TY - GEN
T1 - Dynamic crossover phenomenon in confined supercooled water and its relation to the existence of a liquid-liquid critical point in water
AU - Chen, Sow-Hsin
AU - Mallamace, F.
AU - Liu, L.
AU - Liu, D. Z.
AU - Chu, X. Q.
AU - Zhang, Y.
AU - Kim, C.
AU - Faraone, A.
AU - Mou, C. Y.
AU - Fratini, E.
AU - Baglioni, P.
AU - Kolesnikov, A. I.
AU - Garcia-Sakai, V.
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2008
Y1 - 2008
N2 - We have observed a Fragile-to-Strong Dynamic Crossover (FSC) phenomenon of the α-relaxation time and self-diffusion constant in confined supercooled water. The α-relaxation time is measured by Quasielastic Neutron Scattering (QENS) experiments and the self-diffusion constant by Nuclear Magnetic Resonance (NMR) experiments. Water is confined in 1-d geometry in cylindrical pores of nanoscale silica materials, MCM-41-S and in Double-Wall Carbon Nanotubes (DWNT). The crossover phenomenon can also be observed from appearance of a Boson peak in Incoherent Inelastic Neutron Scattering experiments. We observe a pronounced violation of the Stokes-Einstein Relation at and below the crossover temperature at ambient pressure. Upon applying pressure to the confined water, the crossover temperature is shown to track closely the Widom line emanating from the existence of a liquid-liquid critical point in an unattainable deeply supercooled state of bulk water. Relation of the dynamic crossover phenomenon to the existence of a density minimum in supercooled confined water is discussed. Finally, we discuss a role of the FSC of the hydration water in a biopolymer that controls the biofunctionality of the biopolymer. ©2008 American Institute of Physics.
AB - We have observed a Fragile-to-Strong Dynamic Crossover (FSC) phenomenon of the α-relaxation time and self-diffusion constant in confined supercooled water. The α-relaxation time is measured by Quasielastic Neutron Scattering (QENS) experiments and the self-diffusion constant by Nuclear Magnetic Resonance (NMR) experiments. Water is confined in 1-d geometry in cylindrical pores of nanoscale silica materials, MCM-41-S and in Double-Wall Carbon Nanotubes (DWNT). The crossover phenomenon can also be observed from appearance of a Boson peak in Incoherent Inelastic Neutron Scattering experiments. We observe a pronounced violation of the Stokes-Einstein Relation at and below the crossover temperature at ambient pressure. Upon applying pressure to the confined water, the crossover temperature is shown to track closely the Widom line emanating from the existence of a liquid-liquid critical point in an unattainable deeply supercooled state of bulk water. Relation of the dynamic crossover phenomenon to the existence of a density minimum in supercooled confined water is discussed. Finally, we discuss a role of the FSC of the hydration water in a biopolymer that controls the biofunctionality of the biopolymer. ©2008 American Institute of Physics.
KW - Density minimum of water
KW - Dynamic crossover phenomenon in hydration water
KW - Dynamic crossover phenomenon of confmed water
KW - Liquid-liquid critical point of water
KW - Quasielastic neutron scattering
KW - The Widom line
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U2 - 10.1063/1.2897826
DO - 10.1063/1.2897826
M3 - RGC 32 - Refereed conference paper (with host publication)
SN - 9780735405011
VL - 982
T3 - AIP Conference Proceedings
SP - 39
EP - 52
BT - Complex Systems - 5th International Workshop on Complex Systems
T2 - 5th International Workshop on Complex Systems
Y2 - 25 September 2007 through 28 September 2007
ER -