Adriana Asenova Georgieva

@btu.bg

Department of Chemical technology, Faculty of Technical science
Bourgas Prof. Assen Zlatarov University

https://researchid.co/adrianageorgieva

RESEARCH INTERESTS

Chemical engineering, Mechanic of fluids, Heat and Mass transfer, Nanotechnology, Nanoparticles

Scopus Publications

Scholar Citations

Scholar h-index

Scopus Publications

LOW-TEMPERATURE SYNTHESIS OF FINE-POROUS CORUNDUM BASED ON INCORPORATED GRAPHENE NANOSTRUCTURES
Adriana Asenova Georgieva, Fila Slavova Yovkova, Margarita Anatolievna Georgieva, and Irena Georgieva Markovska
University of Chemical Technology and Metallurgy
In the present paper, the effect of the addition of graphene nanostructures and 3 mass % TiO2 on the microstructure and properties of sintered corundum ceramics were studied. Fine-porous corundum ceramics were obtained by the method of solid-phase sintering at relatively low temperatures of 1450oC, by adding graphene nanostructures in an amount of 2 % or 20 %. To lower the synthesis temperature, 3 mass % TiO2 was added to the initial ceramic blends. As a result of the solid solution formed between Al2O3 and TiO2, a well-sintered corundum ceramic is obtained at synthesis temperature lower than that of pure corundum - 1450oС. For the characterization of the initial blends and the ceramic samples, the methods of X-ray phase analysis, infrared spectroscopy, SEM, TEM EDS and visual microscopy were used. Besides, the basic physicochemical properties of the samples synthesized based on corundum were determined, e.g. water absorption (WA, %), apparent density (AD, %) and apparent (open) porosity (Pa, %).

OBTAINING OF GARNET CERAMIC MATERIALS BY UTILIZATION OF RICE HUSK ASH AS SILICA SOURCE
Mariela Ganeva Minova, Adriana Asenova Georgieva, Tsvetan Ivanov Dimitrov, Fila Slavova Yovkova, and Irena Georgieva Markovska
University of Chemical Technology and Metallurgy
The current research aims at the obtaining of new type pigments from the garnet mineral group by utilizationof rice husk ash as silica source (RHA). At the beginning, the mixtures prepared from the starting raw materials areground in a ball mill and then subjected to high temperature treatment. Green pigments were synthesized at twotemperatures: 1000°C and 1100°C. Using the tintometer RT 100 Lovibond the colour characteristics were measuredspectrophotometrically. The rice husk ash was investigated using scanning electron microscopy. The conducted hot-stage microscopic studies show that the pigments remain thermally stable when heated. The highest fire resistance - upto temperatures of 1380°C - 1400°C show the uvarovite pigments with main phase 3CaO.Cr2O3.3SiO2 or by a generalformula Ca3Cr2[SiO4 ]3. They are suitable for inserting into ceramic glazes without danger of decomposition or reaction.Keywords: ceramic pigments, SEM, colour determination, Hot-stage microscopy.

USING THE ADVANTAGES OF NANOTECHNOLOGY FOR THE PRODUCTION OF COMPOSITE MATERIALS OF THE TYPE NGO/CERAMIC MATRIX
Adriana Asenova Georgieva, Margarita Anatolievna Georgieva, Fila Slavova Yovkova, Krasi Zlatinova Panayotova, and Irena Georgieva Markovska
University of Chemical Technology and Metallurgy
Using the advantages of nanotechnology, composite ceramic materials of the type of graphene oxide nanocolloid/ceramic matrix were obtained in two stages. First, finely porous corundum (1500ºC) and barium titanate (1300ºC)ceramic samples containing 2 mass % graphene structures nanoplatelets were synthesized. The next stage of the study involved the preparation of graphene oxide in nanocolloid form (2 mg/ml, dispersion in H2O) which was impregnated in the solid porous ceramic samples to obtain composite materials. For the characterization of the ceramic samples, mainly infrared spectroscopy, X-ray phase analysis, scanning electron microscopy and light microscopy were used. The results obtained from the studies carried out showed that with the introduction of small amount of graphene nanoplatelets in the initial blends followed by solid state sintering, part of the added graphene is burned out which imparts significant porosity to the ceramics obtained. On the other hand, the addition of graphene initiates the formation of well-shaped fine-grain structure of the ceramic samples, and they had sufficient porosity.

OBTAINMENT OF BARIUM TITANATE CERAMIC SAMPLES AND DETERMINATION OF THEIR BASIC PHYSICOCHEMICAL PROPERTIES

Preparation and characterization of NGO/Al<inf>2</inf>O<inf>3</inf> composite ceramic materials

SYNTHESIS AND PROPERTIES OF CHROMIUM-BASED GARNET PIGMENTS

Experimental determination of mass transfer coefficient by rectification in a laboratory column equipped with three sieve trays

Obtaining nanostructured catalyst systems and study of catalytic efficiency

Determination of Interphase surface by rectification process in a laboratory column

RECENT SCHOLAR PUBLICATIONS

OBTAINING OF GARNET CERAMIC MATERIALS BY UTILIZATION OF RICE HUSK ASH AS SILICA SOURCE
MG Minova, AA Georgieva, TI Dimitrov, FS Yovkova, IG Markovska
Journal of Chemical Technology and Metallurgy 59 (6), 1461-1468 2024

LOW-TEMPERATURE SYNTHESIS OF FINE-POROUS CORUNDUM BASED ON INCORPORATED GRAPHENE NANOSTRUCTURES
AA Georgieva, FS Yovkova, MA Georgieva, IG Markovska
Journal of Chemical Technology and Metallurgy 59 (6), 1415-1420 2024

USING THE ADVANTAGES OF NANOTECHNOLOGY FOR THE PRODUCTION OF COMPOSITE MATERIALS OF THE TYPE NGO/CERAMIC MATRIX
AA Georgieva, MA Georgieva, FS Yovkova, KZ Panayotova, IG Markovska
Journal of Chemical Technology and Metallurgy 59 (6), 1399-1405 2024

OBTAINMENT OF BARIUM TITANATE CERAMICSAMPLES AND DETERMINATION OF THEIR BASICPHYSICOCHEMICAL PROPERTIES
KZP A. A. GEORGIEVA*, F. S. YOVKOVA, M. A. GEORGIEVA
Oxidation Communications 46 (No 2), 450–458 2023

Preparation and characterization of NGO/Al2O3 composite ceramic materials
IGM M. A. Georgieva, A. A. Georgieva, K. Z. Panayotova, F. S. Yovkova
Bulgarian Chemical Communications DOI: 10.34049/bcc.55.3.SIMNS04 55 (3 2023

SYNTHESIS AND PROPERTIES OF CHROMIUM-BASED GARNET PIGMENTS
F Yovkova, M Minova, T Dimitrov, A Georgieva, M I.
Journal of Chemical Technology and Metallurgy 58 (1), 68-74 2023

OBTAINING OF GRAPHENE’S INCORPORATED CORUNDUM CERAMICS
M Georgieva, A Georgieva, F Yovkova, K Panayotova
PROCEEDINGS OF UNIVERSITY OF RUSE - 2022 61 (book 10.1 Chemical technologies 2022

CERAMIC PIGMENTS BASED ON THE MINERAL MULLITE /3AL2O3.2SO2/
F Yovkova, M Minova, T Dimitrov, A Georgieva
PROCEEDINGS OF UNIVERSITY OF RUSE - 2022 61 (book 10.1 Chemical technologies 2022

MULLITE CERAMIC PIGMENTS OBTAINED FROM BIOWASTE - RICE HUSK
F Yovkova, M Minova, T Dimitrov, A Georgieva
PROCEEDINGS OF UNIVERSITY OF RUSE - 2022 61 (book 10.1 Chemical technologies 2022

POSSIBILITIES FOR THE PREPARATION OF CERAMIC MATERIALS INCORPORATING GRAPHENE AND CARBONATE NANOSTRUCTURES
A Georgieva, F Yovkova, K Panayotova, M Georgieva, M Minova
PROCEEDINGS OF UNIVERSITY OF RUSE - 2022 61 (book 10.1 Chemical technologies 2022

A possibility for utilization of biowaste through synthesis of garnet pigments of CaO-Fe2O3- SiO2 system,9th International Conference on Sustainable Solid
MG Minova, FS Yovkova, TI Dimitrov, AA Georgieva, IG Markovska
9th International Conference on Sustainable Solid Waste Management,Corfu 2022 2022

EXPERIMENTAL DETERMINATION OF MASS TRANSFER COEFFICIENT BY RECTIFICATION IN A LABORATORY COLUMN EQUIPPED WITH THREE SIEVE TRAYS.
A Georgieva, Z Ivanov, K Panayotova
Oxidation Communications 42 (2) 2019

Obtaining nanostructured catalyst systems and study of catalytic efficiency
A Georgieva, K Panayotova, ZH IVANOV
Oxidation Communications 42 (2), 121-131 2019

Determination of Interphase surface by rectification process in a laboratory column
Z Ivanov, A Georgieva, K Panayotova
Oxidation Communications 41 (3), 365-371 2018

Нанотехнология на карбонатни наноструктури - получаване, свойства и моделиране
АА Георгиева
https://www.meridian27.com/author/adriana-georgieva 2017

Microemulsion water in oil (w/o)-evaluation of the surface tension forces and study the influence of some factors on the size of carbonate formed nanostructures
A Georgieva, K Panayotova, J Ivanov
International Journal of Engineering Technology and Scientific Innovation 2 2017

TURBULENCE MODELS COMPARISON FOR EXTERNAL FLOWS WITH HIGH-REYNOLDS NUMBER AROUND FLAT OBJECT
D Georgiev, Z Ivanov, A Georgieva
Science & Technologies 6 (3), 95-102 2016

Study of the effect of surface tension and its influence on specific interfacial area in distillation laboratory column
Z Ivanov, M Karaivanova, D Georgiev, A Georgieva
Science & technologies, VI 4, 42-47 2016

Microemulsions–properties, application and perspectives,"
A Georgieva, K Panayotova, B Bogdanov, Z Stefanov
Science & Technologies 2 (4), 1-5 2012

EFFECT OF PHYSICOCHEMICAL PROPERTES OF THE SEPARATED MIXTURE ON THE LOCAL EFFICIENCY BY RECTIFICATION
M Karaivanova, A Georgieva, D Koleva
Science & Technologies, II 26 2012

MOST CITED SCHOLAR PUBLICATIONS

Microemulsion water-in-oil (W/O)—microreactor for synthesis of ultrafine carbonate nanostructures
A Georgieva, B Georgieva, Z Bogdanov, DK Stefanov
University of Ruse Union of Scientists-Ruse 50 (9), 34-38 2011
Citations: 9

Nano-sized BaCO3 particles–a study the effects of the physicochemical conditions on the synthesis in a water in oil microemulsion systems
A Georgieva, C Karagiozov, J Ulrich, B Bogdanov, Y Denev
transport phenomena 1, 13 2010
Citations: 9

Microemulsions–properties, application and perspectives,"
A Georgieva, K Panayotova, B Bogdanov, Z Stefanov
Science & Technologies 2 (4), 1-5 2012
Citations: 6

Determination of Interphase surface by rectification process in a laboratory column
Z Ivanov, A Georgieva, K Panayotova
Oxidation Communications 41 (3), 365-371 2018
Citations: 5

Obtaining nanostructured catalyst systems and study of catalytic efficiency
A Georgieva, K Panayotova, ZH IVANOV
Oxidation Communications 42 (2), 121-131 2019
Citations: 4

Разработване на методика за получаване на карбонатни наноразмерни частици в обратна микроемулсионна система,“Химични, биохимични технологии и опазване на околната среда
A Георгиева, Б Богданов
Школа 10, 12.11 2011
Citations: 3

SYNTHESIS AND PROPERTIES OF CHROMIUM-BASED GARNET PIGMENTS
F Yovkova, M Minova, T Dimitrov, A Georgieva, M I.
Journal of Chemical Technology and Metallurgy 58 (1), 68-74 2023
Citations: 2

A study the effect of the concentration of the initial solutions of reagents in the synthesis of monodispersed nano-sized particles of BaCO3 in a reverse microemulsion system
A Slavova, C Karagiozov, B Bogdanov
Annual Assen Zlatarov University, Bourgas 35, 1 2006
Citations: 2

CERAMIC PIGMENTS BASED ON THE MINERAL MULLITE /3AL2O3.2SO2/
F Yovkova, M Minova, T Dimitrov, A Georgieva
PROCEEDINGS OF UNIVERSITY OF RUSE - 2022 61 (book 10.1 Chemical technologies 2022
Citations: 1

MULLITE CERAMIC PIGMENTS OBTAINED FROM BIOWASTE - RICE HUSK
F Yovkova, M Minova, T Dimitrov, A Georgieva
PROCEEDINGS OF UNIVERSITY OF RUSE - 2022 61 (book 10.1 Chemical technologies 2022
Citations: 1

TURBULENCE MODELS COMPARISON FOR EXTERNAL FLOWS WITH HIGH-REYNOLDS NUMBER AROUND FLAT OBJECT
D Georgiev, Z Ivanov, A Georgieva
Science & Technologies 6 (3), 95-102 2016
Citations: 1

EFFECT OF PHYSICOCHEMICAL PROPERTES OF THE SEPARATED MIXTURE ON THE LOCAL EFFICIENCY BY RECTIFICATION
M Karaivanova, A Georgieva, D Koleva
Science & Technologies, II 26 2012
Citations: 1

QUANTITATIVE ESTIMATION OF THE HARMFUL EMISSIONS FROM THE TECHNOLOGICAL EQUIPMENT BY THE PROCESSING AND TRANSPORTATION OF PETROLEUM PRODUCTS
A Georgieva, K Panayotova
International Journal of Engineering Technology and Scientific Innovation 2
Citations: 1

ИЗСЛЕДВАНЕ НА НАНОРАЗМЕРНИ ЧАСТИЦИ ОТ НИКЕЛОВ КАРБОНАТ СИНТЕЗИРАНИ ПО МИКРОЕМУЛСИОНЕН МЕТОД
А Георгиева, Б Богданов
Бургас
Citations: 1