polar liquid Archive

  • Effects of the surface density on the stability of surface electrostatics models

    Effects of the surface density on the stability of surface electrostatics models

    We’ve been extensively involved in developing new and testing already existing methods for continuous electrostatics problems solution. Large part of the effort is building and understanding of the so called Generalized Born models. It’s been known for quite a while that although various incarnations of...

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  • Water molecules alignments on a hydrophobic surface – I

    Water molecules alignments on a hydrophobic surface – I

    Water molecules interact strongly “using” both the long range dipole-dipole and short-range “hydrogen bonds” to form sophisticated networks. As described in our previous post, water molecules align along a hydrophobic surface and form an strongly-interacting 2d system of molecular dipoles. Normally there is no true...

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  • Water polarization and density profiles at a gas-liquid interface

    Water polarization and density profiles at a gas-liquid interface

    The true picture of the water molecules ordering next to a hydrophobic surface or a liquid-gas interface is in fact more complicated than a model. Next to the interface both the water polarization and the density should vanish. To account for the density changes we incorporated the density variations into the free energy functional. The resulting model even though only in the mean field approximation reveals spontaneous liquid polarization at the liquid boundary. The spontaneous polarization of the liquid is the consequence of the dipole-dipole interactions and effectively makes the liquid interface behave as a ferro-electric film.

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  • Ferro-electric phase transition in a polar liquid and the nature of \lambda-transition in supercooled water

    Ferro-electric phase transition in a polar liquid and the nature of \lambda-transition in supercooled water

    P.O. Fedichev, L.I. Menshikov (Submitted on 7 Aug 2008 (v1), last revised 20 Dec 2009 (this version, v3)) We develop a series of approximations to calculate free energy of a polar liquid. We show that long range nature of dipole interactions between the molecules leads...

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  • Phospholipid membranes repulsion at nm-distances explained within a continuous water model

    Phospholipid membranes repulsion at nm-distances explained within a continuous water model

    P. O. Fedichev, L.I. Menshikov (Submitted on 5 Aug 2009 (v1), last revised 14 Dec 2009 (this version, v2)) We apply recently developed phenomenological theory of polar liquids to calculate the repulsive pressure between two hydrophilic membranes at nm-distances. We find that the repulsion does...

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