Observation of a dynamic crossover in water confined in double-wall carbon nanotubes

被引:67
作者
Chu, X.-Q.
Kolesnikov, A. I.
Moravsky, A. P.
Garcia-Sakai, V.
Chen, S.-H.
机构
[1] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA
[2] Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA
[3] MER Corp, Tucson, AZ 85706 USA
[4] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[5] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA
来源
PHYSICAL REVIEW E | 2007年 / 76卷 / 02期
关键词
D O I
10.1103/PhysRevE.76.021505
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
High-resolution quasielastic neutron scattering spectroscopy was used to measure H2O hydrated double-wall carbon nanotubes (DWNT). The measurements were made at a series of temperatures from 250 K down to 150 K. The relaxing-cage model was used to analyze the quasielastic spectra. We observed clear evidence of a fragile-to-strong dynamic crossover (FSC) at T-L=190 K in the confined water. We further show that the mean-square atomic displacement of the hydrogen atoms in water exhibits a sharp change in slope at approximately the same temperature 190 K. Comparing the result with that obtained from the confined water in hydrophilic porous silica material MCM-41, we demonstrate experimentally that water confined in a hydrophobic substrate exhibits a lower dynamic crossover temperature by Delta T-L approximate to 35 K.
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页数:6
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