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Minicurso sobre História da Ciência, Meio Ambiente e Energia é ministrado a professores de Escola Estadual de Mirassol-SP

Na última sexta-feira, dia 29/08/2014, na E.E. Edmur Neves da cidade de Mirassol, SP foi ministrado a 40 docentes da referida escola o Minicurso “História da Ciência e Meio Ambiente – as demandas por energia através da História”. O minicurso foi desenvolvido no Laboratório de Difusão Científica (LaDiC) do Grupo de Pesquisa Crescimento de Cristais e Materiais Cerâmicos pela pesquisadora Amanda Murgo sob orientação do Professor Antonio Carlos Hernandes. Participaram do minicurso, entre os professores, membros da equipe gestora.

Seminários do CCMC - Crystallization study of CaMgSi2O6 glasses containing Fe2O3, TiO2 or ZrO2 as additive

Resumo: CaMgSi2O6 (diopside) based glass-ceramics have gained interest due their potential applications in microelectronics and biomedicine. However, diopside glass of stoichiometric composition CaMgSi2O6 (CMS2) exhibits only surface nucleation when thermally treated. The addition of proper nucleating agents to glasses enables crystallization to occur in the sample volume. Furthermore, to obtain glass-ceramics with desired structure and properties a tight control of the crystallization process is a mandatory step. The purpose of this study is to search for potential nucleating agents for this particular glass. In our first experiments three metal oxides Fe2O3, TiO2 and ZrO2 were tested. Powder mixtures of oxides were melted, poured into a cylindrical steel mold, cooled, cut into 1.2 mm thick disks and polished.  DTA measurements was used to determine the thermal parameters and the optimal nucleation temperature for the glasses. The results showed a nucleating effect of Fe2O3.  CMS2 samples with 7 and 9% Fe2O3 nucleated at Tn for 8 h and crystallized at Tc (onset) for 10, 20, 30 and 40 min were examined by optical microscopy. This is an ongoing study that will be completed by analyzing the resulting structure of materials by DRX and spectroscopic methods as well as the resulting properties of the glass-ceramics.


Kinetic and Calorimetric Study of the Adsorption of Dyes on Mesoporous Activated Carbon Prepared from Coconut Coir Dust

Mesoporous activated carbon has been prepared from coconut coir dust as support for adsorption of some model dye molecules from aqueous solutions. The methylene blue (MB) and remazol yellow (RY) molecules were chosen for study of the adsorption capacity of cationic and anionic dyes onto prepared activated carbon. The adsorption kinetics was studied with the Lagergren first- and pseudo-second-order kinetic models as well as the intraparticle diffusion model. The results for both dyes suggested a multimechanism sorption process. The adsorption mechanisms in the systems dyes/AC follow pseudo-second-order kinetics with a significant contribution of intraparticle diffusion. The samples simultaneously present acidic and basic sites able to act as anchoring sites for basic and acidic dyes, respectively. Calorimetric studies reveal that dyes/AC interaction forces are correlated with the pH of the solution, which can be related to the charge distribution on the AC surface. These AC samples also exhibited very short equilibrium times for the adsorption of both dyes, which is an economically favorable requisite for the activated carbon described in this work, in addition to the local abundance of the raw material.

Neftali Lenin Villarreal Carreño, Jeremias de Souza Macedo, Nivan Bezerra da Costa Júnior, Luis Eduardo Almeida, Eunice Fragoso da Silva Vieira, Antonio Reinaldo Cestari, Iara de Fátima Gimenez, Ledjane Silva Barreto

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XXXVIII Congresso del Chimici Teorici di Esspresione Latine (Quitel 2012)


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galeria/ Fotomicrografia referente a uma fraturada realizada em mostra de SnO2 com alta densidade.
 

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