Anisotropic structure and dynamics of water under static electric fields

Area of Science:

• Physical Chemistry
• Computational Chemistry
• Materials Science

Background:

• Water's unique properties are crucial in various scientific domains.
• Understanding water's response to external stimuli like electric fields is essential.
• Molecular dynamics simulations provide insights into microscopic behavior.

Purpose of the Study:

• To investigate the structural and dynamic alterations in water under static electric fields.
• To analyze changes in hydrogen bond kinetics, reorientation, and translation of water molecules.
• To compare the influence of electric fields on polarizable versus nonpolarizable water models.

Main Methods:

• Utilizing molecular dynamics (MD) simulations.
• Applying a range of static external electric fields to water.
• Monitoring hydrogen bond kinetics, molecular reorientation, and translational motion.

Main Results:

• Electric fields reduce the speed of water molecule translation and rotation.
• Dipolar alignment leads to structural and dynamic anisotropies.
• Polarizable water models exhibit more pronounced electric field effects, including slower hydrogen bond switching and reduced mobility.

Conclusions:

• Static electric fields significantly influence water's hydrogen bond network and dynamics.
• The choice of water model (polarizable vs. nonpolarizable) affects the magnitude of electric field responses.
• Anisotropic behavior arises from dipolar alignment, even with minor average structural changes.