Abstract
A detailed spectroscopic analysis is presented in order to study the reorientational and vibrational dynamics of water and other fundamental H-bonded systems: ethylene glycol (HO−CH2−CH2−OH) and its homologous species, such as ethylene glycol monomethyl ether (CH3O−CH2−CH2−OH) and ethylene glycol dimethyl ether (CH3O−CH2−CH2−OCH3), propylene glycol (HO−CH(CH3)−CH2−OH) and its oligomers, that are confined in a matrix of sol−gel porous glasses with 26 A interconnected cylindrical pores. The use of different spectroscopic techniques, light scattering (Rayleigh wing and Raman scattering), FT-IR absorption, neutron scattering (incoherent quasi elastic and inelastic neutron scattering, IQENS and IINS, respectively) allow the marking of different dynamical parameters, with different probes being used to investigate H-bonded systems. The clear influence of the confinement on the mobility of the studied liquids, with a dramatic frozen-in observed effect respect to the bulk state, is evidenced and compared with li...
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