Near-infrared and mid-infrared spectroscopic study of sepiolites and palygorskites

Frost, Ray L., Locos, Oliver, Ruan, Huada, & Kloprogge, J. Theo (2001) Near-infrared and mid-infrared spectroscopic study of sepiolites and palygorskites. Vibrational Spectroscopy, 27(1), pp. 1-13.

View at publisher


Near-IR spectroscopy has been used to distinguish between palygorskites and sepiolites. Three near-IR spectral regions contain bands due to (a) the high frequency region between 6400 and 7400 cm−1 attributed to the first overtone of the hydroxyl stretching mode, (b) the 4800–5400 cm−1 region attributed to water combination modes and (c) the 4000–4800 cm−1 region attributed to the combination of the stretching and deformation modes of the M–MgOH units of palygorskites and sepiolites. Near-IR bands are observed in the first region and are assigned to the first overtone of the hydroxyl stretching frequency observed at 3620 and 3410 cm−1 in the mid-IR spectra. The near-IR bands observed in the second region are assigned to the combination of the water OH stretching and deformation vibrational modes. A complex set of low intensity bands are observed in the 4100–4600 cm−1 region and are attributed to the combination of the cation hydroxyl stretching, deformation and translation modes. The difference between the near-IR spectra of palygorskites and sepiolites depends on the dioctahedral nature of the palygorskites and the trioctahedral structure of the sepiolites. Changes in the near-IR spectra are therefore related to the Mg3(OH) and Mg2(OH) units in the palygorskites.

Impact and interest:

116 citations in Scopus
Search Google Scholar™
117 citations in Web of Science®

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.

ID Code: 22418
Item Type: Journal Article
Refereed: Yes
DOI: 10.1016/S0924-2031(01)00110-2
ISSN: 0924-2031
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2001 Elsevier
Deposited On: 17 Jun 2009 13:12
Last Modified: 04 Sep 2009 01:42

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page