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Adsorption of Sodium Dodecyl Sulfate on Ge Substrate: The Effect of a Low-Polarity Solvent
Department of Chemistry and Molecular Physics, Institute of Chemistry of São Carlos, University of São Paulo,13560-970, São Carlos, SP, Brazil
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; in revised form: 16 May 2012 / Accepted: 15 June 2012 / Published: 28 June 2012
Abstract: 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
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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.
Viana RB, da Silva ABF, Pimentel AS. Adsorption of Sodium Dodecyl Sulfate on Ge Substrate: The Effect of a Low-Polarity Solvent. International Journal of Molecular Sciences. 2012; 13(7):7980-7993.
Viana, Rommel B.; da Silva, Albérico B. F.; Pimentel, André S. 2012. "Adsorption of Sodium Dodecyl Sulfate on Ge Substrate: The Effect of a Low-Polarity Solvent." Int. J. Mol. Sci. 13, no. 7: 7980-7993.