Characterization of organic phases in the interlayer of montmorillonite using FTIR and 13C NMR

Zhu, Jianxi, He, Hongping, Zhu, Lizhong, Wen, Xiaoyan, & Deng, Feng (2005) Characterization of organic phases in the interlayer of montmorillonite using FTIR and 13C NMR. Journal of Colloid and Interface Science, 286(1), pp. 239-244.

View at publisher


The molecular conformation and mobility of the intercalated surfactant molecules, cetyltrimethylammonium bromide (CTMAB), have been studied using Fourier transform IR spectroscopy (FTIR) and high-resolution single-pulse 13C magic-angle-spinning nuclear-magnetic-resonance (13C SP MAS NMR) spectroscopy. Conformation and mobility of alkyl chains was found to be a function of the surfactant concentration. The splitting of the methylene scissoring mode at 1473-1463 cm-1 and the rocking mode at 730-720 cm-1 in FTIR is considered to be diagnostic of the packing density increase of the intercalated surfactants within the clay gallery. Compare with the 13C SP MAS NMR spectrum of CTMAB in the bulk state, 1~ 3 ppm upfield chemical shifts for end-methyl (δC16) and methylene (δC15, δC2-14) of the intercalated surfactant molecules in the hybrids indicate the more free conformational situation. For these hybrids, the conformational freedom decrease with the increase of surfactant concentration. In addition, ~2 ppm downfield shift for the C1 carbon atom in the hybrids with higher surfactant content suggests a special local environment. This study demonstrates the different mobility of carbon atoms in the intercalated alkyl chain.

Impact and interest:

120 citations in Scopus
113 citations in Web of Science®
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

503 since deposited on 07 Apr 2006
12 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 3864
Item Type: Journal Article
Refereed: Yes
Keywords: Nanochemistry, Montmorillonite, Alkylammonium, Organic phase, FTIR, NMR
DOI: 10.1016/j.jcis.2004.12.048
ISSN: 0021-9797
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 07 Apr 2006 00:00
Last Modified: 10 Aug 2011 18:39

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page