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Chuiko Institute of Surface Chemistry

National Academy of Sciences of Ukraine
(official site)

Department of Theoretical and Experimental Physics

 rozemb dep

 

Head of Department

Rozenbaum Victor M.

Doctor of Sciences

(Physics and Mathematics),

Professor

 

Telephone: + 380 44 422-96-19

Fax: + 380 44 424-35-67

E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

upper row: PhD V.I. Kanevskii, Prof. V. М. Rozenbaum

 lower row:  PhD О.I. Gichan, PhD Т.Е. Korochkova

 

Department staff is 24 co-workers including 3 DScs and 12 PhDs. The Department includes Laboratory of Quantum Chemistry and Chemical Physics of Nanosystems (Head of Lab, DSc V.V. Lobanov) and Laboratory of Mass Spectrometry of Surface of Nanosystems (Head of Lab DSc V.A. Pokrovskiy). From 1986, the Department researchers have published 4 books, more than 360 scientific papers; 2 doctor and 6 candidate dissertations were defended.

 

Directions of investigations

Theoretical investigation of the nonequilibrium processes at the electrode-electrolyte phase interface which are induced by dynamic instabilities. Establishment of conditions to control the nonlinear dynamics of such systems.

Simulation of light scattering on dielectric resonators and multilayer carbon nanotubes. 

Theoretical and mathematical physics of diffusion processes near the phase interface, controlled transport at nanoscale, operating mechanisms of Brownian motors.

 

Main results for the recent years

Occurrence conditions for Hopf instabilities, saddle-node bifurcations, and homoclinic instabilities have been established for a model electrocatalytic process with potential-depending adsorption/desorption of electroactive particles which is preceded by a chemical reaction in the Nernst diffusion layer on spherical, cylindrical, and plane electrode surfaces.

Approximating the scattering surface by a two-dimensional Weierstrass function within the framework of the Kirchhoff method, the average light scattering coefficient for a fractal surface has been calculated. As found, the scattering pattern substantially changes if boundary conditions are taken into account: new peaks appear, with their intensity and shape depending on the incidence angle.

A novel mechanism has been established for the occurrence of directed motion of a charged nanoparticle along a polar substrate; it arises from the fluctuations of a biased external force having a zero mean value. As shown, a temperature dependence of the particle velocity is nonmonotonic, with the maximum determined by the action region of the near-surface symmetric periodic electrostatic potential.

A number of new analytical models for Brownian motors have been suggested and necessary conditions for their high efficiency have been formulated: 1) adiabaticity of the temporal change in the potential profile (adiabatically slow or adiabatically fast); 2) the shift of the potential extrema (continuous or jump-like); 3) an efficient mechanism which rectifies nonequilibrium fluctuations at large (exceeding the thermal energy) amplitudes of the potential profile and (in the adiabatically fast mode) a certain asymmetrical shape of the profile. The results obtained provide an insight into the regularities of energy conversions at the nanoscale and in the nonequilibrium processes near the phase interface; they enable design of practically useful nanodevices.

It has been found that photoinduced dichotomic fluctuations of the electronic density distribution in an extended molecule placed in the electrostatic periodic potential of a polar substrate cause the directed motion of an ensemble of variously oriented molecules provided symmetric molecular electronic density distributions and the asymmetric substrate; on the contrary, the ensemble diffuses under the same conditions if the molecules have asymmetric electronic density distributions and the substrate is symmetric.

 

Department staff

Rozenbaum Victor M., DSc, Head of Department,

tel.:+38 (044) 4229619; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Gichan Olga I., PhD, Senior Researcher,

tel.:+38 (044) 4229697; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Kanevskii Vasilii I., PhD, Research Associate,

tel.:+38 (044) 4229697; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Korochkova Taisiya E., PhD, Senior Researcher,

tel.:+38 (044) 4229619; e- mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Laboratory of Quantum Chemistry and Chemical Physics of Nanosystems  staff

 

 

Laboratory of Mass Spectrometry of Surface of Nanosystems staff

Pokrovskiy Valeriy A., DSc, Head of Laboratory,

tel.: 380 44 424-94-62, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Gromovoy Taras Yu., PhD, Senior Researcher,

tel.: +38 (044) 4249456; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Laguta Valentin N., engineer,

tel.: 097 5604930; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Mischanchuk Boris M., leading engineer,

tel.: +38 (044) 2393316; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Mischanchuk Aleksandr V., leading engineer,

tel.: +38 (044) 2393316; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Moshkivska Nadezhda M., leading engineer,

tel.: +38 (044) 4249451; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Obrazkov Aleksandr G., leading engineer,

tel.: 0504438010; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Severinovska Olga V., PhD, Senior Researcher,

tel.: +38 (044) 4249456; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.  

 

Recent Publications

1. V.I. Kanevskiy, V.M. Rozenbaum. Light scattering by cylindrical nanoparticles: limits of applicability of the Rayleigh–Gans–Debye approximation // Optics and Spectroscopy. – 2014. – V. 117, N 2. – P. 304-307.

2. T.E. Korochkova, V.А. Mashira, N.G. Shkoda, V.M. Rozenbaum. Molecular pump functioning due to fluctuations of intramembrane potential // Eastern-European Journal of Enterprise Technologies. – 2014. – N 3/6(69). – P. 31-36.

3. V.V. Pototskaya, O.I. Gichan. Role of ohmic losses in appearance of dynamic instabilities in model electrochemical system with cylindrical electrode under potentiostatic conditions // Russ. J. Electrochem. – 2014. – V. 50, N11. – P. 1123-1134.

4. O.I. Gichan, V.V. Pototskaya. Bulk concentration and dynamic stability of a model electrochemical system with a preceding chemical reaction // Electrochim. Acta. – 2013. – V. 112. – Р. 957-966.

5. V.M. Rozenbaum, I.V. Shapochkina, T.E. Korochkova Adiabatic Brownian ratchets with the inclusion of inertia. // JETP Letters. – 2013. – V. 98, № 9. – P. 568-572.

6. M.L. Dekhtyar, V.M. Rozenbaum. Symmetry interplay in Brownian photomotors: from a single-molecule device to ensemble transport // J. Chem. Phys. – 2012. – V. 137, N 12. – P. 24306-1-6.

7 V.V. Pototskaya, O.I. Gichan. On the stability of a model electrocatalytic process with the Frumkin adsorption isotherm on a spherical electrode // Russ. J. Electrochem.. – 2012. – V. 48, N 2. – P. 171-180.

8. V.M. Rozenbaum, T.Ye. Korochkova, A.A. Chernova, M.L. Dekhtyar. Brownian motor with competing spatial and temporal asymmetry of potential energy // Phys. Rev. E. – 2011. – V. 83, N 5. – P.051120-1-10.

9. V.M. Rozenbaum Mechanical motion in nonequilibrium nanosystems / “Nanomaterials and Supramolecular Structures: Physics, Chemistry, and Applications” by Eds. A. P. Shpak and P. P. Gorbyk // Springer: London, 2009. – P.35–44.

10. V.M. Rozenbaum, А.А. Chernova. Near-surface Brownian motor with synchronously fluctuating symmetric potential and applied force // Surface Science. – 2009. – V. 603, N 22. – P.3297–3300.