Bair Damdinov

Work: Acoustical investigation of shear viscoelastic properties of liquids. Buryat Scientific Center of RAS.

Date of birth:   October 12, 1972.

Place of birth: Ulan-Ude, Buryatia, Russia.

Education: 1994, Graduate from Buryat State University, Ulan-Ude. 1996-2000: PhD Student at Buryat State University. November, 2000: PhD in acoustics, N. N. Andreev's Acoustical institute, Moscow, Russia.

E-mail: dababa@rambler.ru.

Main results: Investigation of dynamic properties of liquids is an actual problem of condensed matter physics. There are many materials which main characteristics are rheological properties. Such are lubricants, polymers, oils. Experimental research is carried out by acoustical methods. In this work an experimental procedure for investigation of shear visco-elastic properties of liquids by acoustical resonance method has been modified to 40 kHz. An experimental procedure for investigation of dynamical properties at 40 kHz has been worked out. Experimental research of dynamical shear properties of liquids was conducted in order to study of the low frequency visco-elastic relaxation in liquids. Experiments with different organic liquids (glycol's, oils, acids, alcohol's, polymer solutions) have been carried out. It was shown that all tested liquids possess measurable values of the storage G' and loss G'' moduli at experimental frequency. Visco-elastic parameters of liquids are measured under different conditions with the thickness of the liquid interlayer being much less than the shear wavelength. It was shown that shear viscosity and storage modulus decrease with shear deformation increasing. The hypothesis about a micro inhomogeneous structure of liquids has been suggested. It is assumed that in liquids there are fluctuation clusters - dynamic ordered volumes. The mechanism of low-frequency visco-elastic relaxation in liquids is probably connected to breaking of the cluster. The energy of activation of this relaxation has been estimated.

Main publications:

1. Ochirova E.R., Badmaev B.B., Ivanova M.N., Damdinov B.B. Investigation of temperature dependence of low-frequency complex shear modulus of liquids // Abstracts of II Intern.Symp."Adv. in Strustural and Geterogenius continua", 1995, Moscow, p.24.
2. Dembelova T.S., Damdinov B.B., Badmaev B.B., Budaev O.R. Shear waves in liquids // Proceedings of VI session of the Russian Acoustical Society, 1997, Moscow, p.31-34.
3. Damdinov B.B., Badmaev B.B., Budaev O.R., Ivanova M.N. Low-frequency shear elasticity of liquids // Proceedings of VI session of the Russian Acoustical Society, 1997, Moscow, p.35-38.
4. Badmaev B.B., Bal'zhinov S.A., Damdinov B.B., Dembelova T.S. Shear elasticity of liquids and its dependence on frequency // Proceedings of X session of the Russian Acoustical Society, 2000, Moscow,v.1, p.40-43.
5. Damdinov B.B., Laidabon Ch.S., Badmaev B.B. Dynamical properties of impregnate solutions.// Proceedings of II Congress of the Slovenian Acoustical Society, 2000, Ljublyana, p.205-208.
6. Badmaev B.B., Damdinov B.B. Study of the viscoelastic properties of organic liquids by an acoustic method // Acoustical Physics, 2001, v.47, N4, p.487-489.