Water Dynamics; Fluctuation, Phase Transitions and Chemical Reactions
Iwao Ohmine
Institute for Molecular Science, Okazaki, Aich, Japon.
ohmine@ims.ac.jp
Lundi 13 Mai 2013, 11h00
bibliothèque LCT, tour 12 - 13, 4e étage
Water is the most ubiquitous substance on earth and known to have anomalous properties, arisen from the characteristic structure and dynamics of hydrogen bond network in water. In this review, we focus on the dynamical aspects of water. Water dynamics is strongly controlled by the hydrogen bond network; there exist intermittent collective molecular motions associated with the rearrangement of the hydrogen bond network and concomitant fluctuation and relaxation in water.
Following aspects of the water dynamics will be discussed; (1) Intermittent collective motions and fluctuations with hydrogen bond network arrangements in water, (2) Water properties in low and high temperatures, (3) Molecular mechanism of freezing of water and melting of ice, and (4) Role of water in biological systems. Special emphasis will be made on the mechanism of ice melting, and the low temperature behavior of water dynamics in the talk.