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

Y. Zhang; M. Lagi; F. Ridi; E. Fratini; P. Baglioni; E. Mamontov; S. H. Chen

doi:10.1088/0953-8984/20/50/502101

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

Y. Zhang
, M. Lagi
, F. Ridi
, E. Fratini
, P. Baglioni
, E. Mamontov
, S. H. Chen

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

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 T_L = 231 5K, which coincides with a prominent peak in the differential scanning calorimetry cooling scan. The dynamic susceptibility χ_T(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 T_L.

Original language	English
Article number	502101
Journal	Journal of Physics Condensed Matter
Volume	20
Issue number	50
DOIs	https://doi.org/10.1088/0953-8984/20/50/502101
State	Published - Dec 17 2008
Externally published	Yes

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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 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.",

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T1 - Observation of dynamic crossover and dynamic heterogeneity in hydration water confined in aged cement paste

AU - Zhang, Y.

AU - Lagi, M.

AU - Ridi, F.

AU - Fratini, E.

AU - Baglioni, P.

AU - Mamontov, E.

AU - Chen, S. H.

PY - 2008/12/17

Y1 - 2008/12/17

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/58149327340

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DO - 10.1088/0953-8984/20/50/502101

M3 - Article

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SN - 0953-8984

VL - 20

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

IS - 50

M1 - 502101

ER -

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

Abstract

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