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Int. J. Mol. Sci. 2012, 13(7), 7980-7993; doi:10.3390/ijms13077980

Adsorption of Sodium Dodecyl Sulfate on Ge Substrate: The Effect of a Low-Polarity Solvent

1,* , 1
1 Department of Chemistry and Molecular Physics, Institute of Chemistry of São Carlos, University of São Paulo,13560-970, São Carlos, SP, Brazil 2 Department of Chemistry, Pontifical Catholic University of Rio de Janeiro, 22453-900, Rio de Janeiro, RJ, Brazil
* Author to whom correspondence should be addressed.
Received: 7 February 2012 / Revised: 16 May 2012 / Accepted: 15 June 2012 / Published: 28 June 2012
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This paper describes the adsorption of sodium dodecyl sulfate (SDS) molecules in a low polar solvent on Ge substrate by using Fourier transform infrared-attenuated total reflection (FTIR-ATR) spectroscopy and atomic force microscopy (AFM). The maximum SDS amount adsorbed is (5.0 ± 0.3) × 1014 molecules cm−2 in CHCl3, while with the use of CCl4 as subphase the ability of SDS adsorbed is 48% lower. AFM images show that depositions are highly disordered over the interface, and it was possible to establish that the size of the SDS deposition is around 30–40 nm over the Ge surface. A complete description of the infrared spectroscopic bands for the head and tail groups in the SDS molecule is also provided.
Keywords: anionic surfactant; vibrational spectra; dichroism; deposition anionic surfactant; vibrational spectra; dichroism; deposition
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Viana, R.B.; da Silva, A.B.F.; Pimentel, A.S. Adsorption of Sodium Dodecyl Sulfate on Ge Substrate: The Effect of a Low-Polarity Solvent. Int. J. Mol. Sci. 2012, 13, 7980-7993.

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