Important Property of Polymer Spheres for the Preparation of Three-Dimensionally Ordered Macroporous (3DOM) Metal Oxides by the Ethylene Glycol Method: The Glass-Transition Temperature

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• 作者：Masahiro Sadakane ; Keisuke Sasaki ; Hiroki Nakamura ; Takashi Yamamoto ; Wataru Ninomiya ; Wataru Ueda
• 刊名：Langmuir
• 出版年：2012
• 出版时间：December 21, 2012
• 年：2012
• 卷：28
• 期：51
• 页码：17766-17770
• 全文大小：238K
• 年卷期：v.28,no.51(December 21, 2012)
• ISSN：1520-5827

文摘

We demonstrate that the glass-transition temperature (T_g) of a polymer sphere template is a crucial factor in the production of three-dimensionally ordered macroporous (3DOM) materials. Metal nitrate dissolved in ethylene glycol鈥搈ethanol was infiltrated into the void of a face-centered, close-packed colloidal crystal of poly(methyl methacrylate) (PMMA)-based spheres. The metal nitrate reacts with EG to form a metal oxalate (or metal glycoxylate) solid (nitrate oxidation) in the void of the template when the metal nitrate鈥揈G鈥揚MMA composite is heated. Further heating converts metal oxalate to metal oxide and removes PMMA to form 3DOM materials. We investigated the effect of T_g of PMMA templates and obtained clear evidence that the solidification temperature of the metal precursor solution (i.e., nitration oxidation temperature) should be lower than the T_g of the polymer spheres to obtain a well-ordered 3DOM structure.