Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

By R. Viana, A. D. Silva, André Silva Pimentel. 2012

281 citations recorded by the source corpus.

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 CH2 asymmetric and symmetric stretching bands for the SDS molecule show a shift of 1.7 and 0.9 cm−1 to higher frequencies as the packing density increases, while it is observed a shift of 2.6 and 2.7 cm−1 for the HPS molecule, respectively. The DTAB molecule shows a shift of 4.5 cm−1 to lower frequencies for both CH2 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.

Subfields: Atomic and Molecular Physics, and Optics, Organic Chemistry, Spectroscopy

View Paper: https://www.semanticscholar.org/paper/907d7a1f2d23d92fac3ed3ccb7206385f883e935

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

  1. Jinsong Huang
  2. Yehao Deng
  3. Xiaopeng Zheng
  4. Jingjing Zhao
  5. Qi Wang
  6. Zhaolai Chen
  7. Bo Chen
  8. Jin‐Wook Lee

Citations in the corpus