| Abstract
| - The conformation and melting of both hexadecylammonium ion, n-CH3(CH2)15NH3+, and neutralhexadecylamine, n-CH3(CH2)15NH2, within the clay silicate galleries have been studied by Fourier transforminfrared spectroscopy (FTIR). The conformational ordering of the alkyl tail in the confined system showsstrong dependence on amine concentration and orientation. While the amine chains with orientationparallel to the silicate layers are in various disordered states, those with orientation radiating from theclay surface take mostly ordered conformation. Ammonium ion shows a similar trend of ordering dependenceon the concentration as neutral amine, although the former has lower ordering than the latter, under thesame concentration level. Temperature-dependent FTIR study shows that the melting behavior of confinedamine corresponds to the chain melting process.
|
