Seminar: Dr Kenji Mochizuki - Study for Water, Ice and Aqueous solutions

Friday, 24 March 2017 - 11:00am – Friday, 24 March 2017 - 12:00pm  |  CLB1

Speaker: Dr Kenji Mochizuki

Water is ubiquitous on earth and many phenomena around us are designed and adjusted to work best in water. For example, proteins fold into a native structure and exhibit its functions in water, not in oil. Water itself is also an intriguing substance in physical chemistry. The three-dimensional hydrogen bond network yields anomalous properties, such as density maximum at 4oC. Using molecular dynamics simulations, I have been working on the molecular mechanism of phase transitions of water and ice. Upon heating, ice melts into liquid water. Although in practice this process tends to be heterogeneous, it can occur homogeneously inside bulk ice. My work introduced a new order parameter to define “disorder” and found that the melting occurs stepwise [1]. Understanding nano-confined water, which properties are much different from bulk water, is also important for material science and biology. I explored the phase diagram of water in carbon nanotubes and provided evidence to support solid-liquid critical phenomena, which have not been observed in any substance [2]. In the presentation, I will also introduce the influence of hydration-shell on the structural stability of aqueous polymers [3] as well as my future work.

[1] K. Mochizuki, M. Matsumoto, I. Ohmine, Nature, 498, 350-354 (2013)

[2] K. Mochizuki, K. Koga, Proc. Natl. Acad. Sci. USA, 112, 8221-8226 (2015)

[3] K. Mochizuki, S. R. Pattenaude, D. Ben-Amotz, J. Am. Chem. Soc., 138, 9045-9048 (2016)