ESPERIDIANA AUGUSTA BARRETOS DE MOURA

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 CurrĆ­culo Lattes on October 8th 2021)


Possui graduaĆ§Ć£o em Engenharia QuĆ­mica pela Faculdade Oswaldo Cruz (1983), mestrado em Tecnologia Nuclear ? AplicaƧƵes pelo IPEN/USP (1999), doutorado em Tecnologia Nuclear ? AplicaƧƵes pelo IPEN/USP (2006) e PĆ³s-Doutorado no Center for Advanced Materials (T-CAM) da Tuskegee University, AL, USA. As principais linhas de pesquisa sĆ£o: SĆ­ntese de nanopartĆ­culas metĆ”licas; ObtenĆ§Ć£o e caracterizaĆ§Ć£o de nanopartĆ­culas a partir de resĆ­duos da atividade mineral e da agroindĆŗstria; FuncionalizaĆ§Ć£o de micro e nanocargas; SĆ­ntese e reduĆ§Ć£o de Ć³xido de grafeno; Desenvolvimento e modificaƧao de materiais compĆ³sitos baseados em polĆ­meros convencionais e biodegradĆ”veis com fibras vegetais, micro e nanocargas de origem renovĆ”vel; Desenvolvimento de embalagens plĆ”sticas biodegradĆ”veis, ativas e inteligentes para alimentos, cosmĆ©ticos, produtos mĆ©dicos e farmacĆŖuticos;Desenvolvimento de materiais polimĆ©ricos condutores; Desenvolvimento de biomateriais para aplicaĆ§Ć£o na regeneraĆ§Ć£o de tecidos Ć³sseos e dentĆ”rios. (Texto extraĆ­do do CurrĆ­culo Lattes em 08 out. 2021)

Projetos de Pesquisa
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  • Artigo IPEN-doc 29057
    Enhanced miscibility of PBAT/PLA/lignin upon Ī³-irradiation and effects on the non-isothermal crystallization
    2022 - BARROS, JANETTY J.P.; SOARES, CARLOS P.; MOURA, ESPERIDIANA A.B. de; WELLEN, RENATE M.R.
    Lignin is natural and renewable polymer, the second most abundant on Earth. Properly used it can reduce synthetic and oil based materials in addition to contributing to the biodegradable systems. In this work, the kraft lignin was subjected to gamma radiation at absorbed doses of 30, 60, and 90ā€‰KGy in order to increase the interaction with ā€œPoly(butylene adipate-co-terephthalate) (PBAT)/Poly(lactic acid) (PLA)ā€ blend (EcovioĀ®). PBAT/PLA/lignin blends with 10% of the weight of lignin were produced by extrusion using twin-screw extruder and characterized by Fourier transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC), and Field emission scanning electron microscopy (FE-SEM). FTIR spectra showed partial miscibility between PBAT/PLA and lignin, most due to the hydrogen bond between PBAT/PLA carbonyl and lignin hydroxyl, being intensified in irradiated lignin compounds. As evidenced on DSC scans, in PBAT/PLA/irradiated lignin the crystallization peak was shifted to lower temperatures and the crystallization rate decreased. Crystallization kinetics was modeled using Pseudo Avrami, and isoconversional models of Friedman and Vyazovkin. Pseudo-Avrami displayed linearity deviation at beginning and crystallization ending due to the nucleation and secondary crystallization, while from Friedman and Vyazovkin the activation energy (Ea) was higher for PBAT/PLA/irradiated lignin 30ā€‰KGy, characterizing crystallization with higher energy consumption. FE-SEM images showed better dispersion and miscibility in PBAT/PLA/irradiated lignin. The results indicate that the irradiation of Kraft lignin promotes miscibility and compatibility of PBAT/PLA/lignin.
  • Artigo IPEN-doc 27392
    Mechanical and thermal properties of modified Georgian and Brazilian clay infused biobased epoxy nanocomposites
    2021 - KODALI, DEEPA; UDDIN, MD-JAMAL; MOURA, ESPERIDIANA A.B.; RANGARI, VIJAK K.
    This study focuses on the preparation and characterization of nanocomposite system with bio-based epoxy resin (Super SAP 100/1000, contains 37% bio-based carbon content) and natural clays including Georgian clay and Brazilian clay. Georgian clay was surface modified using an ultrasound processing in presence of Decalin. Brazilian clay was modified to organophilic bentonite using quaternary ammonium salts. The resulting nano clay particles were characterized using XRD and TEM to confirm the particle size reduction and uniform distribution. The as-fabricated nanocomposites were characterized using flexure, DMA, TMA and TGA. The flexure analysis showed that the modified clay composites have significant improvement in strength (23ā€“38%) and modulus (28ā€“37%). Delayed thermal degradation was observed from TGA analysis which showed that the major degradation temperatures improved from 7Ā°-25Ā°C. DMA and TMA analysis showed improvements in storage moduli (4ā€“6%) and coefficient of thermal expansion (CTE) (6ā€“64%), respectively. The notable improvement in thermal and mechanical properties suggested the effective dispersion and the high degree of polymer particle interaction. The bio based content present in the Super Sap 100/1000 acts as plasticizer resulting in the extensive ductility of the polymer.