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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) April 19, 2010

The Dynamic Response Function χT(Q,t) of Confined Supercooled Water and its Relation to the Dynamic Crossover Phenomenon

  • Sow-Hsin Chen , Yang Zhang , Marco Lagi , X. Chu , Li Liu , Antonio Faraone , Emiliano Fratini and Piero Baglioni


We have made a series of Quasi-Elastic Neutron Scattering (QENS) studies of supercooled water confined in 3-D and 1-D geometries, specifically, interstitial water in aged cement paste (3-D) and water confined in MCM-41-S and Double Wall Nano Tube DWNT (1-D). In addition, we also include the cases of hydration water on protein surface and other biopolymer surfaces (pseudo 2-D). By analyzing the QENS spectra using Relaxing Cage Model (RCM), we are able to extract accurately the self-intermediate scattering function of hydrogen atoms FH(Q,t), at low-Q as a function of temperature T, showing an α-relaxation process at long time. We can then construct the Dynamic Response Function χT(Q,t) = -dFH(Q,t)/dT. χT(Q,t) as a function of t at constant Q shows a single peak at the characteristic α-relaxation time 〈τ〉, the amplitude of which grows as we approach the dynamic crossover temperature TL observed before in each of these geometries. However, the peak height of χT(Q,t) decreases after passing the crossover temperature TL. We make an argument to relate the occurrence of the extremum of the peak height in χT to the existence of the dynamic crossover temperature in each of these cases.

* Correspondence address: Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, CambridgeMA 02139, U.S.A.,

Published Online: 2010-4-19
Published in Print: 2010-2-1

© by Oldenbourg Wissenschaftsverlag, München, Germany

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