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Phase Behavior of Supercooled and Glassy Water (from 1984 to today)

Phase Behavior of Supercooled and Glassy Water (from 1984 to today)

When Oct 28, 2020
from 12:45 pm to 02:00 pm
Speaker Nicolas Giovambattista PhD.
Speaker Information Nicolas Giovambattista is a Professor of Physics and Chair of the Department of Physics at Brooklyn College, City University of New York. He studied Electronic Engineering and Physics at the National University of Mar del Plata, Buenos Aires, Argentina, and earned his Physics PhD degree from Boston University. Nicolas spent four years as a postdoctoral researcher at the Biological and Chemical Engineering Department at Princeton University after which he joined Brooklyn College. He is broadly interested in low-temperature liquid and glassy systems, particularly, water and aqueous solutions. Current research interests include the phase behavior of glassy water and its role in cryopreservation, nanoconfined water and water-mediated interactions, and nuclear quantum effects on water at low temperatures; theoretical/computational description of quantum liquids at low temperature, quantum glasses.
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Most substances exist in a single liquid state and hence, they can form a single glass or amorphous solid state upon rapid cooling.  Experiments and computer simulations indicate that water is different, exhibiting two liquid states and two associated glassy states.  The resulting phase diagram of supercooled and glassy water is complex and includes a first-order liquid-liquid phase transition (LLPT) that ends at a novel liquid-liquid critical point.  In the first part of this talk, I will describe key experiments dating back to the 1980's and enlightening computer simulations that lead to the so-called LLPT scenario for water.  I will then present extensive results from computational studies of liquid/glassy water that provide a simple thermodynamic/statistical mechanics interpretation of these phenomena.  I will conclude with a discussion of a recent experimental/computational study showing that water, indeed, exists in two liquid states.  If times allows it, I will discuss briefly a potential application that takes advantage of water complex phase behavior in the supercooled liquid and glassy states.