Program

P.69 -- Poster, NCTP-41

Date: Wednesday, 3 August 2016

Time: 08h30 - 10h00

Simple model for dielectric constant of water at low frequencies

Tran Thi Nhan (1), Luong Thi Theu (2), Le Tuan (3), Nguyen Tri Lan (4) and Nguyen Ai Viet (4)

(1) Hanoi University of Industry, Building A2, Road 32, Tuliem North District, Hanoi, Vietnam; (2) Hanoi Pedagogical University Number 2, Xuan Hoa, Vinh Phuc, Vietnam; (3) Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Vietnam; (4) Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Hanoi, Vietnam.

Dielectric constant of liquid water still is poorly understood, in particular at low frequencies, although it is very essential in understanding the dynamics, stability and flexibility of biomolecules. Recently, the dielectric constant of water at low frequency under 1 MHz and at different temperatures was measured. They have found that there is a very special frequency called the isopermitive point where the value of dielectric constant is independent of temperature. The dielectric constant of water decreases above this point, and increases below it with increasing temperature. This point might plays the same important role in living systems like the isosbestic point in chemical reactions or Raman spectroscopy. We propose a simple theoretical model for the dielectric constant of water at low frequencies where liquid water are considered as a plasma with two charge species: ions and dipoles. Our simple model found a good agreement between the theoretical and experimental data, and could be useful for further investigation the relation processes and biological behavior of live cells around the special crossing points.

Presenter: Tran Thi Nhan