903272.fig.008a
(a)
903272.fig.008b
(b)
903272.fig.008c
(c)
903272.fig.008d
(d)
Figure 8: Selected regions of the FTIR spectra for the HPS molecule. (a) C–H stretching vibrational features; (b) methylene scissoring vibration and asymmetric bending mode of the head (N(CH3)3) methyl group. (c) CH2 wagging region; (d) sulfonate vibrational modes. The spectra refer to the HPS packing densities: , , , , and  molecules cm−2.