Low-temperature dynamics of water confined in a hydrophobic mesoporous material.
Quasielastic neutron scattering was used to study the dynamics of three-dimensional confined water in a hydrophobic mesoporous material designated as CMK-1 in the temperature range from 250 to 170 K. We observe a crossover phenomenon at temperature T(L) . We find that T(L) of water confined in CMK-1 occurs in between previous observations of one-dimensional confined water in materials with different hydrophilicities. This provides the first evidence that besides the obvious surface effect brought about by the hydrophobic confinements, T(L) is also dependent on the dimensionality of the geometry of the confinement.
Chu
Xiang-qiang
XQ
Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, 02139, USA.
Liu
Kao-Hsiang
KH
Tyagi
Madhu Sudan
MS
Mou
Chung-Yuan
CY
Chen
Sow-Hsin
SH