TY - JOUR AU - Al-Omari, Kassab AU - Roósz, András AU - Rónaföldi, Arnold AU - Kissné Svéda, Mária AU - Veres, Zsolt TI - Macrosegregation Evolution in Eutectic Al-Si Alloy under the Influence of a Rotational Magnetic Field JF - METALS J2 - METALS-BASEL VL - 12 PY - 2022 PG - 17 SN - 2075-4701 DO - 10.3390/met12111990 UR - https://m2.mtmt.hu/api/publication/33259042 ID - 33259042 LA - English DB - MTMT ER - TY - JOUR AU - Zhang, Haijie AU - Wu, Menghuai AU - Rodrigues, Christian M.G. AU - Ludwig, Andreas AU - Kharicha, Abdellah AU - Rónaföldi, Arnold AU - Roósz, András AU - Veres, Zsolt AU - Kissné Svéda, Mária TI - Dendrite fragmentation mechanism under forced convection condition by rotating magnetic field during unidirectional solidification of AlSi7 alloy JF - ACTA MATERIALIA J2 - ACTA MATER VL - 241 PY - 2022 PG - 14 SN - 1359-6454 DO - 10.1016/j.actamat.2022.118391 UR - https://m2.mtmt.hu/api/publication/33117826 ID - 33117826 AB - Forced convection and its effect on the microstructure evolution of an Al-7wt.%Si alloy during unidirectional solidification were studied experimentally. Under natural convection (gravity), columnar structures develop. However, under forced convection by activating a rotating magnetic field (RMF: 10 mT, 50 Hz), many equiaxed grains form in the half-radius region of the cylindrical sample, and a severe macrosegregation channel forms at the centre of the sample. Crystal fragmentation is regarded as the main source of equiaxed grains, but their formation mechanism and the fragment transport phenomenon are not fully understood. A mixed equiaxed-columnar solidification model with extension to consider two dendrite fragmentation mechanisms (capillary-driven and flow-driven), was used to reproduce the experiment with the objective to investigate the formation process of the microstructure and macrosegregation. Under the effect of the RMF-induced primary/secondary flow, the capillary-driven fragmentation mechanism, which is associated with dendrite coarsening, operates mainly in the peripheral region of the sample at a certain depth of the mushy zone. These fragments are difficult to be transported out of the (columnar dendritic) mushy zone. The flow-driven fragmentation mechanism associated with the interdendritic flow-induced re-melting of dendrites, operates mostly near the front of the mushy zone and/or around the central segregation channel. Some of these fragments can be transported out of the columnar tip region. In this case, a thin undercooled layer exists. Therefore, fragments can grow and become equiaxed grains. Some fragments are transported distally from the mushy zone into the bulk superheated region and are re-melted/destroyed there. The fragments, which continue to grow in the deep mushy zone or in the thin undercooled layer, are easily trapped by columnar dendrites, thereby competing with the growth of columnar dendrites to form a mixed columnar-equiaxed structure or even leading to a columnar-to-equiaxed transition. LA - English DB - MTMT ER - TY - JOUR AU - Shehab, Mohammed AU - Sharma, Nikita AU - Karacs, Gábor AU - Nánai, Lilla AU - Kocserha, István AU - Hernádi, Klára AU - Németh, Zoltán TI - Development and Investigation of Photoactive WO3 Nanowire-Based Hybrid Membranes JF - CATALYSTS J2 - CATALYSTS VL - 12 PY - 2022 IS - 9 PG - 13 SN - 2073-4344 DO - 10.3390/catal12091029 UR - https://m2.mtmt.hu/api/publication/33090772 ID - 33090772 AB - Novel hybrid structures have attracted attention in several instances of scientific research and different technological applications in this decade due to their novel characteristics and wide range of applicability. Hybrid membranes with multiple components (three or more) are also increasingly used in water purification applications, and their ease of handling and reusability make them a promising candidate for the degradation of organic pollutants by photocatalysis. In this study, the preparation and characterization of tungsten trioxide nanowire (WO3 NW)-based hybrid membrane structures are reported. Furthermore, the adsorption properties and photocatalytic efficiency of the as-prepared membranes against methylene blue (MB) organic dye under UV irradiation is also presented. Characterization techniques, such as scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray powder diffraction (XRD) are performed to study the morphology and surface of the as-prepared hybrid membranes. The removal efficiency of the hybrid membranes against MB is 77% in a 120 min decomposition reaction. The enhanced value can be attributed to the hybrid structure of the membrane that enhances not only the adsorption capability, but also the photocatalytic performance. Based on the results obtained, it is hoped that hybrid membrane technology could be a promising candidate for future photocatalysis-based water treatment applications. LA - English DB - MTMT ER - TY - JOUR AU - Roósz, András AU - Rónaföldi, Arnold AU - Yuze, Li AU - Nathalie, Mangelinck-Noel AU - Gerhard, Zimmermann Henri Nguyen-Thi AU - Kissné Svéda, Mária AU - Veres, Zsolt TI - Microstructure Analysis of Al-7 wt% Si Alloy Solidified on Earth Compared to Similar Experiments in Microgravity JF - CRYSTALS J2 - CRYSTALS VL - 12 PY - 2022 IS - 9 PG - 29 SN - 2073-4352 DO - 10.3390/cryst12091226 UR - https://m2.mtmt.hu/api/publication/33074217 ID - 33074217 LA - English DB - MTMT ER - TY - JOUR AU - Khine, Ei Ei AU - Koncz-Horváth, Dániel AU - Kristály, Ferenc AU - Ferenczi, Tibor AU - Karacs, Gábor AU - Baumli, Péter AU - Kaptay, György TI - Synthesis and characterization of calcium oxide nanoparticles for CO2 capture JF - JOURNAL OF NANOPARTICLE RESEARCH J2 - J NANOPART RES VL - 24 PY - 2022 IS - 7 PG - 11 SN - 1388-0764 DO - 10.1007/s11051-022-05518-z UR - https://m2.mtmt.hu/api/publication/33026695 ID - 33026695 LA - English DB - MTMT ER - TY - JOUR AU - Al-Omari, Kassab AU - Roósz, András AU - Rónaföldi, Arnold AU - Veres, Zsolt TI - Effect of Forced Melt Flow on Al–Si Eutectic-Alloy Microstructures JF - CRYSTALS J2 - CRYSTALS VL - 12 PY - 2022 IS - 5 PG - 14 SN - 2073-4352 DO - 10.3390/cryst12050731 UR - https://m2.mtmt.hu/api/publication/32857514 ID - 32857514 LA - English DB - MTMT ER - TY - JOUR AU - Végh, Ádám AU - Korózs, József AU - Kaptay, György TI - Extension of the Gibbs–Duhem Equation to the Partial Molar Surface Thermodynamic Properties of Solutions JF - LANGMUIR J2 - LANGMUIR VL - 38 PY - 2022 IS - 16 SP - 4906 EP - 4912 PG - 7 SN - 0743-7463 DO - 10.1021/acs.langmuir.2c00229 UR - https://m2.mtmt.hu/api/publication/32842254 ID - 32842254 LA - English DB - MTMT ER - TY - JOUR AU - Shehab, Mohammed AU - Sharma, Nikita AU - Valsesia, Andrea AU - Karacs, Gábor AU - Kristály, Ferenc AU - Koós, Tamás AU - Leskó, Anett Katalin AU - Nánai, Lilla AU - Hernádi, Klára AU - Németh, Zoltán TI - Preparation and Photocatalytic Performance of TiO2 Nanowire-Based Self-Supported Hybrid Membranes JF - MOLECULES J2 - MOLECULES VL - 27 PY - 2022 IS - 9 PG - 13 SN - 1420-3049 DO - 10.3390/molecules27092951 UR - https://m2.mtmt.hu/api/publication/32808257 ID - 32808257 LA - English DB - MTMT ER - TY - JOUR AU - Zhang, Haijie AU - Wu, Menghuai AU - Zhang, Zhao AU - Ludwig, Andreas AU - Kharicha, Abdellah AU - Rónaföldi, Arnold AU - Roósz, András AU - Veres, Zsolt AU - Kissné Svéda, Mária TI - Experimental Evaluation of MHD Modeling of EMS During Continuous Casting JF - METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE J2 - METALL MATER TRANS B VL - 53 PY - 2022 IS - 4 SP - 2166 EP - 2181 PG - 16 SN - 1073-5615 DO - 10.1007/s11663-022-02516-3 UR - https://m2.mtmt.hu/api/publication/32793546 ID - 32793546 AB - Electromagnetic stirring (EMS) has been recognized as a mature technique in steel industry to control the as-cast structure of steel continuous casting (CC), and computational magnetohydrodynamic (MHD) methods have been applied to study the EMS efficiency. Most MHD methods de-coupled the calculations of electromagnetic and flow fields or simplifications were made for the flow–electromagnetic interactions. However, the experimental validations of the MHD modeling have been rarely reported or very limited. In this study, we present a benchmark, i.e., a series of laboratory experiments, to evaluate the MHD methods, which have been typically applied for steel CC process. Specifically, a rotating magnetic field (RMF) with variable intensity and frequency is considered. First experiment is performed to measure the distribution of magnetic field without any loaded sample (casting); the second experiment is conducted to measure the RMF-induced torque on a cylindrical sample (different metals/alloys in solid state); the third experiment is (based on a special device) to measure the RMF-induced rotational velocity of the liquid metal (Ga75In25), which is enclosed in a cylindrical crucible. The MHD calculation is performed by coupling ANSYS Maxwell and ANSYS Fluent. The Lorentz force, as calculated by analytical equations, ANSYS Fluent addon MHD module, and external electromagnetic solver, is added as the source term in Navier–Stokes equation. By comparing the simulation results with the benchmark experiments, the calculation accuracy with different coupling methods and modification strategies is evaluated. Based on this, a necessary simplification strategy of the MHD method for CC is established, and application of the simplified MHD method to a CC process is demonstrated. LA - English DB - MTMT ER - TY - JOUR AU - Rónaföldi, Arnold AU - Veres, Zsolt AU - Kissné Svéda, Mária AU - Roósz, András TI - New Equipment and Method for Refining the Solidified Grain Structure JF - METALS J2 - METALS-BASEL VL - 12 PY - 2022 IS - 4 PG - 18 SN - 2075-4701 DO - 10.3390/met12040658 UR - https://m2.mtmt.hu/api/publication/32781495 ID - 32781495 LA - English DB - MTMT ER -