Hydrophobic Surface Enhances Electrostatic Interaction in Water

Takato Sato, Tohru Sasaki, Jun Ohnuki, Koji Umezawa, and Mitsunori Takano
Phys. Rev. Lett. 121, 206002 – Published 15 November 2018
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Abstract

A high dielectric constant is one of the peculiar properties of liquid water, indicating that the electrostatic interaction between charged substances is largely reduced in water. We show by molecular dynamics simulation that the dielectric constant of water is decreased near the hydrophobic surface. We further show that the decrease in the dielectric constant is due to both the decreased water density and the reduced water dipole correlation in the direction perpendicular to the surface. We finally demonstrate that electrostatic interaction in water is actually strengthened near the hydrophobic surface.

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  • Received 17 August 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.206002

© 2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Takato Sato1, Tohru Sasaki1, Jun Ohnuki1, Koji Umezawa2, and Mitsunori Takano1,*

  • 1Department of Pure and Applied Physics, Waseda University, Ohkubo 3-4-1, Shinjuku-Ku, Tokyo 169-8555, Japan
  • 2Department of Biomedical Engineering/Institute for Biomedical Sciences, Shinshu University, 8304 Minami-minowa, Kami-ina, Nagano, 399-4598, Japan

  • *Corresponding author. mtkn@waseda.jp.

Comments & Replies

Comment on “Hydrophobic Surface Enhances Electrostatic Interaction in Water”

Philip Loche, Amanuel Wolde-Kidan, Alexander Schlaich, Douwe Jan Bonthuis, and Roland R. Netz
Phys. Rev. Lett. 123, 049601 (2019)

Ohnuki et al. Reply:

Jun Ohnuki, Takato Sato, Tohru Sasaki, Koji Umezawa, and Mitsunori Takano
Phys. Rev. Lett. 123, 049602 (2019)

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Issue

Vol. 121, Iss. 20 — 16 November 2018

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