TY - JOUR AU - Palásti, Dávid Jenő AU - Villy, Lajos Péter AU - Leits, B. AU - Kéri, Albert AU - Kohut, Attila AU - Bélteki, Ádám AU - Kajner, Gyula AU - Casian Plaza, Fernando Alexander AU - Kovács-Széles, Éva AU - Ajtai, Tibor AU - Veres, Miklós AU - Geretovszky, Zsolt AU - Galbács, Gábor TI - Detection and characterization of mono- and bimetallic nanoparticles produced by electrical discharge plasma generators using laser-induced breakdown spectroscopy JF - SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY J2 - SPECTROCHIM ACTA B VL - 209 PY - 2023 PG - 7 SN - 0584-8547 DO - 10.1016/j.sab.2023.106804 UR - https://m2.mtmt.hu/api/publication/34536295 ID - 34536295 LA - English DB - MTMT ER - TY - JOUR AU - Kajner, Gyula AU - Bélteki, Ádám AU - Cseh, Martin AU - Geretovszky, Zsolt AU - Ajtai, Tibor AU - Barna, Lilla AU - Deli, Mária Anna AU - Pap, Bernadett AU - Maróti, Gergely AU - Galbács, Gábor TI - Design, Optimization, and Application of a 3D-Printed Polymer Sample Introduction System for the ICP-MS Analysis of Nanoparticles and Cells JF - NANOMATERIALS J2 - NANOMATERIALS-BASEL VL - 13 PY - 2023 IS - 23 PG - 16 SN - 2079-4991 DO - 10.3390/nano13233018 UR - https://m2.mtmt.hu/api/publication/34401353 ID - 34401353 AB - Commonly used sample introduction systems for inductively coupled plasma mass spectrometry (ICP-MS) are generally not well-suited for single particle ICP-MS (spICP-MS) applications due to their high sample requirements and low efficiency. In this study, the first completely 3D-printed, polymer SIS was developed to facilitate spICP-MS analysis. The system is based on a microconcentric pneumatic nebulizer and a single-pass spray chamber with an additional sheath gas flow to further facilitate the transport of larger droplets or particles. The geometry of the system was optimized using numerical simulations. Its aerosol characteristics and operational conditions were studied via optical particle counting and a course of spICP-MS measurements, involving nanodispersions and cell suspensions. In a comparison of the performance of the new and the standard (quartz microconcentric nebulizer plus a double-pass spray chamber) systems, it was found that the new sample introduction system has four times higher particle detection efficiency, significantly better signal-to-noise ratio, provides ca. 20% lower size detection limit, and allows an extension of the upper limit of transportable particle diameters to about 25 µm. LA - English DB - MTMT ER - TY - JOUR AU - Kohut, Attila AU - Villy, Lajos Péter AU - Kohut, Gergely AU - Galbács, Gábor AU - Geretovszky, Zsolt TI - A Calibration-Free Optical Emission Spectroscopic Method to Determine the Composition of a Spark Discharge Plasma Used for AuAg Binary Nanoparticle Synthesis JF - APPLIED SPECTROSCOPY J2 - APPL SPECTROSC VL - 77 PY - 2023 IS - 12 SP - 1401 EP - 1410 PG - 10 SN - 0003-7028 DO - 10.1177/00037028231207358 UR - https://m2.mtmt.hu/api/publication/34393015 ID - 34393015 AB - Spark discharge generators (SDGs) employ controlled gaseous environments to induce spark ablation of non-insulating electrodes, resulting in the formation of various nanostructures in the gas phase. The method offers technological advantages such as continuous particle production, scalable yield, and minimal waste. Additionally, the versatility of the process enables the generation of alloy nanoparticles from various material combinations, including immiscible ones. In order to fully exploit its potential, understanding the atomic mixing process during electrode ablation, particularly in the case of dissimilar electrodes, is crucial. Temporally and spatially resolved optical emission spectroscopy (OES) has been previously demonstrated as an effective characterization tool for spark plasmas in SDGs. However, to gain a deeper insight into the vapor mixing process, it is essential to quantitatively determine the plasma composition in both space and time. This paper introduces a calibration-free OES-based method tailored for spark plasmas utilized in binary nanoparticle generation. The method introduces the so-called multi-element combinatory Boltzmann plots, which use intensity ratios of emission atomic lines from different materials, allowing for the direct estimation of total number concentration ratios. The approach is tested using synthetic spectra and validated with experimental spark spectra obtained near an alloyed gold–silver (AuAg) electrode with a known composition. The study demonstrates the capabilities and robustness of the proposed method, with a focus on the AuAg system due to its significance in plasmonic research and frequent synthesis using spark ablation. LA - English DB - MTMT ER - TY - BOOK AU - Kajner, Gyula AU - Bélteki, Ádám AU - Cseh, Martin AU - Vajda, Balázs AU - Geretovszky, Zsolt AU - Papp, Enikő AU - Braun, Mihály AU - Galbács, Gábor TI - Single particle ICP-MS analysis using 3D-printed nebulizers and spray chambers PY - 2023 UR - https://m2.mtmt.hu/api/publication/34292456 ID - 34292456 LA - English DB - MTMT ER - TY - JOUR AU - Horváth , Gábor AU - Körmöczi, Andor AU - Szörényi, Tamás AU - Geretovszky, Zsolt TI - Bead morphology of laser welded steel sheets and its correlation to the joint’s electrical and mechanical properties JF - JOURNAL OF LASER APPLICATIONS J2 - J LASER APPL VL - 35 PY - 2023 IS - 2 PG - 17 SN - 1042-346X DO - 10.2351/7.0000996 UR - https://m2.mtmt.hu/api/publication/33789432 ID - 33789432 AB - Nowadays, lasers are routine tools in the widest range of materials processing, including welding of battery packs. The properties of the laser generated weld bead are crucial in determining the electrical and mechanical behavior of the joint. Here, we report on the identification of five morphological bead types, namely, Rosenthal, single wave, elongated, pre-humping, and humping morphologies and their systematic appearance over the laser power versus scanning speed plane. We prove that each type exhibits characteristic electrical and mechanical behavior that differ not only in the magnitude of relevant materials’ properties, but also in their variability. We show for nickel-coated steel and uncoated DC01 cold rolled steel that the so-called single wave morphology is best suited for battery welding applications, since this morphology class concomitantly exhibits the lowest electrical resistance and the highest mechanical strength, both with a relatively small margin of error. The results suggest that the bead morphology could be exploited as a simple indicator of joint properties. LA - English DB - MTMT ER - TY - BOOK AU - Kajner, Gyula AU - Kéri, Albert AU - Bélteki, Ádám AU - Valkai, Sándor AU - Dér, András AU - Geretovszky, Zsolt AU - Galbács, Gábor TI - Single particle ICP-MS analysis using custom microfluidic chips and membrane separation PY - 2022 UR - https://m2.mtmt.hu/api/publication/34292368 ID - 34292368 LA - English DB - MTMT ER - TY - BOOK AU - Kajner, Gyula AU - Bélteki, Ádám AU - Cseh, Martin AU - Vajda, Balázs AU - Geretovszky, Zsolt AU - Galbács, Gábor TI - Design and optimization of an alternative high efficiency sample introduction system for single particle ICP-MS analysis PY - 2022 UR - https://m2.mtmt.hu/api/publication/34292001 ID - 34292001 LA - English DB - MTMT ER - TY - CHAP AU - Lovászi, Borbála AU - Szűcs, Diána AU - Guba, Melinda AU - Monostori, Tamás AU - Parvaneh, Shahram AU - Boldog, Katalin AU - Kemény, Lajos AU - Geretovszky, Zsolt AU - Veréb, Zoltán ED - Halász, Réka ED - Zimmermann, Ildikó TI - Creating artificial bone tissue using 3D tissue printing and mesenchymal stem cells T2 - Abstract Book of the 1st International Conference of Biomedical Engineering and Innovation PB - PTE CY - Pécs SN - 9789636260538 PY - 2022 SP - 44 EP - 44 PG - 1 UR - https://m2.mtmt.hu/api/publication/34064769 ID - 34064769 LA - English DB - MTMT ER - TY - JOUR AU - Villy, Lajos Péter AU - Kohut, Attila AU - Kéri, Albert AU - Bélteki, Ádám AU - Radnóczi, György AU - Fogarassy, Zsolt AU - Radnóczi, György Zoltán AU - Galbács, Gábor AU - Geretovszky, Zsolt TI - Continuous spark plasma synthesis of Au/Co binary nanoparticles with tunable properties JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 12 PY - 2022 IS - 1 PG - 9 SN - 2045-2322 DO - 10.1038/s41598-022-22928-0 UR - https://m2.mtmt.hu/api/publication/33208918 ID - 33208918 AB - We present here a scalable and environmentally friendly gas phase technique employing atmospheric pressure electrical spark discharge plasmas for the production of Au/Co binaries, an effective catalyst system for the decomposition of hydrogen-rich compounds, such as ammonium borane. We demonstrate that Au/Co alloy nanoparticles can be produced via the spark plasma-based technique. The possibility of varying the morphology and phase structure via real time heat treatment of the generated aerosol to form Au/Co/CoO particles with continuous control over a wide particle compositional range (from 24 to 64 at.% [Co]/([Co] + [Au]) content) is also demonstrated. Since our spark-based approach is proven to be capable of providing reasonable particle yields, these results may contribute to the transition of lab-scale, nanocatalyst-based hydrogen storage systems to real world applications. LA - English DB - MTMT ER - TY - JOUR AU - Kajner, Gyula AU - Kéri, Albert AU - Bélteki, Ádám AU - Valkai, Sándor AU - Dér, András AU - Geretovszky, Zsolt AU - Galbács, Gábor TI - Multifunctional microfluidic chips for the single particle inductively coupled plasma mass spectrometry analysis of inorganic nanoparticles JF - LAB ON A CHIP J2 - LAB CHIP VL - 22 PY - 2022 IS - 14 SP - 2766 EP - 2776 PG - 11 SN - 1473-0197 DO - 10.1039/D2LC00377E UR - https://m2.mtmt.hu/api/publication/32919211 ID - 32919211 AB - This study aimed at exploiting the so far unexploited potential of carrying out on-line sample pretreatment steps on microfluidic chips for single particle inductively coupled plasma mass spectrometry (spICP-MS) measurements, and demonstrating their ability to practically facilitate most of the simpler tasks involved in the spICP-MS analysis of nanoparticles. For this purpose, polydimethylsiloxane microfluidic chips, capable of high-range dilution and sample injection were made by casting, using high-precision, 3D-printed molds. Optimization of their geometry and functions was done by running several hydrodynamic simulations and by gravimetric, fluorescence enhanced microscope imaging and solution-based ICP-MS experiments. On the optimized microfluidic chips, several experiments were done, demonstrating the benefits of the approach and these devices, such as the determination of nanoparticle concentration using only a few tens of microliters of sample, elimination of solute interferences by dilution, solution-based size calibration and characterisation of binary nanoparticles. Due to the unique design of the chips, they can be linked together to extend the dilution range of the system by more than a magnitude per chip. This feature was also demonstrated in applications requiring multiple-magnitude dilution rates, when two chips were sequentially coupled LA - English DB - MTMT ER -