New route for hollow materials

Autor(es)

Rivaldo-Gomez, C. M. ; Ferreira, F. F. ; Landi, G. T. ; Souza, J. A.

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 6, AUG 24 2016.
• Citações Web of Science: 4

Resumo

Hollow micro/nano structures form an important family of functional materials. We have used the thermal oxidation process combined with the passage of electric current during a structural phase transition to disclose a colossal mass diffusion transfer of Ti ions. This combination points to a new route for fabrication of hollow materials. A structural phase transition at high temperature prepares the stage by giving mobility to Ti ions and releasing vacancies to the system. The electric current then drives an inward delocalization of vacancies, condensing into voids, and finally turning into a big hollow. This strong physical phenomenon leading to a colossal mass transfer through ionic diffusion is suggested to be driven by a combination of phase transition and electrical current followed by chemical reaction. We show this phenomenon for Ti leading to TiO2 microtube formation, but we believe that it can be used to other metals undergoing structural phase transition at high temperatures. (AU)

• Processo FAPESP: 13/16172-5 - Síntese e caracterização das propriedades físicas de materiais nanoestruturados
• Beneficiário: José Antonio Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/09769-3 - Síntese e Caracterização de Propriedades Físicas de Microtubos
• Beneficiário: José Antonio Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/10900-4 - Síntese e Caracterização de Propriedades Físicas de Materiais com Estruturas Micro/Nano Hierárquicas
• Beneficiário: Cynthia Marina Rivaldo Gómez
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/01218-2 - Processos estocásticos aplicados a sistemas fora do equilíbrio
• Beneficiário: Gabriel Teixeira Landi
• Modalidade de apoio: Auxílio à Pesquisa - Regular