Tag Archive for 'Phase'

Ionocaloric refrigeration would eliminate the risk of greenhouse gases escaping into the atmosphere by replacing them with solid and liquid components. Image credit: Jenny Nuss / Berkeley Lab.

Ionocaloric Cooling: Novel Method of Refrigeration Developed

Jan 4, 2023 by News Staff

Solid- or liquid-state cooling strategies often rely on caloric effects in which materials are taken through some sort of phase change. Researchers from...

Kapil et al. describe the phase behavior of monolayer-confined water by calculating its pressure-temperature phase diagram: (a-g) the pressure-temperature phase diagram of monolayer water was calculated using an machine learning potential that delivers first-principles accuracy; the solid and dashed lines indicate first-order and continuous phase transitions, respectively; the gray regions indicate the statistical uncertainty for solid-solid phase transitions and, for the other transitions, the uncertainties arising from studying a finite number of thermodynamic states; the diagonally hatched area indicates the region in which square and flat-rhombic phases are near degenerate; diagrams of the hexagonal (a), pentagonal (b), square (c), flat-rhombic (d), hexatic (e), superionic (f) and liquid (g) phases are shown with oxygen atoms in red, hydrogen atoms in gray and hydrogen bonds shown by blue lines. Image credit: Kapil et al., doi: 10.1038/s41586-022-05036-x.

Monolayer-Confined Water Acts Like Neither Liquid Nor Solid, Scientists Say

Sep 14, 2022 by News Staff

Water in a one-molecule layer acts like neither a liquid nor a solid, and becomes highly conductive at high pressures, according to a new paper published...

Characterization of the liquid-liquid phase transition in colloidal (top) and molecular water (bottom) by identifying links and knots. LDL - low-density liquid; HDL - high-density liquid. Image credit: Neophytou et al., doi: 10.1038/s41567-022-01698-6.

New Research Sheds More Light on Liquid-Liquid Phase Transition in Deeply Supercooled Water

Aug 22, 2022 by News Staff

The new evidence represents a significant step forward in confirming the idea of a liquid-liquid phase transition first proposed in 1992. Characterization...

Hydrogen atoms diffuse easily between the superionic and the liquid phases. The liquid-fcc superionic interface of a water system with 20,736 atoms at 100 GPa and 3,250 K (on the melting curve) is shown. The oxygen atoms are red and the hydrogen atoms are white. The yellow, green and blue lines show the trajectories of three hydrogen atoms during a 75 ps molecular dynamics simulation run. Image credit: Cheng et al., doi: 10.1038/s41567-021-01334-9.

Physicists Study Superionic Water’s Phase Behaviors

Sep 28, 2021 by News Staff

Using machine learning, a team of physicists at Lawrence Livermore National Laboratory has studied the phase behaviors of superionic water — a phase...