Surface interactions and topological restrictions in liquids confined in nanopores. I. Light and neutron response in homologous systems

Rayleigh wing, Raman, FT-IR and IQENS data on Ethylene Glycol (EG), EG mono methyl ether and EG dimethyl ether in hulk and confined in silica 26 Angstr om porous glasses, also with modified inner surface. From the data analysis it turns out: i) The IQENS and Rayleigh wing spectra for confined EG (two OH end groups) show a distribution of relaxation times described by a Havri liak-Negami profile, ii) EG monomethyl ether tone OH end group), when confi ned, exhibits a frustration in the molecular mobility linked to geometrical restriction and surface interactions. iii) For EG dimethyl ether (no ON en d groups) the retardation processes are connected only to the physical trap s, and, in the spectra, a Lorentzian profile is recovered. iv) The O-H stre tching vibration analysis has been performed according to the current theor ies for associated liquids.