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Colloid and Polymer Science

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01-02-2014 | Original Contribution

Effect of cetyltrimethylammonium bromide addition on the emulsions stabilized by montmorillonite

Authors: Jingchun Zhang, Lu Li, Jian Xu, Dejun Sun

Published in: Colloid and Polymer Science | Issue 2/2014

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Abstract

The wettability of montmorillonite could be in situ modified by cationic surfactant cetyltrimethylammonium bromide (CTAB). The type and stability of emulsions prepared from montmorillonite with different concentrations of cationic surfactant were investigated, and a double phase inversion of emulsions was observed. The adsorption of CTAB on montmorillonite particles was studied by surface tension and zeta potential measurements, and the variation of the wettability of particles with the concentration of CTAB was characterized by the contact angle measurements. The adsorption of particles at the surface of emulsion droplets was observed by laser-induced confocal scanning microscopy. At low surfactant concentrations, the adsorption of CTAB on montmorillonite increased the hydrophobicity of the particles, and the stability of oil-in-water emulsions was enhanced. With the increase of the CTAB concentration, montmorillonite particles changed from hydrophilic to hydrophobic, and water-in-oil emulsions were obtained. However, at higher surfactant concentrations, the emulsions inverts to O/W again because montmorillonite particles were reconverted into hydrophilic due to the formation of CTAB bilayer on the surface of montmorillonite.

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Title: Effect of cetyltrimethylammonium bromide addition on the emulsions stabilized by montmorillonite
Authors: Jingchun Zhang
Lu Li
Jian Xu
Dejun Sun
Publication date: 01-02-2014
Publisher: Springer Berlin Heidelberg
Published in: Colloid and Polymer Science / Issue 2/2014
Print ISSN: 0303-402X
Electronic ISSN: 1435-1536
DOI: https://doi.org/10.1007/s00396-013-3089-4

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