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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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.
Effects of bio-CaCO3 nanoparticles and graphene nanosheets on properties of PBAT/PLA flexible films treated by ionizing radiation
2016 - REIS, PEDRO R.S.; CARDOSO, ELIZABETH C.L.; LOURENÇO, FELIPE R.; ORTIZ, ANGEL V.; RANGARI, VIJAY K.; MOURA, ESPERIDIANA A.B.
Mechanical, thermal and barrier properties of EVOH/GRAPHENE oxide flexible films treated by electron beam radiation
2016 - SANTANA, JULYANA G.; ORTIZ, ANGEL; AKBULUT, MESHUDE; RANGARI, VIJAY K.; VALENZUELA-DIAZ, FRANCISCO; GUVEN, OLGUN; MOURA, ESPERIDIANA A.B.
Ethylene vinyl alcohol (EVOH) copolymers are semicrystalline random copolymers of ethylene and vinyl alcohol that are widely used in the food packaging industry owing to their excellent chemical resistance, high transparency as well as excellent gas barrier properties to oxygen, organic solvents, and food aromas. However, EVOH is very sensitive to moisture and its gas barrier ability deteriorates in high relative humidity conditions. This study presents the preparation of EVOH/Graphene oxide films by twin-screw extrusion and blown film extrusion processing. The preparation of EVOH/Graphene oxide (EVOH/GO) films was carried out in two steps: EVOH with Graphene oxide powder (0-0.5 wt. %) was fed into a co-rotating twin-screw extruder, then the EVOH/GO nanocomposite was transformed into thin films using an extrusion blown film, single screw machine with 25 mm diameter and specimens test samples were obtained. Part of EVOH/GO flexible films were submitted to electron-beam irradiation at 150 and 200 kGy, using a 1.5 MeV electron beam accelerator, at room temperature in presence of air. The irradiated and non-irradiated samples were characterized by mechanical tests, XRD, TG, DSC, FE-SEM and TEM analysis and the correlation between properties was discussed. In addition, the oxygen permeability tests were performed at 23 C, 0 % and 90 % relative humidity using an OX-TRAN (MOCON Inc.). The free volume hole radius of both crystalline (0.201 nm) and amorphous parts (0.258 nm) of EVOH only and EVOH-GO samples were measured by Positron Annihilation Life-Time Spectroscopy. According to the results of the optical transparency measured, the EVOH/GO retaining good transparency films for all graphene oxide percentage added. The EVOH matrix with 0.1-0.4 wt. % graphene oxide content presented better oxygen barrier properties at 0 % relative humidity when compared with neat EVOH flexible films. After irradiation treatment, both, mechanical and oxygen barrier properties were drastically improved. Upon introduction of GO into EVOH matrix a reduction in the free volume hole radius in both parts have been observed indicating the formation of a more compact structure in EVOH/GO nanocomposites. Formation of hydrogen bonding between OH groups of EVOH and polar groups on graphene is assumed to be responsible for the reduction in free volume.
Morphology, optical transparency and oxygen barrier of EVOH/graphene oxide films
2016 - ORTIZ, ANGEL; AKBULUT, MESHUDE; SANTANA, JULYANA G.; RANGARI, VIJAY K.; VALENZUELA-DIAZ, FRANCISCO; GUVEN, OLGUN; MOURA, ESPERIDIANA
Food packaging materials require high gas and moisture barrier in other to preserve the quality of the products during storage and handling. Polyolefin materials have been widely used due to their water vapor resistance. Ethylene–vinyl alcohol copolymer (EVOH) is used as a gas barrier layer in packaging products that require high gas barrier. However, EVOH is very sensitive to moisture and its gas barrier ability deteriorates in high relative humidity conditions. In order to overcome the adverse effects of moisture on EVOH film this paper studies the incorporation of small amount of graphene oxide in EVOH by melt processing and evaluates their effects on morphology, optical transparency and oxygen barrier of EVOH film. The EVOH/Graphene oxide (EVOH/GO) film were processed by twin-screw extrusion and extrusion blown film processing. The films was characterized by XRD, FEG-SEM, and UV/VIS analysis. In addition, the oxygen transmission rate (OTR) were performed at 23 C, 0 % and 90 % relative humidity using an OX-TRAN (MOCON Inc.). According to the results of the optical transparency measured, the EVOH/GO retaining good transparency films for all graphene oxide percentage added. The graphene oxide at only 0.1 wt. % into the EVOH matrix drastically improved the oxygen barrier properties of EVOH/GO flexible film in both, 0 % and 90 % of the relative humidity test conditions.
Electron beam irradiation effects on the resistance of packaging materials in the perforation by Lasioderma serricorne
2008 - ALVES, J.N.; ARTHUR, V.; MOURA, E.A.B.; OLIVEIRA, V.M.; ORTIZ, A.V.; POTENZA, M.R.
Effects of electron-beam irradiation on mechanical and barrier properties of commercial high oxygen barrier coextruted flexible food packaging material
2008 - PAULA, A.B.A.; ARAUJO, F.L.; ORTIZ, A.V.; MOURA, E.A.B.
Estudo comparativo do efeito da radiacao ionizante sobre as propriedades opticas do filme flexivel de poliamida 6, 6.6
2005 - PAULA, A.B.A.; MOURA, E.A.B.; ORTIZ, A.V.; WIEBECK, H.; ANDRADE e SILVA, L.G.
Biodegradable aliphatic aromatic copolyester/corn starch blend composite reinforced with cofee parchment hush
2013 - SILVA, VALQUIRIA A.; TEIXEIRA, JACIELE G.; GOMES, MICHELLE G.; ORTIZ, ANGEL V.; OLIVEIRA, RENE R.; SCAPIN, MARCOS A.; COLOMBO, MARIA A.; MOURA, ESPERIDIANA A.B.
Sugarcane bagasse ash reinforced HDPE composites: effects of electron-beam radiation crosslinking on tensile and porphological properties
2013 - TEIXEIRA, JACIELE G.; GOMES, MICHELLE G.; OLIVEIRA, RENE R.; SILVA, VALQUIRIA A.; SARTORI, MARIANA M.; ORTIZ, ANGEL V.; MOURA, ESPERIDIANA A.B.
Estudo dos efeitos da radiacao por feixe de eletrons nas propriedades mecanicas da estrutura BOPP/LDPE
2009 - NOGUEIRA, BEATRIZ R.; OLIVEIRA, VITOR M.; ORTIZ, ANGEL V.; MOURA, ESPERIDIANA A.B.