ESPERIDIANA AUGUSTA BARRETOS DE MOURA

ESPERIDIANA AUGUSTA BARRETOS DE MOURA

(Fonte: Lattes)

Resumo

Graduated in Chemical Engineering at Faculdade Oswaldo Cruz (1983), Master in Nuclear Technology - Applications at IPEN / USP (1999), Ph.D. in Nuclear Technology - Applications at IPEN / USP (2006) and Post-Doctorate at Center for Advanced Materials ( T-CAM) from Tuskegee University, AL, USA. The main lines of research are: Synthesis of metallic nanoparticles; Obtaining and characterization of nanoparticles from mineral activity and agroindustry residues; Micro and nanofiller functionalization; Synthesis and reduction of graphene oxide; Development and modification of composite materials based on conventional and biodegradable polymers with vegetable fibers, micro and nanofillers of renewable origin; Development of biodegradable, active and intelligent plastic packaging for food, cosmetics, medical and pharmaceutical products; Development of conductive polymeric materials; Development of biomaterials for application in the regeneration of bone and dental tissue. (Text obtained from the Currículo Lattes on October 8th 2021)

Possui graduação em Engenharia Química pela Faculdade Oswaldo Cruz (1983), mestrado em Tecnologia Nuclear ? Aplicações pelo IPEN/USP (1999), doutorado em Tecnologia Nuclear ? Aplicações pelo IPEN/USP (2006) e Pós-Doutorado no Center for Advanced Materials (T-CAM) da Tuskegee University, AL, USA. As principais linhas de pesquisa são: Síntese de nanopartículas metálicas; Obtenção e caracterização de nanopartículas a partir de resíduos da atividade mineral e da agroindústria; Funcionalização de micro e nanocargas; Síntese e redução de óxido de grafeno; Desenvolvimento e modificaçao de materiais compósitos baseados em polímeros convencionais e biodegradáveis com fibras vegetais, micro e nanocargas de origem renovável; Desenvolvimento de embalagens plásticas biodegradáveis, ativas e inteligentes para alimentos, cosméticos, produtos médicos e farmacêuticos;Desenvolvimento de materiais poliméricos condutores; Desenvolvimento de biomateriais para aplicação na regeneração de tecidos ósseos e dentários. (Texto extraído do Currículo Lattes em 08 out. 2021)

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Environmental problems in the production of gypsum encourage its recycling and reuse for the production of new composites
2018 - BARTOLOMEI, S.S.; ESPER, F.J.; MOURA, E.A.; WIEBECK, H.
In Brazil, plaster recycling has been growing since the change in resolution 307 of the National Council of the Environment (Conama), which since 2011 classifies plaster as a recyclable product. Thus, the industries generating this type of waste are responsible for properly targeting them. The main ways to recycle plaster are: reuse for soil repair in the agricultural industry and calcination, therefor, the waste can be reused again in the civil industry. This work studied the temperature for calcination and the contamination of the residues of the production of plaster angles, to verify the feasibility of recycling with a lower possible energy consumption and, also for the use of these particles as dispersed phase in new composites. For this, XRD, FTIR tests were carried out and the grain size obtained after the plaster recycling was determined.
Caracterização de nanotubos de haloisita funcionalizados covalentemente para aplicação em compósitos de matriz polimérica
2018 - FRANCISCO, D.L.; SILVA, F.A.; PAIVA, L.B.; ALDEIA, W.; LUGAO, A.B.; MOURA, E.
A haloisita (HNT) possui interessantes características suscitando seu interesse como candidata à produção de nanocompósitos poliméricos de alto desempenho. O teor relativamente baixo de grupos hidroxílicos em sua superfície a torna relativamente hidrofóbica, embora, às vezes, isso não seja suficiente para garantir uma boa adesão interfacial com a matriz polimérica. Sendo então, necessário um tratamento hidrofóbico adicional para favorecer a compatibilidade com a matriz. No presente estudo, um tratamento hidrofóbico da HNT foi avaliado a partir de soluções hidrolisadas de 3-(trimetoxisilil)propil metacrilato (MAPTS) em meio alcoólico. A HNT modificada foi caracterizada através da análise de área superficial específica, análise termogravimétrica e ensaio de extração em solução de água/tolueno. Os resultados mostraram uma redução na área superficial, um aumento na perda de massa final no ensaio termográvimetrico e um deslocamento da HNT modificada para o tolueno, evidenciando a funcionalização da HNT com o MAPTS.
Propriedades térmicas e mecânicas de filmes flexíveis de polietileno e copolímero de etileno e álcool vinílico reforçados com óxido de grafeno
2017 - SANTANA, JULYANA G.; GUVEN, OLGUN; MOURA, ESPERIDIANA A.B.
Os copolímeros de etileno e álcool vinílico (EVOH) são uma família de resinas com excelentes propriedades de barreira a gás de grande importância para a indústria de embalagens para alimentos, o polietileno de alta densidade (HDPE) um polímero hidrofóbico que em mistura com o EVOH, agrega melhores propriedades de barreira e mecânicas a embalagem final. O objetivo deste trabalho foi estudar os efeitos da adição de óxido de grafeno (GO) nas propriedades de filmes flexíveis preparados a partir de uma blenda HDPE e EVOH (HDPE/EVOH). Que foram processados, utilizando-se uma extrusora dupla rosca corrotante, e posteriormente os materiais processados foram alimentados a uma extrusora balão de laboratório para a obtenção dos filmes flexíveis. Os filmes flexíveis foram caracterizados por meio das análises de DSC, TG, MEV e ensaios de tração e a correlação entre as suas propriedades foi discutida.
Processamento e caracterização de EVA com adição de celulose
2017 - SEIXAS, MARCUS V. de S.; MOURA, ESPERIDIANA A.B.; WIEBECK, HELIO
O copolímero poli[(etileno)-co-(acetato de vinila)] (EVA) é utilizado principalmente com o objetivo de melhorar a resistência mecânica, a processabilidade, a resistência ao impacto e as propriedades de isolamento e transparência, sobretudo em embalagens coextrusadas para produtos alimentícios, filmes térmicos, embalagens para produtos refrigerados e congelados. O EVA reforçado com 1 % de celulose foi processado por extrusão, utilizando-se uma extrusora dupla-rosca. As amostras de EVA e do compósito EVA/Celulose foram caracterizadas por meio das análises de DSC, TG, MEV e ensaios de resistência à tração. Os resultados mostraram alterações significativas nas propriedades mecânicas e térmicas do EVA reforçado com celulose, quando comparadas às propriedades do EVA puro.
Effect of electron-beam irradiation on Nylon-6/diamond coated CNTS composite fiber
2013 - IMAM, MUHAMMAD A.; GOMES, M.G.; MOURA, ESPERIDIANA A.B.; JEELANI, SHAIK; RANGARI, VIJAY K.
Polyamides (Nylon-6) are engineering plastic with excellent properties which are useful in several industrial applications and are valued for their high strength and processability. The addition of filler such as diamond coated Carbon Nano Tubes (CNTs) to form molded composites has increased the range of polyamide applications due to the resulting increase in strength. The effects of electron-beam irradiation on these thermoplastic nanocomposites are either increases the cross-linking or causes chain scission. In this study, DN-coated CNTs were synthesized using sonochemical technique in the presence of cationic surfactant CTAB. These hybrid nanoparticles were characterized using TEM analysis. The nanoparticles were then introduced into Nylon-6 polymer through a melt extrusion process to form nanocomposite fibers that were tested for their mechanical & thermal properties (e.g. tensile and Differential Scanning Calorimetry). These composites were further exposed to the electron-beam (160 KGy, 132 KGy and 99 KGy) using a 1.5 MeV electron beam accelerator, at room temperature, in presence of air and tested for their thermal and mechanical properties. The ultimate tensile strength were found to be 521 MPa, 690 MPa and 425 MPa for radiated (99 KGy,132 KGy and 160 KGy) DN/CNTs/Nylon-6 single fibers as compared to 346 MPa for DN/CNTs/Nylon-6 single fibers without irradiation and 240 MPa for neat Nylon-6 single fibers respectively. Differential Scanning Calorimetry (DSC) analysis results were showed that degree of cure was increased because of cross-linking which was expected at high electron-beam radiation dose.
Preparation and characterization of PBT/clay nanocomposite
2012 - SARTORI, MARIANA N.; OLIVEIRA, RENE R.; DIAZ, FRANCISCO R.V.; ORTIZ, ANGEL V.; RANGARI, VIJAYA K.; MOURA, ESPERIDIANA A.B.
This work presents the preparation and characterization of a nanocomposite based on Poly(butylene terephthalate) PBT and Brazilian smectitic clay (bentonite chocolate clay). Before being incorporated as clay nanoparticles in PBT resin, the clay was organically modified by the addition of a quaternary salt and sodium carbonate. PBT/Clay nanocomposite (96.3:3.70 wt %) was obtained by using a twin-screw extruder machine. After extrusion process, the nanocomposite was characterized by tensile, flexural and impact tests, SEM, Vicat, HDT, DSC, TGA and XRD tests. The results showed that the properties of the nanocomposite obtained were superior to those of neat PBT. Concerning the temperature of thermal distortion (HDT) an expressive gain of around 45 % was presented to PBT/Clay nanocomposite compared to PBT evidencing the interaction of nanofiller with the polymeric matrix.
Comparison between HDPE/clay and HDPE/piassava fiber/clay treated by electron beam radiation
2013 - ORTIZ, ANGEL; ESCANHOELA, CORDELIA M.F.; GOMES, MICHELLE; OLIVEIRA, RENE R.; DIAZ, FRANCISCO R.V.; MOURA, ESPERIDIANA A.B.
This work evaluates changes in morphological, mechanical and thermo-mechanical properties of electron-beam irradiated HDPE/nanoclay and HDPE/Piassava fiber/nanoclay. Material samples irradiated with 100 and 200 kGy using a 1.5 MeV electron beam accelerator (room temperature, presence of air) were submitted to tensile, flexural, and HDT tests. MFI, SEM and XRD analyses were carried out. Correlation between properties was discussed. Results showed that incorporation of piassava (Attalea funifera Mart) fiber and nanoclay, followed by irradiation represented significant gain in thermo-mechanical properties. Changes in surface morphology and reduction in MFI were observed. In conclusion, it may be claimed that the incorporation of piassava fiber in small size particles and nanoclay in the HDPE followed by electron-beam irradiation effectively improved the polymer properties and led to materials with superior properties suitable for several industrial applications.
Comparative study of the sugarcane bagasse FIBER/HDPE composite properties using electron-beam and gamma radiation treatments
2012 - PEREIRA, AMANDA C.S.; CHINELLATO, ANNE C.; SORIA, ALEJANDRA T.; ABREU, ANIBAL V.; DEL MASTRO, NELIDA L.; MOURA, ESPERIDIANA A.B.
This work presents a comparative study of the thermo-mechanical and morphological properties of sugarcane bagasse fiber/HDPE composite treated with electron-beam and gamma radiation. The composite samples obtained by extrusion and injection molding processes were irradiated at 50 and 90 kGy using either a 1.5 MeV electron beam accelerator or gamma irradiator EMI-9, at room temperature in presence of air. The irradiated and non-irradiated samples were submitted to mechanical and MFI tests, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), sol-gel analysis and X-Rays Diffraction (XRD) and the correlation between their properties was discussed. Improvement of the bagasse fiber/HDPE composite properties, using electron-beam or gamma radiation, was found.
Thermal and morphological behavior of EVOH/piassava fiber composites
2012 - NOGUEIRA, BEATRIZ R.; CHINELLATO, ANNE; ORTIZ, ANGEL V.; PARVEEN, ARIFA; RANGARI, VIJAYA K.; MOURA, ESPERIDIANA A.B.
Composite consisting of ethylene vinyl alcohol (EVOH) with short piassava fibers were prepared by extrusion process and their thermal and morphological behavior were investigated. The EVOH reinforced with 5 and 10 % of piassava {Attaleafimifera Mart) fiber particle, based on the percentage weight ratio (wt %), untreated and treated with a commercial silane coupling agent, were prepared and the influence of fiber loading and the effect of chemical treatment on their thermal and morphological behavior were evaluated by SEM, DSC and TG analyses. Melt flow index (MFI) of the composites have been determined to evaluate the effects of fiber reinforcement on dynamic viscoelastic melt of the EVOH. In addition, piassava fibers characterization by SEM, FTIR, and organic and inorganic composition have also been carried out. The SEM results of the composites showed surface micrographs without microvoids and a good distribution, dispersion and compatibility between the fillers and the EVOH matrix. Concerning the piassava fibers characterization, the results showed that piassava has higher lignin content than cellulose and hemicelluloses, and around 0.7 % of ash with 52 % of silica (Si02). This high concentration of silica is consistent with the SEM analysis of the fiber that showed a large amount of "silica rings" encrusted on their surface.
Effects of carbon black incorporation on morphological, mechanical and thermal properties of biodegradable films
2016 - HARADA, JULIO; MACEDO, JOSE R.N.; MACHADO, GLAUSON A.F.; VALENZUELA-DIAZ, FRANCISCO; MOURA, ESPERIDIANA A.B.; ROSA, DERVAL S.
This work evaluates the effects of carbon black incorporation on morphological, mechanical and thermal properties of biodegradable films. The biodegradable composite films based on PBAT/PLA blend and PBAT/PLA blend containing 2 wt. % of carbon black were prepared by me lt extrusion, using a twin screw extruder machine and blown extrusion process. The properties of biodegradable film samples were investigated by tensile tests, XRD, MFI, TGA, DSC and FE-SEM analysis and the correlation between properties was discussed.