Water-mediated ordering of nanoparticles in electric field

Abstract

Interfacial polar molecules feature a strongly anisotropic response to applied electric field, favoring dipole orientations parallel to the interface. In water, in particular, this effect combines with generic orientational preferences induced by spatial asymmetry of water hydrogen bonding under confined geometry, which may give rise to a Janus interface. The two effects manifest themselves in considerable dependence of water polarization on both the field direction relative to the interface, and the polarity (sign) of the field. Using molecular simulations, we demonstrate strong field-induced orientational forces acting on apolar surfaces through water mediation. At a field strength comparable to electric fields around a DNA polyion, the torques we predict to act on an adjacent nanoparticle are sufficient to overcome thermal fluctuations. These torques can align a particle with surface as small as 1 nm2. The mechanism can support electrically controlled ordering of suspended nanoparticles as a means of tuning their properties, and can find application in electro-nanomechanical devices.

19 pages, 10 figures, article accepted for publication in Faraday Discussions

References in corpus (3)

• Effect of pressure on the phase behavior and structure of water confined between nanoscale hydrophobic and hydrophilic plates
• Electric field-controlled water permeation coupled to ion transport through a nanopore
• Field exposed water in a nanopore: liquid or vapour?

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