Publications
Аll published materials, related to the research activities od LAMAR laboratory, are dedicated on five basic fields of knowledge: 1. - Alternative energy sources, including Solid Oxide Fuel Cells (SOFC); 2. - Materials for supercapacitors and photovoltaic elements; 3. - Sensor elements for environment monitoring; 4. – Ecologically friendly advanced materials for corrosion protection, with self-healing capabilities, including thin layers and coatings and preliminary treatments and coating primers.
1. Scientific Monographs
Hydrogen Technologies and fuel cells
This Chapter comprises all basic aspects, related to the synthesis and the conversion of the hydrogen to thermal and electric energy. The literature review done is divided into: (i) theoretical bases, (ii) innovation aspects and (iii) the practical realization of alternative sources for production of hydrogen on one hand, and the alternative energy sources based on the use of this gas. Its content occupies 49 pages and contains 23 figures. The literature analysis is performed on 141 literature sources, including 16 patents. The Chapter content is divided into 10 subsequent paragraphs, dedicated on the industrial production of hydrogen from: (i) Coals and fossil fuels; (ii) By bio-conversion from biomass; (iii) by electrolysis, and also by (iv) solar and (v) nuclear energy. Because of the serious perspectives of the use of solar energy, this source is analyzed in more detail, and the respective section is subdivided into photoelectrochemical, photothermal, photobiological methods of hydrogen synthesis.
This Chapter continues with classification and detailed description of the basic types of fuel cells. After summarizing of the the basic fuel cells types, the attention is turned to the theoretical bases of the hydrogen conversion to thermal and electric energy. There a subject of special attention were the Proton Exchange Fuel Cells (PEMFC), and the Solid Oxide Fuel Cells (SOFC). The conclusive part of the Chapter is devoted to the innovation aspects and the market perspectives of the hydrogen based energetics.
Biblographic data: V. Kozhukharov, M. Machkova, Chapter 7 – Hydrogen Technologies and Fuel Cell in “Renewable Energy System: Theory, Innovations and Intelligent Applications”Edt. S. Kaplanis & E. Kaplani, NOVA Science Publ., N.Y. USA, m.June (2013) 453-501, ISBN 978-1-624177-41-5.
In the field of the high temperature methods in the nano-technologies, icluding materials recycling
High temperature methods for the synthesis and industrial production of nanomaterials
This Chapter is dedicated on the description of the basic aspects, corresponding to the high temperature synthesis of nanoparticles and nanomaterials and the impact of the applied synthesis regimes and conditions on the characteristics of the obtained products. Its content occupies 76 pages and contains 52 figures, being based on the analysis of 234 literature sources. The Chapter begins with description of the most important segments, related to the industrial production of any product, as a combination of subsequent stages for complete conversion of whatever natural of recycled material to a product with desirable properties. It includes the concepts for the correlation among the applied equipment and conditions of synthesis and the resulting conjunction among the composition, structure form and properties which should be possessed by the obtained product. The introduction part finishes with description of the four basic possible aggregate states of the inorganic matter and the respective transitions among them. There, it is clearly remarked that the liquid and solid states belong to the so called "condensed matter", due to the occurrence of clearly defined structure (i.e. spacial ordering of the elementary particles). Further, the Chapter continues with some non-conventional methods for high temperature synthesis, as follows:
(i) Explosion ignited methods for nanomaterial production, (know also as self-propagation high temperature methods of synthesis), including the production of Detonation Nano Diamonds (DND);
(ii) Plasma induced methods for nanomaterials production, which also includes wlow temperature plasma from gaseous phase and the Plasma Electrochemical Oxidation (PEO);
(iii) Spray pyrolysis methods for production of nano-sized powder materials and thin layered coatings and films, including the possible configurations of the production installations and the versatility of the application fields of the obtained products;
(iv) Laser assisted high temperature methods, including exterior and interior (in the bulk) engravement, the production of glass pearls and fibers from glass tubes;
(v) Vapor and gas phase methods for synthesis and deposition, including internal (IVPO) and external (EVPO) methods of oxidation of evaporated precursors, as well as the Fritch method for growth of metal oxide monocrystrals.
(vi) Hydrothermal and solvothermal methods for nanomaterial synthesis at high temperatures, which contains the basic components of the autoclaves and their work regime stages.
(vii) Nanomaterials synthesis via high temperature treatment of sol-gel derived materials, which summarizes the basic definitions, related to the gels, as a specific class of colloidal systems and the most important factors which predetermine the performance of the products derived from sol-gel systems.
An additional attention is turned to the versatility of this group of synthesis methods, which enables the production of Organically Modified Silicates (OrMoSil) and the Organically Modified Ceramic (OrMoCer) products. The typical advantages and disadvantages of every one group of methods as the fields of applicat5ion of the respective products are described in brief, at the end of each paragraph.
Biblographic data: S. V. Kozhukharov, (2016) High temperature methods for the synthesis and industrial production of nanomaterials PUBLISHED IN: Nanofabrication using Nanomaterials, (eds. Jean Ebothé, Waqar Ahmed), Publisher: One Central Press (OCP), Manchester (UK), ISBN (eBook): 978-1-910086-15-5
The Utilization of Waste Materials in the Glass and Ceramics Industries: Available Approaches and Technological Aspects
The continuously increasing human population and the resulting growth in customer demand, combined with the impoverishment of the natural sources of raw materials and the resulting pollution of the environment impose the need for the efficient recycling of materials in practically all branches of industry. This fact has inspired the composition of the present Chapter. It is written on 114 pages and contains 56 Figures and 12 Tables. Its content is based on 330 literature sources, predominantly from the recent years. A large part of the cited sourses is inaccessible for the English speaker readers, since their content is translated from Spanish, Portugese, Russian and Bulgarian languages. The Chapter content is subsequently divided into:
1. Introduction: It contains the basic principles, related to the forms of the existence of the matter according to its energy content: (i) plasma, (ii) gaseous, (iii) liquid, and (iv) solid. Further, it remarks that the occurrence of defined structures (as ordering of the elementary particles in the spaces occupied by the solid) is distinguishable feature of the condensed matter. Afterwareds, it describes the basic difference between the vitreous (glass) and crystalline (ceramnic) solids, remarking the possible intermediuate (polycrystalline vitroceramic) materials.
It finishes with descripttion of the conceptual bases, regarding the material production technologies, as conjunction among the used precursors, energy sources, appropriate methods and suitable equipment. Finally, it is remarked that any production process which proceeds through appropriate technological regime, as consequence of production stages and related processes.
2. Glass-Ceramics Synthesis from Agricultural Waste: It accents on the carbon based precursors, obtained from rice husks and shugarcane combustion, as well as bagasse fly ash. In addition, different compositions, like: SrO:Al2O3:SiO2:TiO2; MgO-Al2O3-SiO2 or Al2O3:MgO:Na2O:B2O3, as well as additives, such as Fe2O3, P2O5, MnO, ZnCl2 or NaCl are proposed. Besides the possibility for precise porosity control by preliminary impregnation with these activators, the beneficial effect of surfactants as dioctylphtalate or polyvinyl alcohol are mentioned, as well.
3. Advanced Ceramics Production from Fly Ash and Sewage Sludge: This paragraph begins by description of the Mg-Al-Si-O (i.e. periclase, corundum, cristobalite) system, which enables the production of pavement tiles, building bricks or water filters. It continues with examples for further enhancement of this system by addition of TiO2, La2O3, Ce, Y, and Zr. Besides a special attention is turned to the Bi-containing ceramics, showing various compositions, like Bi2Sr2Ca1-XCeXCu3Oy superconductors. Glassess with extended mechanical strength due to the simultaneous occurrence of quartz (SiO2), anorthite (CaAl2Si2O8), and hematite (Fe2O3) was mentioned, as well.
The obtaining of other phases, like norbergite (Mg3(SiO4)(F,OH)2) phlogopite (KMg3AlSi3O10(F,OH)2), sellaite (MgF2), whitlockite (Ca9P6O24), magnetite (Fe3O4), hematite (Fe2O3), augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 and pargasite NaCa2(Mg4Al)(Si6Al2)O22(OH)2 fractions, are mentioned, as well.
On the other hand, technological approaches as co-precipitation, and hydrothermal synthesis are also presented.
4. Production of Glass-Ceramic Materials from Thermal Power Station Waste: Since the coal fly ash from thermal power stations is also a significant potential source of glass-ceramic precursors with reliable chemical composition reproducibility, it also was object of a special interest. This paragraph begins with its multicomponent composition, which comprises: SiO2, Al2O3, CaO, Na2O, K2O, Fe2O3, TiO2, P2O5, MnO, etc. The possibility for product quality improvement by addition of B2O3, BaO, Sb2O3, V2O5 tand even Al-enriched fly ash and bauxite are mentioned, as well.
On the other hand, the production of geopolymers, based on the annealing of kaolin and the use of fly ash is remarked, as well. Exampes for use of polystyrene, AA7075 aircraft alloy wastes, plastic waste, automobile tires, residual paper pulp, residuals from fermenters and bioreactors, and urban wastewater slag, are mentioned as sources of considerable amounts of ash.
On the other hand, it is appointed that the basic disadvantage of the organic waste incineration, related to contaminants emition can be overame by further combustion in solid oxide fuel cells (SOFC), producing additional energy
5. Production of Glass-Ceramic Materials from the Metallurgical Sector: The reason for this section is that the metallurgical sector could be a remarkable source of fly ash. Indeed, potentially valuable sources of material from the metallurgical sector could be: (i) ore enrichment flotation cells; (ii) blast furnaces; (iii) electric arc furnaces; (iv) finishing surface oxide slag removal; and (v) various scrap materials, etc. This section, is divided into two part, as follows:
5.1. Production of Glass-Ceramic Materials from Aluminum Metallurgy Sector Residuals: It begins with simpe explication of the electric arc furnace function. Along with the examples, like mullite (3Al2O3.2SiO2 or 2Al2O3.SiO2), anorthite (CaAl2Si2O8), faujasite ((Na2,Ca,Mg)3.5[Al7Si17O48]·32(H2O)), sodalite Na8(Al6Si6O24)Cl2 and cancrinite- Na6Ca2[(CO3)2|Al6Si6O24]•2H2O, a special attention is turned to the zeolites as a special class of geopolymers. On the other hand, alternative methods, like isostatic pressing, and the sol-gel method are given. The versatility of the sol-gel method is remarked by examples for its recent applications for synthesis of: corrosion protective coatings, sensor element materials, catalysis and photocatalysis for environmental applications alternative energy source components, optical materials, selective membranes, environment remediation, medical applications, etc.
This section finishes with utilization of SO3, from sintering of gibsum, for sulfuric acid production.
5.2. Utilization of Waste from the Iron and Steel Industrial Sector: The steel industry is a considerable producer of iron and other metals containing minerals (generally oxides) which can be successfully applied in the glass and ceramic industry. After brief description of ythe blast furnace function, this section renders examples, like magnetite (Fe3O4), fayalite (Fe2SiO4), and pyroxene (i.e., partially substituted aluminosilicates), devitrite (Na2Ca3Si6O16), cristobalite (SiO2), or hematite (Fe2O3), as potential precursors.
6. Recycling of Glass-Ceramic Industrial Residuals: This section describes the possibilities to use glass/ceramic wastes or unclassified production in the glass and ceramic plants. It describes some classical methods as ball-milling and even production of nano-particles by disk-milling, as well as some alternative approaches, lile glass pearl production from waste glass fusion spraying. The possibilities for fine size fraction separation by hydrocyclones and spray drying are also shown. Exampes for highly porous decorative glass bricks are given, as well. The color control by addition of Ca (white), Co (blue), Cr (green), and Fe (red) compounds is mentioned.
7. Glass-Ceramic Materials from Spent Catalysts: Especial attention is turnmed to the utilization of catalysts from petrol refineries. A multitude of possible compositions, like: Mg2TiO4, Zn2TiO4, Co2TiO4, Ni2TiO4, Cu2TiO4; MgAl2O4, Mg3CeO4, MgCr1.2Al0.4Fe0.4O4, MgCr1.6Al0.4O4, MgAl2О4, MgCr2О4, FeCr2О4, FeFe2О4, as well as (Mg, Fe)(Al, Ti, Cr, Fe)2О4 solid solutions are given as examples for ceramic pigments from wasted catalysts. Especial attention is turned on the CIE L*, *a, b* and RGB color evaluation systems, because of their importance for pigment characterization.
The Chapter concludes with brief concepts, remarked in the Chapter, remarking the variety of possible waste products as potential precursors for the glass and ceramic industrial branches.
Bibliographic data: Stephan Kozhukharov, Tzvetan Dimitrov, Ester Barrachina Albert, Iván Calvet Roures, Diego Fraga Chiva and Juan Bautísta Carda Castelló, The Utilization of Waste Materials in the Glass and Ceramics Industries: Available Approaches and Technological Aspects, PUBLISHED IN: Recycling and Reuse of Materials, Marcus Holst, and Tilde Kjeldsen, Eds.; NOVA Sci. Publ. (2018) pp. 101-166; ISBN: 978-1-53613-466-4
Access via: https://novapublishers.com/shop/recycling-and-reuse-of-materials/
Spray Pyrolysis as a Versatile Method for Advanced Materials Production. Basic Concepts and Available Applications
This Chapter is devoted to the literature analysis of the actual trends in the field of the industrial Spray Pyrolysis (SP) methods, the basic requirements of the respective equipment and the variety of the possible SP derived materials. It is written on 165 pages and contains 21 figures 1 table and 255 references. It is dedicated on the basic terminology and principles, related to the spray pyrolysis as industrial technological method. The Chapter content is divided into several sections, subsequently connected among themselves. The Chapter begins with the basic definitions, related with the SPS-synthesis of nano-particles and the SPD-deposition of thin layers and coatings, distinguishing them from the rest spray based methods, like spray freezing, spray drying, etc. Further, the description of the respective production stages and processes is assisted by examples from the real industrial practice. Afterwards, the basic types of spray formation units are described, remarking the principle difference among the nozzles, pluverizers, nebulbulizers, injectors and atomizers. In addition, tghe conventional SP techniques are compared with Flame Assisted (FASP) and the Plasma Assisted (PASP) methods, in accordance with the type of the high temperature cameras. The description of the basic operation units is completed by examples of entire SP industrial production installations, working at continuous regime. The explications inside the text are based on real examples of production of bismuth ferrite, barium titanate, indium tin oxide and carbon nanotubes. The SP production of these materials was chosen, because of their exceptional magnetic, photocatalytic, and opto-electric properties. The versatility of the SP derived products is described, as well, mentioning the fields their potential application, as:
(i) Automatics (for instance sensors and detectors)
(ii) Optoelectronics and microelectronics (semiconductor and superconductor layers and particles).
(iii) Alternative Energy Sources (photovoltaic elements, fuel cell components, water splitting devices, supercapacitors, lithium-ion and Zn-air batteries, etc).
(iv) Catalysts and Photocatalysts (remarking their importance so for the organic chemical synthesis, so for pollutant decomposition).
(v) Adsorptive and membrane filters (for environmental and house hold applications).
(vi) Materials for disinfection, etc. Besides, some alternative spray based methods, like for instance: Spray Freezing (SF), Spray Drying (SD) fusion pluverisation (FS) and the и InkJet method are described, as well.
The Chapter comprises all the aspects, corresponding to the specific features of the SP based methods, the distinguishable features of the respective products, at their fields of application. The aim of its composition is to be a valuable tool so for lecture courses, so as a practical manual for the experts in this field.
Bibliographic data: S. Kozhukharov, V. Zhelev, S. Tchaoushev, Chapter 3: Spray Pyrolysis as a Versatile Method for Advanced Materials Production. Basic Concepts and Available Applications, Publisdhed in: Advances in Materials Science Research Vol. 37, Maryann Wythers Ed.; NOVA Sci. Publ. (2019) pp. 101-166; ISBN: 978-1-53615-038-4
Access via: https://novapublishers.com/shop/advances-in-materials-science-research-volume-37/
Advanced Multifunctional Corrosion Protective Coating Systems for Light-Weight Aircraft Alloys - Actual Trends and Challenges
This Chapter is written on 31 pages ans contains 17 figures and 3 tables. The Chapter begins with the importance of the high strengthened, doped alloys for the aircraft industry and the rest transport branches, describing the basic representatives of the Al-Cu-Mg alloys. The second basic topic of the Chapter is related to the nature and the effect of the corrosion phenomena, including a brief classification of the corrosion impact types. It continues with the basic requirements to the modern corrosion protective systems, remarking the definitions for the active and passive corrosion protection and their mechanisms. The next sections re devoted to subsequent description of finishing, the intermediate and the primer coating layers, remarking their specific functions. Each one of these paragraphs accents on the significance of the UV-protection, the hydrophobicity, the self-reparation effects and their mechanisms, as well as the actual tendency for substitution of the already banned Cr (VI) compounds by cerium oxides. Moreover, two modern technological approaches are described: the spray pyrolysis and the Sol-Gel route. A special attention is turned to the of the application of these methods for thin layer deposition and the synthesis of fine dispersed filler of reinforcing fractions. Finally, the conclusion part summarizes the most important aspects, described in the chapter.
Biblographic data: S. V. Kozhukharov, (2017) Chapter 10, Advanced Multifunctional Corrosion Protective Coating Systems for Light-Weight Aircraft Alloys—Actual Trends and Challenges, Published in: Materials Science » "Thin Film Processes - Artifacts on Surface Phenomena and Technological Facets", book edited by Jagannathan Thirumalai, (2017), p. 179 - 210; ISBN 978-953-51-3068-0, Print ISBN 978-953-51-3067-3,
Phenomena and Theories in Corrosion Science, Methods of Prevention
Phenomena and Theories in Corrosion Science, Method of Prevention
Editor:
Andras Gergely, Ph.D.
(University of Twente, Faculty of Engineering
Technology, Department of Applied Mechanics)
ISBN: 978-1-53615-252-4
The Chapter is written on 162 pages and contains 70 figures and 11 tables. Its content is composed on the basis of 524 referenced literature sources, predominantly from the recent years. It is conditionally divided into four basic parts. The first part is dedicated on the basic industrially important low- and high doped Al-alloys, remarking their importance for the aircraft, marine, and automobile transport sectors, the architectonics, and other civil engineering branches. Furthermore, other important fields of the Al-alloys industrial application, like the packaging of nutrition products and soft drinks and the polygraph industry are also mentioned.
The second part is devoted to the transitions of among the basic processes of corrosion and the related phenomena, causing deterioration of the Al-based materials. It begins with the recent concepts, the basic terminology and definitions, related to the corrosion processes. It includes also the description and the general classification of the corrosion processes and the resulting impacts. Thus, the transition from the initial corrosion stages, like: galvanic corrosion and selective dissolution to the stress corrosion cracking and corrosion fatigue. All the possible intermediate stages, like uniform, pitting, intergranular, crevice, and filiform corrosion are described in brief, as well. In addition some rare corrosion forms, such as high temperature oxidation, abrasive wear and propeller cavitation are mentioned, as well.
The third part of the Chapter is related to the description of the electrochemical methods for determination of the corrosion rate. All the method descriptions comprise the basic concepts and terminology, the basic requirements for correct electrochemical test procedure performance, and the respective rules for adequate data interpretation. The electro-analytical method descriptions are ordered in consecutive order, begining from the most simple one (i.e. Open Circuit Potential determination), continuing through the polarization techniques (like potentiostatic, potentiodynamic, galvanostatic and galvanodynamic methods) and the respective altering current techniques (i.e. Electrochemical Impedance Spectroscopy). Further, this section continues with the recently employed electrochemical methods, like: Scanning Vibrating Electrode Technique (SVET), Scanning Kelvin-Probe Force and Scanning Electrochemical Microscopy (SKPFM and SECM, respectively). This paragraph finishes with brief description of other electrochemical methods for corrosion impact determination in conditions of tensile strengthening, and cyclic mechanical loading, as well as some procedures for performance of corrosion tests in conditions of microbiologically active media. In addition, some non-electrochemical analytical methods are described, as well.
The fourth part of the Chapter is dedicated on the use of the most widely used international standards, like: ISO, ASTM, BS, DIN, NF, GOST and BDS. Remarking the great importance of the obtained data repeatibility and reproducibility, this part completes by description of the basic statistic approaches for correct data acquisition, which are applicable for every variable, related to the corrosion rate determination and corrosion impact quantification.
Biblographic data: Stephan V. Kozhukharov and Christian A. Girginov, Chapter 1: Classical and Modern Methods for Corrosion Impact Rate Determination for Aluminium and Strengthened Aircraft Alloys. Fundamentals and Practical Applications, Published in: Phenomena and Theories in Corrosion Science. Methods of Prevention, András Gergely Ed. NOVA Sci. Publ. (2019) p. 3 - 150; ISBN 978-153-615253-1.
Access via: https://novapublishers.com/shop/phenomena-and-theories-in-corrosion-science-methods-of-prevention/
2. Scientific Publications
2013
S. Kozhukharov, M. Machkova, V. Kozhukharov, S.P. Simeonov, Evaluation of the potential application of La2–xSrxCuO4–δ and Nd2–xSrxNiO4–δ as alternative cathode materials for solid oxide fuel cells,Bulgarian Chemical Communications, 45, 2, (2013), 207 – 213
S. Simeonov, S. Kozhukharov, J.-C. Grenier, M. Machkova, V. Kozhukharov, Assessment of Nd2-XSrXNiO4-d as a cathodic material for solid oxide fuel cell applications, Journal of Chemical Technology and Metallurgy, 8, 1, (2013), 104-110
http://www.uctm.edu/journal/j2013-1/14_Stefan_Kojikharov_104-110.pdf
2012
S. Simeonov, S. Kozhukharov, M. Machkova, N. Saliyski, V. Kozhukharov, Innovative methods and technologies for elaboration of sofc ceramic materials (Review),Journal of Chemical Technology and Metallurgy, 47, 5, (2012), 485 – 492
http://www.uctm.edu/journal/j2012-5/1_Simeonov_Kojukharov_485-492.pdf
2005
T. Gerganov, S. Grigorov, S. Kozhukharov, V. Kozhukharov, SOFC: processes and characteristics of ageing behaviour, Proceed. Energy Forum 2005 , 8 -11 June 2005, Varna, Bulgaria, Vol. 1. (2005) 332
2017
Ch. Girginov, S. Veleva, S. Kozhukharov, A. Stoyanova, E. Lefterova, M. Mladenov, R. Raicheff, A comparative study on application of biogenic hematite and magnetite as electrode materials in hybrid supercapacitors, J. Chem. Technol. Metall, Vol. 52, pp. 557 – 563 (2017)
2014
Emil Bubev, Valentin Bozhilov, Stephan Kozhukharov, Maria Machkova, Vladimir Kozhukharov, Flexible uv-absorbing films - deposition and characterization, Materials, Methods & Technologies, Volume 8, (2014) 313-321
http://www.scientific-publications.net/en/article/1000178/
Valentin B. Bozhilov, Emil E. Bubev, Stephan V. Kozhukharov, Maria Machkova, Vladimir Kozhukharov, Christo R. Georgiev, Optical properties of samarium-doped glasses in the system ZnO-B2O3-P2O5,Materials, Methods & Technologies, Volume 8, (2014) 322-327
http://www.scientific-publications.net/en/article/1000179/
2013
V. Bozhilov, S. Kozhukharov, E. Bubev, M. Machkova, V. Kozhukharov, Classification and functional characterization of the basic types of photovoltaic elements, Bulgarian Chemical Communications, Volume 45, Special Issue A, (2013), 17-23
http://www.bcc.bas.bg/BCC_Volumes/Volume_45_Special_A_2013/BCC-45-SE-A-17-23.pdf
Teodora Lyubenova, Diego Fraga, Aitor Rey, Rafael Marti, Stephan Kozhukarov, Juan Carda, Electrical and Morphological study of Mo thin films for solar cell applications,Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 52, 10.1, (2013), 11 – 15
http://conf.uni-ruse.bg/bg/docs/cp13/10.1/10.1-1.pdf .
2012
E. Bubev, S. Kozhukharov, V. Bozhilov, M. Machkova, V. Kozhukharov, Employment of photosensitized TiO2 in photoelectrochemical energetic sources,Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 51, 9.1 (2012), 69 – 73
http://conf.uni-ruse.bg/bg/docs/cp12/9.1/9.1-12.pdf
D. Fraga, R. Martí, T. Lyubenova, L. Oliveira, A. Rey, S. Kozhukharov, J. Carda, Solvothermal synthesis of CZTSSe for photovoltaic technology,Annual proceedings of “Angel Kanchev” University of Ruse (Bulgaria), 51, 9.1 (2012), 46 – 49
http://conf.uni-ruse.bg/bg/docs/cp12/9.1/9.1-8.pdf
V. Bozhilov, S. Kozhukharov, E. Bubev, M. Machkova, V. Kozhukharov, Application of TiO2 and its derivatives for alternative energetic sources,Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 51, 9.1 (2012), 36 –40
2018
Z. Nenova, T. Nenov, S. Kozhukharov and N. Nedev, "Humidity Sensing Elements Based on Si-Bi-O Surface Layers Prepared via a Sol-Gel Method," IEEE Sensors Journal, 18, (17), (2018) 6946-6953; doi: 10.1109/JSEN.2018.2852746
IMPACT FACTOR: 2.617
Nenova, Z., Nedev, N., Kozhukharov, S.,& Nenov, T. (2018), Humidity Sensors Based on Doped Titania-Silica Surface Layers. 20th International Symposium on Electrical Apparatus and Technologies (SIELA)-2018, doi:10.1109/siela.2018.8447168
2017
S. Kozhukharov, Ch. Girginov, O. Kostadinova, Highly ordered AAO layers for various sensor applications, C-43, published in: Advanced Nanotechnologies for Detection and Defence against CBRN Agents, Proceed. NATO advanced study institute on advanced nanotechnologies for defense against CBRN agents, 12-20 September 2017, Sozopol (Bulgaria), pp. 435 – 444.
2016
Zvezditza Nenova, Stephan Kozhukharov, Toshko Nenov, Nedyu Nedeva, Maria Machkova, Combined influence of titania and silica precursors on the properties of thin film humidity sensing elements prepared via a sol–gel method,Sensors and Actuators B 224 (2016) 143-152
IMPACT FACTOR: 4.578
http://www.sciencedirect.com/science/article/pii/S0925400515304767
Zvezditza Nenova, Stephan Kozhukharov, Nedyu Nedev, Toshko Nenov, Humidity sensing properties of sensors based in Ti-Zr-Ce-O surface layers via a sol-gel method, Proceedings of University of Ruse 55 (2016) 24 – 28; http://conf.uni-ruse.bg/bg/docs/cp16/10.1/10.1-6.pdf
2015
Stephan Kozhukharov, Zvezditza Nenova, Toshko Nenov, Nedyu Nedev, Maria Machkova, Humidity sensing elements based on cerium doped titania-silica thin films prepared via a sol-gel method, Sensors and Actuators B 210 (2015) 676 – 684
IMPACT FACTOR: 3.840
http://www.sciencedirect.com/science/article/pii/S0925400515000027
Zvezditza Nenova, Toshko Nenov, Stephan Kozhukharov, Maria Machkova, Humidity Sensing Elements Based on Zn-doped TiO2 Films Prepared via a Sol-gel Method, Materials Science(MEDŽIAGOTYRA), 21, 2. 2015, 191 – 195
IMPACT FACTOR: 0.51
http://www.matsc.ktu.lt/index.php/MatSc/article/view/6244/6908
2013
Kozhukharov, S., Nenova, Z., Nenov, T., Machkova, M., Kozhukharov. V. Influencia de los suplementos de Ce(III)/(IV) sobre las características de los sensores de humedad con capas de TiO2 preparadas mediante el método “sol-gel”, Boletin De la Sociedad Española de Cerámica y Vidrio, 2013, 52, pp. 71 – 78.
IMPACT FACTOR 0.400
http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/viewArticle/1187
Z. P. Nenova, S. V. Kozhukharov, T. G. Nenov, N. D. Nedev, M. S. Machkova, Characterization of humidity sensors with Ce-modified silica films prepared via sol-gel method, Bulgarian Chemical Communications, Volume 45, Special Issue A, (2013), 11-16.
http://www.bcc.bas.bg/BCC_Volume-45-Special_A.html
IMPACT FACTOR 0.320
Zvezditza Nenova, Toshko Nenov, Stephan Kozhukharov, Maria Machkova, Impedance characteristics of thin films humidity sensing elements based on Bi-doped TiO2,Annual proceedings of “Angel Kanchev” University of Ruse (Bulgaria) 52, 9.1. (2013) 42 – 46
http://conf.uni-ruse.bg/bg/docs/cp13/10.1/10.1-8.pdf
2012
Z. Nenova, S. Kozhukharov, T. Nenov, N. Nedev, M. Machkova, Development of sensing elements for humidity by deposition of Ce-doped SiO2 films prepared via a sol-gel method, Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria) 51, 9.1. (2012) 14 – 18
http://conf.uni-ruse.bg/bg/docs/cp12/9.1/9.1-2.pdf
2011
Nenov, Т., S. Kozhukharov, Z. Nenova, M. Machkova, Impact of dopants on the characteristics of thin-film humidity sensor elements. SENSOR+TEST Confereces 2011, 7-9 June 2011, Sensor 2011 – 15thInternational Conference on Sensors and Measurement Technology, Nürnberg. Proceedings, pp.738-743.
http://www.ama-science.org/assets/Review/conference-program.pdf
2017
T. Dimitrov, S. Kozhukharov, N. Velinov, SíntesisdepigmentosdelsistemaFe2O3.SiO2conadicionesde óxidosdeCa, MgoCo, Bol. Soc. Esp. Ceram. Vidrio, Vol. 56, pp. 55 – 63 (2017)
IMPACT FACTOR: 0.560
2016
Mihail Doynov, Tsvetan Dimitrov, Stephan Kozhukharov, Alternative technological approach for synthesis of ceramic pigments by waste materials recycling, Boletin De la Sociedad Española de Cerámica y Vidrio, 55, (2016), 63 – 70.
http://www.journals.elsevier.com/boletin-de-la-sociedad-espanola-de-ceramica-y-vidrio/
IMPACT FACTOR: 0.280
Ester Barrachina Albert, Iván Calvet, Diego Fraga, Stephan Kozhukharov, Study on the mechanical resistance enhancement of porcelain body formulation by binders addition, Proceedings of University of Ruse 55 (2016) 7-11; http://conf.uni-ruse.bg/bg/docs/cp16/10.1/10.1-1.pdf
2015
Ester Barrachina, Jordi Llop, Maria-Dolores Notari, Diego Fraga, Rafael Marti, Ivan Calvet, Aitor Rey, Teodora Lyubenova, Stephan Kozhukharov, Vladimir Kozhukharov, Juan B. Carda, Rheological effect of different deflocculation mechanisms on a porcelain ceramic composition, Journal of Chemical Technology and Metallurgy 50, 4, 2015, 493 – 501
www.dl.uctm.edu/.../21_Ester%20Barrachina_493%20
2013
S. Kozhukharov, S. Tchaoushev, Spray pyrolysis equipment for various applications, Journal of Chemical Technology and Metallurgy, 48, 1, (2013), 111-118
http://www.uctm.edu/journal/j2013-1/15_Stefan_Kojukharov_111-117.pdf
2011
D. Fraga, A. Gyozova, S. Kozhukharov, S. Allepuz, C. Lázaro, V.Trilles, J. Carda, Development of New Ecological Ceramic Tiles by Recycling of Waste Glass and Ceramic Materials,Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 50, 9.1 (2011), 8 – 12
http://conf.uni-ruse.bg/bg/docs/cp11/9.1/9.1-1.pdf
S. Kozhukharov, S. Tchaoushev, Perspectives for development and industrial application of spray pyrolysis method,Annual proceedings of “Angel Kanchev” University of Ruse (Bulgaria), 50, 9.1 (2011), 46 – 50
http://conf.uni-ruse.bg/bg/docs/cp11/9.1/9.1-7.pdf
2009
S. Kozhukharov,Relationship between the conditions of preparation by the sol-gel route and the properties of the obtained products, Journal of the University of Chemical Technology and Metallurgy, 44, 2, (2009) 143-150
http://www.uctm.edu/bg/j2009-2/6_Kojukharov_143-150.pdf
2005
S. Kozhukharov, V. Kozhukharov, S. Artarski, M. Krysteva, Synthesis and development of photoactive membranes for decomposition of volatile organic compounds, Proceed. Application of Nanotechnologies for separation and recovery of volatile organic compounds, 30 -31 May – 01 June 2005, Istanbul, Turkey, Eds. E. Mehmetly, A. Kemperman, V. Kozhukharov, UCTM press (2005) 75-82
S. Kozhukharov, V. Kozhukharov, S. Grigorov, M. Ivanova, Innovative aspects regarding membranes for gas separation: patents state – of the art, Proceed. Application of Nanotechnologies for Separation and Recovery of Volatile Organic Compounds” 30.5.-01.06.2005 Istanbul Turkey Eds. E. Mehmetly, A. Kemperman, V. Kozhukharov, UCTM press (2005) 177-184
T. Gerganov, S. Grigorov, S. Kozhukharov, V. Kozhukharov, SOFC: processes and characteristics of ageing behaviour, Proceed. Energy Forum 2005 , 8 -11 June 2005, Varna, Bulgaria, Vol. 1. (2005) 332
M. Ivanova, V. Kozhukharov, S. Kozhukharov, Zeolite membranes: on their performance and contribution to the environmental problems solution, Proceed. Application of Nanotechnologies for separation and recovery of volatile organic compounds, 30 -31 May – 01 June 2005, Istanbul, Turkey, Eds. E. Mehmetly, A. Kemperman, V. Kozhukharov, UCTM press (2005) 241
2003
M. Krysteva, S. Artarsky, S.Kozhukharov, Disinfection of biologically contaminated water sources by immobilized photosensitizers, Jour. Univ. Chem. Technol. Met. 38 (2003) 793 – 798
2019
S. Kozhukharov, Ch. Girginov, A. Tsanev, M. Petrova, "Elucidation of the Anodization and Silver Incorporation Impact on the Surface Properties of AA1050 Aluminum Alloy", J. Electrochem. Soc. 166 (10), (2019) C231 – C242. http://doi:10.1149/2.0461910jes
IMPACT FACTOR: 2.781
E. Lilov, V.Lilova, Ch. Girginov, S. Kozhuharov, A.Tzanev, D.Yancheva, “Induction periods during anodic polarization of zinc in aqueous oxalic acid solutions” Materials Chemistry and Physics 223 (2019) 727-736. https://doi.org/10.1016/j.matchemphys.2018.11.044
IMPACT FACTOR: 2.296
2018
Katya Ignatova, Stephan Kozhukharov, Momchil Alakushev, Barrier ability and durability of NiCoP coatings in accordance to the content of H3PO3 and NaH2PO2 as phosphorus, Materials Chemistry and Physics, 219 (2018) 175 – 181.
IMPACT FACTOR: 2.296
https://www.sciencedirect.com/science/article/pii/S0254058418306904
S. V. Kozhukharov, Ch. A. Girginov, Comparative electrochemical and topographical elucidation of Anodic Aluminum Oxide (AAO) layers formed on technically pure aluminum (TPA) and AA2024-T3 aircraft alloy, Bul. Chem. Commun. 50-A (2018) 13 – 21.
IMPACT FACTOR: 0.238
http://www.bcc.bas.bg/BCC_Volumes/Volume_50_Special_A_2018/BCC-50-A-2018-13-21-Kozhuharov.pdf
Ch. A. Girginov, S. V. Kozhukharov, M. J. Milanes, Durability of anodic aluminum oxide (AAO) films formed on technically pure AA1050 alloy against corrosion, Bul. Chem. Commun. 50-A (2018) 6 – 12.
IMPACT FACTOR: 0.238
K. N. Ignatova, St. V. Kozhukharov, G. V. Avdeev, I. A. Piroeva, Structure and corrosion resistance of Ni-P, Со-Р and Ni-Co-P alloy coatings, Bul. Chem. Commun. 50-A (2018) 61 – 69.
IMPACT FACTOR: 0.238
Stephan V. Kozhukharov, Christian Girginov Enhancement of the cerium oxide primer layers deposited on AA2024-T3 aircraft alloy by preliminary Enhancement of the cerium oxide primer layers deposited on AA2024-T3 aircraft alloy by preliminary anodization, J. Electrochem. Sci. Eng. DOI: http://dx.doi.org/10.5599/jese.478
D. Kiradzhiyska, R. Mantcheva, Ch. Girginov, S. Kozhukharov, Optoical and color characteristics of porous alumina with electrochemically incorporated silver, J. Chem. Technol. Metall. Vol. 53 (4), (2018) 745-748.
2017
Stephan V. Kozhukharov, Vassil I. Samichkov, Christian A. Girginov, Maria S. Machkova, Actual trends in the elaboration of advanced multifunctional coating systems for the efficient protection of lightweight aircraft alloys, Corrosion Reviews, Volume 35, Issue 6, Pages 383–396, ISSN (Online) 2191-0316, ISSN (Print) 0334-6005, DOI: https://doi.org/10.1515/corrrev-2017-0026.
IMPACT FACTOR: 1.65
Ch. Girginov, S. Veleva, S. Kozhukharov, A. Stoyanova, E. Lefterova, M. Mladenov, R. Raicheff, A comparative study on application of biogenic hematite and magnetite as electrode materials in hybrid supercapacitors, J. Chem. Technol. Metall, Vol. 52, pp. 557 – 563 (2017)
Ch. Girginov , S. Kozhukharov, M. Milanes, M. Machkova, Impact of the anodizing duration on the surface morphology and performance of A2024-T3 in a model corrosive medium, Mater. Chem. Phys. Volume 198, 1, Pages 137–144 (2017).
IMPACT FACTOR: 2.140
2016
S. Kozhukharov, Ch. Girginov, I. Avramova, М. Machkova, Anodic galvanostatic polarization of AA2024-T3 aircraft alloy in conventional mineral acids, Materials Chemistry and Physics, 180 (2016) 301 – 313
IMPACT FACTOR: 2.101
Stephan Kozhukharov, Christian Girginoov, Topological features of phosphate treated specimens of preliminary cerium oxide coated aircraft alloy, International Scientific Conference on Engineering, Technologies and Systems TECHSYS 2017, Technical University – Sofia, Plovdiv branch 18 – 20 May 2017,
Plovdiv, Bulgaria, pp. II-222 – II225; https://www.researchgate.net/profile/Atanaska_Bosakova-Ardenska/publication/317345238_BILATERAL_FILTER_INTEGRATION_INTO_THE_OPEN_SOURCE_SOFTWARE_GELJ/links/59351b70aca272fc5550f4eb/BILATERAL-FILTER-INTEGRATION-INTO-THE-OPEN-SOURCE-SOFTWARE-GELJ.pdf#page=252
Katja Ignatova, Yordanka Marcheva, Stephan Kozhukharov, Influence of NaH2PO2 content on the compositional and morphological characteristics of Ni-Co-Pcoatings deposited at room temperature and potentiostatic conditions, Proceedings of University of Ruse 55 (2016) 12 – 16; http://conf.uni-ruse.bg/bg/docs/cp16/10.1/10.1-2.pdf
Stephan Kozhukharov, Christian Girginov, Ivalina Avramova, Mariano Milanes, Surface Zn-inclusion in phosphate treated cerium conversion coatings deposited on AA2024-T3 aircraft alloy, Proceedings of University of Ruse 55 (2016) 24 – 28; http://conf.uni-ruse.bg/bg/docs/cp16/10.1/10.1-4.pdf
2015
Emad A. Matter, Stephan Kozhukharov, Maria Machkova, Vladimir Kozhukharov Reproducibility of the corrosion parameters for aa2024-t3 aluminium alloy in chloride solution after different preliminary treatment procedures, Journal of Chemical Technology and Metallurgy, 50, 1, 2015, 52-64
http://dl.uctm.edu/journal/node/j2015-1/8_Stefan_Kojuharov_52-64.pdf
S. Kozhukharov, M. Milanes, C. Girginov, M. Machkova, Comparative evaluation of cerium oxide primers electrodeposited on AA2024-T3 and D16 AM aircraft alloys,Materials and Corrosion, DOI: 10.1002/maco.201508635
http://onlinelibrary.wiley.com/doi/10.1002/maco.201508635/abstract
IMPACT FACTOR: 1.37
Stephan Kozhukharov, Zvezditza Nenova, Nedyu Nedev, Toshko Nenov, Sintering temperature effect on the characteristics of Ce-doped Ti-Si-Zr-O surface layers of humidity sensing elements, Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 54, (10.1) 27 - 32
http://conf.uni-ruse.bg/bg/docs/cp15/10.1/10.1-5.pdf
Petya Atanasova, Stephan Kozhukharov, Mariano Milanes, Evaluation of the buffering effect possessed by diluted diammonium hexanitrocerate solutions, Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 54, (10.1) 42 – 46
http://conf.uni-ruse.bg/bg/docs/cp15/10.1/10.1-8.pdf
Stephan Kozhukharov, Mariano Jose Milanes, Christian Girginov, Impact of the inherent structural characteristics of AA2024-T3 and D16 AM aircraft alloys on the cerium oxide primer layers morphology, Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 54, (10.1) 42 – 46
http://conf.uni-ruse.bg/bg/docs/cp15/10.1/10.1-12.pdf
Christian Girginov, Stephan Kozhukharov, Mariano Milanes, Maria Machkova, Impact of the anionic composition parts of conventional acids on the galvanostatic anodic polarization of AA2024-T3 alloy, Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 54, (10.1) 71 – 75
http://conf.uni-ruse.bg/bg/docs/cp15/10.1/10.1-14.pdf
Katya Ignatova, Stephan Kozhukharov, Lyudmil Vladimirov, Mariano Milanes, Impact of the electroplating regime on the chemical composition of Ni-Co-P based coatings in non-complexing acidic electrolyte, Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 54, (10.1) 81 – 85
http://conf.uni-ruse.bg/bg/docs/cp15/10.1/10.1-16.pdf
Christian Girginov, Lozan Stoyanov, Stephan Kozhukharov, Antonia Stoyanova, Mladen Mladenov, Raicho Raicheff, Study on adsorption properties of carbon electrode materials for electrochemical supercapacitors, Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 54, (10.1) 86 – 92
http://conf.uni-ruse.bg/bg/docs/cp15/10.1/10.1-17.pdf
2014
Stephan V. Kozhukharov, Olaia F. Acuña, Maria. S. Machkova, Vladimir S. KozhukharovInfluence of buffering on the spontaneous deposition of cerium conversion coatings for corrosion protection of AA2024-T3 aluminum alloy, Journal of Applied Electrochemistry, 44, (2014), 1093–1105
http://link.springer.com/article/10.1007/s10800-014-0718-7
IMPACT FACTOR: 2.147
2013
E. A. Matter, S. Kozhukharov, M. Machkova, V. Kozhukharov,Electrochemical studies on the corrosion inhibition of AA2024 aluminium alloy by rare earth ammonium nitrates in 3.5% NaCl solutions,Materials and Corrosion 64, (5), (2013), 408–414
http://onlinelibrary.wiley.com/doi/10.1002/maco.201106349/abstract
IMPACT FACTOR: 1.208
D. S. Rodríguez, S. Kozhukharov, M. Machkova, V. Kozhukharov, Influence of the deposition conditions on the properties of D16 AM clad alloy, dip-coated in Ce-containing baths, Bulgarian Chemical Communications, Volume 45, Special Issue A, (2013), 24-32.
http://www.bcc.bas.bg/BCC_Volumes/Volume_45_Special_A_2013/BCC-45-SE-A-24-32.pdf
IMPACT FACTOR 0.320
J. A. P. Ayuso, S. Kozhukharov, M. Machkova, V. Kozhukharov, Electrodeposition of cerium conversion coatings for corrosion protection of D16 AM clad alloy, Bulgarian Chemical Communications, Volume 45, Special Issue A, (2013), 33-40.
http://www.bcc.bas.bg/BCC_Volumes/Volume_45_Special_A_2013/BCC-45-SE-A-33-40.pdf
IMPACT FACTOR 0.320
S. Kozhukharov, J.A.P. Ayuso, D.S. Rodríguez, O.F. Acuña, M. Machkova, V. Kozhukharov, Optimization of the basic parameters of cathodic deposition of Ce-conversion coatings on D16 AM clad alloy, Journal of Chemical Technology and Metallurgy, 48, 3, (2013), 296-307
http://www.uctm.edu/journal/j2013-3/11-Stefan_Kojukharov-296-307.pdf
M. Machkova, E.A. Matter, S. Kozhukharov,V. Kozhukharov, Effect of the anionic part of various Ce(III) salts on the corrosion inhibition efficiency of AA2024 aluminium alloy, Corrosion Science 69, (2013), 396–405
http://www.sciencedirect.com/science/article/pii/S0010938X13000127
IMPACT FACTOR 3.686
Christian Girginov, Stephan Kozhukharov, Impact of the preliminary surface treatment of aluminum on its electrochemical behavior, Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 52, 10.1 (2013), 29-32.
http://conf.uni-ruse.bg/bg/docs/cp13/10.1/10.1-5.pdf
http://www.uctm.edu/journal/j2013-2/4_Stefan_Kojukharov_142-146.pdf
S. Kozhukharov, S. Tchaoushev, Spray pyrolysis equipment for various applications, Journal of Chemical Technology and Metallurgy, 48, 1, (2013), 111-118
http://www.uctm.edu/journal/j2013-1/15_Stefan_Kojukharov_111-117.pdf
2012
J. E. Pernas, S. Kozhukharov, A.A Salves, E. Matter, M. Machkova, Influence of the oxidation state of Ce-ions on the inhibition of AA2024 Alloy corrosion in a model corrosive medium, Journal of the University of Chemical Technology and Metallurgy 47 (3), (2012) 311 – 318
http://www.uctm.edu/journal/j2012-3/11_Kojikharov_311-318.pdf
A. A. Salve, S. Kozhukharov, J. E. Pernas, E. Matter, M. Machkova, A Comparative research on hybrid nano-composite protective primary coatings for AA2024 aircraft alloy, Journal of the University of Chemical Technology and Metallurgy 47 (3), (2012) 319 – 326
http://www.uctm.edu/journal/j2012-3/12%20Kojukharov_319-326.pdf
E.A. Matter, S. Kozhukharov,M. Machkova, V. Kozhukharov, Comparison between the inhibition efficiencies of Ce(III) and Ce(IV) ammonium nitrates against corrosion of AA2024 aluminum alloy in solutions of low chloride concentration, Corrosion Science, 62, (2012), 22–33
http://www.sciencedirect.com/science/article/pii/S0010938X12001576
IMPACT FACTOR 3.686
S. Kozhukharov, V. Kozhukharov,M. Schem M. Wittmar, M. Veith, Protective ability of hybrid nano-composite coatings with cerium sulphate as inhibitor against corrosion of AA2024 aluminium alloy,Progress in Organic Coatings; Volume 73, Issue 1, January (2012), Pages 95-103“
http://www.sciencedirect.com/science/article/pii/S0300944011002578
IMPACT FACTOR 2.577
2011
D. Fraga, A. Gyozova, S. Kozhukharov, S. Allepuz, C. Lázaro, V.Trilles, J. Carda, Development of New Ecological Ceramic Tiles by Recycling of Waste Glass and Ceramic Materials,Annual proceedings of “Angel Kanchev” University of Rousse (Bulgaria), 50, 9.1 (2011), 8 – 12
http://conf.uni-ruse.bg/bg/docs/cp11/9.1/9.1-1.pdf
S. Kozhukharov, S. Tchaoushev, Perspectives for development and industrial application of spray pyrolysis method,Annual proceedings of “Angel Kanchev” University of Ruse (Bulgaria), 50, 9.1 (2011), 46 – 50
http://conf.uni-ruse.bg/bg/docs/cp11/9.1/9.1-7.pdf
Nenov, Т., S. Kozhukharov, Z. Nenova, M. Machkova, Impact of dopants on the characteristics of thin-film humidity sensor elements. SENSOR+TEST Confereces 2011, 7-9 June 2011, Sensor 2011 – 15thInternational Conference on Sensors and Measurement Technology, Nürnberg. Proceedings, pp.738-743.
http://www.ama-science.org/assets/Review/conference-program.pdf
E. Matter, S. Kozhukharov, M. Machkova, SEM & EDS determination of the impact of inhibitor containing corrosive media over the AA2024 superficial morphology, Annual proceedings of “Angel Kanchev” University of Ruse(Bulgaria), 50, 9.1 (2011) 60 – 64,
http://fr.uni-ruse.bg/download/konferencia/konf_2011_9_1.pdf
E. A. Matter, S. Kozhukharov, M. Machkova, V. Kozhukharov “Electrochemical studies on the corrosion inhibition of AA2024 aluminium alloy by rare earth ammonium nitrates in 3.5 % NaCl solutions” Proceeds. 9th European Symposium on El ectro che mical Engine ering (9th ES E E ) 19 – 23 of June 2011 – Chania (Greece) P2.05
Christian Girginov and Stephan Kozhukharov, Surface of Alumina Films after Prolonged Breakdowns in Galvanostatic Anodization,International Journal of Electrochemistry Volume 2011 (2011), Article ID 126726, 5 pages; doi:10.4061/2011/126726
http://www.hindawi.com/journals/ijelc/2011/126726/ref/
S. Kozhukharov, V. Kozhukharov, M. Wittmar, M. Schem, M. Aslan, H.Caparrotti, M.Veith, Protective abilities of nanocomposite pre-treatments containing al2o3 nano-particles loaded by CeCl3, Progress in Organic Coatings, Volume 71, Issue 2, June 2011, Pages 198-205
http://www.sciencedirect.com/science/article/pii/S0300944011000555
IMPACT FACTOR 2.632
E. A. Matter, S. V. Kozhukharov, M. S. Machkova, Effect of preliminary treatment on the superficial morphology and the corrosion behaviour of AA2024 aluminum alloy, Bulgarian Chemical Communications 43, (1), (2011) 23 – 30
IMPACT FACTOR 0.34
2010
Emad Matter, Stephan Kozhukharov, Correlation between preliminary pretreatments and the behaviour of AA2024 – aluminium alloy in 3.5% NaCl model corrosive medium, Annual proceedings of “Angel Kanchev” University of Rousse(Bulgaria), 49, (2010), 14 – 19
http://conf.uni-ruse.bg/bg/docs/cp10/9.1/9.1-2.pdf
Stephan Kozhukharov Emad Matter Comparative evaluation over self-healing effect of hybrid nano-composite pre-treatmentsProceed. First International Conference on Materials for energy 4 – 8 July (2010) Karlsrihe (Germany) B 966 – 968
2009
S. Kozhukharov,Relationship between the conditions of preparation by the sol-gel route and the properties of the obtained products, Journal of the University of Chemical Technology and Metallurgy, 44, 2, (2009) 143-150
http://www.uctm.edu/bg/j2009-2/6_Kojukharov_143-150.pdf
2008
G. Tsaneva, V. Kozhukharov, S. Kozhukharov, M. Ivanova, J. Gerwann, M. Schem, T. Schmidt, Functional nanocomposite coatings for corrosion protectionof aluminum alloy and steel, Journal of the University of Chemical Technology and Metallurgy, 43, 2, 2008, 231-238
http://www.uctm.edu/journal/j2008-2/9_Kojukharov_231.pdf
S.Kozhukharov, G. Tsaneva, V. Kozhukharov, J. Gerwann, M. Schem, T. Schmidt, M. Veith,Corrosion protection properties of composite hybrid coatings with involved nanoparticles of zirconia and ceria, Journal of the University of Chemical Technology and Metallurgy, 43, 1, 2008, 73-80
http://www.uctm.edu/journal/j2008-1/11_Kojucharov_73-80.pdf
V. Kozhukharov, G. Tsaneva, S. Kozhukharov, J. Gerwann, M. Schem, T. Schmidt, M. Veith Corrosion protection properties of nanocomposite hybrid coatings with zirconia and ceria Bulgarian Chemistry and Industry 78 (2007) 23–29
V. Kozhukharov, S. Kozhukharov, G. Tsaneva, J. Gerwann, M. Schem, T. Schmidt, M. Veith, Investigation on the corrosion protection ability of nanocomposite hybrid coatings Bulgarian Chemical Communications, Volume 40, Number 3, 2008 310-318
S. Kozhukharov, V. Kozhukharov, M. Schem, T. Schmidt, M. Wittmar, M. Veith Electrochemical properties of sol-gel deposited oxi-silane coatings for corrosion protection of aluminium alloy proceed 4th Balkan Conference on Glass and Ceramics 29 sept. – 02 Oct. 2008, pp. 166 – 171; ISBN 978-954-629—038-0
E. A. Matter, S. Kozhukharov,Assessment of the self healing abilities of hybrid nano-composite pre-treatments with artificial defects in chloride solution,Nanosci-Nanotech. 11 (2008) 72 – 75
E. A. Matter, S. Kozhukharov,Assessment of the self healing abilities of hybrid nano-composite pre-treatments with artificial defects in chloride solutionNanosci-Nanotech. 11 (2008) 72 – 75