Abstract
High resolution quasi-elastic neutron scattering is used to investigate the slow dynamics of hydration water confined in calcium silicate hydrate gel in an aged cement paste at supercooled temperatures. A super-Arrhenius to Arrhenius dynamic crossover of the average translational relaxation time as a function of the inverse temperature is observed at TL = 231 5K, which coincides with a prominent peak in the differential scanning calorimetry cooling scan. The dynamic susceptibility χT(t) calculated using the experimentally determined temperature dependence of the self-intermediate scattering function shows direct evidence of the enhanced dynamic fluctuations and the associated growth in size of the dynamic heterogeneity in the confined water on approaching TL.
Original language | English |
---|---|
Article number | 502101 |
Journal | Journal of Physics Condensed Matter |
Volume | 20 |
Issue number | 50 |
DOIs | |
State | Published - Dec 17 2008 |
Externally published | Yes |