The influence of DTABr surfactant on the electrokinetic and rheological properties of soda-activated bentonite dispersions

The influence of the cationic surfactant dodecyltrimethylammonium bromide (DTABr) on the electrokinetic and rheological properties of a soda-activated bentonite was investigated. The electrokinetic and rheological measurements of the surfactant–bentonite (2 wt.%) system were performed at three pH va...

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Bibliographic Details
Published in:Materials letters 2008-01, Vol.62 (1), p.81-84
Main Authors: İşçi, S., Günister, E., Alemdar, A., Ece, Ö.I., Güngör, N.
Format: Article
Language:English
Subjects:
Basal d-spacing
Dodecyltrimethylammonium bromide
Rheology
Soda-activated bentonite
Zeta potential
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Summary:The influence of the cationic surfactant dodecyltrimethylammonium bromide (DTABr) on the electrokinetic and rheological properties of a soda-activated bentonite was investigated. The electrokinetic and rheological measurements of the surfactant–bentonite (2 wt.%) system were performed at three pH values of 4, 8 and 12. The electrokinetic measurement results show that the DTABr was adsorbed on the bentonite mostly at pH 4 and 8, whereas X-ray diffraction (XRD) studies revealed that the DTABr surfactant enters the interlamellar space of the clay mineral at pH 8 and 12. Rheological data showed that the flow behavior changed with the surfactant concentration. The basal d (001)-spacings of DTABr-treated bentonite samples revealed expandability, from 14.8 to 16.8 Å. XRD results indicate a monolayer arrangement of the DTABr molecules parallel to the silicate layer.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2007.03.113