FİZİKA PROBLEMLƏRİ İNSTİTUTU

NEWS

STRUCTURE

STAFF

SCIENTIFIC COUNCIL

CONFERENCES

RESEARCH

HONORARY


PHYSICS OF BIOLOGICAL SYSTEMS

Masimov E.A., H.F. Abbasov, G.S. Gasanov, Pashayev B.G.

The influence of polyethylene glycol on the structure of water studied by dielectrometric and viscosimetric methods and it was established that increasing the concentration of polyethylene glycol structures water, increase the molecular weight has no effect on the structure, with increasing temperature the water structure is destroyed.

Abbasov H.F., Imamaliyev A.R.

The influence of polar and dispersive parts of the surface anchoring energy on the threshold voltage and switching time of electro-optical effects arising in the surface stabilized ferroelectric liquid crystal has been studied.

Masimov E.A., H.F. Abbasov, Budagov K.M.


The influence of lidocaine hydrochloride on the structure of water was studied by low-frequency dielectric spectroscopy method. By construction Cole - Cole diagrams it was found that under the influence of lidocaine hydrochloride the cluster size growing, lidocaine hydrochloride structures water.

 

G.M. Bayramov, A.R. Imamaliyev

The new method and systems of making of colloid-liquid crystal composites on the base of polymers are proposed. Some electro-optical characteristics of obtained systems has been measured.

 

K.M.Budagov, G.M.Bayramov

The study of electrical and photovoltaic properties of the silicon-liquid crystal (LC) contact shows that, depending on the Fermi levels position of the at the interface of silicon-LCD, the formation of depleted and enriched layers of the silicon are possible. In the presence of "surface states" flint Fermi level "fixed" on the surface and electron-ion exchange does not alter the position of the Fermi levels on the silicon surface. In this case, the contact potential difference applies to the entire Helmholz layer and ion diffusion layer. Conversely, when the boundaries of the zones are enshrined at the surface, the position of all electrical surface levels and, in particular, the boundaries of the energy bands of EC and EV are constant with respect to reduced energy levels in the LC.

E.A. Masimov, B.G. Pashayev, H.Sh. Hasanov, N.A. Ibrahimov

Dependences of activation parameters of viscous flow on concentration in water-ethanol-carbamide systems at different temperatures were investigated. The obtained results show that ethanol with molar concentration of to 0.15 parts has structure-forming and then destructive effect on water, while carbamide destructs the water structure starting from low concentrations. Addition of carbamide into water-ethanol system does not affect the inversion point.

 

E.A. Masimov, B.G. Pashayev, H.Sh. Hasanov, S.V. Huseynova

The activation parameters of viscous flow (,  və ) in a consentration range of 0-5% and temperature 293.15-333.15 K for water solution of PEQ with molecular weight 6000, 15000, 20000, 40000 and baen determined. The structural properties of the solution was analyesed. From theese results we can say that the structural changes in PEQ-water systems in considered temperature and consentration range are very small and conformation of PEQ in solution is a deformed coil.

 

E.A. Masimov, B.G. Pashayev, H.Sh. Hasanov

The dynamic viscosity and density of etilpropionate has been studied at the temperature range from 300 K to 500 K and pressure range from 5 MPa to 50 MPa. The activation parameters and thermal coefficients of viscous flow are calculated on the basis of obtained date. The obtained results shows that isobars in dependences , , and and isotherms in dependences , , and intersect each other at some points.


B.G. Pashayev, H.Sh. Hasanov, S.I. Musayeva

In this paper, we calculated the activation parameters of viscous flow, the thermal coefficient of volume expansion and isothermal compression ratios in the range of 1.09-49.14 MPa pressure and 288.95-567.35 K temperature for n-amil alcohol, and analyzed changes in these parameters on temperature and pressure. Obtained results show that, in dependences , ,  and  isobars intersect at one point. Respectively, , ,  and .

 

Masimiv E.A., Imamaliyev A.R.

The investigation of the agar gel by the method of differential thermal analysis has been carried out. The melting point of gel, as well as the enthalpy of the phase transitions are determined. Using differential scanning calorimeter one have showed that the silver ions strongly affect on thermal properties of agar gel, especially on the enthalpy of sol-gel transition.
Using rotational viscometer, the effect of inorganic salts (NaCl, KCl, CaCl2) on the agar gel flow curve has been studied. Analysis of this curve shows that: 1) the flow have threshold character  2) the flow curve consists of two straight lines with different slopes. Influence of salts can be summarized as follows: a) NaCl decreases the gel strength (yield stress) and increases the viscosity; b) KCl reduces the gel strength and viscosity at low concentrations, but increases these quantities at high concentrations; c) at all concentrations CaCl2 significantly increases the concentration but sharply increases the viscosity of the gel. These results show that by using of inorganic additives the rheological properties of the gel can be controlled within certain range.

 

 

 

 

Bookmark and Share
© Bakı Dövlət Universiteti