文献类型：期刊文献

英文题名：Three-Dimensional Ordered Arrays of Zeolite Nanocrystals with Uniform Size and Orientation by a Pseudomorphic Coupled Dissolution-Reprecipitation Replacement Route

作者：Xia, Fang[1,3];Brugger, Joel[2,3];Ngothai, Yung[1];O'Neill, Brian[1];Chen, Guorong[4];Pring, Allan[2,3]

机构：[1]Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;[2]Univ Adelaide, Sch Earth & Environm Sci, Adelaide, SA 5005, Australia;[3]S Australian Museum, Dept Mineral, Adelaide, SA 5000, Australia;[4]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China

年份：2009

卷号：9

期号：11

起止页码：4902

外文期刊名：CRYSTAL GROWTH & DESIGN

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000271272900048)】；

基金：The authors are indebted to Prof. Andrew Putnis of the University of Munster for a helpful discussion on leucite twinning, to Dr. Peter Self of Adelaide Microscopy for technical assistance with FESEM and EBSD, to Ms. Jinwen Zhou for some experimental assistance, to Mr. Steve Laurie of the Sedgwick Museum, University of Cambridge, for providing the leucite crystals, and to A/Prof. Bill Skinner and Mr. Gujie Qian of University of South Australia for the access to polishing equipment. This work is financially supported by Australian Research Council (Project ID: DP0772299) and Australian Institute of Nuclear Science and Engineering.

语种：英文

摘要：We report a simple and facile hydrothermal pseudomorphic replacement route to synthesize three-dimensional (3D) ordered arrays of zeolite nanocrystals with uniform size and crystallographic orientation. We demonstrate this route by synthesizing analcime monoliths as an example using leucite crystals as precursors. The leucite crystals contain an inherent 3D ordered network of nanometer-sized lamellar twins. Such highly ordered 3D patterns were precisely preserved during hydrothermal pseudomorphic replacement reactions in pH buffered NaCl solutions, resulting in 3D ordered arrays of analcime nanocrystals. Moreover. these analcime nanocrystals have a uniform size and crystallographic orientation due to epitaxial nucleation and growth facilitated by the similarity of crystal lattice between leucite and analcime. The morphology of the nanocrystals is tunable by simply changing solution pH values. Mild acidic to mild alkaline conditions tend to produce cuboid-shaped nanocrystals, while strong alkaline conditions favor the formation of cylindrical-shaped nanocrystals. The replacement follows the coupled dissolution-reprecipitation mechanism that the rate of leucite dissolution equals the rate of analcime precipitation. This pseudomorphic replacement route has the potential to synthesize other ordered arrays of functional nanocrystals with controlled shape, size, and crystallographic orientation.