Cooperative Origin of Low-Density Domains in Liquid Water

Details Cooperative Origin of Low-Density Domains in Liquid Water Cooperative Origin of Low-Density Domains in Liquid Water

2002-06-18

arxiv.org/abs/cond-mat/0206354v1

Physics

Condensed Matter

Statistical Mechanics

16 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.89.215503

We study the size of clusters formed by water molecules possessing large enough tetrahedrality with respect to their nearest neighbors. Using Monte Carlo simulation of the SPC/E model of water, together with a geometric analysis based on Voronoi tessellation, we find that regions of lower density than the bulk are formed by accretion of molecules into clusters exceeding a minimum size. Clusters are predominantly linear objects and become less compact as they grow until they reach a size beyond which further accretion is not accompanied by a density decrease. The results suggest that the formation of "ice-like" regions in liquid water is cooperative.

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