Dynamic response of liquid water to an external static electric field at T=250 K

摘要

The effect of uniform and uniaxial d.c. electric field in the range between 0.15 x 10(7) and 1.5 x 10(7) V/cm on supercooled water at T = 250 K is examined by means of molecular dynamics simulations. As in clusters, a change of structure, (not the crystalline one) is identified at a transition field of the order of 1.0 x 10(7) V/cm which change is also accompanied by a significant and abrupt slowing of the reorientational and structural relaxation. The electric field induced spatial anisotropy, due to the near alignment of the molecular dipoles along the field direction, was found to significantly affect the dynamics along and perpendicular to the field vector, resulting in stronger hydrogen bonds and in slower diffusion along the field direction. (C) 2003 Elsevier B.V. All rights reserved.