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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IPEN e a nanotecnologia
2020 - LINARDI, MARCELO; LUGAO, ADEMAR B.; OLIVEIRA NETO, ALMIR; NETTO, ANA P.F.A.; FREITAS, ANDERSON Z. de; CARBONARI, ARTUR W.; RODRIGUES, CLAUDIO; VIEIRA, DANIEL P.; ANDRADE, DELVONEI A. de; ZEZELL, DENISE M.; PARRA, DUCLERC F.; FONSECA, EDVALDO R.P. da; GALEGO, EGUIBERTO; MUCCILLO, ELIANA N. dos S.; SANTIAGO, ELISABETE I.; CARVALHO, ELITA F.U. de; BERNARDES, EMERSON S.; MOURA, ESPERIDIANA A.B. de; SPINACE, ESTEVAM V.; FONSECA, FABIO C.; SILVA, FLAVIA R. de O.; COSENTINO, IVANA C.; MENGATTI, JAIR; PERROTTA, JOSE A.; BRESSIANI, JOSE C.; ROGERO, JOSE R.; RAMANATHAN, LALGUDI V.; ROCHA, MARCELO da S.; PIRES, MARIA A.F.; ROSTELATO, MARIA E.C.M.; RIBEIRO, MARTHA S.; COTRIM, MARYCEL E.B.; IGAMI, MERY P.Z.; WETTER, NIKLAUS U.; VIEIRA JUNIOR, NILSON D.; RODRIGUES JUNIOR, ORLANDO; FARIA JUNIOR, RUBENS N. de; SAKATA, SOLANGE K.; BALDOCHI, SONIA L.; LOPES, THIAGO; ROSSI, WAGNER de; CALVO, WILSON A.P.
Effects of electron beam radiation doses on the foam formation in pre-ceramic polymer
2008 - ROCHA, R.M.; MOURA, E.A.B.; BRESSIANI, J.C.; BRESSIANI, A.H.A.
Aplicacao de radiacao ionizante em misturas de polissiloxano-carga ativa para obtencao de compositos ceramicos
2002 - ROCHA, R.M.; MOURA, E.A.B.; MORI, M.N.; BRESSIANI, J.C.; BRESSIANI, A.H.A.
Espumas ceramicas obtidas a partir da pirolise de polissiloxano e carga ativa de Al e Si
2003 - ROCHA, R.M.; MOURA, E.A.B.; BRESSIANI, J.C.; BRESSIANI, A.H.A.
Obtenção de espumas cerâmicas no sistema Si-Al-O-C-N a partir de polissiloxano irradiado com feixe de elétrons
2002 - ROCHA, R.M.; MOURA, E.A.B.; MORI, M.N.; BRESSIANI, J.C.; BRESSIANI, A.H.A.
Neste trabalho é apresentado um novo método de obtenção de espumas cerâmicas no sistema Si-Ak 0-C-N a pa rt ir da pirólise de precursores poliméricos, polimetilssiloxano- PMS, e PMS (70 % em vol) com carga ativa de alumínio e silício. Amostras compactadas destes materiais são irradiadas com feixe de elétrons à dose de 7MGy. Durante a irradiação ocorrem os processos de reticulação e degradação liberando produtos voláteis gerando porosidade. Esta espuma é então submetida a pirólise a 1500 °C por 2 horas em atmosfera de argônio ou nitrogênio, resultando em espumas cerâmicas com fase amo rfa, para as amostras contendo somente o polissiloxano e fases cristalinas covalentes para as amostras contendo polissiloxano mais carga ativa. A mo rfologia das espumas foi mantida após a pirólise, apresentando estruturas de células abe rtas bem definidas, com densidade volumétrica de aproximadamente 0,5 g/cn1 e tamanho de célula variável (30 a 300 um).
SiOC ceramic foams synthesized from electron beam irradiated methylsilicone resin
2008 - ROCHA, R.M.; MOURA, E.A.B.; BRESSIANI, A.H.A.; BRESSIANI, J.C.
A new method to prepare silicon oxycarbide (SiOC) foams has been developed and it consists of electron beam irradiation of a methylsilicone preceramic polymer followed by pyrolysis in an inert atmosphere. Methylsilicone resin foams were prepared by simultaneous curing and foaming, without the addition of calalysts or blowing agents. The polymer precursor was irradiated with 1.5 MeV EB up to a dose of 7.0 MGy and at a dose rate of 2.8 kG/s, in air. During irradiation the polymer melted, due to rapid increase in temperature, and simultaneously crosslinked by interaction with the ionizing radiation. Crosslinking occurred mainly by poly-condensation reactions and gaseous condensation products were released. The latter acted as an intrinsic foaming agent in the molten polymer. Foams obtained with radiation doses higher than 3.5 MGy showed a high degree of crosslinking with a ceramic yield of over 89% at 1,000 °C. Pyrolysis at 1,200-1,500 °C resulted in SiOC ceramic foams with dense struts and walls, with bulk density around 0.3 g/cm3 and total porosity of 84%. Foams pyrolyzed at 1,200 °C revealed compression strength of 6.8 MPa.
Effect of electron beam radiation dose on the foam formation in pre-ceramic polymer
2010 - ROCHA, ROSA M. da; MOURA, ESPERIDIANA A.B.; BRESSIANI, JOSE C.; BRESSIANI, ANA H.A.
Methylsilicone resin as a polymer precursor for a SiOC ceramic material was cured and foamed by electron beam (EB) irradiation in air prior to the pyrolysis under an inert atmosphere. Methylsilicone foams were obtained without additional foaming agent when exposed to accelerated electrons with radiation doses up to 9MGy and dose rate of 2.8kGy/s. During irradiation the polymer was melted and simultaneously gaseous products were formed by the methyl group oxidation and by the polycondensation crosslinking reactions. The formed gases could not escape from the molten polymer and began to aggregate into bubbles. The effect of the radiation dose on the polymer foam molecular structure, the gel fraction and the ceramic yield was analyzed. The results indicate that the maximum amount of crosslinking in methylsilicone, when EB radiation is used, occurred between 1.0 and 2.0MGy radiation dose. Methylsilicone foams were pyrolysed in N2 atmosphere at temperatures of 1200 and 1500 1C, resulting in amorphous SiOC and partially crystalline ceramic foams, respectively. A porosity of 84% was achieved in the pyrolyzed foams, with cell size ranging from 30 to 300mm and density of about 0.31gcm3.