Effects of supercritical impregnation conditions on the properties of silica-titania aerogels
Effects of supercritical impregnation conditions on the properties of silica-titania aerogels
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DOI：
10.1016/s0022-3093(01)00424-0
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发表时间：
2001-06-01
影响因子：
3.5
通讯作者：
Sato, T
中科院分区：
文献类型：
--
作者：
Yoda, S;Otake, K;Sato, T
采用流动式装置，通过超临界浸渍异丙醇钛（TP）或用乙酰丙酮（TPAA）改性来制备二氧化硅-二氧化钛气凝胶。研究了TP/CO2 TPAA/CO2 混合物物理状态的影响。使用超临界 TP/CO2 或 TPAA/CO2 混合物在单相条件（353 K，20 MPa）下实现了对整体硅胶的均匀快速浸渍。使用该系统的浸渍二氧化钛的结晶是通过在浸渍后的减压过程中升高温度来实现的。 (C) 2001 Elsevier Science B.V. 保留所有权利。
The preparation of silica-titania aerogel by supercritical impregnation of titanium isopropoxide (TP) or modified with acetylacetone (TPAA) using flow type apparatus was performed. The influence of the physical state of TP/CO2 TPAA/CO2 mixture was investigated. Homogeneous and rapid impregnation on monolithic silica alcogel was achieved using supercritical TP/CO2 or TPAA/CO2 mixtures at the single phase condition (353 K, 20 MPa). Crystallization of impregnated titania using this system was attained by increasing temperature Juring the depressurization process after impregnation. (C) 2001 Elsevier Science B.V. All rights reserved.