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Made available in DSpace on 2014-12-17T15:42:27Z (GMT). No. of bitstreams: 1 KesiaKVC_TESE.pdf: 1888403 bytes, checksum: 628d99fa0e77dc19c5054fa5d201217e (MD5) Previous issue date: 2013-04-17 / In this work were synthesized and characterized the materials mesoporous SBA-15 and Al- SBA-15, Si / Al = 25, 50 and 75, discovered by researchers at the University of California- Santa Barbara, USA, with pore diameters ranging from 2 to 30 nm and wall thickness from 3.1 to 6.4 nm, making these promising materials in the field of catalysis, particularly for petroleum refining (catalytic cracking), as their mesopores facilitate access of the molecules constituting the oil to active sites, thereby increasing the production of hydrocarbons in the range of light and medium. To verify that the materials used as catalysts were successfully synthesized, they were characterized using techniques of X-ray diffraction (XRD), absorption spectroscopy in the infrared Fourier transform (FT-IR) and adsorption nitrogen (BET). Aiming to check the catalytic activity thereof, a sample of atmospheric residue oil (ATR) from the pole Guamar?-RN was performed the process by means of thermogravimetry and thermal degradation of catalytic residue. Upon the curves, it was observed a reduction in the onset temperature of the decomposition process of catalytic ATR. For the kinetic model proposed by Flynn-Wall yielded some parameters to determine the apparent activation energy of decomposition, being shown the efficiency of mesoporous materials, since there was a decrease in the activation energy for the reactions using catalysts. The ATR was also subjected to pyrolysis process using a pyrolyzer with gas chromatography coupled to a mass spectrometer. Through the chromatograms obtained, there was an increase in the yield of the compounds in the range of gasoline and diesel from the catalytic pyrolysis, with emphasis on Al-SBA-15 (Si / Al = 25), which showed a percentage higher than the other catalysts. These results are due to the fact that the synthesized materials exhibit specific properties for application in the process of pyrolysis of complex molecules and high molecular weight as constituents of the ATR / No presente trabalho foram sintetizados e caracterizados os materiais mesoporosos SBA-15 e Al-SBA-15, Si/Al= 25, 50 e 75, descobertos por pesquisadores da Universidade da Calif?rnia- Santa B?rbara- EUA, tendo di?metro de poros variando entre 2 a 30 nm e espessura das paredes de 3,1 - 6,4 nm, tornando estes materiais promissores na ?rea da cat?lise, especificamente para o refino do petr?leo (craqueamento catal?tico), j? que seus mesoporos facilitam o acesso das mol?culas constituintes do petr?leo aos s?tios ativos, aumentando assim a produ??o de produtos na faixa dos hidrocarbonetos leves e m?dios. Para verificar se os materiais utilizados como catalisadores haviam sido sintetizados com sucesso, os mesmos foram caracterizados atrav?s das t?cnicas de difra??o de raios-X (DRX), espectroscopia de absor??o na regi?o do infravermelho com transformada de Fourier (FTIR) e adsor??o de nitrog?nio (BET). Com o intuito de verificar a atividade catal?tica dos mesmos, utilizou-se uma amostra de Res?duo Atmosf?rico de petr?leo (RAT), proveniente do P?lo de Guamar?- RN, realizando-se atrav?s da termogravimetria o processo de degrada??o t?rmica e catal?tica do res?duo. Mediante as curvas obtidas, observou-se uma redu??o na temperatura de in?cio do processo de decomposi??o catal?tica do RAT. Pelo modelo cin?tico proposto por Flynn- Wall obtiveram-se alguns par?metros para determina??o da energia de ativa??o aparente das decomposi??es, ficando evidenciada a efici?ncia dos materiais mesoporosos, j? que houve uma diminui??o da energia de ativa??o para as rea??es utilizando os catalisadores. O RAT tamb?m foi submetido ao processo de pir?lise utilizando-se um pirolisador com cromatografia gasosa, acoplado a um espectr?metro de massa. Mediante os cromatogramas obtidos, observou-se um aumento no rendimento dos compostos na faixa da gasolina e diesel oriundos da pir?lise catal?tica, com ?nfase para o Al-SBA-15 (Si/Al= 25), que apresentou um percentual superior aos demais catalisadores. Esses resultados se devem ao fato dos materiais sintetizados exibirem propriedades espec?ficas, para aplica??o no processo de pir?lise de mol?culas complexas e com alto peso molecular, como os constituintes do RAT

Made available in DSpace on 2015-04-17T14:49:25Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 4903475 bytes, checksum: de295b0d0669974bfd97c402fd3bbeee (MD5) Previous issue date: 2013-05-24 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Edible oils are important sources of energy, fat soluble vitamins and essential fatty acids. However, their unsaturated fatty acids nature makes them highly susceptible to oxidative processes, making necessary the use of antioxidant additives. Synthetic antioxidants are widely employed by the industry, although there are several restrictions due to their adverse effects on human health. For this reason, this study investigated the antioxidant potential of 24 plant extracts: saffron (Crocus sativus L), rosemary (Rosmarinus officinalis), boldo (Peumus boldus Molina), white tea (Camellia sinensis (L.) Kutntze), mate tea (Ilex paraguariensis St. Hilaire), black tea (Camellia sinensis (L.) Kutntze), green tea (Camellia sinensis (L.) Kutntze), chamomile (Matricaria recutita L.), cinnamom (Cinnamomum zeylanicum), carqueja (Baccharis trimera (Less.) DC), lemon balm (Cymbopogom citratus), coriander (Coriandrum sativum L.), clove (Syzygium aromaticum), fennel (Foeniculum vulgare (Mill.) Gaertn), marjoram (Origanum majorana L.), basil (Ocimum basilicum), oregano (Origanum vulgare L. ssp Virens), senna (Cassia angustifólia), barbatimão (Stryphnodendron barbatimam Mart.), chapéu-de-couro (Echinodorus grandiflorus Mitch.), juca (Caesalpinia ferrea Mart. Ex Tul.), guarana (Paullinia cupana Kunth), pau d arco (Tabebuia serratifolia (Vahl) Nich.) and cat s claw (Uncaria tomentosa), by determining total phenolic content and antioxidant activity measured through the DPPH and FRAP assays. Thermogravimetric Analysis (TG), with both dynamic and isothermal (110 °C) analysis methods, was used to evaluate the thermal stability of the 24 plant extracts, as well as commercial antioxidants. Corn, soybean and sunflower oils, composed of unsaturated fatty acids, are widely used in Brazilian cuisine. Thus, antioxidant action of the extracts (rosemary, chamomile, coriander, fennel and senna) was also investigated by controlling the oxidative stability of edible vegetable oils when added to these, through the accelerated Rancimat methods, PetroOXY, PDSC and oven test. Clove extract showed the highest antioxidant capacity by FRAP assay and the best CFT. Extracts of juca and barbatimao, both from the Amazon Region, showed high TFC (133.63 ± 1.94 and 147.37 ± 1.99 mg GAE/g extract), confirming the excellent antioxidant capacity determined by the foregoing methods. The thermogravimetric profile of the extracts of cat's claw, saffron, rosemary, white tea and cinnamon stood out due to its good thermal resistance, indicating that may be used as antioxidant additives in formulations requiring heating. The rosemary extract applied to edible oils exhibited greater protective effect than other extracts tested, including the synthetic antioxidant BHT and TBHQ, when evaluated by the PDSC and PetroOXY methods. When the assessment was based on the Rancimat technique, its effect was similar to the one of BHT. Clove extract, although it is an excellent antioxidant, showed no thermal stability, with a mass loss of 81.4% in the first event (28.1 to 266.7 °C), due to the degradation of its main chemical constituent, eugenol. / Óleos comestíveis são fontes importantes de energia, vitaminas lipossolúveis e de ácidos graxos essenciais. Entretanto, a natureza insaturada dos seus ácidos graxos os torna altamente suscetíveis a processos oxidativos, tornando necessário o uso de aditivos antioxidantes. As indústrias de oleaginosas utilizam os de natureza sintética, todavia existem várias restrições quanto ao uso destas substâncias, devido aos efeitos nocivos atribuídos à saúde humana. Por estas razões, este trabalho investigou o potencial antioxidante de 24 extratos vegetais: açafrão (Crocus sativus L), alecrim (Rosmarinus officinalis), boldo-do-Chile (Peumus boldus Molina), chá branco (Camellia sinensis (L.) Kutntze), chá mate (Ilex paraguariensis St. Hilaire), chá preto (Camellia sinensis (L.) Kutntze), chá verde (Camellia sinensis (L.) Kutntze), camomila (Matricaria recutita L.), canela (Cinnamomum zeylanicum), carqueja (Baccharis trimera (Less.) DC), erva-cidreira (Cymbopogom citratus), coentro (Coriandrum sativum L.), cravo-da-Índia (Syzygium aromaticum), erva-doce (Foeniculum vulgare (Mill.) Gaertn), manjerona (Origanum majorana L.), manjericão (Ocimum basilicum), orégano (Origanum vulgare L. ssp Virens), sene (Cassia angustifólia), barbatimão (Stryphnodendron barbatimam Mart.), chapéu-de-couro (Echinodorus grandiflorus Mitch.), jucá (Caesalpinia ferrea Mart. Ex Tul.), guaraná (Paullinia cupana Kunth), pau d arco (Tabebuia serratifolia (Vahl) Nich.) e unha de gato (Uncaria tomentosa), através da determinação do conteúdo de fenólicos totais (CFT) (método Folin-Ciocateau) e da capacidade antioxidante aplicando os ensaios DPPH e FRAP. A análise Termogravimétrica (TG), pelos métodos dinâmicos e isotérmicos (110 °C) foi utilizada para avaliar a estabilidade térmica dos extratos vegetais e antioxidantes comerciais. Os óleos de milho, soja e girassol, constituídos de ácidos graxos insaturados, são muito utilizados na culinária brasileira. Assim, a ação antioxidante dos extratos (alecrim, camomila, coentro, erva-doce e sene) também foi investigada através do controle da estabilidade oxidativa de óleos vegetais comestíveis quando adicionados a estes, por meio dos métodos acelerados Rancimat, PetroOXY, PDSC e teste de estufa. O extrato de cravo exibiu o maior CFT e a melhor capacidade antioxidante pelo ensaio FRAP. Os extratos de jucá e barbatimão, oriundos da Região Amazônica, apresentaram altos CFT (133,63 ± 1,94 e 147,37 ± 1,99 mg EAG/g de extrato) confirmando a excelente capacidade antioxidante pelos métodos empregados. O perfil termogravimétrico mostrou que os extratos unha-de-gato, açafrão, alecrim, chá branco e canela destacaram-se por apresentar boa resistência térmica, indicando que podem ser utilizados como aditivos antioxidantes em formulações que necessitem de aquecimento. O extrato de alecrim aditivado nos óleos vegetais exibiu um efeito protetor superior aos demais extratos antioxidantes testados, inclusive aos sintéticos BHT e TBHQ quando avaliados pelos métodos PDSC e PetroOXY e efeito semelhante ao do BHT pela técnica Rancimat. O extrato de cravo, embora seja um excelente antioxidante, não apresentou estabilidade térmica, com perda de massa de 81,4% na primeira etapa (28,1 a 266,7 ºC), relativa à degradação do constituinte químico principal, o eugenol.

Submitted by Emanuel Varela Cardoso (emanuel.varela@ufcg.edu.br) on 2018-06-25T20:43:17Z No. of bitstreams: 1 DIVÂNIA FERREIRA DA SILVA – TESE (UAEMa) 2015.pdf: 6209897 bytes, checksum: dff0cafabba0ab449d69fdaef6faf3af (MD5) / Made available in DSpace on 2018-06-25T20:43:17Z (GMT). No. of bitstreams: 1 DIVÂNIA FERREIRA DA SILVA – TESE (UAEMa) 2015.pdf: 6209897 bytes, checksum: dff0cafabba0ab449d69fdaef6faf3af (MD5) Previous issue date: 2018-06-25 / Capes / O objetivo deste trabalho foi desenvolver blendas de poliestireno/composto de resíduo de borracha de estireno-co-butadieno (PS/SBRr) da indústria calçadista visando tenacificar o PS e reaproveitar o SBRr. As blendas foram preparadas nas composições (70/30; 60/40 e 50/50%) em massa e com 5% do compatibilizante estireno-butadieno-estireno (SBS). A fim de se estudar o efeito da sequência de mistura, escolheu-se a composição 50/50% que apresentou o melhor resultado de resistência ao impacto. As sequências realizadas foram: PS/SBRr/SBS 47,5/47,5/5%; PS/SBRr + SBS 47,5/47,5 + 5% e PS/SBS + SBRr 47,5/5 + 47,5% em massa. As blendas foram preparadas por extrusão seguida de injeção e caracterizadas por reometria de torque, tração, impacto, flexão, temperatura de deflexão térmica (HDT), análise térmica dinâmico-mecânica (DMTA), calorimetria exploratória diferencial (DSC), microscopia eletrônica de varredura (MEV) e microscopia eletrônica de transmissão (MET). Observou-se nos resultados dos ensaios mecânicos redução no módulo de elasticidade e na resistência à tração e um aumento significativo na resistência ao impacto quando comparados ao PS para todas as composições. A HDT das misturas reduziu pouco em relação ao PS. A sequência de mistura proporcionou bons resultados das propriedades mecânicas, principalmente na composição PS/SBS + SBRr 47,5/5 + 47,5% em massa. Por MEV e MET, pôde-se observar que as blendas compatibilizadas obtiveram uma melhor distribuição das partículas de borracha com uma morfologia mais estável que as não compatibilizadas. Estes resultados foram confirmados por meio dos maiores valores de resistência ao impacto, o que indica a ação do compatibilizante melhorando a adesão entre os componentes desta blenda. Por DMTA constatou-se que estas blendas são imiscíveis. Portanto, fica evidenciada a importância da reutilização dos resíduos de borracha tanto para a tenacificação do PS como também para a redução dos problemas causados ao meio ambiente, quando estes são descartados de forma indevida. / The aim of this study was to develop blends of polystyrene/compound of rubber waste (PS/SBRr) of the shoes industry aiming to tough the PS and to reuse the SBRr. The blends were prepared in the compositions (70/30; 60/40 and 50/50 wt.%) and with 5 wt.% of styrene-butadiene-styrene compatibilizer (SBS). In order to study the effect of mixing sequence, the 50/50 wt.% composition, which presented the best result in impact strength, was selected. The sequences were PS/SBRr/SBS 47.5/47.5/5%; PS/SBRr + SBS 47.5/47.5 + 5% and PS/SBS + SBRr 47.5/5 + 47.5 wt.%. The blends were prepared by co-rotational twin screw extruder and molded by injection and characterized by torque rheometer, mechanical properties, heat deflection temperature (HDT), dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). From the mechanical tests, a reduction in elastic modulus and tensile strength and a significant increase in impact strength were observed in relation to PS. The HDT for all blends was reduced compared to the PS. The mixing sequence showed good results in mechanical properties, especially in composition PS/SBS + SBRr 47.5/ 5 + 47.5 wt.%. By SEM and TEM it can be seen that the compatibilized blends presented a better distribution of the rubber particles with a morphology that was more stable than the one that was not compatibilized. These results were confirmed by the highest impact strength values, indicating the compatibiliz er action that improves adhesion among the components of the blend. By DMTA it was possible to state that these blends are immiscible. Hence, the importance of the reusing of rubber wastes is evidenced both for toughening of the PS and for the reduction of problems caused to the environment, when they are discharged improperly.

Made available in DSpace on 2014-12-17T14:09:17Z (GMT). No. of bitstreams: 1 MarcilioPR_TESE.pdf: 2753388 bytes, checksum: 58b3cf541e2ed39d0ec5675d37151b31 (MD5) Previous issue date: 2014-02-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Petroleum evaluation is analyze it using different methodologies, following international standards to know their chemical and physicochemical properties, contaminant levels, composition and especially their ability to generate derivatives. Many of these analyzes consuming a lot of time, large amount of samples , supplies and need an organized transportation logistics, schedule and professionals involved. Looking for alternatives that optimize the evaluation and enable the use of new technologies, seven samples of different centrifuged Brazilian oils previously characterized by Petrobras were analyzed by thermogravimetry in 25-900? C range using heating rates of 05, 10 and 20?C per minute. With experimental data obtained, characterizations correlations were performed and provided: generation of true boiling point curves (TBP) simulated; comparing fractions generated with appropriate cut standard in temperature ranges; an approach to obtain Watson characterization factor; and compare micro carbon residue formed. The results showed a good chance of reproducing simulated TBP curve from thermogravimetry taking into account the composition, density and other oil properties. Proposed correlations for experimental characterization factor and carbon residue followed Petrobras characterizations, showing that thermogravimetry can be used as a tool on oil evaluation, because your quick analysis, accuracy, and requires a minimum number of samples and consumables / A avalia??o de petr?leo consiste em analis?-lo por diferentes metodologias, seguindo normas internacionais para conhecer suas propriedades qu?micas, f?sico-qu?micas, teor de contaminantes, composi??o e principalmente sua capacidade em gerar derivados. Muitas dessas an?lises s?o demoradas, consomem uma grande quantidade de amostras, insumos e precisam de uma organizada log?stica de transporte, cronograma de realiza??o e profissionais envolvidos. Para buscar alternativas que otimizem essa avalia??o e permitam a utiliza??o de novas tecnologias, sete amostras de diferentes petr?leos brasileiros centrifugados e caracterizados previamente pela Petrobr?s foram analisadas por termogravim?trica numa faixa de temperatura de 25 a 900?C utilizando raz?es de aquecimento de 05, 10 e 20?C por minuto. Com os dados obtidos experimentalmente, foram realizadas correla??es com as caracteriza??es disponibilizadas que permitiram: a gera??o de curvas de pontos de ebuli??o verdadeiros (Curva PEV) simulada; a compara??o entre as fra??es geradas com as devidas faixas de temperaturas de corte padr?o; uma aproxima??o para obter o fator de caracteriza??o de Watson; e comparar os res?duos de carbono micro. Os resultados mostraram uma boa possibilidade de reproduzir uma curva PEV simulada a partir da termogravimetria levando em considera??o a composi??o, densidade e outras propriedades do petr?leo; as correla??es propostas experimentalmente para o fator de caracteriza??o e res?duo de carbono acompanharam as caracteriza??es informadas pela Petrobr?s, mostrando que a termogravimetria pode ser utilizada como ferramenta na avalia??o de petr?leos, apresentando rapidez na an?lise, precis?o, al?m de necessitar de uma quantidade m?nima de amostras e insumos

Compósitos de fibras naturais com matriz polimérica tem sido foco de estudos por possuírem boas propriedades mecânicas e baixo peso, o que permite sua utilização em diversos meios, incluindo ambientes hospitalares, salas de radioterapia e radiodiagnóstico. Sua grande dificuldade é a falta de afinidade dos materiais componentes, causando distanciamento da interface e baixa transferência de carga entre a matriz e o reforço. Uma alternativa podem ser os compósitos à base de fibras naturais e poliuretana derivada do óleo de mamona. A incidência de radiação pode levar à degradação do material polimérico e à alteração de suas propriedades mecânicas. O objetivo do presente trabalho foi a obtenção e caracterização de compósitos de fibras dispersas e tecido de sisal com matriz poliuretana a base de óleo de mamona, sem adição de agentes de compatibilização, que possam ser utilizados em ambientes que recebam radiação em alta intensidade. Os compósitos foram obtidos por prensagem a frio, irradiados com radiação gama, dose de 25 kGy, e avaliados antes e após irradiação através de ensaios térmicos, de infravermelho, de superfície e mecânicos. Foi observado que pode haver afinidade química entre o material de reforço e a matriz, sendo que não foi evidenciado distanciamento da interface fibra/polímero. Os materiais obtidos podem ser considerados hidrofílicos pela análise de ângulo de contato. Foram obtidos valores máximos de tensão de flexão de 80,33 MPa e módulo elástico em flexão de 4,40 GPa para o compósito de tecido de sisal / poliuretana sem irradiação e resistência ao impacto de 13,14 kJ/m2 para o compósito de fibras dispersas de sisal após irradiação. Pode-se concluir que os materiais são adequados para utilização em salas de radioterapia e radiodiagnóstico. / Natural fiber composites with polymeric matrix has been the focus of studies by having good mechanical properties and low weight, which allows its use in various environments, including hospital, radiotherapy and radiology rooms. Its major difficulty is the lack of affinity of the component materials, causing detachment of the interface and lower load transfer between matrix and reinforcement. An alternative may be composites based on natural fibers and polyurethane derived from castor oil. The incidence of radiation can lead to degradation of polymeric material and change its mechanical properties. The objective of this study was to obtain and characterize composites of dispersed sisal fibers and sisal fabric with polyurethane matrix based on castor oil without addition of compatibilizing agents, which may be used in environments that receive radiation at high intensity. The composites were obtained by cold pressing, irradiated with gamma radiation, dose of 25 kGy, and evaluated before and after irradiation with thermal, infrared, surface and mechanical testing. It was observed that there may be chemical affinity between the reinforcing material and the matrix, since was not observed detachment from the fiber / polymer interface. The materials can be considered hydrophilic by contact angle analysis. Maximum values of bending stress of 80.33 MPa and elastic modulus in bending of 4.40 GPa for the sisal fabric / polyurethane composite without irradiation were obtained, such as impact resistance of 13.14 kJ / m2 for the dispersed sisal fibers composite after irradiation. It can be concluded that the materials are suitable for use in radiotherapy and radiology rooms.

To meet the global hydrocarbon energy demand, it is imperative either to enhance the production from existing fields by applying innovative engineering solutions or discovering new field /resource areas. Both of these options are investigated by petroleum engineers intensively to tackle the challenges of meeting the ever-increasing demand. Meeting the energy demand as, like any other developing country, Jordan is facing a formidable challenge and requires exploration for conventional and unconventional hydrocarbon resources. As Jordan has a long exploration history for conventional reservoirs, Unconventional resource exploration and production seems to be the way to find new energy sources. Different exploration wells were drilled to evaluate the hydrocarbon potential. This research work is focusing on an experimental investigation to evaluate Jordanian hydrocarbon potential as well as to provide recommendations for future exploration activities in shale resources. The Evaluations were performed through comprehensive laboratory experiments that include measurements of Total Organic Content, Grain density, Pore Size Distribution, Specific Surface Area (BET), Mineralogy, Thermogravimetry Analysis, and Rock-Eval pyrolysis. The petrophysical properties (TOC, grain density, pore size distribution) of Jordanian shale (nine different wells) are investigated. The TOC and grain density are in an inversely proportional relationship. The TOC results show a gradual increment with the depth. All the samples have higher porosity dominated by macro pores. Fourteen (14) samples were selected primarily based on TOC (above 1.5%) for further analysis. The specific surface area results show a proportional relationship with the TOC content. Considering the petrophysical properties and mineralogy, these Jordanian shales broadly can be considered as high porosity clay and mudstone type of shale. Thermogravimetry analysis (TG/DTG) results indicate quantitative information related to organic and inorganic matter. Detection of thermos-reactive minerals, especially clay, carbonate, muscovite, pyrite is possible due to the combination of TG/DTG/DSC. The samples are examined under three different procedures which includes different heating programs. The oxidizing and inert atmospheric conditions (procedure i & ii) have the same heating program whereas procedure iii (inert atmospheric condition) has a heating program similar to the Rock-Eval pyrolysis program. The results of these samples show the complex nature of shale as well as organic matter by reacting in different stages (two or, three stages). Depending of the maturity of organic matter, the reaction occurring temperature range varies. Maximum oxidization reaction peaks happen between 479°C to 502°C. The maximum pyrolysis reaction peaks between 498°C to 521°C. Compared with complex heating (procedure iii) and rock Eval pyrolysis, S2 results indicate a high amount of inorganic compounds. Considering TGA reaction peaks and rock Eval pyrolysis results, these Jordanian shales indicate immature with low hydrocarbon generation potential. The Jordanian shale samples are analyzed by using Rock-Eval pyrolysis. Analysis results are used to interpret petroleum potential in rocks. The most important information includes organic matter types (also connected with the depositional settings), organic matter thermal maturity, and the remaining hydrocarbon generation potential in the current form. The organic geochemical analysis results indicate mostly poor to no source rock potential except JF2-760 samples. The hydrogen index (HI) and oxygen index (OI) result suggests that type iii kerogen and type iii/ iv kerogen are most likely from terrestrial and varied settings origin. The low hydrogen, as well as, low S2 value indicate very little hydrocarbon generation potential. Similarly, The Tmax and PI data indicate immature to early mature source rock status and low conversion scenario. Furthermore, the supercritical CO2 is injected into the samples, which is similar to gas flooding experiments to understand the recovery process. Hydrocarbon recovery or, CO2-shale interaction is determined by comparing three different properties (TOC, SSA, and TGA) pre-and-post supercritical CO2 injection. Supercritical CO2 injection in immature shale shows very limited property changes (TOC, SSA, and TGA) to the samples. However, in presence of hydrocarbon the pre-and post-injection property changes TOC, TGA, and SSA (BET) are noticeable enough to conclude HC recovery. Although in the case of immature shale with no hydrocarbon potential the kerogen or bitumen extraction has not been detected, which can be significant in the case of greenhouse gas storage, especially CCUS. This could reduce the risk of Organic Matter (OM) migration possibility in case immature shale formation is present in a suitable geological location.

V poslední době se pozornost polečnosti obrátila k mikroplastům. Jsou produkovány různými odvětvími a šíří se napříč prostředím. Po dlouhou dobu byly považovány za inertní, bez dalšího vlivu na rostliny a jiné živé organismy, avšak jak zjistily nedávné studie, mohly by představovat vážnou hrozbu. Několik vědců, včetně nás, se proto začalo soustředit na jejich transport a transformace v životním prostředí. Většina se však zaměřuje pouze na jejich přítomnost v mořských a sladkých vodách, a proto jejich chování ve vzduchu a půdě zůstává nejasné. Kromě toho byla pozornost soustředěna i na bioplasty. Jsou prezentována jako ekologická alternativa, která má vyřešit všechny dosud zmíněné problémy (a další). Avšak často se zapomíná, že jejich hlavní výhoda může být zároveň nevýhodou. Z tohoto důvodu se tato diplomová práce zaměřuje na negativní účinky spojené s přítomností mikroplastů (konkrétně bioplastu poly-(R)-3-hydroxybutyrátu) v půdě jako jejich běžný receptor. Kombinovali jsme respirometrii, elementární analýzu, termogravimetrii a enzymatické testy, abychom zkoumali fyzikálně-chemické změny v půdě vyvolané přítomností bioplastu. Naše výsledky ukázaly negativní vliv na půdní organickou hmotu a zadržování vody v půdě. V tomto smyslu byl zkoumán i tzv. "priming effect", jelikož docházelo k urychlení a také zpomalení rozkladu půdní organické hmoty. Zaznamenali jsme rozdílný vliv vybraných koncentrací biopolymeru na půdu a také vliv půdních vlastností na průběh degradace. V neposlední řadě zvýšení enzymatické aktivity jasně naznačovalo vliv přítomnosti biopolymeru na mikrobiální komunitu. Na základě takových zjištění jsme došli k závěru, že přidání biopolymeru vede k dlouhodobému dopadu na řadu funkcí půdního ekosystému.

Self-emulsifying systems are mixtures of oils and surfactants, ideally isotropic, sometimes including cosolvents, which emulsify under conditions of gentle agitation, similar to those which would be encountered in the gastrointestinal tract. The process of self-emulsification has remained the center of attraction for most researchers. Controlled hydration of self-emulsifying systems shows formation of an intermediate gel phase which upon rupture forms an emulsion. Current work was undertaken to understand and explore the microstructural properties of intermediate gel phase which are believed to influence the performance (droplet size) of the final formulation. The effect of additives on microstructural properties of intermediate gel phase has also been investigated. Microstructural elucidation of hydrated samples of intermediate regimes was done by using techniques such as small angle X-ray scattering, differential scanning calorimetry and rheology. Samples from intermediate regimes showed formation of local lamellar structure which swelled with hydration. In the present work, the effect of addition of salt form of naproxen (sodium and potassium) and naproxen (base) on microstructural properties of intermediate regimes was investigated. Systems containing naproxen salts formed larger droplets whereas naproxen base formed smaller ones. Microstructural properties of intermediate lamellar structures were well correlated with performance of the final formulation. The current studies indicate that by controlling the properties of intermediate regimes optimized formulations with desired performance can be tailor-made.

No / A systematic identification of the degradation products of hydroxypropyl methylcellulose phthalate (HPMCP) during hot melt extrusion (HME) has been performed. A reverse phase HPLC method was developed for the extrudates of both hydroxypropyl methylcellulose acetate succinate (HPMCAS) and HPMCP polymers to quantify their thermal hydrolytic products: acetic acid (AA), succinic acid (SA) for HPMCAS and phthalic acid (PA) for HPMCP, without hydrolysing the polymers in strong alkaline solutions. The polymers were extruded in the temperature range of 160-190 degrees C at different screw rotation speeds and hydrolytic impurities were analysed. Investigation of extruded HPMCP showed an additional thermal degradation product, who is structural elucidation revealed to be phthalic anhydride (PAH). Moreover, two environmental analytical impurities, dimethyl phthalate and methyl benzoate formed in situ were recorded on GC-MS and their origin was found to be associated with PAH derivatization. Using the experimental data gathered during this study, a degradation mechanism for HPMCP is proposed.