Pressure Dependence of Fragile-to-Strong Transition and a Possible Second Critical Point in Supercooled Confined Water

Journal Article · Fri Sep 09 00:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.117802· OSTI ID:20699426

Li, Liu; Chen, S -H ^[1]; Faraone, Antonio ^[1]; Yen, C -W; Mou, C -Y ^[2]

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1. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
2. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan (China)

By confining water in nanopores of silica glass, we can bypass the crystallization and study the pressure effect on the dynamical behavior in deeply supercooled state using neutron scattering. We observe a clear evidence of a cusplike fragile-to-strong (FS) dynamic transition. Here we show that the transition temperature decreases steadily with an increasing pressure, until it intersects the homogenous nucleation temperature line of bulk water at a pressure of 1600 bar. Above this pressure, it is no longer possible to discern the characteristic feature of the FS transition. Identification of this end point with the possible second critical point is discussed.

• OSTI ID: 20699426
• Journal Information: Physical Review Letters, Vol. 95, Issue 11; Other Information: DOI: 10.1103/PhysRevLett.95.117802; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALLIZATION
GLASS
NEUTRON DIFFRACTION
NUCLEATION
PRESSURE DEPENDENCE
SILICA
TRANSITION TEMPERATURE
WATER