Crossref journal-article
AIP Publishing
The Journal of Chemical Physics (317)
Abstract

Using an ultrafast scanning microcalorimetry apparatus capable of heating rates in excess of 105K∕s, we have conducted the first direct measurements of thermodynamic properties of pure and doped amorphous solid water (also referred to as low density amorphous ice) in the temperature range from 120to230K. Ultrafast microcalorimetry experiments show that the heat capacity of pure amorphous solid water (ASW) remains indistinguishable from that of crystalline ice during rapid heating up to a temperature of 205±5K where the ASW undergoes rapid crystallization. Based on these observations, we conclude that the enthalpy relaxation time in pure ASW must be greater than 10−5s at 205K. We argue that this result contradicts the assignment of glass transition temperature to 135K and that ASW may undergo fragile to strong transition at temperatures greater than 205K. Unlike pure ASW, we observe an approximately twofold rise in heat capacity of CH3COOH doped ASW at 177±5K. We discuss results of past studies taking into account possible influence of impurities and confinement on physical properties of ASW.

Bibliography

Chonde, M., Brindza, M., & Sadtchenko, V. (2006). Glass transition in pure and doped amorphous solid water: An ultrafast microcalorimetry study. The Journal of Chemical Physics, 125(9).

Authors 3
  1. M. Chonde (first)
  2. M. Brindza (additional)
  3. Vlad Sadtchenko (additional)
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Dates
Type When
Created 18 years, 11 months ago (Sept. 2, 2006, 1:56 a.m.)
Deposited 2 years, 2 months ago (June 26, 2023, midnight)
Indexed 4 weeks, 2 days ago (July 30, 2025, 6:47 a.m.)
Issued 18 years, 11 months ago (Sept. 1, 2006)
Published 18 years, 11 months ago (Sept. 1, 2006)
Published Online 18 years, 11 months ago (Sept. 1, 2006)
Published Print 18 years, 11 months ago (Sept. 7, 2006)
Funders 0

None

@article{Chonde_2006, title={Glass transition in pure and doped amorphous solid water: An ultrafast microcalorimetry study}, volume={125}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.2338524}, DOI={10.1063/1.2338524}, number={9}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Chonde, M. and Brindza, M. and Sadtchenko, Vlad}, year={2006}, month=sep }