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LABORATORY OF LIGHT-INDUCED PHASE TRANSITIONS

 

 
 

 

Studies of light-induced phase transitions in water and aqueous solutions of electrolytes as well as in organic fluids are carried out in the laboratory. At present the effect of dissolved gas under stimulation of optical breakdown in liquids is investigated in collaboration with the Institute of General and Inorganic Chemistry of Russian Academy of Sciences. The results of investigation of optical breakdown have extensive applications in medicine (particularly, in ophthamologic microsurgery).

Staff

  • M. F. Bukhenskii, Ph.D.
  • A. V. Lobeyev, Ph.D.
  • S. L. Popyrin, Ph.D.
  • I. I. Tugov, Ph.D.

    • The laboratory is headed by N. F. Bunkin, D.Sc.

    PRINCIPAL FIELDS OF RESEARCH

  • Phase transitions of stratification in binary liquid mixtures;
  • Spinodal decay;
  • Optical breakdown (plasma formation);
  • Light-induced coagulation of microparticles;
  • Light-induced barodiffusion;

    • BASIC EQUIPMENT

  • A pulsed-periodic YAG:Nd3+ laser;· A pulsed-periodic excimer XeCl laser;
  • A setup for low-angle laser beam scattering;
  • A setup for measuring parameters of optical breakdown plasma;

    • MOST IMPORTANT RESULTS

  • Experimental observation of oscillation temporal mode of spinodal decay of a stratifying mixture at a deep setting in the labile area;
  • Experimental observation of the barodiffusion effect in a liquid;
  • Experimental proof of the hypothesis of existence of gas nanobubble microphase (bubstons) in liquids;
  • Determination of a new mechanism of the Rayleigh-wing light-scattering in an electrolyte solution associated with fluctuations of ionic concentration;

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    The act of boiling at the atmosphere pressure and 98°C is shown in the picture. The phenomenon is conditioned by the fact that laser shooting of liquid stimulates coalescsence (merging) of nanobubble (bubston) cluster. As the result a vapor-gas bubble of the size of several microns arises. Such a bubble vanishes immediately far from the boiling point, whereas this bubble serves as center of heterogeneous boiling close to the boiling point.

     

    		 
     

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