ZHU Jian-x i1, MA Yue-hong2, QING Yan-hong1,3, SHEN Wei1, 3, WEI Jing-ming1, YUAN Peng1, HE Hong-ping1
1. Guangzhou Institute of Geochemistry , Chinese Academy of Sciences , Guangzhou 510640, China;
2. Ningbo Institute of Material Technology and Engineer ing, Chinese Academy of Sciences , ZhejiangNingbo 315201, China;
3. The Graduate School of Chinese Academy of Sciences , Beijing 100049, China
Abstract: The organic pillared montmorillonite were synthesized by using the cationic surfactant with different alkyl chain length and chain numbers. According to the XRD result s, the basal spacing of the organic montmorillonites modified by a s ingle alkyl chain surfactant increase with increase of the length of alkyl chains, and the wet samples own the higher basal spacing than that of the dry samples. The XRD patterns of wet samples were sharper than that of the dry samples, which means a more uniform structure in the wet organic montmorillonites. For the organic montmorillonite which pillared by surfactant with double alkyl chains, the basal spacing were in direct proportion to the length of alkyl chains, but the wet samples of with double chains own the smaller basal spacing that dry samples. The FT IR spectra showed that both antisymmetric and stretching CH2 absorption bands shift to lower frequencies with the increase of surfactant loading, alkyl chain's length and number of chains, which elucidate the increase of ordered conformation. Also, the present study demonstrates that the alkyl chain length and number have effect on the molecular environment.
Key words: organic montmorillonite; micros tructure; molecular environment ; insitu
Bulletin of Mineralogy, Petrology and Geochemistry Vol. 30, No.1, 2011, page 46-52
(Source from http://www.cnki.com.cn/)
|
