Effect of pH, surface charge and counter-ions on the adsorption of sodium dodecyl sulfate to the sapphire/solution interface

Journal of Colloid and Interface Science
Ningning LiA R Rennie

Abstract

The role of ionic interactions between sodium dodecyl sulfate, SDS, and sapphire surfaces have been studied using specular neutron reflection to determine the structure and composition of adsorbed surfactant layers. Increasing the pH of the solution from 3 to 9 reduces the adsorption by reversing the charge of the alumina. This occurs at lower pH for the R-plane (1102) than the C-plane (0001), corresponding to the different points of zero charge. The largest surface excess is about 6.5 μmol m(-2), the thickness of the adsorbed layer is about 24 Å and it contains roughly 20% water. The hydrocarbon tails of the surfactant molecules clearly interpenetrate rather than form an ordered bilayer. The structure is similar in either pure water or in 0.1 M NaCl when the surfactant is at the respective critical micelle concentration. Different structures were seen with lithium and cesium dodecyl sulfate. The CsDS forms dense layers with little or no hydration and a surface excess of about 10.5 μmol m(-2). The metal cation strongly influences the hydration of the adsorbed surfactant. An overall picture of 'flattened micelles' for the structure of the adsorbed layer is observed.

References

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Jan 3, 2012·Journal of Colloid and Interface Science·Ningning LiAdrian R Rennie

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Citations

Jul 23, 2013·Journal of Colloid and Interface Science·Seung Yeon LeeAli Zarbakhsh
Jun 9, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Mary H WoodStuart M Clarke
Mar 12, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Rebecca J L WelbournStuart M Clarke
Mar 10, 2015·Journal of Colloid and Interface Science·Habauka M KwaambwaRobert Barker
Jul 22, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Finian J AllenStuart M Clarke
Aug 2, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Shreya ShamiAbanti Pradhan
Mar 31, 2018·Physical Review Letters·P KékicheffA Johner
Jan 12, 2021·Journal of Colloid and Interface Science·Finian J AllenStuart M Clarke

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