This paper describes the ordering degree of anionic, cationic, and zwitterionic surfactants with the increase of their packing density on Ge substrate by using Fourier transform infrared-attenuated total reflection (FTIR-ATR) spectroscopy. This work shows new insights on the conformational order of sodium dodecyl sulfate (SDS), N-hexadecyl-N-N-dimethyl-3-ammonio-1- propane-sulfonate (HPS), hexadecyl-trimethylammonium bromide (CTAB), and dodecyl trimethylammonium bromide (DTAB). DFT and semiempirical calculations are also performed in order to evaluate the effect of headgroup hydration and counterion. The CH 2 asymmetric and symmetric stretching bands for the SDS molecule show a shift of 1.7 and 0.9cm -1 to higher frequencies as the packing density increases, while it is observed a shift of 2.6 and 2.7cm^ -1 for the HPS molecule, respectively. The DTAB molecule shows a shift of 4.5cm -1 to lower frequencies for both CH 2 asymmetric and symmetric stretching bands as the packing density increases, indicating the decrease of gauche conformations and the increase of all-trans conformations over the aliphatic chain. © Copyright 2012 Rommel B. Viana et al.
CITATION STYLE
Viana, R. B., Da Silva, A. B. F., & Pimentel, A. S. (2012). Infrared spectroscopy of anionic, cationic, and zwitterionic surfactants. Advances in Physical Chemistry, 2012. https://doi.org/10.1155/2012/903272
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