Effect of cationic surfactant adsorption on the rheological and surface properties of bentonite dispersions

In this study, the adsorption, bridging, and intercalation effects of a cationic surfactant, benzyldimethyltetradecyl ammonium chloride (BDTDACl), on bentonite clay suspensions was investigated. The adsorption, rheological behaviors, and colloidal properties of the clay dispersions were determined a...

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Bibliographic Details
Published in:Journal of colloid and interface science 2006-11, Vol.303 (1), p.137-141
Main Authors: Günister, Ebru, İşçi, Sevim, Öztekin, Nevin, Erim, F. Bedia, Ece, Ö. Işık, Güngör, Nurfer
Format: Article
Language:English
Subjects:
Adsorption
Bentonite
Cationic surfactant
Chemistry
Exact sciences and technology
General and physical chemistry
Rheology
Surface physical chemistry
Zeta potential
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Summary:In this study, the adsorption, bridging, and intercalation effects of a cationic surfactant, benzyldimethyltetradecyl ammonium chloride (BDTDACl), on bentonite clay suspensions was investigated. The adsorption, rheological behaviors, and colloidal properties of the clay dispersions were determined as a function surfactant concentration. Adsorption isotherms were obtained using the batch-equilibrium technique. The rheological behavior of the clay suspensions was obtained by shear stress-shear rate measurements within 0–350 s−1 shear rates. The structure of the composite particles was analyzed by using X-ray diffraction analysis and it was found that the expansions of basal d-spacings are less than 16.80 Å, suggesting a monolayer structure. Around 6 mmol/L surfactant addition gives the maximum flocculation, as after further addition the system begins defloculate.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2006.07.021