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Type: Artigo de periódico
Title: Porous shell/dense core structures prepared in tungsten phosphate glass through template-free route
Author: Correa, DN
Alves, OL
Mazali, IO
Abstract: The preparation of the 11.7Li(2)O-39.7WO(3)-10.9CaO-37.7P(2)O(5) glass (pgLWCP) was based on a one-step heat treatment of the 6Li(2)O-18WO(3)-43CaO-33P(2)O(5) (gLWCP) glass followed by leaching of the beta-Ca(2)P(2)O(7) phase formed during the crystallization process. The porous structure was formed in the region formerly occupied by the beta-Ca(2)P(2)O(7) phase. The gLWCP undergoes devitrification through surface crystallization. This process occurs after a thermal treatment in lower temperature and in a shorter period of time than that required for the complete crystallization. After acid leaching treatment, we obtained a core/shell-like structure with a very well-defined dense glass (gLWCP)/porous glass (pgLWCP) interface. The pgLWCP exhibits reversible coloration-decoloration reactions. (C) 2010 Elsevier B.V. All rights reserved.
Subject: Glasses
Microporous materials
Electron microscope
Country: Suíça
Editor: Elsevier Science Sa
Citation: Materials Chemistry And Physics. Elsevier Science Sa, v. 122, n. 1, n. 230, n. 236, 2010.
Rights: fechado
Identifier DOI: 10.1016/j.matchemphys.2010.02.039
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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