Microscopic approach for low-frequency dielectric constant of liquid water

Bài báo do nhóm tác giả: Trần Thị Nhàn- Tổ bộ môn Vật Lý- khoa Khoa học cơ bản- trường Đại Học Công nghiệp Hà Nội và PGS.TS Lê Tuấn- Đại Học Bách Khoa Hà Nội. Được đăng trên tạp chí: “Physics and Chemistry of Liquids “ ngày 03 tháng 10 năm 2019.

ABSTRACT

A theoretical model has been proposed for interpreting the dispersion of the low-frequency dielectric constant of liquid water with two separate arguments. The first argument relates to dipole orientation in the water system and the second one concerns motions of ions towards the electrodes. It reveals that the compensation between these two arguments leads to the isopermittive point, at which the water dielectric constant holds constant in the range of temperature from 301 K to 313 K. The existence of the isopermittive point is also highlighted under the view from the basis of thermodynamics. We show that the isopermittive point only exists in a narrow region of temperature. The changes in enthalpy and Gibbs free energy are estimated, using van’t Hoff equation, for the water system in the equilibrium. Our theoretical model can help in the perspective research on dynamic processes happening in live cells around the crossing point.

KEYWORDS:

Simple mode, water dielectric constant, low frequency, isopermittivity point, van’t Hoff equation

Toàn văn bài báo tải về tại đây: https://www.tandfonline.com/doi/abs/10.1080/00319104.2019.1675156?journalCode=gpch20