TY - JOUR AU - Gál, Márton AU - Samaniego Andrade, Samantha Kathiuska AU - Fehér, Anna Éva AU - Farkas, Attila AU - Madarász, János AU - Horváth, Lili AU - Gordon, Péter AU - Kovács, Róbert Sándor AU - Nagyné László, Krisztina TI - Thermal diffusity in copper benzene-1,3,5-tricarboxylate–reduced graphite oxide mechanical composites JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM PY - 2024 PG - 13 SN - 1388-6150 DO - 10.1007/s10973-024-13021-x UR - https://m2.mtmt.hu/api/publication/34772009 ID - 34772009 N1 - Funding Agency and Grant Number: Nemzeti Kutatsi Fejlesztsi s Innovcis Hivatal [2020-3.1.1-ZFR-KVG-2020-00006]; National Research, Development and Innovation Fund of Hungary [2020-3.1.2-ZFR-KVG]; Hungarian grants [OTKA K143571, FK134277, TKP-6-6/PALY-2021]; Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund [TKP2021-NVA]; Sustainable Development and Technologies National Programme of the Hungarian Academy of Sciences (FFT NP FTA); Stipendium Hungaricum scholarship program of the Hungarian Government Funding text: We extend our warm thanks to G. Bosznai (BME) for the invaluable technical assistance. This work was performed in the frame of the 2020-3.1.1-ZFR-KVG-2020-00006 project, implemented with the support provided from the National Research, Development and Innovation Fund of Hungary, financed under the 2020-3.1.2-ZFR-KVG funding scheme. This research was also funded by the Hungarian grants OTKA K143571 and FK134277. The research is part of project no Project no. TKP-6-6/PALY-2021 has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-NVA funding scheme. The research was also funded by the Sustainable Development and Technologies National Programme of the Hungarian Academy of Sciences (FFT NP FTA). SKSA is grateful to the Stipendium Hungaricum scholarship program of the Hungarian Government. AB - Metal organic frameworks (MOFs) and particularly copper benzene-1,3,5-tricarboxylate (HKUST-1) are excellent materials for gas storage (e.g., CH 4 , N 2 , H 2 adsorption) and gas separation. In this work, reduced graphene oxide (RGO)–HKUST-1 mechanical mixtures were studied in order to reveal the effect of RGO content on the pressure tolerance of the texture and heat conductivity. HKUST-1 was obtained by two different synthesis routes. Air-dried MOF and RGO were thoroughly mixed prior to the compression. Powder XRD and Raman spectroscopy were used to characterize the response of the crystal structure, while low-temperature nitrogen adsorption was used the follow the adsorption properties of the pellets. Finally, the "flash" heat pulse method was used to assess the thermal properties. The gas adsorption isotherms revealed that the adsorption capacity decreases when RGO is added. Based on Raman and XRD results, we found that the synthesis route has an effect on multiple scales. We experimentally confirmed that evaluation of the thermal diffusivity requires a model more complex than the simple Fourier equation, due to the inherent heterogeneous structure of the material. A good approximation of the Fourier coefficient of thermal diffusivity was obtained using the parameters of the Guyer–Krumhansl equation. The heat pulse experiments also revealed possible size-dependent behavior. LA - English DB - MTMT ER - TY - CONF AU - Csorba, Benjámin AU - Madarász, János AU - Farkas, László AU - Boros, Renáta Zsanett AU - Mihalkó, Andrea AU - Csécsi, Marcell Dániel AU - Gresits, Iván TI - Removal of Trace Amounts of Polluting Metals from Concentrated Electrolytic Rock Salt Solutions By Coagulation, Sedimentation and Ion Exchange T2 - Proceedings of 2023 AIChE Annual Meeting PY - 2023 SP - 1 UR - https://m2.mtmt.hu/api/publication/34571689 ID - 34571689 LA - English DB - MTMT ER - TY - CONF AU - Csorba, Benjámin AU - Madarász, János AU - Mihalkó, Andrea AU - Farkas, László AU - Boros, Renáta Zsanett AU - Csécsi, Marcell Dániel AU - Bazsányi, Péter AU - Gresits, Iván ED - Majdik, Cornelia TI - A klór-alkáli iparban használt tömény kősóoldatok flokkulá-cióval, szedimentációval és ioncseréléssel történő tisztítási lehetőségeinek feltérképezése T2 - XXIX. Nemzetközi Vegyészkonferencia / 29th International Conference on Chemistry PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár T3 - Nemzetközi Vegyészkonferencia, ISSN 1843-6293 PY - 2023 SP - 1 UR - https://m2.mtmt.hu/api/publication/34571682 ID - 34571682 LA - English DB - MTMT ER - TY - JOUR AU - Bánhegyi, Dorottya Fruzsina AU - Madarász, János AU - Fogassy, Elemér AU - Pálovics, Emese Csilla AU - Pokol, György TI - Crystalline Forms of 4,4'-Methylenediantipyrine: Crystallographic Unit Cell for the Anhydrous Form, from Laboratory Powder XRD Pattern by DASH Program Package JF - PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING J2 - PERIOD POLYTECH CHEM ENG VL - 67 PY - 2023 IS - 4 SP - 557 EP - 564 PG - 8 SN - 0324-5853 DO - 10.3311/PPch.22950 UR - https://m2.mtmt.hu/api/publication/34204776 ID - 34204776 N1 - Funding Agency and Grant Number: National Research, Development and Innovation Office-NKFIH through OTKA [124180, FK138475, 146218] Funding text: E.F. and E.P. are grateful for the past and future support of the National Research, Development and Innovation Office-NKFIH through OTKA grant Nos. 124180 and FK138475 and 146218, respectively. The authors are also grateful to Mr. David Susko for his substantial help in the preparative work. AB - Crystalline unit cell structure of anhydrous title compound, diantipyrinylmethane (CAS Registry No. 1251-85-0), a substance usually obtained as a by-product in Mannich type reactions of antipyrine, has been modelled by the help of powder X-ray diffraction, applying the DASH software package and crystal coordinates coming from former single crystal X-ray structure determinations (CSD codes FADDIY and FADDIY01) of its monohydrate. The unit cell of the anhydrate compound belongs to the monoclinic space group P21/a, with unit cell parameters of a = 14.604, b = 9.858, c = 14.509 Å, β = 95.56 °, V = 2078.9 Å3, Z = 4, Z ' = 1. Comparisons of FT-IR spectrum and thermal behavior of the anhydrous and monohydrated forms confirm differences in degree of hydration and solid state structure, while those of 1H- and 13C NMR-spectra show their molecular identity. LA - English DB - MTMT ER - TY - CHAP AU - Csorba, Benjámin AU - Madarász, János AU - Farkas, László AU - Boros, Renáta Zsanett AU - Mihalkó, Andrea AU - Csécsi, Marcell Dániel AU - Gresits, Iván TI - Elektrolízisipari tömény kősóoldatok nyomnyi szennyező fémtartalmának eltávolítása koaguláció, szedimentáció útján T2 - Műszaki Kémiai Napok 2023 Konferencia PB - Pannon Egyetem CY - Veszprém SN - 9789633962565 PY - 2023 SP - 19 UR - https://m2.mtmt.hu/api/publication/34139171 ID - 34139171 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Tegze, Borbála Ágnes AU - Tolnai, G. AU - Hessz, Dóra AU - Kubinyi, Miklós AU - Madarász, János AU - Sáfrán, György AU - Hórvölgyi, Zoltán TI - Effect of heat treatment temperature on the morphology and upconversion properties of LaF3:Yb,Er nanoparticles JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM VL - 148 PY - 2023 IS - 20 SP - 10795 EP - 10802 PG - 8 SN - 1388-6150 DO - 10.1007/s10973-023-12417-5 UR - https://m2.mtmt.hu/api/publication/34094273 ID - 34094273 AB - LaF 3 :5%Yb 3+ ,0.5%Er 3+ upconverting nanoparticles were synthesized with co-precipitation method and heat treated at temperatures 300–600 °C. The morphology of the particles was characterized by high-resolution transmission electron microscopy coupled with energy-dispersive spectrometry and dynamic light scattering. Crystal structure was studied by X-ray diffraction (XRD), and thermal behaviour was investigated by simultaneous thermogravimetry and differential thermal analysis (TG/DTA). Upconversion behaviour was studied in detail by fluorescence spectroscopy, with 980 nm excitation. Particle sizes increased with increasing heat treatment temperature, and samples showed significant aggregation above 500 °C. Hexagonal LaF 3 crystal structure was identified for all samples, with increased crystallinity after heat treatment at 400 °C, which was corroborated with TG/DTA results. XRD and energy-dispersive spectrometry results revealed that at higher temperatures new crystal phases formed, as some Yb 3+ and Er 3+ dopant ions segregated into new nanocrystals, made of, for example, YbOF and YbOOH, which caused a significant decrease in the upconversion emission of the samples. The highest upconversion emission was achieved after heat treatment at 400 °C. LA - English DB - MTMT ER - TY - JOUR AU - Farah, Shereen Farah Ahmed AU - Gyarmati, Benjámin Sándor AU - Madarász, János AU - Villar-Rodil, S. AU - Tascón, J.M.D. AU - Nagyné László, Krisztina TI - Heterogenity of graphite oxide particles obtained with wet oxidative exfoliation JF - JOURNAL OF MOLECULAR LIQUIDS J2 - J MOL LIQ VL - 386 PY - 2023 SN - 0167-7322 DO - 10.1016/j.molliq.2023.122451 UR - https://m2.mtmt.hu/api/publication/34094261 ID - 34094261 N1 - Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem Rkp. 3, Budapest, H-1111, Hungary Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem Rkp. 3, Budapest, H-1111, Hungary Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Francisco. Pintado Fe 26, Oviedo, 33011, Spain Export Date: 14 August 2023 CODEN: JMLID Correspondence Address: László, K.; Department of Physical Chemistry and Materials Science, Műegyetem Rkp. 3, Hungary LA - English DB - MTMT ER - TY - JOUR AU - Márton, Péter AU - Nagy, Örs Tamás AU - Kovács, Dorina AU - Szolnoki, Beáta AU - Madarász, János AU - Nagy, Norbert AU - Szabó, Gabriella Stefánia AU - Hórvölgyi, Zoltán TI - Barrier behaviour of partially N-acetylated chitosan layers in aqueous media JF - INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES J2 - INT J BIOL MACROMOL VL - 232 PY - 2023 PG - 8 SN - 0141-8130 DO - 10.1016/j.ijbiomac.2023.123336 UR - https://m2.mtmt.hu/api/publication/33630312 ID - 33630312 LA - English DB - MTMT ER - TY - JOUR AU - Pálovics, Emese Csilla AU - Madarász, János AU - Pokol, György AU - Fogassy, Elemér AU - Bánhegyi, Dorottya Fruzsina TI - Economic Separations of Organic Acidic or Basic Enantiomeric Mixtures—A Protocol Suggestion JF - INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES J2 - INT J MOL SCI VL - 24 PY - 2023 IS - 1 PG - 23 SN - 1661-6596 DO - 10.3390/ijms24010846 UR - https://m2.mtmt.hu/api/publication/33543852 ID - 33543852 N1 - Funding Agency and Grant Number: National Research, Development and Innovation Office-NKFIH [FK138475] Funding text: This research was funded by the National Research, Development and Innovation Office-NKFIH, Grant/Award Number: FK138475. AB - In this review, we aim to present new concepts for the revisited separation of enantiomers from racemic compounds and a protocol worth to be followed in designing the preparation of pure enantiomers. We have taken into account not only the influence of the properties (eutectic composition) and characteristics of the reactants (racemic compound, resolving agent), but also the behavior of the resulting diastereomers and the different conditions (e.g., crystallization time, solvents used, solvate-forming compounds, achiral additives, etc.). The examples discussed are resolutions developed by our research team, through which we will try to illustrate the impact of all these considerations, presenting the methodological investigations interpreting recent discoveries and observations. Some special solid-state analytical and structural investigations assisting us in the elucidation and invention design of the resolution processes of some active pharmaceutical ingredients, such as Tetramisole, tofisopam, and Amlodipine, are also shown. LA - English DB - MTMT ER - TY - CONF AU - Várhelyi, Csaba, ifj. AU - Pokol, György AU - Szalay, Roland AU - MEREU, RALUCA-ANCA AU - Simon-Várhelyi, Melinda AU - Tötös, Róbert AU - Madarász, János AU - PAPP, JUDIT AU - Mihály, Judith TI - Szemi- és tioszemikarbazonokkal képzett platina- és nikkel-komplexek előállítása, valamint fizikai-kémiai és biológiai vizsgálatuk (Pt- and Ni-complexes Syntheses with Semi- and Thiosemicarbazones, and their Physical-Chemical and Biological Study) T2 - A Magyar Tudomány Napja Erdélyben 2022: Tudomány: út a világ megismeréséhez PY - 2022 SP - 28 EP - 30 PG - 3 UR - https://m2.mtmt.hu/api/publication/33646163 ID - 33646163 N1 - EME – Természettudományi szakosztály LA - Hungarian DB - MTMT ER -