George Kaptay
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View article: Green reverse water gas shift reaction achieved by microwave-induced plasma
Green reverse water gas shift reaction achieved by microwave-induced plasma Open
The reverse water-gas shift (RWGS) reaction is a promising route to produce syngas that is a valuable precursor for synthetic fuel production. However, this reaction is possible only using catalysts. In this study the catalyst is replaced …
View article: Carbon dioxide conversion and characterization of microwave-induced plasma
Carbon dioxide conversion and characterization of microwave-induced plasma Open
Microwave-induced non-thermal plasma technology is a promising solution to dissociate carbon dioxide, opening the possibility of carbon dioxide upgrade to value-added products and therefore providing an attractive approach in recent decarb…
View article: Impregnation Dynamics of Liquid Resins into Rectangular Capillaries Formed by Polymer‐Coated Copper Hairpins in Electric Motors: Experiments and Theory
Impregnation Dynamics of Liquid Resins into Rectangular Capillaries Formed by Polymer‐Coated Copper Hairpins in Electric Motors: Experiments and Theory Open
View article: Impregnation Dynamics of Liquid Resins into Rectangular Capillaries Formed by Polymer‐Coated Copper Hairpins in Electric Motors: Experiments and Theory
Impregnation Dynamics of Liquid Resins into Rectangular Capillaries Formed by Polymer‐Coated Copper Hairpins in Electric Motors: Experiments and Theory Open
Herein, the impregnation dynamics of the space between rectangular, polymer‐coated copper hairpins in electric motors, using polyester‐based and epoxy‐based liquid resins, are described both experimentally and theoretically. The rectangula…
View article: Comparison of Different Equations Published for Size- and Shape-Dependent Integral and Partial Molar Gibbs Energies of Nano-Phases to Screen Out the Incorrect Equations
Comparison of Different Equations Published for Size- and Shape-Dependent Integral and Partial Molar Gibbs Energies of Nano-Phases to Screen Out the Incorrect Equations Open
View article: Microwave-Induced Plasma as a Physical Catalyst for Reverse Water Gas Shift Reaction
Microwave-Induced Plasma as a Physical Catalyst for Reverse Water Gas Shift Reaction Open
View article: The Generalized Phase Rule, the Extended Definition of the Degree of Freedom, the Component Rule and the Seven Independent Non-Compositional State Variables: To the 150th Anniversary of the Phase Rule of Gibbs
The Generalized Phase Rule, the Extended Definition of the Degree of Freedom, the Component Rule and the Seven Independent Non-Compositional State Variables: To the 150th Anniversary of the Phase Rule of Gibbs Open
The phase rule of Gibbs is one of the basic equations in phase equilibria. Although it has been with us for 150 years, discussions, interpretations and extensions have been published. Here, the following new content is provided: (i). the c…
View article: On the size- and shape-dependence of integral and partial molar Gibbs energies, entropies, enthalpies and inner energies of solid and liquid nano-particles
On the size- and shape-dependence of integral and partial molar Gibbs energies, entropies, enthalpies and inner energies of solid and liquid nano-particles Open
In this paper the size- and shape dependences of 8 different integral and partial molar thermodynamic quantities are derived for solid and liquid nano-phases, starting from the fundamental equation of Gibbs: i) The integral molar Gibbs ene…
View article: On the temperature dependence of surface tension: Historical perspective on the Eötvös equation of capillarity, celebrating his 175th anniversary
On the temperature dependence of surface tension: Historical perspective on the Eötvös equation of capillarity, celebrating his 175th anniversary Open
The Hungarian baron Roland Eötvös (Eötvös Loránd, 1848-1919) lived in the difficult period between two revolutions in Hungary, but nevertheless he achieved revolutionary results in two fields of science: capillarity (1875-1886) and gravity…
View article: An Improved Model for Molar Volumes of Ti-Carbide, Ti-Nitride and Ti-Carbo-Nitride
An Improved Model for Molar Volumes of Ti-Carbide, Ti-Nitride and Ti-Carbo-Nitride Open
Molar volume of titanium carbonitride is modelled as function of composition and temperature by two-sublattice model Ti 1 (C, N, Va) 1 . Deviations from the ideal solution model in Ti–TiX sections were modelled by regular solution model be…
View article: Experimental and theoretical aspects of the growth of vertically aligned CNTs by CCVD on AZO substrate
Experimental and theoretical aspects of the growth of vertically aligned CNTs by CCVD on AZO substrate Open
An efficient and reproducible growth of vertically aligned carbon nanotubes by CCVD requires accurate and specific setting of the synthesis parameters and the properties of catalyst thin layers. In this work, the growth of vertically align…
View article: A „capillaritási tünemények”, azaz Eötvös kapilláris egyenlete és annak háttere • The “Capillarity Phenomena”: On Eötvös’s Capillary Equation and Its Historical Background
A „capillaritási tünemények”, azaz Eötvös kapilláris egyenlete és annak háttere • The “Capillarity Phenomena”: On Eötvös’s Capillary Equation and Its Historical Background Open
Miután hazatért Heidelbergben folytatott tanulmányai után, báró Eötvös Loránd a Műegyetemen 1876-ra elkészült új, reflexiós mérőműszerével, amellyel folyadékok kritikus hőmérsékletét, illetve felületi feszültségük és sűrűségük hőmérsékletf…
View article: On the Corrected Inden-Hillert-Jarl Model for Molar Gibbs Energy of One-Component Magnetic Phases for 3rd Generation Calphad
On the Corrected Inden-Hillert-Jarl Model for Molar Gibbs Energy of One-Component Magnetic Phases for 3rd Generation Calphad Open
View article: Wetting Transition of Liquid Tin on the Surfaces of Initially Oxidized Steels
Wetting Transition of Liquid Tin on the Surfaces of Initially Oxidized Steels Open
Experiments were carried out to investigate the wetting behaviour of liquid tin on two different steel substrates EN1.4301 stainless steel and 42CrMo4 low-alloyed steel. The experiments were carried out in a vacuum furnace at residual pres…
View article: Beyond the Parallel Tangent Method to Predict the Composition of the First Nucleating Phase from Oversaturated Solutions
Beyond the Parallel Tangent Method to Predict the Composition of the First Nucleating Phase from Oversaturated Solutions Open
The parallel tangent method widely applied to predict the composition and driving force to form a nucleus from an oversaturated solution is extended in this paper. The parallel tangent method is shown to (i) Over-estimates the composition …
View article: Investigations on Thermal Conductivity of Two-Phase WC-Co-Ni Cemented Carbides through a Novel Model and Key Experiments
Investigations on Thermal Conductivity of Two-Phase WC-Co-Ni Cemented Carbides through a Novel Model and Key Experiments Open
Excellent thermal conductivity is beneficial for the fast heat release during service of cemented carbides. Thus, thermal conductivity is a significant property of cemented carbides, considerably affecting their service life. Still, there …
View article: Review of: "Measuring researchers’ success more fairly: going beyond the H-index"
Review of: "Measuring researchers’ success more fairly: going beyond the H-index" Open
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View article: Identification of Nano-Metal Oxides That Can Be Synthesized by Precipitation-Calcination Method Reacting Their Chloride Solutions with NaOH Solution and Their Application for Carbon Dioxide Capture from Air—A Thermodynamic Analysis
Identification of Nano-Metal Oxides That Can Be Synthesized by Precipitation-Calcination Method Reacting Their Chloride Solutions with NaOH Solution and Their Application for Carbon Dioxide Capture from Air—A Thermodynamic Analysis Open
Several metal oxide nanoparticles (NPs) were already obtained by mixing NaOH solution with chloride solution of the corresponding metal to form metal hydroxide or oxide precipitates and wash—dry—calcine the latter. However, the complete li…
View article: Extension of the Butler Equation to Materials with Sub-Lattices: Modelling Molar Volumes and Surface Energies of Ti-Carbide, Ti-Nitride and Ti-Carbo-Nitride
Extension of the Butler Equation to Materials with Sub-Lattices: Modelling Molar Volumes and Surface Energies of Ti-Carbide, Ti-Nitride and Ti-Carbo-Nitride Open
View article: On the Electrochemical Diagrams Showing Equilibrium Cathodic Phases and Their Compositions as Function of Electrolyte Composition and Type of Alloy Phase Diagram
On the Electrochemical Diagrams Showing Equilibrium Cathodic Phases and Their Compositions as Function of Electrolyte Composition and Type of Alloy Phase Diagram Open
View article: A Calphad-Type Modeling for Molar Volumes of Ticz, Tinz and Ti(C, N)Z
A Calphad-Type Modeling for Molar Volumes of Ticz, Tinz and Ti(C, N)Z Open
View article: Manipulation of the thermal conductivity for two-phase WC-Ni composites through a microstructure-based model along with key experiments
Manipulation of the thermal conductivity for two-phase WC-Ni composites through a microstructure-based model along with key experiments Open
Thermal conductivity, one of critical properties for composite materials, constitutes an indispensable part of high-efficient materials design. However, a quantitative model to describe the thermal conductivity of two-phase composites has …
View article: Synthesis and characterization of calcium oxide nanoparticles for CO2 capture
Synthesis and characterization of calcium oxide nanoparticles for CO2 capture Open
In this paper, the preparation of calcium oxide (CaO) nanoparticles (NPs) is reported by a precipitation method, using CaCl 2 and NaOH as starting raw materials. The produced NPs were characterized for chemical composition, phase compositi…
View article: On formation of intermetallic compounds at the Copper /Niobium-Titanium interface
On formation of intermetallic compounds at the Copper /Niobium-Titanium interface Open
Temperature dependence of the formation of harmful, very brittle Cu-Ti intermetallic phases at the Cu/Nb-Ti interface was studied by annealing the samples for 2 h. Lamellar structured Cu/Nb-Ti diffusion couples were created and subjected t…
View article: Boride Coatings on Steel Protecting it Against Corrosion by a Liquid Lead-Free Solder Alloy
Boride Coatings on Steel Protecting it Against Corrosion by a Liquid Lead-Free Solder Alloy Open
The goal of this research is to study the applicability of the diffusion boriding process as a high-temperature thermochemical heat treatment to enhance the lifetime of steel selective soldering tools. The main purpose of the work is to di…
View article: On Interfacial Energy, Elastic Energy, Morphology and Stability of Strained Coherent Nano-Particles Upon Their Nucleation and Coarsening in a Solid Matrix
On Interfacial Energy, Elastic Energy, Morphology and Stability of Strained Coherent Nano-Particles Upon Their Nucleation and Coarsening in a Solid Matrix Open
View article: On Formation of Intermetallic Compounds at the Cu/Nb-Ti Interface
On Formation of Intermetallic Compounds at the Cu/Nb-Ti Interface Open
View article: Spontaneous inversion of the submicron ceramic layer deposited on steel and the copper droplet positioned on their top (case of ceramic poorly wetted by liquid Cu)
Spontaneous inversion of the submicron ceramic layer deposited on steel and the copper droplet positioned on their top (case of ceramic poorly wetted by liquid Cu) Open
In this paper, 50 … 680 nm thick AlN-Al 2 O 3 coatings are deposited by magnetron sputtering on the surface of a steel substrate and a piece of copper is melted on top of the ceramic. Upon heating the ceramic layer is cracked, and the phas…
View article: A magyar egyetemek QS-2022 rangsorának elemzése
A magyar egyetemek QS-2022 rangsorának elemzése Open
Jó lenne, ha rendelkeznénk a világ egyetemeinek objektív minőségi sorrendjét ismertető táblázattal. Azt, hogy ilyennel nem rendelkezünk, itt a QS rangsor példáján mutatjuk be. Ebben a cikkben megvizsgáljuk, hogy milyen összetevői vannak a …
View article: On Interfacial Energy, Elastic Energy, Morphology and Stability of Strained Coherent Nano-Particles Upon Their Nucleation and Coarsening in a Solid Matrix
On Interfacial Energy, Elastic Energy, Morphology and Stability of Strained Coherent Nano-Particles Upon Their Nucleation and Coarsening in a Solid Matrix Open