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BULGARIAN ACADEMY OF SCIENCES

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Materials Science Laboratory

phone: (+359 2) 979 2708, e-mail: sasho.vassilev@iees.bas.bg

Research area

The Materials Science Laboratory performs various types of analysis in support of the research activities of IEES, including: X-ray phase and structural analysis of solid phase materials; characterization of crystal/particle size and morphology by electron microscopy techniques (SEM, TEM and X-ray microanalysis). Materials porosity measurements are carried out, including: total pore volume, pore size distribution, bulk and skeletal density, specific surface area, etc. The Laboratory conducts also chemical composition analysis of lead, lithium and nickel compounds, carbons and other chemical substances used as raw materials in the manufacture of electrochemical power sources, as well as of the intermediate products obtained as a result of chemical conversions at different stages of battery operation.

Staff

  • Sasho Vassilev, Professor, PhD (head)
  • Mariela Dimitrova, Res. Assist., PhD
  • Adriana Gigova, Res. Assist.
  • Ognyan Dimitrov, PhD student
  • Rositsa Andreeva, Technologist
  • Yordanka Kovacheva, Technologist
  • Antonia Bakalova, Technologist
Staff

Projects (2011 - 2021)

The Materials Science Laboratory provides service to all IEES researchers in support of their research activities and projects, as well as to other research institutes of BAS and to universities and higher institutes.

Publications (2011 - 2019)

  1. Dimitrov, O, Stambolova, I, Lazarova, K, Babeva, T, Vassilev, S, Shipochka, M. The effect of different acid stabilizers on the morphology and optical properties of ZrO2 sol-gel films. Bulgarian Chemical Communications, 50, Special Issue F, 2018, 167-172.
  2. Pavlov D., Naidenov V., Milusheva Y., Vassilev S., Shibahara T., Tozuka M., Benzyl benzoate as an inhibitor of the sulfation of negative electrodes in lead-acid batteries, J. Energy Storage 17 (2018) 336-344, ISSN 2352-152X, https://doi.org/10.1016/j.est.2018.03.021.
  3. Uzun D., Pchelarov G., Dimitrov O., Vassilev S., Obretenov W., Petrov K.. Electrochemical oxidation of sulphites by DWCNTs, MWCNTs, higher fullerenes and manganese. Journal of Physics: Conference Series, 992 (2018) 012028, Institute of Physics, 2018, ISSN:17426596, DOI: doi.org/10.1088/1742-6596/992/1/012028.
  4. Zhelev, V., Petkov, P., Shindov, P., Bineva, I., S. Vassilev, Ilcheva, V., Petkova, T.. As-doped SnO2 thin films for use as large area position sensitive photodetector. Thin Solid Films, 653, 2018, ISSN:0040-6090, DOI: doi.org/10.1016/j.tsf.2018.03.009, 19-23.
  5. Shipochka, M., Eliyas, A., Stambolova, I., Blaskov, V., Vassilev S., Simeonova S., Balashev K.. Synthesis of TiO2 on SnO2 bicomponent system and investigation of its structure and photocatalytic ativity. Materials Chemistry and Physics, 220, Elsivier, 2018, ISSN:0254-0584, DOI: https://doi.org/10.1016/j.matchemphys.2018.08.054, 249-259.
  6. Stambolova I., Yordanov S., Lakov L., Blaskov V., Vassilev S., Alexandrova M., Jivov B., Kostova Y., Simeonova S., Balashev K.. Development of new nanosized sol gel coatings on steel with enhanced corrosion resistance. International Scientific Journal: Materials science. Non-equilibrium phase transformations, 1, Scientific Technical Union of Mechanical Engineering "Industry-4.0", 2018, ISSN:2535-0218, 18-20.
  7. Yordanov S., Stambolova I., Blaskov V., Lakov L., Vassilev S., Jivov, B., Eliyas, A., Petrov V.. Anticorrosion sol-gel coatings of CeO2, ZrO2 and TiO2 deposited on SiO2 underlayer. International Journal “NDT Days", 1, Bulgarian Society for NDT (BG S NDT), 2018, ISSN:2603-4018, 305-313.
  8. Yordanov S., Stambolova I., Blaskov V., Lakov L., Vassilev S., Kostova Y., Jivov B.. Effect of treatment temperature of TiO2/SiO2 and ZrO2/SiO2 coatings on their corrsion stability. MTM Mashines Technologies Materials, 5, Scientific-Technical Union of Mechanical Engineering, 2018, ISSN:1313-0226, 222-224.
  9. Abrashev, B., Spassov, T., Pandev, M., Vassilev, S., Popov, A.. Hydrogen sorption and electrochemical properties of Ti-Fe based alloys synthesized by mechanical alloying. Bulgarian Chemical Communications, 49, C, 2017, 247-253. 
  10. I. Koseva, P.T. Tzvetkov, A.S. Yordanova, M.O. Marychev, O.S. Dimitrov, V.S.Nikolov. Preparation of chromium doped LiAlSiO4 glass-ceramics. Bulgarian Chemical Communications, 49, 2, Bulgarian Academy of Sciences, 2017,  366-370. 
  11. Mladenov, M., Stoyanov, L., Vassilev, S., Soserov, L.. Effect of electrodes and cell structures on the properties of the PbO2//C-Pb quasi-asymmetric supercapacitor. Proc. 10th Intl. Conference on Lead-Acid Batteries,13-16 June 2017, Golden Sands, Bulgaria, 10, LEAD-ACID BATTERIES DEPARTMENT, 2017, ISSN:2367-4881, 61-64.
  12. Pchelarov, G., Uzun, D., Razkazova-Velkova, E., Dimitrov, O., Vassilev, S., Petrov, K.. Electrocatalysts for sulphur ions oxidation based on DWCNTs, MWCNTs, higher fullerenes and manganese. Bulgarian Chemical Communications, Vol. 49, Special Issue C, 2017.
  13. Tomov, I., Vassilev, S., Avdeev, G.. Expressing the extinction-free integral breadth. Bulgarian Chemical Communications, 49, 2017, 126-129.
  14. Zaharieva, K., Milenova, K., Vassilev, S., Dimova, S., Stambolova, I., Blaskov, V.. Preparation and comparative photocatalytic study of NiMnO3/Mn2O3 and NiO0.8ZnO0.2/ZnO materials for the removal of Malachite Green dye from aqueous solution. Bulgarian Chemical Communications, 49, D, 2017.
  15. Balashev, K., Stambolova, I., Blaskov, V., Georgiev, P., Simeonova, S., Vassilev, S., Eliyas, A., Photocatalytically active Au/TiO2 films deposited by two-step spray pyrolysis. Comptes rendus de l'Academie bulgare des Sciences, 69, 3, 2016, 269-274.
  16. I. Koseva, P. Tzvetkov, A. Yordanova, M. Marychev, V. Nikolov, O. Dimitrov, Preparation of chromium doped glass-ceramics containing NaAlSiO4 and Na3B3O6 phases. Bulgarian Chemical Communications, 48, Special Issue G, 2016,  101-106.
  17. Stambolova, I., Georgiev, V., Batakliev, T., Lutzkanov, L., Blaskov, V., Atanasova, G., Vassilev, S., Eliyas, A., Synthesis and characterization of nickel- and silver-loaded activated carbon catalysts for ozone decomposition. Journal of Chemical Technology and Metallurgy, 51, 2, University of Chemical Technology and Metallurgy, 2016, 181-187.
  18. M. Kandeva, V.N. Blaskov, N.G. Kostova , I.D. Stambolova, K.T. Balashev, S. Vassilev, A. Eliyas, M. Shipochka, Comparative study of wear resistance of TiO2 coatings with cerium and chromium additives, J. Balkan Tribol. Assoc., 21, No 4 (2015) 857–865
  19. M. Shipochka, K. Milenova, L. Dimitrov, V. Blaskov, I. Stambolova, D. Stoyanova, A. Eliyas, S. Vassilev, Hydrothermal treatment of polymer-assisted precipitate for preparation of photocatalytic active zinc oxide powder, NanoScience & NanoTechnology Magazine V2, (2015) 7-9
  20. V. Blaskov, I. Stambolova, V. Georgiev, T. Batakliev, M. Shipochka, S. Vassilev, D. Mehandjiev, Synthesis and catalytic activity of silver coated perlite in the reaction of ozone decomposition, Ozone Science and Engineering, 37 (2015) 252–256, IF: 1.257
  21. K. Zaharieva, K. Milenova, A. Eliyas, I. Stambolova, S. Vassilev, V. Blaskov, Z. Cherkezova-Zheleva, S. Rakovsky, I. Mitov, Photocatalytic performance of acid impregnated ZnO powders and mechanochemical treatment for discolouring of textile dye, Tribological Journal BULTRIB, V5 (2015) 239.
  22. M. Kandeva, V. Blaskov, N Kostova, I. Stambolova, K. Balashev, S Simeonova, S. Vassilev, A. Eliyas, Tribological properties of sprayed TiO2 and TiO2/ZnO coatings, Tribological Journal BULTRIB V 5 (2015) 205.
  23. K. Milenova, K. Zaharieva, A. Eliyas, I. Stambolova, V. Blaskov, O. Dimitrov, L. Dimitrov, Z. Cherkezova-Zheleva, S. Rakovsky, Comparison of the photocatalytic activities of Ag/ZnO and mechanochemically activated Ag/ZnO in the decomposition of Reactive Black 5 and Malachite Green dyes, Tribological Journal BULTRIB, V 5 (2015) 255-259
  24. K. Milenova, A. Eliyas, V. Blaskov, I. Stambolova, S.Vassilev, S. Rakovsky, Nitric Acid Activation of La-doped ZnO Photocatalyst for Water Decontamination, Journal of Chemical Technology and Metallurgy, 50(5) (2015) 606-612.
  25. K. Milenova, A. Eliyas, V. Blaskov, I. Avramova, I. Stambolova, S. Vassilev, P. Nikolov, N. Kassabova, S. Rakovsky, Comparative study of ZnO photocatalyst samples prepared by different methods”, Bulgarian Chemical Communications, 47(1) (2015)190–196.
  26. K. Milenova, A. Eliyas, V. Blaskov, I. Avramova, I. Stambolova, Y. Karakirova, S. Vassilev, P. Nikolov, N. Kassabova, S. Rakovsky, Copper doped zinc oxide nanopowders used for degradation of residual azo dyes in wastewaters, Bulgarian Chemical Communications, 47 (1) (2015) 336–341.
  27. M. Kandeva, V. Blaskov, I. Stambolova, N.G. Kostova, A. Eliyas, S. Vassilev, Study of wear resistance of TiO2 sprayed coatings. Correlation between deposition parameters and wear properties, Proceedings of 11th International conference “THE A Coatings”, Editors: K.-D. Bouzakis, K. Bobzin, B. Denkena, M. Merklein, October 1-3, 2014, Thessaloniki, Greece, pp. 203-210, ISBN-11: 3844-0178X.
  28. Uzunova, S., Angelova D., Uzunov I., Gigova A., Changes in structure of solid pyrolysis residue during slow pyrolisys of rice husk, Bulgarian Chemical Communications, 46, 1 (2014) 184-191.
  29. O. Dimitrov, D. Nesheva ,V. Blaskov , I. Stambolova , S. Vassilev, Z. Levi ,V. Tonchev, Gas sensitive ZnO thin films with desired (002) or (100) orientation obtained by ultrasonic spray pyrolysis, Materials Chemistry and Physics 148 (2014) 712
  30. I. Stambolova, V. Blaskov, N. Kaneva, M. Shipochka, S. Vassilev, O. Dimitrov, A. Eliyas, Effect of titanium dopant on the surface features and on the photocatalytic characteristics of ZnO films, Materials Science in Semiconductor Processing, 25 (2014) 244-250
  31. I. Stambolova, V Blaskov, M Shipochka, A Eliyas, S Vassilev, Effect of post synthesis acid activation of TiO2 nanofilms on the photocatalytic efficiency under Visible light, IOP Science , J. Phys. Conf. Ser., 558 (2014) 012055
  32. N. Kaneva, I. Stambolova, V. Blaskov, A Eliyas, S. Vassilev, Мicrowave-assisted and conventional sol-gel preparation of photocatalytically active ZnO/ТiО2/glass multilayers, Centr. Eur. J. Chem., (2013), Volume 11, Issue 7, pp. 1055-1065.
  33. Alexander E. Eliyas, Ljutzkan Ljutzkanov, Irina D. Stambolova, Vladimir N. Blaskov, Sasho V. Vassilev, Elena N. Razkazova-Velkova, Dimitar R. Mehandjiev, Visible light photocatalytic activity of TiO2 deposited on activated carbon, Central Eur. J. Chem., 11 (3) (2013) 464-470.
  34. I. Stambolova, V. Blaskov, O. Dimitrov, Influence of different process parameters upon microstructure of ZnO films preparared by spray pyrolysis, Revue Roumaine de Chimie, 58 (11-12) (2013) 843-853
  35. I. Stambolova, V. Blaskov, S. Vassilev, M. Shipochka, A. Loukanov, Effect of substrate type, dopant and thermal treatment on the physicochemical properties of TiO2-SnO2 sol gel film, Bull Mater Sci, 35 (2012) 645.
  36. Hristov, P., Yoleva, A., Djambazov, S., Vladov, R., Gigova, A., Ceramic membranes on the basis of aluminium titanate, Journal of the University of Chemical Technology and Metallurgy, 47, 4 (2012) 471-475
  37. Uzunov I., Uzunova S., Angelova D., Gigova A., Effects of the pyrolysis process on the oil sorption capacity of rice hus. Journal of Analytical and Applied Pyrolysis, 98 (2012) 166-176.
  38. Genov K., Blaskov V., Vassilev S., Boevski I., Shipochka M., Stambolova I., Some physicochemical properties of silver loaded clinoptilolite from Beli plast, East Rhodopes by spray pyrolysis method, Bulgarian Chemical Communications, 44 (2) (2012) 144-147.
  39. S. Vassilev, K. Genov, V. Blaskov, M. Shipochka, I. Boevski, I. Stambolova, Preparation of supported copper catalyst by spray pyrolysis of copper acetate on HEU zeolite, Comptes rendus de l’Acad´emie bulgare des Sciences, Tome 65, No 1, (2012) 41.
  40. I. Stambolova, V. Blaskov, S. Vassilev, M. Shipochka, A. Loukanov, Effect of substrate type, dopant and thermal treatment on the physicochemical properties of TiO2-SnO2 sol gel film, Bull Mater Sci, 35 (2012) 645.
  41. O. Dimitrov, D. Nesheva, Z. Levi, I. Miloushev, T. Tenev, V. Blaskov, I. Stambolova, Ultrasonically sprayed ZnO films: optical, electrical and gas sensing properties, Journal of Physics: Conference Series. 398, (2012) 012-022
  42. I. Stambolova, V. Blaskov, I.N. Kuznetsova, N.Kostova, S.Vassilev, Effect of the thermal treatment on the morphology and optical properties of nanosized TiO2 films, Journal of Optoelectronics and Advanced Materials, 13 (2011) 381-386, ISSN: 1454-4164.
  43. Angelova D., Uzunov I., Uzunova S., Gigova A., Minchev L., Kinetics of oil and oil products adsorption by carbonized rice husks. Chemical Engineering Journal, 172, 1 (2011) 306-311.
  44.  K. Genov, I. Stambolova, M. Shipochka, I. Boevski, S. Vassilev, V. Blaskov, Ag coated Bulgarian natural glass perlite via spray pyrolysis for decomposition of ozone, Journal of the University of Chemical Technology and Metallurgy, 464 (2011) 363-368.
  45. I. Stambolova, V. Blaskov, I.N. Kuznetsova, N. Kostova, S. Vassilev, Effect of the thermal treatment on the morphology and optical properties of nanosized TiO2 films, J. Optoelectr. Adv. Mater. V.13 (2011) 381–386
  46. I. Tomov, S. Vassilev, Nullifying the extinction effect by reforming the extinction corrections, 5th National Crystallographic Symposium with international participation, Sofia, Bulgaria, 25-27 September 2014
  47. I. Tomov, S. Vassilev, Nullification of Extinction Effects in XRD Characterizations of Real Structure of Materials, Proc. Third National Crystallographic Symposium, 3-5 October, 2011, Sofia, Bulgaria.
  48. I. Tomov, S. Vassilev, Nullification of extinction effects in XRD analysis, Proc. XXII Congress and General Assembly of the International Union of Crystallography, 22-30 August, 2011, Madrid, Spain.
  49. I. Tomov. S. Vassilev G., Andreev, An enxtinction-free technique for pole density measurements of trxtures by XRD, Bulgarian Chemical Communications, Volume 43, 2011, Number 2, pp. 334-338, ISSN 0324-1130.