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Title: Observation of dynamic crossover and dynamic heterogeneity in hydration water confined in aged cement paste

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 <{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}.

Authors:
 [1];  [1];  [2];  [2];  [2];  [3];  [1]
  1. Massachusetts Institute of Technology (MIT)
  2. University of Florence
  3. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
941606
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Physics: Condensed Matter
Additional Journal Information:
Journal Volume: 20; Journal Issue: 50
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CALCIUM SILICATES; CALORIMETRY; CEMENTS; FLUCTUATIONS; HYDRATES; HYDRATION; NEUTRONS; RELAXATION TIME; RESOLUTION; SCATTERING; TEMPERATURE DEPENDENCE; WATER

Citation Formats

Zhang, Y, Lagi, M, Ridi, F, Fratini, E, Baglioni, P, Mamontov, Eugene, and Chen, SH. Observation of dynamic crossover and dynamic heterogeneity in hydration water confined in aged cement paste. United States: N. p., 2008. Web. doi:10.1088/0953-8984/20/50/502101.
Zhang, Y, Lagi, M, Ridi, F, Fratini, E, Baglioni, P, Mamontov, Eugene, & Chen, SH. Observation of dynamic crossover and dynamic heterogeneity in hydration water confined in aged cement paste. United States. https://doi.org/10.1088/0953-8984/20/50/502101
Zhang, Y, Lagi, M, Ridi, F, Fratini, E, Baglioni, P, Mamontov, Eugene, and Chen, SH. Sat . "Observation of dynamic crossover and dynamic heterogeneity in hydration water confined in aged cement paste". United States. https://doi.org/10.1088/0953-8984/20/50/502101.
@article{osti_941606,
title = {Observation of dynamic crossover and dynamic heterogeneity in hydration water confined in aged cement paste},
author = {Zhang, Y and Lagi, M and Ridi, F and Fratini, E and Baglioni, P and Mamontov, Eugene and Chen, SH},
abstractNote = {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}.},
doi = {10.1088/0953-8984/20/50/502101},
url = {https://www.osti.gov/biblio/941606}, journal = {Journal of Physics: Condensed Matter},
number = 50,
volume = 20,
place = {United States},
year = {2008},
month = {11}
}