Irena Mihailova
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View article: The Impact of Electron Beam Melting on the Purification of Recycled Zirconium
The Impact of Electron Beam Melting on the Purification of Recycled Zirconium Open
Zirconium belongs to the group of critical rare metals and is primarily used in industry. Its most important application, as the basis for specialized alloys, is in nuclear reactors, owing to its exceptionally very low thermal neutron abso…
View article: New Glass-Ceramics in the System Ca2SiO4-Ca3(PO4)2—Phase Composition, Microstructure, and Effect on the Cell Viability
New Glass-Ceramics in the System Ca2SiO4-Ca3(PO4)2—Phase Composition, Microstructure, and Effect on the Cell Viability Open
The CaO-SiO2-P2O5 system is one of the main systems studied aiming for the synthesis of new bioactive materials for bone regeneration. The interest in materials containing calcium-phosphate-silicate phases is determined by their biocompati…
View article: Study of in vitro bioactivity of biogenic hydroxyapatite synthesized from Black Sea Rapana venosa shells
Study of in vitro bioactivity of biogenic hydroxyapatite synthesized from Black Sea Rapana venosa shells Open
The biogenic hydroxyapatite (BHA) used in this study was synthesized via solid-state reaction from Rapana venosa shells - a natural CaO source and monocalcium phosphate monohydrate Ca(H2PO4)2 ?H2O. The in vitro bioactivity of the synthesiz…
View article: SODA LIME SILICATE GLASSES CONTAINING IRON OXIDE - IN VITRO EVALUATION
SODA LIME SILICATE GLASSES CONTAINING IRON OXIDE - IN VITRO EVALUATION Open
Three glasses with different iron oxide concentrations (between 5 and 8.1 mol %) were obtained in the CaO - Na2O - SiO2 - Fe2O3 system by using conventional melting-quenching technique. The amorphous nature of the synthesized materials is …
View article: Contribution of University of Chemical Technology and Metallurgy to the Development of Technical Mineralogy and Petrography in Bulgaria
Contribution of University of Chemical Technology and Metallurgy to the Development of Technical Mineralogy and Petrography in Bulgaria Open
This brief review of the scientific research activity of scientists from the field of Mineralogy and Petrography at University of Chemical Technology and Metallurgy (UCTM) for more than 40 years (in the period 1961-2007) clearly outlines t…
View article: α/β-TCP silicate glass-ceramic obtained by sol–gel: Structure and in vitro bioactivity
α/β-TCP silicate glass-ceramic obtained by sol–gel: Structure and in vitro bioactivity Open
A glass-ceramic in the CaO–P2O5–SiO2 system, which contains two polymorphic modifications of tricalcium phosphate – whitlockite, β-Ca3(PO4)2 and α-Ca3(PO4)2, has been synthesized by the sol–gel method and thermal treatment up to 1200 °C. T…
View article: Magnetite Crystallization in a Sodium-Calcium-Silicate Glass with High Iron Oxide Concentration – Effect on the Magnetic Properties
Magnetite Crystallization in a Sodium-Calcium-Silicate Glass with High Iron Oxide Concentration – Effect on the Magnetic Properties Open
View article: Contribution of University of Chemical Technology and Metallurgy to the development of technical mineralogy and petrography in Bulgaria
Contribution of University of Chemical Technology and Metallurgy to the development of technical mineralogy and petrography in Bulgaria Open
This brief review of the scientific research activity of scientists from the field of Mineralogy and Petrography at University of Chemical Technology and Metallurgy (UCTM) for more than 40 years (in the period 1961-2007) clearly outlines t…
View article: PHYSICOCHEMICAL AND STRUCTURAL CHARACTERIZATION OF SILICATE GLASSES CONTAINING IRON OXIDES
PHYSICOCHEMICAL AND STRUCTURAL CHARACTERIZATION OF SILICATE GLASSES CONTAINING IRON OXIDES Open
The interest in glasses containing iron oxides is determined by the possibility for application in optics, sensors,nanoelectronics, biotechnology and medicine. Subject of the present investigation is the preparation of glasses inthe system…
View article: Valorization of Peanut and Walnut Shells through Utilisation as Biosorbents for the Removal of Textile Dyes from Water
Valorization of Peanut and Walnut Shells through Utilisation as Biosorbents for the Removal of Textile Dyes from Water Open
The present research focuses on the application of peanut and walnut shells, in their natural state, for the removal of methylene blue (MB) from water solutions in batch and dynamic (flow-through) conditions. Under batch conditions, at a 1…
View article: Glass–crystalline materials with high iron oxide concentration: Phase composition, redox ratio and magnetic properties
Glass–crystalline materials with high iron oxide concentration: Phase composition, redox ratio and magnetic properties Open
The synthesis of glass–crystalline materials in the system Na2O/CaO/SiO2/Fe2O3 with high concentrations of Fe2O3 (20, 25 and 30 mol%) by applying the melt-quenching technique is reported. The melts spontaneously crystallize during pouring …
View article: IR-spectroscopy, thermophysical and mechanical properties of glasses in the system Na<sub>2</sub>O/BaO/TiO<sub>2</sub>/B<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>
IR-spectroscopy, thermophysical and mechanical properties of glasses in the system Na<sub>2</sub>O/BaO/TiO<sub>2</sub>/B<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> Open
Glasses with the compositions (23.1-x)Na 2 O/23.1BaO/23TiO 2 /9.8B 2 O 3 /21SiO 2 /xAl 2 O 3 x = 3, 7, 11 and 15 mol% were melted using a traditional melt-quenching technique.The thermophysical properties of the obtained glasses, i.e., gla…
View article: Solid-state synthesis of hydroxyapatite from black sea rapana venosa shells
Solid-state synthesis of hydroxyapatite from black sea rapana venosa shells Open
Hydroxyapatite (HA) is a major non-organic component of bones and is widely used as orthopaedic and dental material.It is widely used in biological materials due to the apatite-like structure of enamel, dentin, and bones.Black Sea Rapana v…
View article: Novel merwinite/akermanite ceramics: in vitro bioactivity
Novel merwinite/akermanite ceramics: in vitro bioactivity Open
The ceramics in the system CaO – MgO – SiO2 has recently received a great deal of attention because they exhibit good in vitro bioactivity and have potential use as bone implants. Biphasic calcium-magnesium-silicate ceramics was prepared b…