TY - JOUR AU - Gera, Tamás Bence AU - Kondász, Bence AU - Smausz Kolumbán, Tamás AU - Heszlerné Kopniczky, Judit AU - Hodovány, Szabolcs AU - Ajtai, Tibor AU - Szabó-Révész, Piroska AU - Ambrus, Rita AU - Csóka, Ildikó AU - Hopp, Béla TI - Pulsed laser ablation of polymer-based magnetic nanocomposites for oil spill remediation JF - CLEANER MATERIALS J2 - CLEANER MATERIALS VL - 11 PY - 2024 SN - 2772-3976 DO - 10.1016/j.clema.2024.100235 UR - https://m2.mtmt.hu/api/publication/34723729 ID - 34723729 LA - English DB - MTMT ER - TY - JOUR AU - Ajtai, Tibor AU - Utry, Noémi AU - Pintér, Máté AU - Abdul, Rahman AU - Kurilla, Boldizsár AU - Sárossy, Gábor AU - Deák, László AU - Baladincz, Jenő AU - Raffai, Péter AU - Szabó, Gábor AU - Bozóki, Zoltán TI - The investigation of diesel soot emission using instrument combination of multi-wavelength photoacoustic spectroscopy and scanning mobility particle sizer JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 14 PY - 2024 PG - 11 SN - 2045-2322 DO - 10.1038/s41598-024-52832-8 UR - https://m2.mtmt.hu/api/publication/34552784 ID - 34552784 N1 - Department of Optics and Quantum Electronics, University of Szeged, 9. Dóm Square, Szeged, 6720, Hungary HUN-REN-SZTE Research Group for Photoacoustic Monitoring of Environmental Processes, Dóm ter 9, Szeged, 6720, Hungary MOL Ltd. Duna Refinery, Százhalombatta, 2440, Hungary Export Date: 22 February 2024 Correspondence Address: Rahman, A.; Department of Optics and Quantum Electronics, 9. Dóm Square, Hungary; email: rahman.abdul@szte.hu Funding details: Hungarian Scientific Research Fund, OTKA, OTKANKFI-138176 Funding text 1: This work was supported by the TKP 2020 (Project NKFIH-1279-2/2020); the Hungarian Scientific Research Foundation (Project OTKANKFI-138176). AB - The parallel measurements of wavelength dependent optical absorption, particle number size distribution have made by a multi wavelength photoacoustic spectrometer (4λ-PAS) and scanning mobility particle sizer (SMPS) respectively at different modes of a diesel engine using two different types of fuel. The thermal evolution of the emission was also investigated using posterior temperature treatment of emission. The bimodal size distribution of emitted particles at a set reference temperature has been observed regardless of the applied fuel at idle. However, the emitted particulate assembly had lognormal size distribution falls into the accumulation mode at all other defined engine modes and both fuel types. The total number- and volume concentration (TNC and TVC) showed retrograde tendency with the increasing torque and rpm independently of the applied fuel types. The TNC values decreased up to 50% for both fuels with engine operation changes from idle engine mode(em#1) to low engine mode(em#2). With further increase in torque and rpm of engine, the change in TNC is negligible. On the other hand, the TVC remains more or less the same for idle to low engine mode transition and increased more than 60% for high mode (em#3) transition. The Optical Absorption Coefficient (OAC) values measured at the operational wavelengths of the 4λ-PAS instrument decreased at all wavelengths with increasing rpm and torque. The wavelength dependency quantified by Aerosol Ängström Exponent (AAE) was applied here for qualitative analysis of the carbonaceous emission and showed decreased values towards the higher engine speed and torque output of the engine. The proposed technique can be used as real-time, precise and accurate measurement of light absorption by DPM aerosols, which opens up novel possibilities for the volatility and thermal evolution investigation of diesel emissions. LA - English DB - MTMT ER - TY - JOUR AU - Végh, Panna AU - Gulyás, G. AU - Huszár, Helga AU - Ajtai, Tibor AU - Szabó, Gábor AU - Szabó, Anna AU - Bozóki, Zoltán TI - Compensation of composition variation-induced sensitivity changes in gas phase photoacoustics JF - INFRARED PHYSICS & TECHNOLOGY J2 - INFRARED PHYS TECHN VL - 137 PY - 2024 PG - 8 SN - 1350-4495 DO - 10.1016/j.infrared.2023.105116 UR - https://m2.mtmt.hu/api/publication/34506400 ID - 34506400 AB - Infrared photoacoustic (PA) spectroscopy is a widely used technique to monitor trace gas concentration changes during industrial processes where the bulk composition may vary considerably. However, the PA signal is prone to changes in bulk composition, leading to relative uncertainties in measurements of up to 10%, due to the complex dependence of the sensitivity of a PA system (S) on the thermal and acoustic properties of the gas sample. A novel calibration and concentration calculation method is proposed to keep the relative accuracy of the PA measurements in the few percentages range even in case of large-scale composition variations. The main novelty of the proposed method is that it tackles the complex dependence of the PA system's sensitivity in a way that while it varies the resonance frequency of the calibration gas, it keeps the heat capacity ratio of calibration gases at a constant value. We prove that it determines the analyte's concentration with relative accuracy of about 1 %, even when the composition of the gas varies drastically. It rigorously compensates for the frequency and heat capacity ratio dependence of S and for the dependence of the half-width of the resonance curve of the PA cell on the thermal and acoustic properties of the gas. Although the reported demonstration measurements are executed in a relatively simple gas mixture, the proposed method has widespread applicability in high-precision monitoring. © 2024 The Authors LA - English DB - MTMT ER - TY - GEN AU - Hodovány, Szabolcs AU - Ajtai, Tibor AU - Martin, Schnaiter AU - Szabó, Gábor AU - Bozóki, Zoltán TI - Soot selective size distribution measurement using PhotoAcoustic Spectroscopy (PAS). A demonstrative study PY - 2023 UR - https://m2.mtmt.hu/api/publication/34720564 ID - 34720564 N1 - Poszter LA - English DB - MTMT ER - 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 - Ajtai, Tibor AU - Hodovány, Szabolcs AU - Schnaiter, M. AU - Szabó, Gábor AU - Bozóki, Zoltán TI - Absorption based size characterisation of aerosol by using photoacoustic spectroscopy JF - ATMOSPHERIC ENVIRONMENT J2 - ATMOS ENVIRON VL - 304 PY - 2023 PG - 5 SN - 1352-2310 DO - 10.1016/j.atmosenv.2023.119772 UR - https://m2.mtmt.hu/api/publication/33804983 ID - 33804983 N1 - Department of Optics and Quantum Electronics, University of Szeged, Szeged, H-6720, Hungary ELKH-SZTE Research Group for Photoacoustic Monitoring of Environmental Processes, Dóm tér 9H-6720, Hungary Institut für Meteorologie und Klimaforschung, Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany Export Date: 9 May 2023 CODEN: AENVE Correspondence Address: Ajtai, T.; Department of Optics and Quantum Electronics, Hungary; email: ajtai@titan.physx.u-szeged.hu Funding details: NKFIH-1279-2/2020 Funding details: Hungarian Scientific Research Fund, OTKA, OTKA NKFI-138176 Funding details: Helmholtz Association Funding text 1: This work was supported by the TKP 2020 (project NKFIH-1279-2/2020 ); the Hungarian Scientific Research Foundation (project OTKA NKFI-138176 ); and within the Research Program “Changing Earth - Sustaining our Future” of the German Helmholtz Association. AB - The size of the atmospheric soot is a critical parameter in many perspectives starting from climate impact through health relevance ended with air quality regulations. In this study, we propose a novel methodology for soot selective size measurement of atmospheric aerosol. The proposed method is based on the synergy of selectivity of the aerosol photoacoustic (PA) spectroscopy for highly absorbing atmospheric components and size dependency of the measured phase of the PA signal. The proposed experimental set-up is based on the instrument combination of 4λ-PAS and scanning mobility particle sizer (SMPS) in a closed loop arrangement. We experimentally demonstrated here, first that the PA phase of the photoacoustic signal depends on the characteristic size of the soot aerosol. In order to better understand the effect of morphology, nigrosine particles with spherical shape are also studied. The comparison of the measured data and the theoretical calculation is also investigated. Comparison of the theoretical simulation and the measured data shows increasing differences towards the higher size of the measured aerosol in all samples. We also demonstrated that the inherent system phase is independent of the phase shift related to particles. © 2023 LA - English DB - MTMT ER - TY - GEN AU - Hodovány, Szabolcs AU - Ajtai, Tibor AU - Martin, Schnaiter AU - Szabó, Gábor AU - Bozóki, Zoltán TI - Soot selective size distribution measurement using PhotoAcoustic Spectroscopy (PAS). A demonstrative study. PY - 2022 UR - https://m2.mtmt.hu/api/publication/34162404 ID - 34162404 LA - English DB - MTMT ER - TY - CONF AU - Ajtai, Tibor AU - Bozóki, Zoltán TI - Gázfázisba diszpergált nanorészecskék vizsgálata. A Lézeres Aeroszol Kutatások Kutatócsoport (LAKK) legújabb eredményei T2 - A Magyar Tudományos Akadémia Analítikai és Környezetkémiai Bizottságának 10. Környezetkémiai Szimpóziuma PY - 2022 SP - 21 UR - https://m2.mtmt.hu/api/publication/33657128 ID - 33657128 LA - Hungarian DB - MTMT ER - TY - CONF AU - Hodovány, Szabolcs AU - Ajtai, Tibor AU - Kurilla, Boldizsár AU - Szabó, Gábor AU - Bozóki, Zoltán ED - Mladen, Franko TI - Soot selective size distribution measurement T2 - ICPPP21 Book of Abstracts PY - 2022 SP - 252 EP - 253 PG - 2 UR - https://m2.mtmt.hu/api/publication/33176893 ID - 33176893 LA - English DB - MTMT ER -