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Phys. Rev. E 65, 040501(R) (2002) [4 pages]

Rotational dynamics of hydration water in dicalcium silicate by quasielastic neutron scattering

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A. Faraone1,2, S.-H. Chen1, E. Fratini1,3, P. Baglioni1,3, L. Liu1, and C. Brown4
1Department of Nuclear Engineering, 24-209 MIT, Cambridge, Massachusetts 02139
2Department of Physics and INFM, University of Messina, Contrada Papardo, Salita Sperone 31, 98121 Messina, Italy
3Department of Chemistry and CSGI, University of Florence, via della Lastruccia 3-Sesto F.no, 50019 Florence, Italy
4Department of Material and Nuclear Engineering, University of Maryland, College Park, Maryland 207421 and NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 208991

Received 11 February 2002; published 8 April 2002

Quasielastic neutron scattering (QENS) has been used to investigate the single-particle dynamics of interfacial water in dicalcium silicate (C2S)/water paste. Our previous neutron-scattering studies on interfacial water have focused attention on the translational dynamics of the center of mass of water molecules. In this paper, we have collected QENS data on a wider range of wave-vector transfer so that both translational and rotational motions of water molecules are detected. The data have been analyzed by models for translation and rotation we recently proposed for supercooled water. The evolution of the parameters describing the relaxational dynamics of water embedded in the C2S matrix is given at temperature T=303 K as a function of the curing time.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevE.65.040501
DOI:
10.1103/PhysRevE.65.040501
PACS:
61.20.Lc, 61.12.Ex, 64.70.Pf
 
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