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GEOREF RECORD

Adsorption of cetyltrimethylammonium ions on an acid-activated smectite and their thermal stability

Fethi Kooli and P. C. M. M. Magusin
Adsorption of cetyltrimethylammonium ions on an acid-activated smectite and their thermal stability
Clay Minerals (June 2005) 40 (2): 233-243

Abstract

The intercalation of the cationic surfactant cetyltrimethylammonium (C16TMA) into the interlayer of an acid-activated clay in the presence of different anions has been studied in detail. When Br or OH anions were used, the basal spacing increased significantly, the increase being related to the loading concentration of the surfactant solution. For intercalated compounds prepared from the hydroxide form, the basal spacing at room temperature varied from 1.6 to 3.8 nm. However, for organoclays prepared from the surfactant bromide, the basal spacing is almost loading-independent (1.9 nm). The use of hydroxide and bromide at higher pH is crucial to intercalating larger amounts of C16TMA cations and, hence, to improving the exfoliation of the silicate sheets. Magic-angle spinning (super 13) C nuclear magnetic resonance spectroscopy indicates that the intercalated surfactants exhibit a significant degree of gauche conformation. According to in situ powder X-ray diffraction, an increase of the basal spacing to 4.08 nm is observed at intermediate temperatures of 50 to 150 degrees C for organoclay with an initial basal spacing of 3.7 nm. At higher temperatures, decomposition of the surfactant occurs and the basal spacing decreases to approximately 1.4 nm.


ISSN: 0009-8558
EISSN: 1471-8030
Coden: CLMIAF
Serial Title: Clay Minerals
Serial Volume: 40
Serial Issue: 2
Title: Adsorption of cetyltrimethylammonium ions on an acid-activated smectite and their thermal stability
Affiliation: Institute of Chemical and Engineering Sciences, Jurong, Singapore
Pages: 233-243
Published: 200506
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 35
Accession Number: 2005-062412
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Eindhoven University of Technology, NLD, Netherlands
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200538
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