Adsorption of hexyl-alpha,omega-bis(dodecyldimethylammonium bromide) gemini surfactant on silica and its effect on wettability

Journal of Colloid and Interface Science
Meiwen CaoYilin Wang

Abstract

The adsorption of hexyl-alpha,omega-bis(dodecyldimethylammonium bromide) (C(12)C(6)C(12)Br(2)) gemini surfactant on silica and its effect on wettability have been studied. The structure of the adsorbed aggregates experiences an evolving course with the increase of C(12)C(6)C(12)Br(2) concentration. It is from no aggregates to circular islands, then to semicontinuous islands, and at last to the two-bilayer structure. No matter what kind of aggregates are in existence, their thickness values are to be the same 3.3+/-0.3 nm. The fraction of silica surface covered by the surfactant aggregates also varies from nearly zero at 0.05 mM to approximately 0.92 at 5.0 mM. The variation of contact angle against C(12)C(6)C(12)Br(2) concentration shows two distinct regions. The upward shift indicates that the surfactant molecules are adsorbed with their hydrophobic tails facing air upon increasing concentration, while the downward shift reveals that the surfactant aggregates are in existence with the hydrophilic headgroups facing air. IR spectra suggest that two different courses are involved with the increase of the surfactant concentration. One possible course is that the surfactant tails pack more closely and orderly, and the other may be ...Continue Reading

References

Dec 25, 2003·Journal of Colloid and Interface Science·Yakov I RabinovichBrij M Moudgil
Apr 5, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Annabelle BlomRaoul Zana
Apr 20, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Jinping DongRandal M Hill
Apr 20, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·James M MellottDaniel K Schwartz
May 26, 2005·Journal of Colloid and Interface Science·Kit Yan Chan, Ali Borhan
Dec 14, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Yangyang ShenM Silvina Tomassone

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Citations

Aug 22, 2009·Journal of Colloid and Interface Science·Stephen Chwastiak
Oct 24, 2006·International Journal of Biological Macromolecules·Dan WuYiming Li
Dec 25, 2007·Advances in Colloid and Interface Science·Santanu Paria
Sep 26, 2006·Journal of Colloid and Interface Science·Xiaoyan SongRobert K Thomas
Feb 13, 2007·Biomacromolecules·Dan WuYujun Feng

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