Water modeled as an intermediate element between carbon and silicon.
By Valeria Molinero, Emily B. Moore. Journal of Physical Chemistry B, 2008
1,019 citations recorded by the source corpus.
Water and silicon are chemically dissimilar substances with common physical properties. Their liquids display a temperature of maximum density, increased diffusivity on compression, and they form tetrahedral crystals and tetrahedral amorphous phases. The common feature to water, silicon, and carbon is the formation of tetrahedrally coordinated units. We exploit these similarities to develop a coarse-grained model of water (mW) that is essentially an atom with tetrahedrality intermediate between carbon and silicon. mW mimics the hydrogen-bonded structure of water through the introduction of a nonbond angular dependent term that encourages tetrahedral configurations. The model departs from the prevailing paradigm in water modeling: the use of long-ranged forces (electrostatics) to produce short-ranged (hydrogen-bonded) structure. mW has only short-range interactions yet it reproduces the energetics, density and structure of liquid water, and its anomalies and phase transitions with comparable or better accuracy than the most popular atomistic models of water, at less than 1% of the computational cost. We conclude that it is not the nature of the interactions but the connectivity of the molecules that determines the structural and thermodynamic behavior of water. The speedup in computing time provided by mW makes it particularly useful for the study of slow processes in deeply supercooled water, the mechanism of ice nucleation, wetting-drying transitions, and as a realistic water model for coarse-grained simulations of biomolecules and complex materials.
Subfields: Atmospheric Science, Condensed Matter Physics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/2276a8d10df612633a6a933520cd361b0434d031
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Citations in the corpus
- The power of coarse graining in biomolecular simulations (2013, methodology): “42,43 For instance, the Martini model uses an implicit dielectric constant ε = 15.”
- The role of local structure in dynamical arrest (2014, methodology): “High pressure liquid water has a structure similar to a simple liquid as shown in both simulations [364] and experiment [496].”
- Self-diffusion coefficient of bulk and confined water: a critical review of classical molecular simulation studies (2018, background): “[180], mW (green stars) reported by Molinero and Moore [130]; and Model 1 (black triangles), Model 2 (cyan crosses) and MARTINI W (magenta diamonds) reported by Fuhrmans et al.”