Observation of dynamic crossover and dynamic heterogeneity in hydration water confined in aged cement paste
- Massachusetts Institute of Technology (MIT)
- University of Florence
- ORNL
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 <{tau}> as a function of the inverse temperature is observed at T{sub L} = 231 {+-} 5 K, which coincides with a prominent peak in the differential scanning calorimetry cooling scan. The dynamic susceptibility {chi}{sub T}({tau}) 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 T{sub L}.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 941606
- Journal Information:
- Journal of Physics: Condensed Matter, Vol. 20, Issue 50
- Country of Publication:
- United States
- Language:
- English
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