<p> The exploration of cathode materials and fabrication methods plays an important role in the development of solid oxide fuel cell (SOFC) technology. The objective of this study is first to optimize the cathode microstructure by the impregnation method, and then investigate the potential application of copper manganese spinel as a new cathode material with optimized microstructure and explore the reaction mechanism of the cathodes.</p> <p> The impregnation method was employed to fabricate a composite cathode with electrocatalyst particles dispersed in a framework of electrolyte material. The impregnation method is relatively easy to apply and yield the optimized microstructure, allowing extended three phase boundary length and absence of secondary phase formation during fabrication.</p> <p> The polarization performance of copper manganese spinel (CMO) impregnated YSZ cathodes was examined by adjusting catalyst particle size, electrode thickness and catalyst content. A critical thickness of 16.9±2.0 μm for the CMO-YSZ composite cathode was calculated from Tanner's model. Decreased catalyst particle size and a thickness close to the critical value were found to eliminate polarization loss. The composite cathode with 50 wt% CMO impregnation showed a polarization resistance as low as 0.3 Ωcm^2 at 750°C. At 800°C, an SOFC with CMO-YSZ composite cathode had a power density of 172 mW/cm^2, which was 2.5 times higher than the cell with the traditional LSM-YSZ composite cathode under the same conditions.</p> <p> The cathode reaction mechanism of CMO-YSZ and strontium doped lanthanum ferrite (LSCF) impregnated Gd doped ceria ( CGO) composite cathodes was studied, using impedance spectroscopy, cyclic voltammetry and current interruption techniques. Surface diffusion and mass transfer were determined to be the rate controlling steps for CMO-YSZ composite cathode at low and high temperatures, respectively. A low frequency process at low temperatures and at least two processes at high temperatures were identified as rate determining steps of LSCF -CGO composite cathodes. A cathodic current activation effect was observed on CMO-YSZ cathode under current passage. The catalytic activity of CMO was enhanced by the cathodic current and the effect existed in both long-term and short-term experiments.</p> <p> The results of this study suggest that copper manganese spinel has attractive properties as a new catalyst material for the cathodic reaction with the composite structure obtained by the impregnation method.</p> / Thesis / Master of Applied Science (MASc)

With advantages of high cation exchange capacity, swelling-shrinking property and large specific surface area, monmtorillonite is chosen as a carrier and modified with Fe3+ saturation for estrogen decontamination. 17β-Estradiol (βE2) has highest estrogenic activity among estrogens and is selected as representative compound. Rapid βE2 transformation in the presence of Fe3+ - saturated montmorillonite in aqueous system was observed and βE2 oligomers were the major βE2 transformation products. About 98% of βE2 were transformed into oligomers which are >107 times less water-soluble than βE2 and therefore are much less bioavailable and mobile. Fe3+ -saturated montmorillonite catalysis achieved highest βE2 removal efficiency at neutral solution pH and higher temperature. Common cations did not have impact on the reaction efficiency. Dissolved organic matter slightly reduced βE2 removal efficiency. Regardless of wastewater source, ~40% βE2 removal efficiency was achieved for wastewater effluents when they were exposed to same dosage of Fe3+ -saturated montmorillonite as that for simple water systems which achieved ~83% removal efficiency. For real wastewater that contained higher organic matter, higher dosage of Fe3+ -saturated montmorillonite would be needed to create available reaction sites for βE2. This thesis also reports that Fe3+ -saturated montmorillonite effectively deactivate wastewater microorganisms. Microbial deactivation rate was 92±0.6% when secondary wastewater effluent was mixed with Fe3+ -saturated montmorillonite at 35 mg/mL for 30 min, and further increased to 97±0.6% after 4-h exposure. Freeze-drying Fe3+ -saturated montmorillonite iii after each usage resulted in 82±0.5% microbial deactivation efficiency even after fourth consecutive use. For convenient application, Fe3+ -saturated montmorillonite was further impregnated into filter paper through wet-end addition and formed uniformly impregnated paper. Scanning electron microscopy (SEM) imaging showed Fe3+ -saturated montmorillonite was evenly dispersed over cellulose fiber surface. When filtering 50 mL and 200 mL water spiked with live Escherichia coli (E. coli) cells at 3.67×108 CFU/mL, Fe3+ -saturated montmorillonite impregnated paper with 50% mineral weight loading deactivated E. coli with 99% and 77%, respectively. Dielectrophoresis and impedance analysis of filtrate confirmed that the deactivated E. coli passing through Fe3+ -saturated montmorillonite paper did not have trapping response due to higher membrane permeability and conductivity. The results demonstrate feasibility of using Fe3+ -saturated montmorillonite impregnated paper for convenient point-of-use drinking water disinfection. / Ph. D. / In this thesis, Fe³⁺-saturated montmorillonite was produced in an eco-friendly way to serve as cost-effective material for both efficient estrogen removal and microbial deactivation from wastewater. 17β-Estradiol (βE2), a common estrogen compound, was quickly removed by Fe³⁺- saturated montmorillonite and the transformation products could be easily settled down from wastewater and became less bioavailable. Fe³⁺-saturated montmorillonite also demonstrated durability over different environmental conditions in wastewater and still achieved satisfied βE2 removal efficiency. Moreover, Fe³⁺-saturated montmorillonite could rapidly deactivate the microbes in wastewater effluent and can be promising wastewater disinfection method in the future. Fe³⁺ -saturated montmorillonite immobilized filer paper was also produced and has great potential to be used as a cost-effective filtration purifier for safe drinking water.

<p>Catalysts play an essential role in nearly every chemical production process. Platinum supported on high surface area carbon substrates (Pt/C) is one of the promising candidates as an electrocatalyst in low temperature polymer electrolyte fuel cells. Developing the activity of the Pt/C catalyst with narrow Pt particle size distribution and good dispersion has been a main concern in current research.</p> <p><br /> In this study, the main objective was the development and characterization of inexpensive and effective nanophase Pt/C electrocatalysts. A set of modified Pt/C electrocatalysts with high electrochemical activity and low loading of noble metal was prepared by the impregnation-reduction method in this research. The four home-made catalysts synthesized by different treatments conditions were characterized by several techniques such as EDS, TEM, XRD, AAS, TGA, BET and CV.</p> <p><br /> Pt electrocatalysts supported on acid treatment Vulcan XC-72 electrocatalysts were produced successfully. The results showed that Pt particle sizes of Pt/C (PrOH)x catalysts between 2.45 and 2.81nm were obtained with homogeneous dispersion, which were more uniform than the commercial Pt/C (JM) catalyst. In the electrochemical activity tests, ORR was confirmed as a structure-sensitive reaction. The Pt/C (PrOH/pH2.5) showed promising results during chemically-active surface area investigation, which compared well with that of the commercial standard Johnson Matthey Pt/C catalyst. The active surface area of Pt/C (PrOH/pH2.5) at 17.98m2/g, was higher than that of the commercial catalyst (17.22 m2/g ) under the conditions applied. In a CV electrochemical activity test of Pt/C catalysts using a Fe2+/Fe3+ mediator system study, Pt/C (PrOH/pH2.5) (67mA/cm2) also showed promise as a catalyst as the current density is comparable to that of the commercial Pt/C (JM) (62mA/cm2).</p> <p><br /> A remarkable achievement was attained in this study: the electrocatalyst Pt supported on CNTs was synthesized effectively. This method resulted in the smallest Pt particle size 2.15nm. In the electrochemically-active surface area study, the Pt/CNT exhibited a significantly greater active surface area (27.03 m2/g) and higher current density (100 mA/cm2) in the Fe2+/Fe3+ electrochemical mediator system than the other home-made Pt/C catalysts, as well as being significantly higher than the commercial Pt/C (JM) catalysts. Pt/CNT catalyst produced the best electrochemical activities in both H2SO4 and K4[Fe(CN)6] electrolytes. As a result of the characteristics of Pt/CNT，it can be deduced that the Pt/CNT is the best electrocatalyst prepared in this study and has great potential for use in fuel cell applications.</p>

L’industrie aéronautique a exprimé un besoin en matériaux pour des zones fortement chargées thermiquement et mécaniquement. L’objectif est d’optimiser grâce à ces matériaux, notamment en termes de poids et de rendement, le coeur des turboréacteurs. Un procédé par voie liquide appelé «Reactive Melt infiltration» est industriellement envisagé pour fabriquer ces matériaux. La densification est tributaire de la compétition entre la montée capillaire et la réaction chimique entre le silicium liquide et la poudre préalablement introduite. Cette concurrence peut conduire à des phénomènes de «choking off» qui doivent être évités. Dans ce travail, l’approche numérique est à la fois macroscopique et microscopique. Des validations numériques, des applications dans le cadre de géométries modèles et des analyses physiques sont présentées pour les deux échelles. Les simulations d’imbibition réactive à l’échelle de la pièce sont effectués avec un outil développé au sein de SAFRAN alors que les simulations de montées capillaires dans des géométries modèles à l’échelle du pore sont réalisées avec le code de calcul Thétis (développé à l’I2M, Bordeaux). Une méthodologie expérimentale pour le suivi et l’analyse de l’imprégnation capillaire réactive d’un milieu granulaire constitué de matériaux modèles est également présentée. / The development of ceramic matrix composites (CMCs) to replace certain metal components ininternal hot parts of aircraft engines is an active research field for the aeronautical industry. Theseadvanced components may be manufactured with a fluid processing called ReactiveMelt Infiltration(RMI). The densification step is the capillary rise of a molten metal such as silicon within a wovenpreform. The molten metal can react with the previously introduced ceramic powder and lead to arefractory matrix. The competition between capillary rise and the reaction between molten siliconand introduced carbon powder has to be managed. The ambition is to prevent choking off effectsand closed pores created by preferential paths. Simulations of two-phase flows at macroscopic scaleare undertaken with a homemade code developed in SAFRAN whereas simulations of two-phaseflows atmicroscopic scale were undertaken with CFD code Thétis (developed at I2M, Bordeaux). Anexperimental methodology for analysis of reactive or not reactive capillary impregnation in granularmedia is described.

Student Number : 0303610W - PhD thesis - School of Chemistry - Faculty of Science / Mesoporous MCM-48 was synthesized and used as a template to synthesize mesoporous carbon (MC) materials. Polystyrene, the carbon source, together with sulfuric acid and toluene were added to the template (160 oC for 6 h) and this procedure generated a low surface area carbon supported/MCM-48 material. A repeat addition and carbonization step was needed to form the precursor carbon/MCM-48 material that was pyrolysed at 900 oC to generate graphitic mesoporous carbon materials. After removal of the silica template, mesoporous carbons were characterized by XRD, HR-TEM, Raman spectroscopy and surface area analysis. The effect of the amount of polystyrene as well as the role of the pyrolysis temperature on the final product was investigated. This synthesis methodology can readily be controlled to produce partially ordered graphitic mesoporous carbon supports with predictable pore width and surface area. The methane selectivity was low (below 6%) and stable, and the overall olefin fraction was found to be good for all the supported catalysts studied. The potassium promoter increased the hydrocarbon chain growth to C68 giving α-1 and α-2 both between 0.79 and 0.90 for all supported catalysts with an exception of MCM-48 supported Fe catalyst that selectively produced hydrocarbons up to C28.

O objetivo desta pesquisa foi estudar a formação de partículas de licopeno em pó de colágeno hidrolisado (CH) comercial usando CO2 supercrítico (CO2-SC). O estudo consistiu em três etapas: a medida de solubilidade do CH em CO2-SC por método estático para conhecer a afinidade do CH pelo CO2, a formação de partículas de misturas físicas compostas de diferentes proporções de CH/licopeno (4:1, 6:1, 8:1 e 10:1) através de processamento em uma autoclave com CO2-SC a 140 bar e 50 °C em agitação de 1.250 rpm por 45 min para definir a proporção de CH/licopeno, e o estudo do efeito de outras condições de CO2-SC (150 bar e 50 °C, 150 bar e 60 °C, 250 bar e 50 °C, 250 bar e 60 °C) na formação de partículas de licopeno em CH para identificar a melhor condição de CO2-SC. As partículas resultantes foram caracterizadas com relação à sua morfologia por microscopia eletrônica de varredura, distribuição de tamanho por difração a laser, comportamento térmico por calorimetria diferencial de varredura, estrutura química por espectroscopia de infravermelho de transformada de Fourier, liberação de carga, e estrutura física interna das partículas por microscopia de laser confocal para conhecer o mecanismo de formação das partículas pelo processamento com CO2-SC. Os resultados indicaram que o CH é pouco solúvel em CO2-SC, motivo pelo qual não há potencial para processos de micronização supercrítica relacionados à solubilidade do biomaterial carreador em CO2-SC. No estudo de proporções de CH/licopeno foi observado que o processo com CO2-SC a 140 bar e 50 °C permite a obtenção de partículas de licopeno em CH na forma de pó de coloração vermelha com intensidade dependente da quantidade de licopeno inicial, sem mudanças importantes na estrutura física porosa do CH, e um aumento de tamanho das partículas. Recomenda-se a proporção 10:1 de CH/licopeno, pois nela se evidenciou menor aglomeração de partículas e formação de fissuras na superfície das partículas que facilitam a incorporação do licopeno em CH seguindo um mecanismo de impregnação supercrítica propiciado pela sorção de CO2 e arraste simultâneo de licopeno ao interior da estrutura física das partículas de CH. Na exploração de outras condições de CO2-SC, na temperatura de 60 °C (150/250 bar) obteve-se uma massa de aparência viscoelástica sem utilidade para a formação de partículas. Entanto, na temperatura de 50 °C foi observado que as partículas de licopeno em CH formadas com CO2-SC a 150 bar, quando comparadas com as formadas com CO2-SC a 250 bar, evidenciaram formação de fissuras que resultaram na melhor dispersão e maior carga de licopeno na estrutura interna do CH. Além disso, as análises do comportamento térmico e o espectro de infravermelho destas partículas evidenciaram a formação de interações eletrostáticas entre o licopeno e o CH favorecidas pelo processamento com CO2-SC. Assim, conclui-se que o processamento com CO2-SC a 140/150 bar e 50 °C poderia ser utilizada para o design de partículas de licopeno impregnadas em CH, gerando um ingrediente com possível ampla atividade funcional pela atividade biológica do CH em tecidos conjuntivos e pela atividade antioxidante do licopeno. / The objective of this research was to study the formation of lycopene particles in commercial powder of hydrolyzed collagen (HC) using supercritical CO2 (SC-CO2). The study consisted of three steps: the solubility measurement of HC in SC-CO2 by static method to know the affinity of HC by CO2, the formation of particles of physical mixtures composed of different ratios of HC/lycopene (4:1, 6:1, 8:1 and 10:1) by autoclaving with SC-CO2 at 140 bar and 50 °C under stirring at 1,250 rpm for 45 min to define the HC/lycopene ratio, and the study of the effect of other conditions of SC-CO2 (150 bar and 50 °C, 150 bar and 60 °C, 250 bar and 50 °C, 250 bar and 60 °C) in the particle formation of lycopene in HC to identify the best SC-CO2 condition. The resulting particles were characterized with respect to their morphology by scanning electron microscopy, size distribution by laser diffraction, thermal behavior by differential scanning calorimetry, chemical structure by Fourier transform infrared spectroscopy, charge release, and physical structure of the particles by confocal laser microscopy to know the mechanism of particle formation by SC-CO2 processing. The results indicated that HC is poorly soluble in SC-CO2 and therefore has no potential for supercritical micronization processes related to the solubility of the biomaterial in SC-CO2. In the study of ratios of HC/lycopene it was observed that the process with SC-CO2 at 140 bar and 50 °C allowed to obtain lycopene particles in HC with powder appearance of red color with intensity depending on the amount of initial lycopene, without important changes in the porous physical structure of HC, and an increase in particle size. It is recommended a 10:1 ratio of HC/lycopene, since this ratio showed less particle agglomeration, and formation of fissures on the surface of the particles facilitating the incorporation of lycopene into HC following a mechanism of supercritical impregnation propitiated by CO2 sorption and simultaneous drag of lycopene to the interior of the physical structure of the HC particles. In the exploration of other conditions of SC-CO2, at 60 °C (150/250 bar) a mass of viscoelastic appearance was obtained without utility for the formation of particles. However, at 50 °C was observed that the lycopene particles in HC formed with SC-CO2 at 150 bar, when compared with the particles formed with SC-CO2 at 250 bar evidenced the formation of fissures, which had positive influence in the dispersion and charge of lycopene in the internal structure of HC. In addition, analyzes of the thermal behavior and the infrared spectrum of these particles evidenced the formation of electrostatic interactions between lycopene and HC favored by SC-CO2 processing. Thus, it can be concluded that SC-CO2 processing at 140/150 bar and 50 °C could be used for the design of lycopene particles impregnated in HC, producing an ingredient with possible broad functional activity due to the biological activity of HC in connective tissues and the antioxidant activity of lycopene.

Made available in DSpace on 2017-07-21T20:42:33Z (GMT). No. of bitstreams: 1 Juliana de Oliveira Pimenta.pdf: 2102034 bytes, checksum: c49b6619822775178bcdf4c3da21de3c (MD5) Previous issue date: 2011-01-18 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This work presents a study on the preparation of titanium dioxide thin films (TiO2) on a substrate of glass slides using the forced impregnation method for control of pressure and temperature. A temperature of 320 ° C with a constant pressure of 1,80 MPa was used to prepare the films; the samples were exposed for 24 hours at this condition. The films were characterized by X-ray diffraction which confirmed the presence of TiO2 on the surface of the substrate and the morphology was analyzed by conventional and field-emission gun scanning electron microscopy. The films of titanium dioxide were used for bacteriological testing. The controlled variables in the bacteriological tests were: the temperature for bacterial growth, growth time, sterilization of the environment and materials and quality of bacterial medium cultures. The bioactivity of TiO2 was tested with Escherichia coli by standard method, with growth in an oven for 24h at 37 °C and analyzed by absorption spectrophotometry with readings in the range of 600nm. The films showed effective bacteriostatic by growth inhibiting the growth of Escherichia coli compared to substrates without film. (Σlog Abs = 73,7 with film against Σlog Abs = 75,0 without thin film E ±10-1). / Neste trabalho foi desenvolvido um estudo sobre a preparação de filmes finos de dióxido de titânio (TiO2) em substrato de lamínulas de vidro utilizando o método de impregnação forçada por controle de pressão e de temperatura. Para a preparação dos filmes, utilizou-se a temperatura de 320ºC com pressão constante de 1,80 MPa exposto por período de 24 horas. Os filmes obtidos foram caracterizados por difração de raios X que confirmaram a presença de TiO2 na superfície dos substratos e, a morfologia, analisada por microscopia eletrônica de varredura convencional e por força de campo de emissão. Os filmes de dióxido de titânio foram utilizados para ensaios bacteriológicos. As variáveis controladas nos ensaios bacteriológicos foram à temperatura para o crescimento das bactérias, o tempo de crescimento, a esterilização do ambiente e materiais e a qualidade das culturas de bactérias e meio estéril. A bioatividade do TiO2 foi testada com Escherichia coli por um método padrão, com crescimento por 24 h a 37 ºC e analisada por espectrofotometria de absorção com leituras na faixa de 600 nm. Os filmes mostraram eficiente poder bacteriostático inibindo o crescimento da Escherichia coli se comparado com substratos sem o filme. (Σlog Abs = 73,7 com filme contra Σlog Abs = 75,0 sem filme fino E ±10-1).

O trabalho tem por finalidade o estudo teórico e experimental de ligações em estruturas de madeira com cavilhas de madeira de seção cilíndrica impregnadas com resinas estirênicas. A impregnação da madeira tem como objetivos: diminuir o processo de degradação, retardação ao fogo, melhorar a estabilidade dimensional e aumentar as propriedades de resistência e elasticidade da madeira. Foram determinados experimentalmente as características de resistência e elasticidade do material e posteriormente realizados ensaios de ligações padronizados com solicitação paralela e normal às fibras. Os resultados dos ensaios mostram aumento na resistência de compressão normal até 292% e aumento de 80% no limite de proporcionalidade da ligação. A madeira utilizada para a impregnação foi o Pinus de reflorestamento. / The aim of this work is a theorytical and experimental studies of joints in timber structures with wooden dowels of circular cross section impregnated with styrenic resins. The objetives of wood impregnation are to decrease the deterioration process, to promote fire retardation, to improve dimensional stability and mainly increase the compression strength and stiffiness of wood. The strength and stiffness properties of the material are determined. Standard joints tests are carried out in compression both parallel and perpendicular to grains. The test results increases of compression perpendicular strength up to 292% and the up to 80% proportional limit joint. The wood used for impregnation was Pinus from reforestation sites.

Made available in DSpace on 2014-12-17T15:41:58Z (GMT). No. of bitstreams: 1 AdrianaPBS_DISSERT.pdf: 2596487 bytes, checksum: f09071ef3141cb36b73492e4246e301b (MD5) Previous issue date: 2012-03-15 / O recente interesse em se obter materiais nanoporosos funcionalizados para aplica??es como calisadores heterog?neos e adsor??o de CO2, tem aumentado no meio industrial e cientifico. Nesta ?ltima aplica??o, a introdu??o de grupos aminas, como os presentes em quitosana, em materiais nanoporosos do tipo SBA-15 para gerar intera??es espec?ficas com o CO2 tem ganhado import?ncia. Assim, neste trabalho foram realizadas a s?ntese do SBA-15 e posterior impregna??o da CS no suporte mesoporoso atrav?s do m?todo de impregna??o por via ?mida. Os materiais obtidos foram caracterizados por meio DRX, TG, DSC, MEV, FTIR e adsor??o/dessor??o de N2. Os resultados de DRX indicaram que a estrutura ordenada do suporte SBA-15 foi preservada ap?s a impregna??o e os c?lculos mostraram que o di?metro m?dio do poro e/ou a espessura m?dia da parede (wt) foram alterados devido a introdu??o da quitosana nas amostras funcionalizadas. As curvas de TG e de DSC,corroboraram com os dados de DRX, indicando a presen?a da quitosana na estrutura mesoporosa do SBA-15, assim como as micrografias das amostras funcionalizadas, que possibilitou visualizar o estado de agrega??o do material obtido. As bandas caracter?sticas de absor??o da CS na regi?o IV foram identificadas e interpretadas nas amostras funcionalizadas confirmando as outras caracteriza??es. Foi visto tamb?m que a ?rea superficial diminuiu nas amostras funcionalizadas, indicando a sucessiva incorpora??o do pol?mero no suporte mesoporoso. A energia de ativa??o do processo de degrada??o t?rmica da quitosana impregnada no suporte foi determinada por meio do m?todo de cin?tica livre de Viazovkin e pelo m?todo de Ozawa-Flay-Wall com os resultados indicando que o aumento da quitosana diminui em aproximadamente 10% a energia de ativa??o para sua degrada??o.

Made available in DSpace on 2014-12-17T15:41:59Z (GMT). No. of bitstreams: 1 AdrianaPBS_DISSERT.pdf: 2596487 bytes, checksum: f09071ef3141cb36b73492e4246e301b (MD5) Previous issue date: 2012-03-15 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The recent interest in obtaining functionalized nanoporous materials for applications such as heterogeneous catalysts and adsorption of CO2 has increased today. In the latter application, the introduction of amino groups such as present in the chitosan (CS), in the nanoporous materials like SBA-15 to generate specific interactions with CO2 has gained importance. In this work were performed to hydrothermal synthesis of SBA-15 and subsequent impregnation of the CS in the support mesoporous by the method of the wet impregnation. The materials were characterized by TG/DTG, DSC, XRD, SEM, FTIR and adsorption / desorption of N2. The XRD showed that the ordered structure of the support SBA-15 was preserved after the impregnation and calculations have shown that the average pore diameter (Dp) and / or the average wall thickness (wt) have been changed due to introduction of the CS in the samples functionalized. The curves of TG and DSC data corroborates the XRD, indicating the presence of CS in the nanoporous structure of SBA-15, as well as micrographs of samples, which allowed the display state of aggregation of the material obtained. The characteristics of bands absorption in the region of the CS in the FTIR were identified and interpreted in the samples functionalized, confirming the further characterization. Measurements showed that the BET surface area decreases in the functionalized samples, indicating the successive incorporation of the polymer in the nanoporous support. The activation energy apparent (Ea) for the process of thermal degradation of CS in the impregnated support was determined by the methods of kinetic freedom Vyazovkin and Ozawa-Flynn-Wall with the results indicating that the sample functionalized CS/SBA-15 2,5 % was decrease of the Ea in their degradation of about 10% compared to 1,0 % CS/SBA-15 sample / O recente interesse em se obter materiais nanoporosos funcionalizados para aplica??es como catalisadores heterog?neos e na adsor??o de CO2 tem aumentado atualmente. Nesta ?ltima aplica??o, a introdu??o de grupos aminas, como os presentes na quitosana (CS), em materiais nanoporosos do tipo SBA-15 para gerar intera??es espec?ficas com o CO2 tem ganhado import?ncia. Assim, neste trabalho foram realizadas a s?ntese hidrot?rmica do SBA- 15 e posterior impregna??o da CS no suporte mesoporoso atrav?s do m?todo de impregna??o por via ?mida. Os materiais obtidos foram caracterizados por meio de TG/DTG, DSC, DRX, MEV, FTIR e adsor??o/dessor??o de N2. Os resultados de DRX indicaram que a estrutura ordenada do suporte SBA-15 foram preservada ap?s a impregna??o e os c?lculos mostraram que o di?metro m?dio do poro (Dp) e/ou espessura m?dia da parede (wt) foram alterados devido a introdu??o da CS nas amostras funcionalizadas. As curvas de TG e DSC corroboraram com os dados de DRX, indicando a presen?a da CS na estrutura mesoporosa do SBA-15, assim como as micrografias das amostras funcionalizadas, que possibilitou visualizar o estado de agrega??o do material obtido. As bandas caracter?sticas de absor??o da CS da regi?o IV foram identificadas e interpretadas nas amostras funcionalizadas, confirmando as outras caracteriza??es. As medidas de BET mostraram que a ?rea superficial diminui nas amostras funcionalizadas, indicando a sucessiva incorpora??o do pol?mero no suporte nanoporoso. A energia de ativa??o aparente (Ea) do processo de degrada??o t?rmica da CS impregnada no suporte foi determinada por meio dos m?todos de cin?tica livre de Vyazovkin e de Ozawa-Flynn-Wall com os resultados indicando que a amostra funcionalizada CS/SBA-15 2,5 % teve uma diminui??o da Ea para a sua degrada??o de aproximadamente de 10% em rela??o a amostra de CS/SBA-15 1,0 %