Unusual Dynamics of Tetrahedral Liquids Caused by the Competition between Dynamic and Chemical Heterogeneity

ORAL

Abstract

Tetrahedral liquids are intriguing: they don’t pack the entire space, and they form networks of a variety of structures. As a result, tetrahedral liquids often exhibit fascinating phase behaviors like water. In this talk, I will discuss our recent neutron spin echo measurements of the collective dynamics as well as molecular dynamics (MD) simulations, using a neural network forcefield (NNFF), of another prototypical AX2-type tetrahedral network liquid, ZnCl2. We observed an unusual non-monotonic temperature-dependence of the stretching exponent β as the liquid is supercooled. Further simulations revealed that this unusual dynamic behavior is due to the competition between dynamic and chemical heterogeneity. This discovery may provide new insight into the unusual thermodynamic properties of tetrahedral liquids.

* This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Award Number DE-SC0024447

Publication: Unusual Dynamics of Tetrahedral Liquids Caused by the Competition between Dynamic and Chemical Heterogeneity

Presenters

  • Lucas Trojanowski

    University of Michigan Ann-Arbor

Authors

  • Lucas Trojanowski

    University of Michigan Ann-Arbor

  • Shao-Chun Lee

    University of Illinois Urbana-Champaign

  • Peter Falus

    Institut Laue-Langevin

  • Juscelino B Leao

    National Institute of Standards and Technology

  • Antonio Faraone

    National Institute of Standards and Technology

  • Yang (YZ) Zhang

    University of Michigan Ann-Arbor