Phys. Rev. Lett. 95, 117802 (2005) [4 pages]

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

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Li Liu¹, Sow-Hsin Chen^1,*, Antonio Faraone^1,2, Chun-Wan Yen³, and Chung-Yuan Mou³
¹Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
²Department of Material Science and Engineering, University of Maryland, College Park, MD 20742, USA and NIST Center for Neutron Research, Gaithersburg MD, 20899-8562, USA
³Department of Chemistry, National Taiwan University, Taipei 106, Taiwan, Republic of China

Received 12 June 2005; published 9 September 2005

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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.95.117802

DOI:

10.1103/PhysRevLett.95.117802

PACS:

61.20.Lc, 61.12.Ex, 61.20.Ja

^*Author to whom correspondence should be addressed. Electronic address: sowhsin@mit.edu

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Phys. Rev. Lett. 95, 117802 (2005) [4 pages]

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

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