標題: Formation of "Nano-Ice" and Density Maximum Anomaly of Water
作者: Okajima, Hajime
Ando, Masahiro
Hamaguchi, Hiro-o
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
關鍵字: Water;Nano-ice;Raman spectroscopy
公開日期: 1-Jun-2018
摘要: Water is still mysterious despite intensive and extensive studies over the years. Anomalous behavior of water as a liquid is yet to be fully comprehended. Here we show that the most generally known anomaly of water, the density maximum anomaly, is well accounted for by the formation of nanometer-size ice crystallite at low temperatures. We show spectroscopically that, in cold and super-cooled water, this nanometer-size ice crystallite is formed and coexists with the other two forms of water. Multivariate hyperspectral analysis of 140 temperature dependent Raman spectra in the range of (_)23 similar to 45 degrees C determines the three distinct vibrational spectra of the three forms of water and their fractions at different temperatures. Simulation based on the determined fractions successfully reproduces the temperature dependence of density with a maximum at the right temperature. The mystery of the density maximum of water has thus been given an unequivocal solution. The nanometer-size ice crystallite might well be called "nano-ice".
URI: http://dx.doi.org/10.1246/bcsj.20180052
http://hdl.handle.net/11536/145126
ISSN: 0009-2673
DOI: 10.1246/bcsj.20180052
期刊: BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
Volume: 91
起始頁: 991
結束頁: 997
Appears in Collections:Articles