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Суворов, С. А.; Turkin, I. A.; Printsev, L. N.

doi:10.1023/a:1011362118525

Cited by 2 publications

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References 3 publications

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“…α-Alumina (corundum) is much more chemically and thermally stable than β-alumina. − Corundum crystals are stable in strongly basic or acidic solution and in air above 1000 °C, making them attractive for catalyst supports and membranes for operations in harsh environments. − As these applications generally require the nanoscale size and porosity of the corundum materials, it is thus essential to prepare them with mesoporous structures. , In order to transform the alumina/silicon composites into mesoporous nanoscale corundum films, we investigated means to remove the silicon. We found that immersing the alumina/silicon composites in a concentrated NaOH(aq) solution yields iridescent gray films that are more brittle than the pristine composites, due to the formation of porous structures as presented below (Figure a).…”

Section: Resultsmentioning

confidence: 93%

Hard Photonic Glasses and Corundum Nanostructured Films from Aluminothermic Reduction of Helicoidal Mesoporous Silicas

2016

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We have investigated the aluminothermic reduction of photonic chiral nematic mesoporous silica films templated by cellulose nanocrystals. The mechanical hardness and ordered structure of aluminothermally reduced materials are found to be dependent on the surface contact between aluminum and silica reactants. By heating the silica films in close contact with aluminum, the silica films undergo a surface aluminothermic reduction to generate photonic mesoporous glasses with enhanced mechanical hardness. The aluminothermic reduction of the silica is significantly enhanced when the reactants are in direct contact, transforming the helicoidal mesoporous silica films into colorful, stiff alumina/silicon replicas. Iridescent mesoporous films of corundum and corundum/silicon nanostructures are obtained from the alumina/silicon composites by selective etching of impurities. Our findings demonstrate that the aluminothermic reduction of silica is a simple process to improve the mechanical strength of chiroptical mesoporous glasses and is also a new one-step hard templating of hierarchically mesoporous corundum-based nanomaterials.

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Section: Resultsmentioning

confidence: 93%

Hard Photonic Glasses and Corundum Nanostructured Films from Aluminothermic Reduction of Helicoidal Mesoporous Silicas

2016

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Sinterização de cerâmicas em microondas. Parte I: aspectos fundamentais

2007

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ResumoO processamento de materiais baseado no aquecimento por meio de energia de microondas vem ganhado a cada dia mais destaque e importância em várias aplicações industriais, em virtude de uma série de vantagens em potenciais frente aos métodos convencionais de aquecimento. Na sinterização de materiais cerâmicos o uso de microondas permite redução no tempo de processamento, economia de energia e melhora na uniformidade microestrutural dos corpos cerâmicos. Como conseqüência das vantagens frente às técnicas de aquecimentos convencionais, a sinterização usando microondas vem sendo estudada por vários grupos de pesquisa em todo o mundo. Entretanto, os benefícios do uso das microondas só são obtidos quando a sinterização é realizada com o controle e entendimento científico de uma série de parâmetros e aspectos envolvidos no processo. Assim, esse trabalho tem por objetivo abordar aspectos científicos fundamentais do processo de sinterização de cerâmicas usando microondas, enfocando particularmente a interação matéria/microondas, aspectos peculiares do processo e a técnica de sinterização híbrida. Palavras-chave: microondas, sinterização, cerâmicas. Abstract Processing of materials based on heating by microwave energy has gained increasing importance in many industrial applications due to its potential advantages over conventional heating methods.In the sintering of ceramic materials, the use of microwave energy decreases the processing time, saves energy and improves the microstructural homogeneity of ceramic bodies. These advantages have motivated various research groups around the world to study microwave sintering. However, the benefits deriving from the use of microwaves depend on the control and scientific understanding of the parameters and aspects of the process. This paper offers a review of the fundamental scientific aspects of microwave sintering of ceramics, focusing on the interaction between materials and microwaves and highlighting particular points of the hybrid sintering process and methodology.

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Cited by 2 publications

References 3 publications

Hard Photonic Glasses and Corundum Nanostructured Films from Aluminothermic Reduction of Helicoidal Mesoporous Silicas

Hard Photonic Glasses and Corundum Nanostructured Films from Aluminothermic Reduction of Helicoidal Mesoporous Silicas

Sinterização de cerâmicas em microondas. Parte I: aspectos fundamentais

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