Density hysteresis of heavy water confined in a nanoporous silica matrix
Name
Zhang-2011-June-Density hysteresis o.pdf
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Author(s)
Faraone, Antonio
Kamitakahara, William A.
Liu, Kao-Hsiang
Mou, Chung-Yuan
Leão, Juscelino B.
Chang, Sung
Zhang, Yang
Chen, Sow-Hsin
Date Issued
June 2011
Journal
Proceedings of the National Academy of Sciences
Publisher
Proceedings of the National Academy of Sciences (PNAS)
Citation
Zhang, Y. et al. “Density hysteresis of heavy water confined in a nanoporous silica matrix.” Proceedings of the National Academy of Sciences 108.30 (2011): 12206-12211. Web. 2 Feb. 2012.
Version
Final published version
Abstract
A neutron scattering technique was developed to measure the density of heavy water confined in a nanoporous silica matrix in a temperature-pressure range, from 300 to 130 K and from 1 to 2,900 bars, where bulk water will crystalize. We observed a prominent hysteresis phenomenon in the measured density profiles between warming and cooling scans above 1,000 bars. We interpret this hysteresis phenomenon as support (although not a proof) of the hypothetical existence of a first-order liquid–liquid phase transition of water that would exist in the macroscopic system if crystallization could be avoided in the relevant phase region. Moreover, the density data we obtained for the confined heavy water under these conditions are valuable to large communities in biology and earth and planetary sciences interested in phenomena in which nanometer-sized water layers are involved.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
https://doi.org/10.1073/pnas.1100238108
