TY - JOUR AU - Chodkowski, Michał AU - Terpiłowski, Konrad AU - Románszki, Loránd AU - Klébert, Szilvia AU - Mohai, Miklós AU - Károly, Zoltán TI - Effect of Non‐Thermal Sulfur Hexafluoride Cold Plasma Modification on Surface Properties of Polyoxymethylene JF - CHEMPHYSCHEM: A EUROPEAN JOURNAL OF CHEMICAL PHYSICS AND PHYSICAL CHEMISTRY J2 - CHEMPHYSCHEM PY - 2024 PG - 14 SN - 1439-4235 DO - 10.1002/cphc.202300709 UR - https://m2.mtmt.hu/api/publication/34762097 ID - 34762097 AB - X‐ray photoelectron spectroscopy was employed to reveal the differences in the chemical structure of the topmost layer after plasma modification. It was found out that changes in the surface properties of the polymer could be observed even after 20 seconds of treatment. The surface becomes hydrophobic or superhydrophobic, with the water contact angles up to 160 degrees. Morphological changes and increased roughness can be observed only in the nanoscale, whereas the structure seems to be unaffected in the microscale. As a result of plasma modification a permanent hydrophobic effect was obtained on the polyoxymethylene surface. LA - English DB - MTMT ER - TY - CHAP AU - Shaban, Abdul AU - Tala, Abouhalkuma AU - Vastag, Gyöngyi AU - Telegdi, Lászlóné ED - Nirav, J. Joshi ED - Sachin, Naval TI - Chapter 5. Nanostructured Materials and Electronic Nose Devices: Introduction T2 - Nanostructured Materials for Electronic Nose PB - Springer Nature Singapore CY - Singapore SN - 9789819713905 T3 - Advanced Structured Materials, ISSN 1869-8433 ; 213. PY - 2024 SN - 9789819713905 UR - https://m2.mtmt.hu/api/publication/34756886 ID - 34756886 LA - English DB - MTMT ER - TY - JOUR AU - Béres, Kende Attila AU - Dürvanger, Zsolt AU - Homonnay, Zoltán AU - Nagyné Bereczki, Laura AU - Barta Holló, Berta AU - Farkas, Attila AU - Petruševski, Vladimir M. AU - Kótai, László TI - Insight into the Structure and Redox Chemistry of [Carbonatotetraamminecobalt(III)] Permanganate and Its Monohydrate as Co-Mn-Oxide Catalyst Precursors of the Fischer-Tropsch Synthesis JF - INORGANICS J2 - INORGANICS VL - 12 PY - 2024 IS - 4 PG - 28 SN - 2304-6740 DO - 10.3390/inorganics12040094 UR - https://m2.mtmt.hu/api/publication/34753165 ID - 34753165 N1 - Institute of Materials and Environmental Chemistry, HUN-REN Research Centre for Natural Sciences, Budapest, H-1117, Hungary György Hevesy PhD School of Chemistry, ELTE Eötvös Loránd University, Budapest, H-1053, Hungary Structural Chemistry and Biology Laboratory, Institute of Chemistry, ELTE Eötvös Loránd University, Budapest, H-1117, Hungary ELKH-ELTE Protein Modelling Research Group, Budapest, H-1117, Hungary Institute of Chemistry, ELTE Eötvös Loránd University, Budapest, H-1053, Hungary Centre for Structural Science, HUN-REN Research Centre for Natural Sciences, Budapest, H-1117, Hungary Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Novi Sad, SRB-21000, Serbia Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budapest, H-1117, Hungary Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje, MK-1000, North Macedonia Deuton-X Ltd., Érd, H-2030, Hungary Export Date: 3 May 2024 Correspondence Address: Kótai, L.; Institute of Materials and Environmental Chemistry, Hungary; email: kotai.laszlo@ttk.hu AB - [Carbonatotetraamminecobalt(III)] permanganate monohydrate was synthesized first in the metathesis reaction of [Co(NH3)4CO3]NO3 and NaMnO4 in aqueous solution. Its thermal dehydration at 100 °C resulted in phase-pure [Co(NH3)4CO3]MnO4 (compound 1). Compounds 1 and 2 (i.e., the hydrated form) were studied with IR, far-IR, and low-temperature Raman spectroscopies, and their vibrational modes were assigned. The lattice parameters were determined by powder X-ray diffraction (PXRD) and single crystal X-ray diffraction (SXRD) methods for the triclinic and orthorhombic compounds 1 and 2, respectively. The detailed structure of compound 2 was determined, and the role of hydrogen bonds in the structural motifs was clarified. UV studies on compounds 1 and 2 showed the distortion of the octahedral geometry of the complex cation during dehydration because of the partial loss of the hydrogen bonds between the crystal water and the ligands of the complex cation. The thermal decomposition consists of a solid phase quasi-intramolecular redox reaction between the ammonia ligands and permanganate anions with the formation of ammonia oxidation products (H2O, NO, N2O, and CO2). The solid phase reaction product is amorphous cobalt manganese oxide containing ammonium, carbonate (and nitrate) anions. The temperature-controlled thermal decomposition of compound 2 in toluene at 110 °C showed that one of the decomposition intermediates is ammonium nitrate. The decomposition intermediates are transformed into Co1.5Mn1.5O4 spinel with MnCo2O4 structure upon further heating. Solid compound 2 gave the spinel at 500 °C both in an inert and air atmosphere, whereas the sample pre-treated in toluene at 110 °C without and with the removal of ammonium nitrate by aqueous washing, gave the spinel already at 300 and 400 °C, respectively. The molten NH4NO3 is a medium to start spinel crystallization, but its decomposition stops further crystal growth of the spinel phase. By this procedure, the particle size of the spinel product as low as ~4.0 nm could be achieved for the treatments at 300 and 400 °C, and it increased only to 5.7 nm at 500 °C. The nano-sized mixed cobalt manganese oxides are potential candidates as Fischer-Tropsch catalysts. LA - English DB - MTMT ER - TY - JOUR AU - Kouznetsova, T. AU - Ivanets, A. AU - Prozorovich, V. AU - Shornikova, P. AU - Kapysh, L. AU - Tian, Q. AU - Péter, László AU - Trif, László AU - Almásy, László TI - Design of Nickel-Containing Nanocomposites Based on Ordered Mesoporous Silica: Synthesis, Structure, and Methylene Blue Adsorption JF - GELS (BASEL) J2 - GELS-BASEL VL - 10 PY - 2024 IS - 2 PG - 15 SN - 2310-2861 DO - 10.3390/gels10020133 UR - https://m2.mtmt.hu/api/publication/34751383 ID - 34751383 N1 - Export Date: 29 April 2024 LA - English DB - MTMT ER - TY - JOUR AU - Béres, Kende Attila AU - Homonnay, Zoltán AU - Kótai, László TI - Hexakis(urea-O)iron Complex Salts as a Versatile Material Family: Overview of Their Properties and Applications JF - ACS OMEGA J2 - ACS OMEGA VL - 9 PY - 2024 IS - 10 SP - 11148 EP - 11167 PG - 20 SN - 2470-1343 DO - 10.1021/acsomega.3c09635 UR - https://m2.mtmt.hu/api/publication/34718662 ID - 34718662 N1 - Institute of Materials and Environmental Chemistry, HUN-REN Research Centre for Natural Sciences, Magyar Tudósok krt. 2., Budapest, H-1117, Hungary Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter s. 1/A, Budapest, H-1117, Hungary Export Date: 19 March 2024 Correspondence Address: Béres, K.A.; Institute of Materials and Environmental Chemistry, Magyar Tudósok krt. 2., Hungary; email: beres.kende.attila@ttk.hu Correspondence Address: Kótai, L.; Institute of Materials and Environmental Chemistry, Magyar Tudósok krt. 2., Hungary; email: kotai.laszlo@ttk.hu LA - English DB - MTMT ER - TY - JOUR AU - Ipkovich, Ádám AU - Héberger, Károly AU - Sebestyén, Viktor AU - Abonyi, János TI - Utility function-based generalization of sum of ranking differences–country-wise analysis of greenhouse gas emissions JF - ECOLOGICAL INDICATORS J2 - ECOL INDIC VL - 160 PY - 2024 PG - 18 SN - 1470-160X DO - 10.1016/j.ecolind.2024.111734 UR - https://m2.mtmt.hu/api/publication/34679063 ID - 34679063 LA - English DB - MTMT ER - TY - JOUR AU - Fehér, Zsuzsanna AU - Németh, Réka AU - Kiss, Johanna AU - Balterer, Bence AU - Verebélyi, Klára AU - Iván, Béla AU - Kupai, József TI - A silica-supported organocatalyst for polycarbonate methanolysis under mild and economic conditions JF - CHEMICAL ENGINEERING JOURNAL J2 - CHEM ENG J VL - 485 PY - 2024 PG - 12 SN - 1385-8947 DO - 10.1016/j.cej.2024.149832 UR - https://m2.mtmt.hu/api/publication/34679053 ID - 34679053 N1 - Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., Budapest, H-1111, Hungary NMR Research Laboratory, Centre for Structural Science, HUN-REN Research Centre for Natural Sciences, Magyar Tudósok krt. 2., Budapest, H-1117, Hungary Polymer Chemistry and Physics Research Group, Institute of Materials and Environmental Chemistry, HUN-REN Research Centre for Natural Sciences, Magyar Tudósok krt. 2., Budapest, H-1117, Hungary Export Date: 18 March 2024 CODEN: CMEJA Correspondence Address: Kupai, J.; Department of Organic Chemistry and Technology, Műegyetem rkp. 3., Hungary; email: kupai.jozsef@vbk.bme.hu Funding details: ÚNKP-22-2-II-BME-161 Funding details: European Commission, EC Funding details: Richter Gedeon Talentum Alapítvány Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA, 1-21-2022-00015, RRF-2.3 Funding details: National Research, Development and Innovation Office, FK138037 Funding text 1: The authors are grateful to Balázs Orbán for recording the SEM images of the modified silica gels. This research was funded by the National Research, Development, and Innovation Office (grant number FK138037) and the Richter Gedeon Excellence PhD Scholarship of the Richter Gedeon Talentum Foundation, Gedeon Richter Plc. (Z.F.). Further support was provided by the ÚNKP-22-2-II-BME-161 New National Excellence Program of the Ministry for Culture and Innovation sourced from the National Research, Development and Innovation Fund . Project no. RRF-2.3. 1-21-2022-00015 has been implemented with the support provided by the European Union . LA - English DB - MTMT ER - TY - JOUR AU - Kótai, László AU - Lázár, Károly AU - Kiss, László Ferenc AU - Szentmihályi, Klára TI - Reaction of Partially Methylated Polygalacturonic Acid with Iron(III) Chloride and Characterization of a New Mixed Chloride–Polygalacturonate Complex JF - MOLECULES J2 - MOLECULES VL - 29 PY - 2024 IS - 4 PG - 16 SN - 1420-3049 DO - 10.3390/molecules29040890 UR - https://m2.mtmt.hu/api/publication/34643365 ID - 34643365 LA - English DB - MTMT ER - TY - JOUR AU - Takács, Kata AU - Slezák, Emese AU - Pregi, Emese AU - Plachi, D. AU - Vági, Erika AU - Renkeczné Tátraaljai, Dóra AU - Pukánszky, Béla TI - Stabilization of polyethylene with grape pomace extract: Effect of natural oil content JF - POLYMER DEGRADATION AND STABILITY J2 - POLYM DEGRAD STABIL VL - 221 PY - 2024 PG - 8 SN - 0141-3910 DO - 10.1016/j.polymdegradstab.2024.110678 UR - https://m2.mtmt.hu/api/publication/34628200 ID - 34628200 N1 - Laboratory of Plastics and Rubber Technology, 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 Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2., Budapest, H-1117, Hungary Department of Chemical and Environmental Process Engineering, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, Budapest, H-1111, Hungary Export Date: 19 February 2024 CODEN: PDSTD Correspondence Address: Tátraaljai, D.; Laboratory of Plastics and Rubber Technology, Műegyetem rkp. 3, Hungary; email: tatraaljai.dora@ttk.hu Funding details: Budapesti Műszaki és Gazdaságtudományi Egyetem, BME Funding details: Hungarian Scientific Research Fund, OTKA, PD 138507 Funding details: Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFI Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA Funding text 1: The authors are grateful for Bálint Imre for the FTIR measurements. The National Research, Development and Innovation Fund of Hungary ( OTKA PD 138507 ) is greatly acknowledged for the financial support of the research. The project supported by the Doctoral Excellence Fellowship Programme (DCEP) is funded by the National Research Development and Innovation Fund of the Ministry of Culture and Innovation and the Budapest University of Technology and Economics, under a grant agreement with the National Research, Development and Innovation Office. AB - The winery waste of a white grape was extracted in two different ways to produce extracts, one containing the natural oil of the waste and one without it; the goal of the work was to determine the positive or negative influence of the natural oil content of the extract on its stabilization effect and efficiency. The polyphenol content of the extracts was moderate, but their DPPH assay proved their antioxidant effect. The two extracts were added to polyethylene in concentrations between 0 and 2000 ppm, and their stabilizing efficiency was determined in multiple extrusion experiments. The extracts stabilized polyethylene adequately; their efficiency was only slightly smaller than that of the commercial hindered phenolic antioxidant, Irganox 1010. The solubility of the extracts in PE is much larger, 280 ppm, than that of a flavonoid-type natural antioxidant, quercetin (15 ppm). The presence of the oil had only a slight effect on stabilization efficiency, and its influence on properties is more beneficial than harmful. It decreases interactions among polyphenol molecules, improves the processability of the polymer, and increases homogeneity slightly. Accordingly, an extraction step can be saved during the preparation of the product, thus offering an economic advantage. © 2024 The Author(s) LA - English DB - MTMT ER - TY - JOUR AU - May, Nóra Veronika AU - Gál, Gyula Tamás AU - Holczbauer, Tamás AU - Nagyné Bereczki, Laura AU - Di Marco, Valerio B. AU - Bombicz, Petra TI - Gradual Changes in the Aromaticity in a Series of Hydroxypyridine-Carboxylic Acid Derivatives and Their Effect on Tautomerism and Crystal Packing JF - CRYSTAL GROWTH & DESIGN J2 - CRYST GROWTH DES VL - 24 PY - 2024 IS - 3 SP - 1096 EP - 1109 PG - 14 SN - 1528-7483 DO - 10.1021/acs.cgd.3c01118 UR - https://m2.mtmt.hu/api/publication/34616122 ID - 34616122 AB - The keto-enol tautomerism of hydroxypyridine-carboxylic acid (HPC) derivatives with proton transfer between the hydroxyl or carboxyl oxygen atoms was investigated in the case of three 3-hydroxy-4-pyridine-carboxylic acid (3HPC) and eight 4-hydroxy-3-pyridine-carboxylic acid (4HPC) derivatives containing altered pyridine ring substituents. Due to the vicinal position of hydroxyl and carboxylate groups, the hydroxyl proton is involved in an intramolecular H-bond and can very easily transform into the keto or enol tautomer. The proton position was found to correlate with the aromaticity of the pyridine ring, which was described by the Bird index, calculated on the basis of the measured atomic distances. Due to the planar shape of the molecules, pi & sdot;& sdot;& sdot;pi stacking and/or C-O & sdot;& sdot;& sdot;pi interactions were found in all investigated compounds. The molecular properties along with their main supramolecular interactions were compared. Packing arrangements and the main hydrogen-bonding schemes were further compared by using Hirshfeld surface analysis. In the case of the four N-methyl-substituted 4HPC derivatives, the synthon consisting of hydrogen bonds was preserved in the plane of the molecules despite the presence of the various ring substituents. Pairing the 3HPC and 4HPC derivatives, the corresponding compounds exhibited the same molecular shape but different nitrogen positions in the pyridine ring. This gave us the opportunity to examine how the difference in the electron distribution affects only and exclusively the secondary interactions and the arrangement of the molecules in the crystals. The electrostatic potential was calculated and mapped over the Hirshfeld surface, and the calculations of pairwise interaction energies and total energy frameworks were performed using the B3LYP/6-31G-(d,p) energy model. LA - English DB - MTMT ER -