Inelastic neutron scattering studies of ultrafine hydroxylated silica particles show evidence of weakly hindered hydroxyl rotations at low temperatures and, at higher temperatures, enhanced low-energy vibrational (phonon) scattering. Continuum vibrational models widely used to interpret small-particle heat-capacity measurements are found to be inadequate to explain the observed low-energy enhancement which is better described by a microscopic model in which surface-atom as well as bulk-atom force constants are specifically taken into account.
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Richter et al. (1982) studied this question.
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