High-temperature dynamic behavior in bulk liquid water: A molecular dynamics simulation study using the OPC and TIP4P-Ew potentials
Andrea Gabrieli , Marco Sant , Saeed Izadi , Parviz Seifpanahi Shabane , Alexey V. Onufriev , Giuseppe B. Suffritti
Front. Phys. ›› 2018, Vol. 13 ›› Issue (1) : 138203
High-temperature dynamic behavior in bulk liquid water: A molecular dynamics simulation study using the OPC and TIP4P-Ew potentials
Classical molecular dynamics simulations were performed to study the high-temperature (above 300 K) dynamic behavior of bulk water, specifically the behavior of the diffusion coefficient, hydrogen bond, and nearest-neighbor lifetimes. Two water potentials were compared: the recently proposed “globally optimal” point charge (OPC) model and the well-known TIP4P-Ew model. By considering the Arrhenius plots of the computed inverse diffusion coefficient and rotational relaxation constants, a crossover from Vogel–Fulcher–Tammann behavior to a linear trend with increasing temperature was detected atT*≈309 and T*≈285 K for the OPC and TIP4P-Ew models, respectively. Experimentally, the crossover point was previously observed atT*≈315±5 K. We also verified that for the coefficient of thermal expansion αP (T, P), the isobaric αP(T) curves cross at about the same T* as in the experiment. The lifetimes of water hydrogen bonds and of the nearest neighbors were evaluated and were found to cross nearT*, where the lifetimes are about 1 ps. For T<T*, hydrogen bonds persist longer than nearest neighbors, suggesting that the hydrogen bonding network dominates the water structure at T<T*, whereas for T>T*, water behaves more like a simple liquid. The fact that T* falls within the biologically relevant temperature range is a strong motivation for further analysis of the phenomenon and its possible consequences for biomolecular systems.
dynamic crossover / molecular dynamics / bulk liquid water / water models
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Higher Education Press and Springer-Verlag Berlin Heidelberg
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