@article{MTMT:33210574, title = {Glass-Ceramic Foams Produced from Zeolite-Poor Rock (Tokaj)}, url = {https://m2.mtmt.hu/api/publication/33210574}, author = {FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN and TIHTIH, Mohammed and Kurovics, Emese and Şahin, Ethem İlhan and Gömze, Antal László and Kocserha, István}, doi = {10.1556/606.2022.00641}, journal-iso = {POLLACK PERIODICA}, journal = {POLLACK PERIODICA: AN INTERNATIONAL JOURNAL FOR ENGINEERING AND INFORMATION SCIENCES}, volume = {18}, unique-id = {33210574}, issn = {1788-1994}, abstract = {This study evaluated the possibility of producing innovative glass-ceramic foams from zeolite-poor rock (Tokaj, Hungary) using alkali-activation and reactive sintering techniques. The composition and morphology of the samples were studied using X-ray diffraction, X-ray fluorescence, scanning electron microscope, and computed tomography techniques. The influence of various sintering temperatures on glass-ceramic foams was examined. It has been observed that zeolite-poor rock has a self-foaming capability. The heat treatment temperature affects the pore size and distribution as well as the technical characteristics of the obtained samples. The resulting glass-ceramic foams possess moderate thermal conductivity ranging from 0.11 to 0.17 W mK-1 and good compressive strength (1.5–4.4 MPa). The produced samples might be utilized for thermal insulation, which would have both economic and environmental advantages.}, year = {2023}, eissn = {1788-3911}, pages = {119-125}, orcid-numbers = {Kurovics, Emese/0000-0001-5669-3318} } @article{MTMT:33210518, title = {Innovative Glass-Ceramic Foams Prepared by Alkali Activation and Reactive Sintering of Zeolite-Poor Rock and Sawdust}, url = {https://m2.mtmt.hu/api/publication/33210518}, author = {FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN and TIHTIH, Mohammed and Kurovics, Emese and Gömze, Antal László and Kocserha, István}, doi = {10.2139/ssrn.4065693}, journal-iso = {SOC SCI RES NETW (SSRN)}, journal = {SOCIAL SCIENCE RESEARCH NETWORK: SSRN}, volume = {1}, unique-id = {33210518}, year = {2022}, eissn = {1556-5068}, orcid-numbers = {Kurovics, Emese/0000-0001-5669-3318} } @CONFERENCE{MTMT:33204709, title = {STUDY OF THE PROPERTIES OF ALUMINUM TITANATE WITH THE ADDITION OF SILICA FUME}, url = {https://m2.mtmt.hu/api/publication/33204709}, author = {Mohammed, Al-Saudi Sarah kareem and Kurovics, Emese and FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN and TIHTIH, Mohammed and Simon, Andrea and Géber, Róbert and Gömze, Antal László}, booktitle = {XXV. Tavaszi Szél Konferencia 2022. Absztraktkötet}, unique-id = {33204709}, abstract = {Materials science research in general and ceramics in particular are evolving at a rapid pace. To achieve the best properties, ceramic technologies today aim to produce superior ceramic products from readily available raw materials. Aluminum titanate ceramic is a composite material mainly used as a refractory material in casting aluminum alloys compared to molten aluminum alloys. It is versatile due to its high melting temperature, excellent chemical resistance, low thermal expansion and excellent thermal shock resistance. In this work, the formation of aluminum titanate was studied by sintering at 1400°C samples prepared from mixtures of 80 wt% alumina and 20 wt% titania with the addition of 5 and 10 wt% silica fume. X-ray diffraction and scanning electron microscopy results show that the addition of silica stabilizes the structure of aluminum titanate Al2TiO5, and the mullite phase appears as a product of alumina Al2O3 and silica SiO2. Mullite has a wide range of applications as it has good mechanical and thermal properties. Silica Fume is a powdery by-product resulting from gasses evaporated during the production of silicon or ferrosilicon alloys. It is a very fine, noncrystalline, spherical powder with a material size up to 0.1µm. The sample with 5 wt% silica fume has the best properties because a small percentage of silica leads to stabilization of the aluminum titanate while improving the microstructure, which consists of small particle sizes, while too high a concentration of silica fume leads to grain growth, which negatively affects mechanical strength. The sample with 5 wt% has low porosity, low water absorption and low thermal conductivity value. This makes it attractive for applications such as thermal barriers, combustion engines and catalyst reference materials}, year = {2022}, pages = {782}, orcid-numbers = {Kurovics, Emese/0000-0001-5669-3318; Géber, Róbert/0000-0002-0973-863X} } @article{MTMT:33188799, title = {Modeling of Modulus of elasticity of Nano-Composite Materials: Review and Evaluation}, url = {https://m2.mtmt.hu/api/publication/33188799}, author = {Kareem, Sarah and S.Al-Ansari, Luay and Gömze, Antal László}, doi = {10.1088/1742-6596/2315/1/012038}, journal-iso = {J PHYS CONF SER}, journal = {JOURNAL OF PHYSICS-CONFERENCE SERIES}, volume = {2315}, unique-id = {33188799}, issn = {1742-6588}, abstract = {To improve the mechanical properties of polymer, the mineral particles are added to produce composite material. For example, the mineral particles are added to polymer to improve the stiffness of polymer because of the higher stiffness of mineral particles. When the micron-sized particles are used in composite usually cause a reduction in impact resistance. On the other hand, adding the nano scale minerals leads to improve the impact and wear properties of the composite materials (nanocomposites). Several factors effect on the mechanical properties of nanocomposites like adhesion between the polymer and nanoparticles. If the interfacial deboning of particles from the matrix decreases, the tensile strength of the composite could be reduced.}, year = {2022}, eissn = {1742-6596} } @article{MTMT:33188723, title = {Influence of layers orientation of graphene stacks in shungite disordered carbon to its integral electrical conductivity}, url = {https://m2.mtmt.hu/api/publication/33188723}, author = {Antonets, I V and Golubev, Ye A and Ignatiev, G V and Shcheglov, V I and Gömze, Antal László and Sun, Shiyong}, doi = {10.1088/1742-6596/2315/1/012039}, journal-iso = {J PHYS CONF SER}, journal = {JOURNAL OF PHYSICS-CONFERENCE SERIES}, volume = {2315}, unique-id = {33188723}, issn = {1742-6588}, abstract = {The map of carbon distribution in the sample of graphene-containing shungite is investigated by the electron microscopy. It is found the large quantity of stacks which are formatted by parallel disposed layers of graphene. The model of electrical conductivity of graphene stack is proposed. This model takes into consideration the arbitrary orientation of layers relatively to the direction of current. It is made the numerical calculation of dependence of conductivity from the orientation of graphene layers. It is found the sharp abatement of conductivity by the orientation of graphene layers relatively to the current direction along the corner near the 45 degree. The obtained peculiarities are explained by the influence of geometrical factor.}, year = {2022}, eissn = {1742-6596} } @article{MTMT:33188662, title = {Comparative study of stages of titanium minerals formation in nature and experiment for “smart” materials industry}, url = {https://m2.mtmt.hu/api/publication/33188662}, author = {Ponaryadov, A and Kotova, O and Sun, S and Kurovics, Emese and FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN and Gömze, Antal László}, doi = {10.1088/1742-6596/2315/1/012009}, journal-iso = {J PHYS CONF SER}, journal = {JOURNAL OF PHYSICS-CONFERENCE SERIES}, volume = {2315}, unique-id = {33188662}, issn = {1742-6588}, abstract = {The economic importance of titanium oxides and hydroxides results in the active development of titanium deposits. Considering world trends in the development of titanium ores and taking into account their mineralogical features, a comparative study of stages of titanium minerals formation in nature (mineralogenesis) and their transformations in technological processing or synthesis (technogenesis) under hydrothermal conditions at the macrolevel (textural), micro-level (structural) and nanoscale (heterogeneity of individuals and microaggregates, including the synthesis of nanostructures) was made. The natural mechanism of mineral formation of titanium ores in the geological system (titanium ore – hydrothermal conditions) have been successfully used to simulate the synthesis of titanium nanotubes: a trigger for the redeposition of ore matter with the formation of new mineral phases and restructuring at the macro-, micro- and nanoscale is the energy of the geological system/its model, which is sufficient to create conditions for inhomogeneiting (destabilizing) the initial structure of titanium minerals due to external influences (P, T, pH). The relationship between the stages of mineral formation processes in nature and experiment as a promising strategy for the “smart” materials industry was discussed.}, year = {2022}, eissn = {1742-6596}, orcid-numbers = {Kurovics, Emese/0000-0001-5669-3318} } @article{MTMT:33108060, title = {Structural, optical, and electronic properties of barium titanate: experiment characterisation and first-principles study}, url = {https://m2.mtmt.hu/api/publication/33108060}, author = {TIHTIH, Mohammed and FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN and Basyooni, Mohamed A. and Belaid, Walid and Gömze, Antal László and Kocserha, István}, doi = {10.1080/10667857.2022.2107473}, journal-iso = {MATER TECHNOL}, journal = {MATERIALS TECHNOLOGY}, volume = {2022}, unique-id = {33108060}, issn = {1066-7857}, year = {2022}, eissn = {1753-5557}, orcid-numbers = {Basyooni, Mohamed A./0000-0001-8473-8253} } @article{MTMT:33064752, title = {Synthesis and characterization of alkali-activated zeolite-poor rocks}, url = {https://m2.mtmt.hu/api/publication/33064752}, author = {FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN and Kurovics, Emese and TIHTIH, Mohammed and Gömze, Antal László and Kocserha, István}, doi = {10.1088/1742-6596/2315/1/012020}, journal-iso = {J PHYS CONF SER}, journal = {JOURNAL OF PHYSICS-CONFERENCE SERIES}, volume = {2315}, unique-id = {33064752}, issn = {1742-6588}, abstract = {Zeolite-geopolymer composite materials were obtained through mechanical activation using planetary ball mill followed by chemical activation using an aqueous solution of sodium hydroxide (NaOH), these materials integrate the beneficial features of both zeolites and geopolymers. In this present work, the morphological characteristics, microstructure, phase determination of raw materials and the generated ceramic samples were studied by several characterization methods such as SEM, EDS and XRD. The microstructural analysis confirms the formation of needle-like structure in sub-micron and nanostructure, while the phase identification reveals the creation of single-phase zeolite (heulandite).}, year = {2022}, eissn = {1742-6596}, orcid-numbers = {Kurovics, Emese/0000-0001-5669-3318} } @article{MTMT:33062506, title = {Innovative glass-ceramic foams prepared by alkali activation and reactive sintering of clay containing zeolite (zeolite-poor rock) and sawdust for thermal insulation}, url = {https://m2.mtmt.hu/api/publication/33062506}, author = {FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN and TIHTIH, Mohammed and Kurovics, Emese and Gömze, Antal László and Kocserha, István}, doi = {10.1016/j.jobe.2022.105160}, journal-iso = {J BUILDING ENG}, journal = {JOURNAL OF BUILDING ENGINEERING}, volume = {59}, unique-id = {33062506}, abstract = {Energy-saving through thermal insulation of the buildings is becoming extremely important recently, addressing sustainability-connected challenges. This work addresses the potential for producing innovative glass-ceramic foams from zeolite-poor rock and sawdust using alkali activation and reactive sintering techniques. A comprehensive analysis has been conducted for the detailed characterization of raw materials as well as the produced samples. The starting raw materials and the produced samples were investigated based on their chemical constituents, particle size distribution, BET (Brunauer, Emmett and Teller), X-ray diffraction (XRD), X-ray fluorescence (XRF), energy-dispersive X-ray spectroscopy (EDS), thermogravimetric (TG), differential thermal analysis (DTA), scanning electron microscopy (SEM) and computed tomography (CT). The alkali activation and the mechanism of foaming were systematically discussed. The optimal sintering temperature and the maximum expansion percentage are evaluated using heating microscopy. The findings show that the used alkali-activated raw mixtures have excellent foamability at 850–950 °C. The influence of the sawdust content and sintering temperatures on different technical characteristics such as bulk density, volume expansion, compressive strength, thermal conductivity, morphologies, phase identification, and microstructural properties of the sintered samples were thoroughly examined. The SEM and CT analysis of the produced specimens reveals the formation of foams with different types of pore sizes and distribution. The produced glass-ceramic foams have compressive strengths ranging from 0.3–4.5 MPa and thermal conductivities ranging from 0.058 to 0.178 W/mK. Development of these value-added glass-ceramic foams utilizing easily obtainable, low price raw materials should result in economically cost-effective materials with extra environmental benefits.}, keywords = {Compressive Strength; thermal conductivity; sawdust; Alkali activation; Zeolite-poor rock; Glass-ceramic foams}, year = {2022}, eissn = {2352-7102}, orcid-numbers = {Kurovics, Emese/0000-0001-5669-3318} } @article{MTMT:33042722, title = {Preparation, characterization, and physicomechanical properties of glass-ceramic foams based on alkali-activation and sintering of zeolite-poor rock and eggshell. Zeolite-poor rock, Eggshell, Alkali activation, Compressive strength, Thermal conductivity}, url = {https://m2.mtmt.hu/api/publication/33042722}, author = {FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN and Gömze, Antal László and Koncz-Horváth, Dániel and Filep, Ádám and Kocserha, István}, doi = {10.1016/j.ceramint.2022.05.267}, journal-iso = {CERAM INT}, journal = {CERAMICS INTERNATIONAL}, volume = {48}, unique-id = {33042722}, issn = {0272-8842}, year = {2022}, eissn = {1873-3956}, pages = {25905-25917} }