Quasi elastic and inelastic neutron scattering study of vitamin C aqueous solutions

F. Migliardo, C. Branca, S. Magazù, P. Migliardo, S. Coppolino, A. Villari and N. Micali

Physica A: Statistical Mechanics and its Applications, 2002, vol. 304, issue 1, 294-298

Abstract: In this paper, new results obtained by quasi elastic and inelastic neutron scattering experiments performed on vitamin C (L-ascorbic acid)/H2O mixtures are reported. The data analysis of the QENS measurements, by a separation of the diffusive dynamics of hydrated L-ascorbic acid from that of water, furnishes quantitative evidences of a random jump diffusion motion of vitamin C and shows that the water dynamics is strongly affected by the presence of L-ascorbic acid. Concerning the INS experiment, we are able, through the behaviour of neutron spectra across the glass transition temperature (Tg≈233K for the vitamin C/water system), to collocate the investigated system in the Angell “strong-fragile” scheme.

Keywords: Neutron scattering; Diffusion; Vibrational states (search for similar items in EconPapers)
Date: 2002
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:304:y:2002:i:1:p:294-298

DOI: 10.1016/S0378-4371(01)00521-0

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