Ralitsa Georgieva

Ralitsa Georgieva
Bulgarian Academy of Sciences | BAS · Institute of General and Inorganic Chemistry

PhD

About

18
Publications
2,781
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83
Citations
Citations since 2016
1 Research Item
36 Citations
20162017201820192020202120220246810
20162017201820192020202120220246810
20162017201820192020202120220246810
20162017201820192020202120220246810
Education
March 2002 - June 2009

Publications

Publications (18)
Article
CaWO4 nanoparticles were successfully obtained by direct mechanochemical synthesis. In the search of new and advanced catalysts, the CaWO4 has been modified by Pd and characterized by various techniques such as: N2-physisorption, XRD, IR, TEM, XPS, TPR and TPD. The results from the instrumental methods confirmed that CaWO4 can be formed at room tem...
Article
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The present paper deals with chemical and physicochemical characterization of seven glass fragments of medieval glass bracelets from South-East Bulgaria. Samples were investigated by Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and differential thermal analysis (DTA). Gravimetric chemical analysis was used...
Article
Full-text available
The content of S, Cl, K, Ca, Mn, Fe, Ni, Cu, Zn, As, Br, Rb and Ba in several brands of Bulgarian bottled potable waters (" Savina " table, " Gorna Banya " mineral, " Bankya " mineral, " Kom " mineral, " Thorn Spring " mineral, " Hissar " mineral, " Devin " spring and mineral and " Mihalkovo " spring and mineral) was determined by total reflection...
Article
Full-text available
In the present study four functionalized mesoporous silica materials denoted as BIS-1, BIS-2, BIS-3 and BIS-4 have been synthesized through a simple co-condensation of bis-[3-(trimethoxyosilyl)propyl] amine (BTPA) and tetraethyl orthosilicate (TEOS). The influence of the BTPA amount on the structural and adsorption properties of the resultant mater...
Article
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The trace elements S, Cl, K, Ca, Mn, Fe, Ni, Cu, Zn, As, Br, Rb and Ba in Bulgarian bottled mineral waters of low and high total dissolved solids (TDS) content were determined by total reflection X-ray fluorescence (TXRF) analysis using gallium as internal standard. The water samples were analysed after simple preparation consisting in three-fold s...
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The adsorption properties of two new nanostructured hybrid materials containing B2O3 and ZrO2 were studied. The new organic-inorganic materials were synthesized via a sol-gel method. As a modifying agent, a quantity of 10 wt.% Zr(OPr)4 or B(OCH3)3 was added. The structure of the hybrid materials was investigated by means of (Fourier transform infra...
Article
Full-text available
In the present study the possibilities of electrothermal vaporization inductively coupled plasma optical emission spectrometry (ETV-ICP-OES) for characterization of archaeological glasses were investigated. The objects of our research were fragments of a colorless late antique Roman flat window glass (fifth century A.D.) and colored medieval glass...
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In the present work the adsorption of some transition metal ions from aqueous solutions on a silica-based nanostructured hybrid material modified by aluminium was investigated. The novel organic-inorganic material was synthesized via a sol-gel method through hydrolysis and co-condensation reactions. Its structure was characterized by means of SEM,...
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In the present work the adsorption of lead from aqueous solutions on a novel nanostructured di-urethanesil hybrid material modified by aluminium was investigated. The adsorption properties of this material with respect to Pb(II) ions from single-component aqueous solutions and multi-component aqueous solutions containing also Cu(II), Cr(III), Cd(II...
Article
This paper discusses the microstructure and stability of medieval glass bracelets from 11th–13th cent. AD excavated in Drastar Castle, Bulgaria. All considered fragments represent high-magnesia soda–lime–silica glasses. Their chemical composition is determined by classical wet chemical analysis. Samples are investigated by infrared spectroscopy, X-...
Article
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In the present work fragments of a colourless Roman flat window glass and coloured medieval glass bracelets excavated in the regions of Pernik and Silistra (Bulgaria) are studied. Data on the coordination of some colouring elements in the glasses are obtained by molecular absorption spectrometry of solid samples. The content of typical colouring an...
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12 In the present study model glasses using technical raw materials are prepared and investigated. The chemical composition of these glasses is identical with the composition of medieval archaeological glasses excavated in Stambolovo-necropolis and Mezek-castle (Haskovo region). Heat treatment of model batches was performed by three different tempe...
Article
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Since ancient times glass was used for manufacturing of glass jewelry. Object of our study were medieval glass bracelets from XI–XIII AD excavated in Drastar–castle (Silistra, Bulgaria). Weight chemical analysis was applied for sil-ica assessment. The other oxides were determined by flame photometry (sodium and potassium) or flame atomic absorption...
Article
Full-text available
Since ancient times glass was used for manufacturing of glass jewelry. Object of our study were medieval glass bracelets from XI–XIII AD excavated in Drastar–castle (Silistra, Bulgaria). Weight chemical analysis was applied for sil-ica assessment. The other oxides were determined by flame photometry (sodium and potassium) or flame atomic absorption...
Article
Full-text available
The aim of this study is to carry out investigations in order to establish the composition and technological behaviour of the Roman glass dated from IV to VI c. For this reason the glass transition temperature (Tg) at 380 °C, the softening point at 490 °C and crystallization ability were determined. The fragment has been investigated by a classical...

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