Size dependence of dynamic fluctuations in liquid and supercooled water
Abstract
We study the evolution of dynamic fluctuations averaged over different space lengths and time scales to characterize spatially and temporally heterogeneous behavior of TIP4P/2005 water in liquid and supercooled states. Analysing a million particle simulated system we provide evidence of the existence, upon supercooling, of a significant enhancement of spatially localized dynamic fluctuations stemming from regions of correlated mobile molecules. We show that both the magnitude of the departure from the value expected for the system-size dependence of an uncorrelated system and the molecular size at which such trivial regime is finally recovered clearly increase upon supercooling. This provides a means to estimate an upper limit to the maximum length scale of influence of the regions of correlated mobile molecules. Notably, such upper limit grows two orders of magnitude on cooling, reaching a value corresponding to a few thousand molecules at the lowest investigated temperature.
Keywords
Cite
@article{arxiv.1812.07073,
title = {Size dependence of dynamic fluctuations in liquid and supercooled water},
author = {Joan Manuel Montes de Oca and Sebastián R. Accordino and Gustavo A. Appignanesi and Philip H. Handle and Francesco Sciortino},
journal= {arXiv preprint arXiv:1812.07073},
year = {2019}
}