Assoc. Prof. Dimitre Dimitrov

The Laboratory of Nanoparticle Science and Technology, LNST was established by the late Assoc. Prof. C. D. Dushkin  in 2000 as a part of the Department of General and Inorganic Chemistry. Being unique unit for the University of Sofia, LNST aims to develop new nanomaterials based on the experience acquired abroad and the departmental traditions in inorganic chemistry, new materials synthesis, materials science, catalysis, colloid chemistry, etc. LNST synthesizes nanoparticles of various materials: semiconductors, metals and metal oxides (compound and doped materials), polymer capsules, etc. The investigation of the kinetics of nanoparticle growth and the characterization of these materials allow controlling of their size and properties in the different conditions of their synthesis. LNST deals also with the preparation of thin films from nanoparticles and sol-gel for applications in different devices: light emitters, sensors and photocatalytic reactors for purification of water and air. The laboratory participates in research project financed by NATO Science for Piece Program, COST, NSF Bulgaria, Nihon L’Oreal K.K., Japan, etc. LNST has a permanent staff of two Associate Professors and seven Assistant Professors.

The nanoparticles with narrow size distribution and uniform geometry, synthesized in the laboratory can be applied in various fields does to their peculiar physical properties, which are different from those of the respective bulk material. The methods of nanoparticle synthesis use various organometallic compounds in colloidal dispersions such as micelles, microemulsions or amphiphile matrixes. The nanoparticles comprise of inorganic core of the material determining their properties and of organic shell, a residue from the matrix of synthesis. Their surface can be modified by adsorbing other organic molecules making the nanoparticle biocompatible or changing its properties. Monitoring the process of nanoparticle growth is used to control the size in the range required for the applications. In relation to the environmental protection, the activities of the laboratory are directed to photocatalytic reactors for purification of water and air, and preparation of materials for sensors [[1],[2]].

 


[1] D. Tz. Dimitrov, S. Y. Anastasova, C. D. Dushkin, “Oxygen Sensing Junction Based on Yttria Stabilized Zirconia with Platinum Nanoparticles”, Review Scientific Instruments 77, 056108 (2006).

[2] A. Bojinova, R. Kralchevska, I. Poulios, C. Dushkin, “Anatase/rutile TiO2 composites: Influence of the mixing ratio on the photocatalytic degradation of malachite green and orange II in slurry”, Materials Chemistry Physics 106, 187–192 (2007).