Figure 4: Selected regions of the FTIR spectra for the DTAB molecule. (a, b) C–H stretching vibrational features; (c, d) methylene scissoring vibration and asymmetric bending mode of the head [N(CH3)3] methyl group. (e) CH2 wagging region; (f) C–N stretching vibrational modes. (a) and (b) spectra refer to the DTAB packing densities: and molecules cm−2, respectively. (b), (d), (e), and (f) spectra refer to the DTAB packing densities: , , , and molecules cm−2, respectively.