Tuesday, July 16, 2013

1307.3611 (R. G. Pereyra et al.)

On the relation between hydrogen bonds, tetrahedral order and molecular
mobility in model water

R. G. Pereyra, A. Bermudez di Lorenzo, D. C. Malaspina, M. A. Carignano
We studied by molecular dynamics simulations the relation existing between the lifetime of hydrogen bonds, the tetrahedral order and the diffusion coefficient of model water. We tested four different models: SPC/E, TIP4P-Ew, TIP5P-Ew and Six-site, these last two having sites explicitly resembling the water lone pairs. While all the models perform reasonably well at ambient conditions, their behavior is significantly different for temperatures below 270 K. The models with explicit lone-pairs have a longer hydrogen bond lifetime, a better tetrahedral order and a smaller diffusion coefficient than the models without them.
View original: http://arxiv.org/abs/1307.3611

No comments:

Post a Comment