Mesoporous Ta Oxide. 2. Improvement of the Synthetic Method and Observation of Mesostructure Formation

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• 作者：Junko N. Kondo ; Yoshiko Takahara ; Daling Lu ; and Kazunari Domen
• 刊名：Chemistry of Materials
• 出版年：2001
• 出版时间：April 2001
• 年：2001
• 卷：13
• 期：4
• 页码：1200 - 1206
• 全文大小：421K
• 年卷期：v.13,no.4(April 2001)
• ISSN：1520-5002

文摘

The ligand-assisted templating method for the production of mesoporous Ta₂O₅ wasimproved by the removal of noncoordinating alkylamine surfactant before aging. Theimproved method increased the uniformity of the porous structure and the particle size.The immediate precipitation after the hydrolysis of the alkylamine-coordinated Ta(OEt)₅allowed the detailed observation of the powder particles at each synthesis step by XRD, N₂adsorption isotherms, SEM, and TEM. TEM and XRD observations found that micelle rodsalready existed in particles formed soon after hydrolysis. Therefore, micelle rods weresuggested to be formed even in the absence of water. Final aging at 453 K encouraged thearrangement of the mesopores in a wormhole-like structure, which was evidenced by thetype H2 hysteresis loop of the desorption branch of N₂ adsorption-desorption isotherms inaddition to TEM images.