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Silylation of layered double hydroxides (1)

已有 4341 次阅读 2011-6-28 10:45 |个人分类:研研不息|系统分类:论文交流

 
Qi Tao§, Jianxi Zhu, Ray L. Frost*, Thor E. Bostrom, R. Mark Wellard, Jingming Wei, Peng Yuan and
Hongping He*
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, P.R. China
Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia
§ Graduate School of Chinese Academy of Sciences, Beijing 100039, P.R. China
 
Publication Date (Web): October 9, 2009
Copyright © 2009 American Chemical Society
 
*Corresponding authors. Phone: (+86) 85290257. Fax: (+86) 85290708. Email: hehp@gig.ac.cn (H.H.) or r.frost@qut.edu.au (R.L.F.).
 
Abstract

 

Silylated layered double hydroxides (LDHs) were synthesized through a surfactant-free method involving an in situ condensation of silane with the surface hydroxyl group of LDHs during its reconstruction in carbonate solution. X-ray diffraction (XRD) patterns showed the silylation reaction occurred on the external surfaces of LDHs layers. The successful silylation was evidenced by 29Si cross-polarization magic-angle spinning nuclear magnetic resonance (29Si CP/MAS NMR) spectroscopy, attenuated total reflection Fourier transform infrared (ATR FTIR) spectroscopy, and infrared emission spectroscopy (IES). The ribbon shaped crystallites with a “rodlike” aggregation were observed through transmission electron microscopy (TEM) images. The aggregation was explained by the T2 and T3 types of linkage between adjacent silane molecules as indicated in the 29Si NMR spectrum. In addition, the silylated products show high thermal stability by maintained Si related bands even when the temperature was increased to 1000 °C as observed in IES spectra.



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