvant s’auto-assembler à travers des liaisons hydrogènes et dont les parties sililées peuvent être poly-condensées lors de la réaction sol-gel. Ces précurseurs diffèrent par leur sous structure organique i.e. 1) structure linéaire où la partie organique est basée sur le groupement malonamide (P2-m et P4-m); 2) structure linéaire dans laquelle un aromatique sépare deux groupements amide et/ou thioamide (P(UU), P(UT) and P(TT)) et 3) une structure à trois embranchements dont la partie organique est basée sur des groupements amides (t-UPTES (5000)).Les deux hybrides organiques inorganiques (M2-m et M4-m) résultant de l’hydrolyse condensation des précurseurs P2-m et P4-m sont synthétisés en présence de lanthanides. On étudie l’impact de la présence d’un ou deux groupes malonamides sur la structure locale et les propriétés de photoluminescence.Les hybrides organiques-inorganiques (H(UU), H(UT) and H(TT)) sont obtenus par hydrolyse condensation des précurseurs des précurseurs (P(UU), P(UT) and P(TT)). Des composés organiques modèles des trois sous structurels organiques sont également synthétisés. L’impact de la substitution du groupement urée par le groupement thio-urée sur la structure locale des modèles et des hybrides est étudié par spectroscopie vibrationnelle. Les mécanismes de compressions et les propriétés optiques des matériaux sont ensuite analysés à la lumière des différents types de liaisons hydrogènes (urée-urée, urée-thio-urée et thio-urée--thio-urée) mises en évidence dans ces composés.es hybrides basés sur les précurseurs t-UPTES(5000) sont synthétisés selon différentes stratégies. En changeant la concentration de HCl et d’eau ou en effectuant la synthèse dans un environnement contrôlé, on montre une amélioration des propriétés optiques de ce système, en particulier, le rendement quantique absolu et le coefficient d’absorption. De plus, les mécanismes de recombinaison responsables de l’émission sont étudiés à travers la comparaison entre les propriétés de luminescence des modèles organiques et inorganiques.Finalement, de par leur affinité pour les ions lanthanides les précurseurs P2-m and P4-m ont été dopés par des ions Eu3+. La structure locale des hybrides correspondants montre une coordination entre l’hybride et l’hôte. Grâce à un rendement quantique de luminescence très élevé pour ces matériaux, des concentrateurs solaires luminescents peuvent être développés présentant un maximum de rendement quantique absolu de 0.60+/-0.06 et un rendement de conversion optique de 12.3% dans la région spectrale (300-380 nm). / The present work aims to synthesize new organic-inorganic hybrid materials, bridge silsesquioxanes type, and characterize the local structure and photoluminescence properties overlooking potential applications in the area of sustainable photonics, namely, in solid-state lighting as luminescent solar concentrators.In this context, three distinct families of materials based on six precursors which differ in their structural organization are synthesized, i.e. precursors with structure: 1) linear where the organic component is based on malonamide group (P2-m and P4-m); 2) linear which is added an aromatic ring whose organic part is based on amide and/or thioamide (P(UU), P(UT) and P(TT)) and 3) tri-branched which the organic component is based on amide group (t-UPTES (5000)).Two organic-inorganic hybrids (M2-m and M4-m) which results from hydrolysis and condensation of the precursors P2-m and P4-m are synthetized. The role of the presence of one or two malonamide groups is studied in terms of local structure and photoluminescence properties.Three organic-inorganic hybrids (H(UU), H(UT) and H(TT)) based on (P(UU), P(UT) and P(TT)) aresynthesized and structurally characterized aiming to study the role of the hydrogen bond in the self-assembling of these materials. The presence of different types of hydrogen bonds (bifurcated, linear and cyclic) induces different conformations which affect the physical properties (mechanical and optical) of the materials.Hybrids based on t-UPTES(5000) precursor are synthesized based on different synthesis strategies. Changing the concentration of HCl and water content as well as the synthesis in a controlled environment allow the improvement of the optical properties of this system, in particular, the absolute quantum yield and the absorption coefficient. In addition, it is studied the recombination mechanisms responsible for the emission through the comparison between the corresponding photoluminescence properties of the organic and inorganic models.Finally, due to the structural simplicity of the precursors and affinity with lanthanide ions, P2-m and P4-m precursors are doped with Eu3+. The local structure of the corresponding hybrids shows local coordination between the ion and host. Efficient materials concerning the quantum yield values lead to the development of luminescent solar concentrators with a maximum absolute quantum yield of 0.600.06 and optical conversion efficiency in the absorption spectral region (300-380 nm) of 12.3%.

Orientador: Celso Valentim Santilli / Banca: Leila Aparecida Chiavacci Favorin / Banca: Eduardo Ferreira Molina / Resumo: Neste trabalho a metodologia sol-gel foi utilizada para a preparação de materiais híbridos orgânico-inorgânicos (HOI) à base de óxido de poli-etileno (PEO), ligado de forma covalente com o agente acoplador 3(isocianatopropil) - trietoxisilano (IsoTREOS) conjugados com um material zeolítico do tipo MFI, visando aplicações como catalisador para a reação de acetilação do glicerol e assim agregar valor a esse coproduto gerado na produção do biodiesel. O objetivo desta dissertação é demonstrar que o sinergismo entre híbridos do tipo siloxano-poliéter e as zeólitas pode ser explorado na produção de hidrogéis com atividade catalítica. As análises por Microscopia Eletrônica de Varredura (MEV) evidenciaram a homogeneidade na dispersão do material zeolítico na matriz híbrida Os difratogramas de raios-X apresentaram os picos característicos da estrutura cristalina da zeolita ZSM-5 após a conjugação com a matriz U-PEO. Os resultados de Calorimetria Diferencial de Varredura (DSC) revelaram que não ocorre uma mudança significativa na temperatura de transição vítrea (Tg), após a conjugação da matriz híbrida com a zeólita e revelaram uma diminuição do pico endotérmico associado à fusão dos domínios cristalinos do PEO1900, indicando uma possível interação matriz-zeólita. As análises por Espectroscopia no Infravermelho com Transformada de Fourier (FTIR) confirmaram a interação entre a matriz híbrida e a zeólita pelo deslocamento das bandas associadas ao oxigênio tipo éter não coordenado. Medid... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: In this work the sol-gel methodology was used for the preparation of organic-inorganic hybrid (HOI) materials based on polyethylene oxide (PEO) - covalently bonded with the coupling agent 3 (isocyanatopropyl) triethoxysilane (IsoTREOS) conjugate with a zeolitic material of the MFI type, aiming at applications as catalyst for glycerol acetylation reaction and thus add value to this byproduct generated in biodiesel production. The objective of this dissertation is to demonstrate that the synergism between siloxane-polyether hybrids and zeolites can be explored in the production of catalytic activity hydrogels. Scanning Electron Microscopy (SEM) analyzes showed homogeneity in the dispersion of zeolite material in the hybrid matrix. XDR patterns showed the characteristic peaks of the ZSM-5 zeolite crystal structure after conjugation with the U-PEO matrix. Differential Scanning Calorimetry (DSC) results revealed that no significant change in glass transition temperature (Tg) occurs after conjugation of hybrid matrix with zeolite and revealed a decrease in endothermic peak associated with fusion of crystalline domains of PEO1900., indicating a possible matrix-zeolite interaction. Fourier Transform Infrared Spectroscopy (FTIR) analyzes confirmed the interaction between the hybrid matrix and zeolite by shifting the bands associated with uncoordinated ether oxygen. Small-angle X-ray Scattering (SAXS) measurements showed that the starting reagents in the solketal production reaction w... (Complete abstract click electronic access below) / Mestre

Ce travail de thèse présente une méthode de synthèse par le procédé sol-gel pour la préparation de matériaux hybrides organiques-inorganiques (OIH) basés sur le mélange de deux polyéthers différents, le poly (oxyde d´éthylène) (PEO) et le poly (oxyde de propylène) (PPO) liées de façon covalente avec l´agent de réticulation ureasil (U). Dû aux différents sites actifs présents dans la structure du matériau OIH, plusieurs cations métalliques peuvent être introduits dans la matrice hybride par complexation soit avec l´oxygène de type éther, soit avec l´oxygène du type carbonyle. Suite à ce constat, différentes matrices hybrides ont été synthétisées en introduisant des ions Eu3+ ou Li+ afin de conférer aux matériaux des propriétés optiques ou électriques. La compréhension des propriétés structurales et thermiques des différents polymères, l´ajout de différents cations Eu3+/Li+, et l'effet du plastifiant (PPO2000) dans la mélange hybride U-xPEO1900:/U-1-xPPO2000 (ratio de PPO2000 dans la mélange, x = 0.2, 0.5 et 0.8), ont été étudiés par DSC et SAXS. Les résultats de DSC ont révélé une unique température de transition vitreuse (Tg) pour tous les matériaux étudiés. L´ajout des ions Eu3+ dans le matrice n´a pas causé de variations dans les valeurs de Tg tandis que l´insertion de cations Li+ a provoqué une augmentation dans les valeurs de Tg, indiquant l´existence d’interactions entre les cations Li+ et la phase polymérique du matériau OIH. Les courbes de calorimètrie de l´U-PEO1900 ont aussi révélé la présence d´une pic endothermique à 25 °C, associé à la fusion des domaines cristallins du PEO1900. La présence d´un deuxième maximum dans les courbes de diffusion des rayons X à petits angles (SAXS) a confirmé l’existence de la structure semi-cristalline du PEO1900 dans une région de température entre -100 °C < T < Tf. Tous les échantillons, non-dopés et dopés avec les ions Li+ et Eu3+, ont montré un pic de corrélation indiquant que la nano-structure de la matrice hybride n´est pas affecté par le dopage avec les cations métalliques. Les études par Spectroscopie Infrarouge à Transformée de Fourier (FTIR) et par spectroscopie Raman ont confirmé l´interaction des ions Eu3+ avec l´oxygène du type carbonyle présent dans les groupes urées de la matrice hybride, et des ions Li+ avec l´oxygène du type éther. La photodégradation accélérée a révélé une perte des performances de la photo-luminescence (PL) associée à des changements dans la coordination des ions Eu3+ avec la matrice hybride. La photodégradation induit la formation de photo-produits venant de la β-scission du macroradical formé dans la portion organique de la matrice hybride. La β-scission peut-être responsable pour la diminution de la PL du matériau dû la perte de l´efficacité de l´effet antenne du ligand organique pour le centre luminescent. La transition dans la région visible du rouge vers le bleu avec la photodégradation qualifie ces matériaux de bons candidats pour l'application comme capteurs et marqueurs optiques. La conduction ionique des matrices hybrides dopés avec Li+ a été évaluée par Spectroscopie d´Impédance en fonction de la température et les résultats ont révélé des corrélations entre la superstructure lamellaire du PEO1900 et le mécanisme de conduction. L´addition d´un plastifiant, le PPO2000, a permis l´augmentation de la conductivité ionique dans une région de température entre -100 °C < T < 10 °C dû à l´augmentation de la portion amorphe utilisée comme chemin de transport ionique efficace dans le mélange polymère hybride U-xPEO1900/U-1-xPPO2000. / In this PhD thesis a greener synthesis route via sol-gel reactions aiming to prepare multifunctional organic-inorganic hybrid (OIH) materials based on blending of two polyether amine end chains (i.e., Jeffamine® compounds) Poly(ethylene oxide) (PEO) and Poly(propylene oxide) (PPO) covalently bonded with an ureasil cross-linking agent (U) is reported. Due to the different polar oxygen sites present in this OIH material, several metallic cations can to be introduced into the OIH matrix via ether- or carbonyl-type oxygen. So, different OIH matrices containing Eu3+ or Li+ cations were synthetized to evaluate their potential as photoluminescent or ionic conductor material, respectively. The thermal and structural characteristics of the Eu3+ or Li+ – loaded OIH materials, as well as the plasticizer effect of PPO2000 at the U-xPPO2000:/U-1-xPEO1900, (PPO2000 fraction x = 0.2, 0.5 and 0.8) blends, were carried out by DSC and SAXS. DSC results revealed a unique glass transition temperature (Tg) for all the studied OIH materials. The addition of Eu3+ cations do not change the Tg values while the Li+ cations caused an increase in the values of Tg, due to the Li+ interaction with the polymeric phase of the material. The U-PEO1900 calorimetric curves also showed the presence of an endothermic peak at 25 °C associated to the fusion of the crystalline domains of PEO1900. The second maxima observed in the curves of small angle X-ray scattering (SAXS) confirmed the presence of the crystalline structure of PEO1900 in a temperature range of -100 < T < Tf. All the samples, undoped and Li+ or Eu3+ doped ones, showed a correlation peak indicating that the OIH nano-structure is not affected by the metallic cations doping. Analysis carried out by Fourier Transform InfraRed (FTIR) and Raman Spectroscopy confirmed the Eu3+ cations interaction via the oxygen carbonyl-type present in the urea groups of the hybrid matrix, and that of Li+ cations with the oxygen ether-type. The accelerate photo-degradation revealed a loss of the photo-luminescence (PL) efficiency due to the changes in the Eu3+ cations coordination with the hybrid matrix. The photo-degradation induces the formation of photo-products from the macro-radical β-scission formed in the organic fraction of the hybrid matrix. The β-scission can be responsible for the material PL decrease due to the drop in the antenna effect from organic ligand to luminescent center. The visible emission transition from red → blue with the photo-degradation qualify these materials as good candidates to be applied as sensors and optical markers. The ionic conduction of the Li+-loaded hybrid matrices was investigated by Impedance Spectroscopy as a function of the temperature. Results showed a correlation between the lamellar superstructure of the PEO1900 and the conducting process. The plasticizers addition (PPO2000) alloyed to improve the value of the ionic conductivity in the low temperature range, -100 °C < T < 10 °C due to the increase of the amorphous fraction used as effective ionic transport pathway in the U-xPEO1900/U-1-xPPO2000 polymeric hybrid blend.

Orientador : Celia Marina de Alvarenga Freire / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-06T16:45:17Z (GMT). No. of bitstreams: 1 Souza_MariaElizianePiresde_D.pdf: 6548696 bytes, checksum: a583e3d7f5ab6c842a79ec6878142db1 (MD5) Previous issue date: 2006 / Resumo: As características protetoras das superfícies de aços galvanizados são geralmente intensificadas através da passivação por cromo hexavalente (Cr+6). Porém, por ser este um elemento tóxico, vários estudos visando a substituição do procedimento de cromatização vêm sendo realizados. As resinas de polissiloxanos e materiais híbridos organo-inorgânicos preparados pelo processo sol-gel, podem vir a ser um excelente substituinte ao processo de cromatização. Neste trabalho, filmes híbridos organo-inorgânico e filmes de silicone foram aplicados em aço galvanizado e em camadas de Zn-Fe. Os revestimentos foram então avaliados através de Espectroscopia de Impedância Eletroquímica. Os dados obtidos pela Espectroscopia foram modelados através de um circuito equivalente, permitindo a obtenção dos parâmetros eletroquímicos para os sistemas avaliados. Além disso, o potencial em circuito aberto, para os diferentes sistemas, foi monitorado durante processo de desgaste em sistema pino-disco em solução de NaCI 3%. Os revestimentos foram comparados em termos de resistência à corrosão e coeficiente de fricção. Os resultados mostram um bom desempenho para os revestimentos como protetores de corrosão e o comportamento destes mostraram-se dependente do tipo de revestimento metálico que foi aplicado no aço / Abstract: Chromating pre-treatments have been widely used to improve galvanized steel corrosion resistance. However, due to the high toxicity of chromate ions, chromatation pre-treatments tend to be banned and, in last years, alternative coating systems are under investigation. Recently, polysiloxanes and hybrids materiais by the sol-gel process have been extensively investigated. These materiais may be considered as promising substitutes for chromatation pre-treatments. In this work organic-inorganic hybrid materiais and silicone films have been prepared and applied on galvanized steel and on steeJ electroplated with a Zn-Fe alloy. Electrochemical Impedance Spectroscopy (EIS) was used as a technique for the evaluation of the corrosion mechanisms of the coating systems and the EIS data was fitted to an equivalent circuit from which the electrochemical parameters were obtained. Additionally, the evolution of open circuit potential, for samples, was monitored during alternative reciprocating sliding against an alumina pin in a 3% NaCl solution. The behaviour of the coatings has been compared in terms of corrosion potential and friction coefficient. Results show the protective character of the hybrid films and silicon resin films, when compared with uncovered specimens. The overall performance of the coating systems appears to be highly dependent on the type of metallic coating applied to the steel / Doutorado / Materiais e Processos de Fabricação / Doutor em Engenharia Mecânica

This thesis deals with the conformation and phase-transitions in anchored alkyl chain bilayer assemblies in organic-inorganic hybrids. The alkyl chain bilayers in organic-inorganic hybrids bear a striking resemblances to the lipid bilayers that are an integral part of biomembranes. However, unlike the lipid bilayer where individual lipid molecules can undergo the total absence of translational mobility. The anchored bilayer are, therefore, the simplest model system for understanding the structure, organization and thermal behaviour of alkyl-chain assemblies. The anchored bilayer in the organic-inorganic hybrids also offer the advantage that unlike the lipid bilayers that are essentially fluid like, these are solids and therefore, amenable to study by a variety of solid-state spectroscopic techniques. The objective of the present works was to determine the organization, conformation and thermal behaviour of alkyl chains in these class of materials- the alkyl ammonium layered pervoskites and in zinc soaps of saturated and unsaturated fatty acids. The preparation, conformation and orientation of alkyl chains assemblies in the layered(CH3CH2)nNH3)2PbI4 is described in chapter 2 and the phase-transitions and associated changes in conformation in presented in chapter 3. In chapter 4 the preparation, structure, conformation and phase-transitions of alkyl chains in the m = 2 member of the layered (CH3NH3)m-1(CH3CH2)nNH3)2PbmI3m+1 Ruddleson-Popper series is discussed. The thermal behavior of zinc soaps of saturated fatty acids is discussed in chapter 5 and formation and phase-transitions in solid solution between saturated zinc soaps of differing chain lengths, zinc stearate and zinc myristate is presented in chapter 6. The effect of a rigid link or double bond on the evolution of conformational disorder and phase-transitions of other-wise flexible hydrocarbon chains is explored in chapter 7 by comparing the thermal behavior of zinc oleate and zine elaidate with that of zinc stearate. A unique feature of the zinc soaps is that they form solid solutions over the entire composition range feature of the zinc soaps is that they form solid solutions over the entire composition range between soaps of saturated and unsaturated fatty acids. The formation and conformation of alkyl chains in the solid solution of zinc stearate and zinc oleate is discussed in chapter 8.

Made available in DSpace on 2016-12-08T17:19:34Z (GMT). No. of bitstreams: 1 01_Capa_Sumario.pdf: 97224 bytes, checksum: 84cdd855f48b9820d3374a610091b98c (MD5) Previous issue date: 2010-02-19 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The main goal of this work was the synthesis of silsesquioxane oligomers containing amine and phenyl groups, and the subsequent formation of an organic-inorganic hybrid by reaction of amine groups of the silsesquioxane precursor with the epoxy rings of bisphenol A diglycidyl ether (BADGE). The sol-gel process adopted in the oligomers syntheses proved to be efficient for the condensation reaction between 3-aminopropyltriethoxysilane and phenyltriethoxysilane. Epoxy-silsesquioxane hybrids prepared from oligomers with different condensation degrees were studied. These matrices were further reinforced with 0.25 % (w/w) of multi-walled carbon nanotube (MWCNT). Resin transfer molding (RTM) was also used to produce reinforced nanocomposites with carbon fiber (CF) and MWCNT (0.25 and 0,50 % (w/w)). Liquid state 29Si nuclear magnetic resonance analysis indicated that T3 structure is the major phase forming the synthesized oligomer. Infrared spectroscopy analyses confirmed the formation of epoxy-copolysilsesquioxane hybrid and showed that a high degree of cure was achieved after the addition of an aliphatic polyamine, however, an increase in thermal stability of produced hybrids was not observed. Glass transition temperatures (Tg) obtained by dilatometry and DMA did not show a trend of increase or decrease in this property for the produced hybrids by casting. The cured hybrids presented a brittle type fracture, similar to epoxy resin. The addition of MWCNT to the hybrid matrix did not influence the tensile mechanical properties (Young modulus and tensile strength) and caused a reduction in the Tg of the nanocomposites. Good wettability of CF by resin was observed in the nanocomposites obtained by RTM, providing significant increases in mechanical properties under tensile and impact, however, the Tg s decreased by 30 % in relation to epoxy. Unlike casting molding, the addition of MWCNT in the RTM process provided a significant increase in the mechanical properties analyzed. / Este trabalho teve por objetivo a síntese de oligômeros de silsesquioxanos contendo grupos amino e fenil, e a posterior formação de um híbrido orgânico-inorgânico pela reação dos grupos amino do precursor silsesquioxano com o anel epoxídico da resina diglicidil éter de bisfenol A (DGEBA). O processo sol-gel adotado na síntese dos oligômeros demonstrou ser eficiente na reação de condensação entre o 3-aminopropiltrietoxissilano e feniltrietoxissilano. Matrizes híbridas com silsesquioxanos de diferentes graus de condensação foram estudadas. A estas matrizes foram adicionados 0,25 % (m/m) de nanotubos de carbono de paredes múltiplas (MWCNT). A moldagem por transferência de resina (RTM) foi utilizada na produção de nanocompósitos reforçados com fibra de carbono (CF) e MWCNT (0,25 e 0,50 % (m/m)). Análise de ressonância magnética nuclear 29Si em solução revelou que o sítio T3 é a maior fase constituinte do oligômero sintetizado. Espectroscopia de infravermelho confirmou a formação do híbrido epóxidocopolissilsesquioxano e mostrou que um alto grau de cura foi atingido após a adição de uma poliamina alifática, contudo, não se observou aumento na estabilidade térmica dos híbridos produzidos. As temperaturas de transição vítrea (Tg) obtidas por dilatometria e DMA não apresentaram uma tendência de aumento ou decréscimo nesta propriedade dos híbridos produzidos por casting. Os híbridos curados apresentaram caráter de fratura do tipo frágil, semelhante à resina epoxídica. A adição de MWCNT às matrizes híbridas não influenciou as propriedades mecânicas sob tração (módulo de elasticidade e tensão máxima) e provocou uma diminuição da Tg nos respectivos nanocompósitos. Uma boa molhabilidade das CF pela resina foi observada nos nanocompósitos obtidos por RTM proporcionando aumentos expressivos nas propriedades mecânicas sob tração e impacto, contudo, as Tg s apresentaram uma queda de 30 % em relação ao epóxido. Ao contrário da moldagem por casting, no RTM a adição de MWCNT proporcionou aumentos significativos nas propriedades mecânicas analisadas.

Orientador: Sidney José Lima Ribeiro / Resumo: Este trabalho descreve o desenvolvimento de membranas de cellulose bacterianas (BCM), econômicas e ecologicamente amigáveis com propriedades funcionais. Nanopartículas de sílica esféricas com tamanho de partícula de cerca de 51 ± 4 nm, obtidas pelo método sol-gel e nanopartículas de sílica com tamanho de partículas heterogêneo, extraídas da casca de arroz, foram preparadas e funcionalizadas pelas metodologias in situ e post-grafting, respectivamente, com alcoxisilanos com propriedades easy-cleaning e curcuma. Nanocompósito de anatase SiO2@TiO2 preparado pelo método sol-gel, também foi desenvolvido. Posteriormente, estes nanomateriais funcionais e os organosilanos 1,4 – bis(trietoxissilil)benzeno (BTEB), Bis(trietoxisililpropil)disulfeto (BTPD) and 1,2-Bis(trietoxissilil)etano (BTSE), foram imobilizados com sucesso na BCM, segundo as metodologias in situ e post-grafting. Na BCM funcionalizada com os organosilanos BTEB, BTPD e BTSE, nanopartículas de sílica esféricas com estrutura porosa e distribuição de tamanho de partícula heterogêneo, foram formados nas fibras de celulose. A repelência da BCM funcionalizado com nanopartículas de sílica contendo propriedades de limpeza facilmente melhorada notavelmente. BCM apresenta fobicidade à água, tolueno, cicloexano e solução de suor artificial. Especificamente, a BCM funcionalizada com a amostra SiO2@F13TES segundo as metodologias in situ e post-grafting, apresentam uma superfície quase superhidrofóbica (> 150°). As medições de decomp... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: This work reports the development of economic and environmentally friendly Bacterial Cellulose Membrane (BCM) with functional properties. The spherical mesoporous silica nanoparticles with average particle size around 51 ± 4 nm, obtained by sol-gel method and spherical silica nanoparticles with heterogeneous particles size distribution (20-40 nm) obtained through agro-industrial waste were prepared and functionalized by in situ and post-grafting methodology, respectively, with alkoxysilanes with easy-cleaning properties and natural dye obtained through natural extracts, namely curcuma. Anatase TiO2@SiO2 spherical nanocomposites prepared by the sol-gel method, have also been developed. Subsequently, these functional nanomaterials and the organosilanes 1,4 – bis(triethoxysilyl)benzene (BTEB), Bis(triethoxysilylpropyl)disulfide (BTPD) and 1,2-Bis(triethoxysilyl)ethane (BTSE), were successfully incorporated into BCM, by in situ and post-grafting methodologies. In the BCM functionalized with BTEB, BTPD and BTSE, spherical silica nanoparticles with porous structure and heterogeneous particle size, were formed on the cellulose fibers. The surface repellency of the functionalized BCM with silica nanoparticles containing easy-cleaning properties was remarkably enhanced. This BCM displaying phobicity to water, toluene, cyclohexane and artificial sweat. Specifically, the BCM functionalized by in situ and post-grafting with SiO2@F13TES, displayed a surface almost superhydrophobic (> 150°... (Complete abstract click electronic access below) / Doutor