RAFAEL HENRIQUE LAZZARI GARCIA

Resumo

Ao se formar no Colégio Bandeirantes, em 1998, realizou parte do curso de graduação em Ciências Sociais pela USP (2000 e 2001) e graduou-se em Ciências Com Habilitação Em Química nas Faculdades Oswaldo Cruz (2000 a 2003). Desempenhou parte da iniciação científica no IPEN em 2001, na área de Química Ambiental, e foi bolsista no agrupamento de processos químicos do IPT, de 2001 a 2004, aonde trabalhou com cristalização e caracterização de matérias primas industriais. Obteve o grau de Mestre, em 2007, no Instituto de Pesquisas Energéticas e Nucleares, na Universidade de São Paulo, estudando cerâmicas para células a combustível SOFC, e o grau de Doutor, em 2019, na área de caracterização de combustíveis nucleares. Em 2007, realizou visitas técnicas a centros de pesquisas no Japão, como parte do programa de Intercâmbio de Grupos de Estudo, patrocinado pela Fundação Rotária. De 2008 a 2010 foi professor voluntário no curso de alfabetização de adultos promovido pelo Rotary Liberdade. Atualmente é pesquisador do Instituto de Pesquisas Energéticas e Nucleares, no Centro de Combustíveis Nucleares, responsável pelos laboratórios de fluorescência e difração de raios X, e estuda combustíveis para reatores do tipo MTR. (Texto extraído do Currículo Lattes em 4 maio 2023)

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  • Artigo IPEN-doc 24329
    Comparison of gamma radiation effects on natural corn and potato starches and modified cassava starch
    2018 - TEIXEIRA, BRUNA S.; GARCIA, RAFAEL H.L.; TAKINAMI, PATRICIA Y.I.; DEL MASTRO, NELIDA L.
    The objective of this work was to evaluate the effect of irradiation treatment on physicochemical properties of three natural polymers, i.e. native potato and corn starches and a typical Brazilian product, cassava starch modified through fermentation-sour cassava- and also to prepare composite hydrocolloid films based on them. Starches were irradiated in a Co-60 irradiation chamber in doses up to 15 kGy, dose rate about 1 kGy/h. Differences were found in granule size distribution upon irradiation, mainly for corn and cassava starch but radiation did not cause significant changes in granule morphology. The viscosity of the potato, corn and cassava starches hydrogels decreased as a function of absorbed dose. Comparing non-irradiated and irradiated starches, changes in the Fourier transform infrared (FTIR) spectra in the 2000-1500 cm(-1) region for potato and corn starches were observed but not for the cassava starch. Maximum rupture force of the starch-based films was affected differently for each starch type; color analysis showed that doses of 15 kGy promoted a slight rise in the parameter b* (yellow color) while the parameter L* (lightness) was not significantly affected; X-ray diffraction patterns remained almost unchanged by irradiation.
  • Artigo IPEN-doc 22445
    Study of free radicals in gamma irradiated cellulose of cultural heritage materials using Electron Paramagnetic Resonance
    2016 - KODAMA, YASKO; RODRIGUES JUNIOR, ORLANDO; GARCIA, RAFAEL H.L.; SANTOS, PAULO de S.; VASQUEZ, PABLO A.S.
    Main subject of this article was to study room temperature stable radicals in Co-60 gamma irradiated contemporary paper using Electron Paramagnetic Resonance spectrometer (EPR). XRD was used to study the effect of ionizing radiation on the morphology of book paper. SEM images presented regions with cellulose fibers and regions with particles agglomeration on the cellulose fibers. Those agglomerations were rich in calcium, observed by EDS. XRD analysis confirmed presence of calcium carbonate diffraction peaks. The main objective of this study was to propose a method using conventional kinetics chemical reactions for the observed radical formed by ionizing radiation. Therefore, further analyses were made to study the half-life and the kinetics of the free radical created. This method can be suitably applied to study radicals on cultural heritage objects.