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NMR Study of Slow Motions of HDA Hydrocarbons Chains Inside Lamellar Structures

Measurements of 1H and 13C Nuclear Magnetic Resonance (NMR) for the nanocomposite materials formed by the intercalation of hexadecylamine (HDA) in metal oxides (TiO2, V2O5 and MoO3), are reported. The 1H NMR spin-lattice relaxation in the rotating frame was described by using the spectral density due to Davidson and Cole, which incorporates a distribution of correlation times characterized by a width parameter ϵ. The fitting of the data was obtained for ϵ = 0.74, indicating that the correlation times are distributed over a narrow range in this system. High-resolution 13C NMR techniques were used to resolve the NMR lines of middle-chain methylene groups in the spectra and variable contact time cross-polarization {1H-}13C experiments were employed to analyze the reorientation dynamics of the CH3 and CH2 groups in the HDA chains.