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

被引：39

作者：

Zhang, Y. ^{[1
]}

Lagi, M. ^{[1
,2
,3
]}

Ridi, F. ^{[2
,3
]}

Fratini, E. ^{[2
,3
]}

Baglioni, P. ^{[2
,3
]}

Mamontov, E. ^{[4
]}

Chen, S. H. ^{[1
]}

机构：

[1] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA

[2] Univ Florence, Dept Chem, I-50019 Florence, Italy

[3] Univ Florence, CSGI, I-50019 Florence, Italy

[4] Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2008年 / 20卷 / 50期

关键词：

D O I：

10.1088/0953-8984/20/50/502101

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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-L = 231 +/- 5 K, which coincides with a prominent peak in the differential scanning calorimetry cooling scan. The dynamic susceptibility chi(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.

引用

页数：6

共 33 条

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