Nonlinear vibrational spectroscopy of water structures utilizing laser-induced phase transition phenomena in liquid water

2003 ◽  
Vol 74 (1) ◽  
pp. 456-458 ◽  
Author(s):  
Hiroharu Yui ◽  
Tsuguo Sawada
Keyword(s):  
Phase Transition ◽  
Vibrational Spectroscopy ◽  
Liquid Water

Time-Resolved Infrared Vibrational Spectroscopy of the Photoinduced Phase Transition of Pd(dmit)2 Salts Having Different Orders of Phase Transition

2013 ◽  
Vol 117 (25) ◽  
pp. 13187-13196 ◽  
Author(s):  
Naoto Fukazawa ◽  
Takahiro Tanaka ◽  
Tadahiko Ishikawa ◽  
Yoichi Okimoto ◽  
Shin-ya Koshihara ◽  
...  
Keyword(s):  
Phase Transition ◽  
Vibrational Spectroscopy ◽  
Time Resolved

scholarly journals Phase transitions and critical phenomena of ice under high pressure

2014 ◽  
Vol 70 (a1) ◽  
pp. C894-C894
Author(s):  
Masakazu Matsumoto ◽  
Kazuhiro Himoto ◽  
Kenji Mochizuki ◽  
Hideki Tanaka
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Phase Transitions ◽  
Phase Boundary ◽  
Liquid Water ◽  
Tricritical Point ◽  
Melting Curve ◽  
Md Simulations ◽  
Free Energy Calculations ◽  
Lattice Points

Water distributes ubiquitously among the solar system and outer space in a wide variety of solid forms, i.e. more than ten kinds of crystalline ice, two types of amorphous ice, and clathrate hydrates. These polymorphs often play crucial roles in the planetary geology. Diversity of the stable ices and hydrates also suggests the existence of the various kinds of stable and metastable phases yet to be discovered [1]. Computer simulations and the theoretical treatments are useful to explore them. In this talk, we introduce the phase transitions of ice VII, which is one of the highest-pressure ice phases. The melting curve of ice VII to high-pressure liquid water has not been settled by experiments. We have proposed the intervention of a plastic phase of ice (plastic ice) between ice VII and liquid water, based on molecular dynamics (MD) simulations and the free energy calculations [2], which enables to account for large gaps among the various experimental curves of ice VII. In plastic ice, the water molecules are fixed at the lattice points, while they rotate freely. Interestingly, our additional survey by large-scale MD simulations elucidates that the phase transition between ice VII and plastic ice is first-order at low pressure as it was already predicted, while it is found to be second-order at higher pressures, where a tricritical point joins these phase boundaries together [3]. The critical fluctuations may give a clue for determining the phase boundary experimentally. We also argue about the phase transition dynamics of liquid water to ice VII at their direct phase boundary where metastable plastic ice phase plays an important role.

Is seven the minimum number of water molecules per ion pair for assured biological activity in ionic liquid–water mixtures?

2015 ◽  
Vol 17 (22) ◽  
pp. 14454-14460 ◽  
Author(s):  
Hiroyuki Ohno ◽  
Kyoko Fujita ◽  
Yuki Kohno
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Biological Activity ◽  
Water Molecule ◽  
Liquid Water ◽  
Ion Pair ◽  
Water Molecules ◽  
Minimum Number ◽  
Transition Behaviour

The biological activity and phase transition behaviour of IL–water mixtures, called hydrated ILs, were found to change non-linearly at a water molecule to ion pair ratio of around 7 : 1.

Probing Crystal Growth of ε- and α-CL-20 Polymorphs via Metastable Phase Transition Using Microscopy and Vibrational Spectroscopy

2014 ◽  
Vol 14 (10) ◽  
pp. 5053-5063 ◽  
Author(s):  
Mrinal Ghosh ◽  
V. Venkatesan ◽  
Snehal Mandave ◽  
Shaibal Banerjee ◽  
Nirmala Sikder ◽  
...  
Keyword(s):  
Phase Transition ◽  
Crystal Growth ◽  
Vibrational Spectroscopy ◽  
Metastable Phase

scholarly journals High-pressure X-ray diffraction and vibrational spectroscopy of polyethylene: Evidence for a structural phase transition

2020 ◽  
Vol 111 ◽  
pp. 103173
Author(s):  
D.M. Dattelbaum ◽  
E.D. Emmons ◽  
A.M. Covington ◽  
L.L. Stevens ◽  
N. Velisavljevic ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Vibrational Spectroscopy ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
X Ray Diffraction ◽  
X Ray
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