Biopolymer films have several industrial applications because they are environmentally sustainable. Cassava starch is a biopolymer that is easily available, but has limitations: it is hydrophilic, poorly resistant and degradable. The improvement of these properties was proposed in this research from the use of bentonite clay (BT) as a filling material. The compatibilization of this in the polymer matrix was obtained by ion exchange with an organic anionic surfactant. The formation of intercalated or exfoliated starch nanocomposites in the presence of natural or modified clay was characterized by XRD, FTIR, AFM and SEM. The improvement of water vapor, thermal and mechanical properties was investigated by WVP, solubility, TGA and tensile test. The starch nanocomposites in the presence of modified clay showed a better result than those of natural clay. There was no significant difference in the color of the starch film in the presence of the natural or modified clay.
Nanostructured niobium nitride was synthesized through a solid-gas reaction in an atmosphere of nitrogen and hydrogen using an oxalic niobium precursor. Crystal phases evolution throughout the reactive processes were evaluated using X-Ray Diffraction, reaction parameters modifications were performed in isotherm time, gas flow, and precursors' mass. It was verified the synthesis of a stable NbN material with a hexagonal structure under the following conditions: 1g of precursor, 300 min of isotherm at 1100 °C and, the gas flow of N 2 = 40% (v/v), and H 2 = 60% (v/v). The increase in gas phase flow and the decrease of solid load favored the process, and a pure and single-phase powder was obtained. This set indicates the importance of physical resistance in the fluid-particle interaction process. Under these conditions, the solid obtained had a crystallite size of 30 -50 nm.
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APRESENTAÇÃOCaro leitor(a)Nesta obra temos um compendio de pesquisas realizadas por alunos e professores atuantes em engenharia e tecnologia. São apresentados trabalhos teóricos e vários resultados práticos de diferentes formas de aplicação e abordagens de simulação, projetos e caracterização no âmbito da engenharia e aplicação de tecnologia.Tecnologia é o pilar mais importante da engenharia. Os profissionais que se dedicam a pesquisa e desenvolvimento de novos produtos e processos não estão preocupados com todos os aspectos da tecnologia, mas com a tecnologia existente, bem como com a tecnologia futura considerada viável. Uma visão ampla de tecnologia é portando fundamental para engenheiros. É esta amplitude de áreas e temas que procuramos reunir neste livro.De abordagem objetiva, a obra se mostra de grande relevância para graduandos, alunos de pós-graduação, docentes e profissionais, apresentando temáticas e metodologias diversificadas, em situações reais Aos autores, agradecemos pela confiança e espirito de parceria.
Boa leituraFranciele Bonatto
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