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Salt Systems And Natural Resources

Scientific topics

The activities of the Laboratory “SALT SYSTEMS AND NATURAL RESOURCES" (SSNR) at IGIC – BAS are focused on fundamental and applied research in the fields of inorganic material science and preservation and utilization of natural resources.

  • Inorganic material science

The research in this field is targeted in two directions:

– chemistry of water-salt systems;

– synthesis and characterization of calcium phosphate biomaterials.

Chemistry of water-salt systems. Theoretical and experimental studies are carried out on the processes of dissolution and crystallization in water-salt two-, three- and multicomponent systems. Crystallization and co-crystallization processes of simple and double salts, as well as of mixed crystals are being investigated. The kinetics of the processes is studied. Stable and metastable phase equilibria are thermodynamically modeled. The regularities between the composition and structure of the solutions and the structure and type of crystallizing solids are established. Interactions taking place in systems under changing conditions are predicted and clarified.

Synthesis and characterization of calcium phosphate biomaterials. Studies on the synthesis and characterization of biomedical materials, including nano- and modified calcium-phosphate composites, are being carried out. Modern instrumental and computational methods are applied to the investigation of the relationship composition-structure-property. Technologies for the production of biomaterials (mainly for dental medicine) with modified chemical and improved physical characteristics and biological activity are being developed.

  • Preservation and utilization of natural resources

The research is focused on two directions:

– environmental studies;

– sustainable use.

Environmental studies aim at evaluating, predicting and improving the ecological status of industrially polluted natural waters, soils and vegetation by applying various analytical methods and thermodynamic models. Field and laboratory studies are being conducted to determine the degree of contamination, mobility and phytoaccumulation of transition metals. Various thermodynamic models (ionic association model, ionic interaction model and Stockholm- Humic model) are being applied to determine the inorganic and organic chemical species and dynamics of transition metals in the water – soil – soil extract – vegetation ecosystem.

Sustainable use. Natural mineral raw materials are being used to develop alternative biologically active materials containing biogenic trace elements and their compounds that affect the nervous, antioxidant and immune systems or regulate the mineral dysbalance in the body. Priority use is made of the mineral resources of the Black Sea. Product technologies for medical cosmetics and pharmaceutical industry are being developed. Small-scale production is organized.

Selected articles

  1. Sezanova, K., Gergulova, R., Shestakova, P., Rabadjieva, D.
    Thermodynamic and Kinetic Studies of the Precipitation of Double-Doped Amorphous Calcium Phosphate and its Behaviour in Artificial Saliva,
    Biomimetics,  9(8) (2024) 455.
  2. Díaz-Cuenca, A., Sezanova, K., Gergulova, R., Rabadjieva, D., Ruseva, K.
    New Nano-Crystalline Hydroxyapatite-Polycarboxy/Sulfo Betaine Hybrid Materials: Synthesis and Characterization
    Molecules, 29(5) (2024) 930.
  3. Rabadjieva, D., Kovacheva, A., Gergulova, R., Ilieva, R., Tepavitcharova, S.
    Thermodynamic Elucidation of the Relationship Chemical Species in Aqueous Soil Extracts—Phytoaccumulation,
    Journal of Solution Chemistry, 53(4) (2024) pp. 594–605,
  4. Kovacheva, A., Rabadjieva, D., Ilieva, R., Gergulova, R.
    Pollution assessment of the rivers flowing through large Bulgarian cities. A comparative study,
    International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM, 24(5.1) (2024) pp. 189–196.
  5. Kovacheva, A., Gergulova, R., Ilieva, R., Rabadjieva, D., Vladov, I., Nanev, V.,
    Thermodynamic modeling of river water as a tool for environmental impact evaluation.
    Journal of Chemical Technology and Metallurgy, 59(2) (2024) pp. 287–300.
  6. Havlíček, D., Tepavitcharova, S., Fridrichová, M., Plocek J., Gergulova, R., Rabadjieva, D.,
    Manganese-glycine-nitrate complexes – Synthesis, structural and thermal characterization,
    Journal of Molecular Structure, 1290 (2023) 135972.
  7. Rabadjieva, D., Gergulova, R., Ruseva, K., Bonchev, A., Shestakova, P., Simeonov, M., Vasileva, R., Tatchev, D.,. Titorenkova, R., Vassileva, E.,
    Polycarboxy/Sulfo Betaine—Calcium Phosphate Hybrid Materials with a Remineralization Potential.
    Materials, 16(20) (2023) 6640.
  8. Rabadjieva, D., Gergulova, R., Sezanova, K., Kovacheva, D., Titorenkova, R.,
    Mg, Zn Substituted Calcium Phosphates—Thermodynamic Modeling, Biomimetic Synthesis in the Presence of Low-Weight Amino Acids and High Temperature Properties,
    Materials, 16(20) (2023) 6638.
  9. Díaz-Cuenca, A., Rabadjieva, D., Sezanova, K., Ilieva, R., Tepavitcharova, S.,
    Biocompatible calcium phosphate-based ceramics and composites,
    Materials Today: Proceedings, 61 (2022) pp. 1217–1225.
  10. Rabadjieva D, Tepavitcharova S, Kovacheva A, Gergulova R, Ilieva R, Vladov I, Nanev V, Gabrashanska M, Karavoltsos S.
    Trace metals accumulation in the eco-system water – soil – vegetation (Agropyron cristatum) – common voles (Microtus arvalis) – parasites (Hymenolepis diminuta) in Radnevo region, Bulgaria,
    J Trace Elem Med Biol, 66 (2021) 126750.

Scientific Collaboration

  • Department of Inorganic Chemistry, Faculty of Science, Charles University, Czech Republic
  • Institute of Inorganic Chemistry of the ASCR, Czech Republic
  • Department of Chemistry, Laboratory of Environmental Chemistry, National and Kapodistrian University of Athens, Greece

Staff:

Diana Rabadjieva

Professor, PhD, Head of Laboratory

Call: +359 2 979 39 25

Email: didiarab@svr.igic.bas.bg

    Stefka Tepavitcharova

    Assoc. Professor, PhD

    Call: +359 2 979 39 08 +359 2 979 39 26

    Email: stepav@svr.igic.bas.bg

      Kostadinka Sezanova

      Assist. Prof., PhD

      Call: +359 2 979 39 26 +359 2 979 25 35

      Email: ksezanova@svr.igic.bas.bg

        Antonina Kovacheva

        Assist. Prof. PhD

        Call: +359 2 979 2535

        Email: akovacheva@svr.igic.bas.bg

          Stoyan Kamburov

          Chem. Eng., PhD

          Call: +359 2 979 39 25

          Email: s.kamburov@svr.igic.bas.bg

            Radost Ilieva

            assistant, chemical engineer

            Call: + 359 2 979 2535

            Email: rilieva@svr.igic.bas.bg

              Rumijana Gergulova

              аssistant, MSc

              Call: +359 2 979 25 35

              Email: rumigg@svr.igic.bas.bg

                Staff - Burgas:

                Tsvetelyuba Petrova

                Chemical analyst Chem. Eng.

                  Nadezhda Georgieva

                  Technologist Chem. Eng.

                    Jeannette Zhelezova

                    Production manager Eng.

                      Peter Georgiev

                      Machine operator

                        Dimitar Duganov

                        Machine operator

                          Dorina Todorova

                          Machine operator

                            Katya Kaneva

                            Machine operator

                              Stoyanka Popova

                              Machine operator

                                Rosen Atanasov

                                Machine operator

                                  Maria Jekova

                                  Machine operator

                                    Veselin Rajkov

                                    Machine operator

                                      Scientific projects

                                      Investigation on novel hybrid modified calcium phosphates systems with enhanced biomineralization activity

                                      Program National Scientific Fund
                                      Coordinator: Prof. Dr. E. Vasileva - Sofia University “St. Kl. Ohridski”
                                      Base organization - Sofia University “St. Kl. Ohridski”
                                      Partners: IGIC-BAS, IOCCP-BAS
                                      Lieder of the team from IGIC-BAS Prof. Dr. D. Rabadjieva
                                      Period: 2020 – 2024

                                      Chemical species of trace metals, their behavior in polluted natural waters and soils and impact on the ecosystem plants – small mammals – endoparasites. Experimental study and thermodynamic modeling (GEOBIOCHEM)

                                      Program National Scientific Fund
                                      Coordinator Assoc. Prof. D. Rabadjieva
                                      Partner organizations IEMPAM-BAS
                                      Period 2017 - 2020

                                      Chemistry of water-salt systems for the recovery of natural mineral resources and waste products, in particular marine chemical resources

                                      Program: Self-financing
                                      Coordinator: Assoc. Prof. S. Tepavitcharova
                                      Period : 2001 – 2020

                                      National research program "Environmental protection and reduction of adverse events and natural disasters’ risks"

                                      Program Ministry of Education and Science
                                      Lieder of the team from IGIC-BAS Assoc. Prof. Dr. D. Rabadjieva

                                      Period 2018 – 2023

                                      Study on the relationship synthesis - structure - interphase transitions - mechanical properties- biological properties of calcium phosphate composite biomaterials with applications in bone surgery and dental medicine- DFNI Т 02-5/12.12.2014

                                      Program National Scientific Fund
                                      Coordinator Assoc. Prof. D. Rabadjieva
                                      Partner organizations IEMPAM-BAS
                                      Faculty of Chemistry and Pharmacy, Sofia University
                                      Faculty of Dental Medicine, Medical University-Sofia
                                      Period 2014 – 2017

                                      Biomaterials for bone implants - calcium-phosphate based ceramics, cements and hybrid materials DTK 02-70/17.12.2009

                                      Program National Scientific Fund
                                      Coordinator Assoc. Prof. Dr. Sл Tepavitcharova
                                      Partner organizations
                                      Faculty of Chemistry and Pharmacy, Sofia University
                                      IEMPAM-BAS
                                      Faculty of Dental Medicine, Medical University-Sofia
                                      Period 2009 - 2014