Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Figure 1

Selected regions of the FTIR spectra for the SDS molecule: (a) C–H stretching vibrational features; (b) methylene scissoring vibrational mode; (c) and (d) sulfate asymmetric and symmetric stretching bands, respectively. The spectra refer to the SDS packing densities: 1.2×10¹⁵; 4.8×10¹⁵; 3.5×10¹⁶; 4.3×10¹⁷ molecules cm⁻².

(a)

(b)

(c)

(d)