The preparation and characterization of hydrotalcite micromembranes
The preparation and characterization of hydrotalcite micromembranes
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DOI：
10.1016/j.ces.2008.12.029
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发表时间：
2009-04-01
影响因子：
4.7
通讯作者：
Tsotsis, Theodore T.
中科院分区：
文献类型：
--
作者：
Kim, Tae Wook;Sahimi, Muhammad;Tsotsis, Theodore T.
本研究的重点是水滑石（HT）薄微膜的制备和了解其传输特性。HT微膜上的硅晶片和穿孔的不锈钢盘上制备，使用两种不同类型的HT胶体悬浮液，其特征在于各种表面技术，以及与单一气体渗透试验。电子显微镜观察表明，薄膜致密致密，与基体结合良好。对于Si基膜，中间γ-Al 2 O 3层的存在似乎改善了沉积的HT膜的特性。HT微膜的渗透性能的研究表明，理想的分离因子，超过相应的努森值。这些膜中的一些也对CO2具有选择透过性。这些HT微膜在传感器器件和膜微反应器中显示出良好的应用前景。(c)2009爱思唯尔有限公司版权所有。
The focus in this study is on preparing hydrotalcite (HT) thin micromembranes and on understanding their transport characteristics. HT micromembranes were prepared on silicon wafers and on perforated stainless steel discs, using two different types of HT colloidal suspensions, and were characterized by various surface techniques, as well as with single-gas permeation tests. Electron microscopy indicates that the HT films are compact and dense, and well-adhering on the substrates. For the Si-based membranes, the presence of an intermediate gamma-Al2O3 layer seemed to improve the characteristics of the deposited HT Films. The study of the permeation properties of the HT micromembranes indicated ideal separation factors that exceeded the corresponding Knudsen values. Some of these membranes were also permselective towards CO2. These HT micromembranes show good promise for application in sensor devices and in membrane microreactors. (c) 2009 Elsevier Ltd. All rights reserved.