Literature DB >> 21932907

Resolving the controversy on the glass transition temperature of water?

S Capaccioli1, K L Ngai.   

Abstract

We consider experimental data on the dynamics of water (1) in glass-forming aqueous mixtures with glass transition temperature T(g) approaching the putative T(g) = 136 K of water from above and below, (2) in confined spaces of nanometer in size, and (3) in the bulk at temperatures above the homogeneous nucleation temperature. Altogether, the considered relaxation times from the data range nearly over 15 decades from 10(-12) to 10(3) s. Assisted by the various features in the isothermal spectra and theoretical interpretation, these considerations enable us to conclude that relaxation of un-crystallized water is highly non-cooperative. The exponent β(K) of its Kohlrausch stretched exponential correlation function is not far from having the value of one, and hence the deviation from exponential time decay is slight. Albeit the temperature dependence of its α-relaxation time being non-Arrhenius, the corresponding T(g)-scaled temperature dependence has small steepness index m, likely less than 44 at T(g), and hence water is not "'fragile" as a glassformer. The separation in time scale of the α- and the β-relaxations is small at T(g), becomes smaller at higher temperatures, and they merge together shortly above T(g). From all these properties and by inference, water is highly non-cooperative as a glass-former, it has short cooperative length-scale, and possibly smaller configurational entropy and change of heat capacity at T(g) compared with other organic glass-formers. This conclusion is perhaps unsurprising because water is the smallest molecule. Our deductions from the data rule out that the T(g) of water is higher than 160 K, and suggest that it is close to the traditional value of 136 K.
© 2011 American Institute of Physics

Entities:  

Year:  2011        PMID: 21932907     DOI: 10.1063/1.3633242

Source DB:  PubMed          Journal:  J Chem Phys        ISSN: 0021-9606            Impact factor:   3.488


  9 in total

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6.  Molecular probe dynamics reveals suppression of ice-like regions in strongly confined supercooled water.

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Journal:  Sci Rep       Date:  2013-01-15       Impact factor: 4.379

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Authors:  Thomas Loerting; Violeta Fuentes-Landete; Philip H Handle; Markus Seidl; Katrin Amann-Winkel; Catalin Gainaru; Roland Böhmer
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  9 in total

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