TY - JOUR AU - Masa, Roland AU - Pelsőczi-Kovács, István AU - Aigner, Zoltán AU - Oszkó, Albert Zoltán AU - Turzó, Kinga Mónika AU - Ungvári, Krisztina TI - Surface Free Energy and Composition Changes and Ob Cellular Response to CHX-, PVPI-, and ClO2-Treated Titanium Implant Materials JF - JOURNAL OF FUNCTIONAL BIOMATERIALS J2 - J FUNCT BIOMATER VL - 13 PY - 2022 IS - 4 PG - 11 SN - 2079-4983 DO - 10.3390/jfb13040202 UR - https://m2.mtmt.hu/api/publication/33215364 ID - 33215364 N1 - Department of Oral Biology and Experimental Dental Research, Faculty of Dentistry, University of Szeged, Tisza Lajos krt. 64, Szeged, H-6720, Hungary Department of Prosthodontics, Faculty of Dentistry, University of Szeged, Tisza Lajos krt. 64, Szeged, H-6720, Hungary Institute of Pharmaceutical Technology and Regulatory Affairs, Faculty of Pharmacy, University of Szeged, Zrínyi u. 9., Szeged, H-6720, Hungary ELI-HU Non-Profit Ltd., Wolfgang Sandner u. 3., Szeged, H-6728, Hungary Dental School, Medical Faculty, University of Pécs, Tüzér u. 1, Pécs, H-7623, Hungary Export Date: 04 January 2024; Cited By: 1; Correspondence Address: K. Turzó; Dental School, Medical Faculty, University of Pécs, Pécs, Tüzér u. 1, H-7623, Hungary; email: turzo.kinga@pte.hu AB - The study evaluated the interaction of a titanium dental implant surface with three different antibacterial solutions: chlorhexidine, povidone-iodine, and chlorine dioxide. Implant surface decontamination is greatly challenging modern implant dentistry. Alongside mechanical cleaning, different antibacterial agents are widely used, though these could alter implant surface properties. Commercially pure (CP) grade 4 titanium (Ti) discs were treated with three different chemical agents (chlorhexidine 0.2% (CHX), povidone-iodine 10% (PVPI), chlorine dioxide 0.12% (ClO2)) for 5 min. Contact angle measurements, X-ray photoelectron spectroscopy (XPS) analysis, and cell culture studies were performed. Attachment and proliferation of primary human osteoblast cells were investigated via MTT (dimethylthiazol–diphenyl tetrazolium bromide), alamarBlue, LDH (lactate dehydrogenase), and fluorescent assays. Contact angle measurements showed that PVPI-treated samples (Θ = 24.9 ± 4.1) gave no difference compared with controls (Θ = 24.6 ± 5.4), while CHX (Θ = 47.2 ± 4.1) and ClO2 (Θ = 39.2 ± 9.8) treatments presented significantly higher Θ values. All samples remained in the hydrophilic region. XPS analysis revealed typical surface elements of CP grade 4 titanium (Ti, O, and C). Both MTT and alamarBlue cell viability assays showed similarity between treated and untreated control groups. The LDH test revealed no significant difference, and fluorescent staining confirmed these results. Although there was a difference in surface wettability, a high proliferation rate was observed in all treated groups. The in vitro study proved that CHX, PVPI, and ClO2 are proper candidates as dental implant decontamination agents. LA - English DB - MTMT ER - TY - JOUR AU - Varga, Tamás AU - Vásárhelyi, Lívia AU - Ballai, Gergő AU - Haspel, Henrik AU - Oszkó, Albert Zoltán AU - Kukovecz, Ákos AU - Kónya, Zoltán TI - Noble-Metal-Free Iron Nitride/Nitrogen-Doped Graphene Composite for the Oxygen Reduction Reaction JF - ACS OMEGA J2 - ACS OMEGA VL - 4 ET - 0 PY - 2019 IS - 1 SP - 130 EP - 139 PG - 10 SN - 2470-1343 DO - 10.1021/acsomega.8b02646 UR - https://m2.mtmt.hu/api/publication/30371387 ID - 30371387 LA - English DB - MTMT ER - TY - JOUR AU - László, Balázs AU - Baán, Kornélia AU - Ferencz, Zsuzsa AU - Galbács, Gábor AU - Oszkó, Albert Zoltán AU - Kónya, Zoltán AU - Kiss, János AU - Erdőhelyi, András TI - Gold size effect in the thermal-induced reaction of CO2 and H2 on titania- and titanate nanotube-supported gold catalysts JF - JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY J2 - J NANOSCI NANOTECHNO VL - 19 ET - 0 PY - 2019 IS - 1 SP - 470 EP - 477 PG - 8 SN - 1533-4880 DO - 10.1166/jnn.2019.15772 UR - https://m2.mtmt.hu/api/publication/3356867 ID - 3356867 AB - In this paper, we study the thermal activation of CO2 on the surface of small Au nanoparticles supported on TiO2 and titanate nanotube. We characterize the catalysts with high resolution transmission electron microscopy (HR-TEM) and total gold content measurement. We performed catalytic test in flow reactors then we investigate the surface of the catalysts during the adsorption and reaction processes by diffuse reflectance infrared spectroscopy (DRIFTS). The size of gold nanoparticles on the surface has been found to have the most important effect on the final activity of the studied catalysts. Significantly higher TOF values were obtained when the size of Au were smaller on both TiO2 and titanate nanotube supports. The size of the Au nanoparticles with the method of their preparation was controlled. The gold adatom promotes the adsorption and scission of CO2, but the nature of the support has got important effect, too. The explored reaction schemes may pave the way towards novel catalytic materials that can solve challenges associated with the activation of CO2 and thus contribute to a greener chemistry related to it. LA - English DB - MTMT ER - TY - CONF AU - Masa, Roland AU - Pelsőczi-Kovács, István AU - Aigner, Zoltán AU - Oszkó, Albert Zoltán AU - Turzó, Kinga Mónika AU - Ungvári, Krisztina TI - Primer oszteoblaszt sejtek vizsgálata periimplantitisz terápiájában használt fertőtlenítő szerekkel kezelt titán felszínen T2 - Translational interactive hands-on training and conference on epithelial ion transport including two symposia: "Antibacterial and mucolytic therapy in cystic fibrosis" and "Research in oral cavity – from basic science to clinical use" PY - 2018 SP - 74 UR - https://m2.mtmt.hu/api/publication/30421498 ID - 30421498 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Popa, Alexandru AU - Sasca, Viorel AU - Verdes, Orsina AU - Oszkó, Albert Zoltán TI - Preparation and catalytic properties of cobalt salts of Keggin type heteropolyacids supported on mesoporous silica JF - CATALYSIS TODAY J2 - CATAL TODAY VL - 306 PY - 2018 SP - 233 EP - 242 PG - 10 SN - 0920-5861 DO - 10.1016/j.cattod.2017.02.045 UR - https://m2.mtmt.hu/api/publication/27567387 ID - 27567387 LA - English DB - MTMT ER - TY - JOUR AU - László, Balázs AU - Baán, Kornélia AU - Oszkó, Albert Zoltán AU - Erdőhelyi, András AU - Kiss, János AU - Kónya, Zoltán TI - Hydrogen evolution in the photocatalytic reaction between methane and water in the presence of CO2 on titanate and titania supported Rh and Au catalysts JF - TOPICS IN CATALYSIS J2 - TOP CATAL VL - 61 PY - 2018 IS - 9-11 SP - 875 EP - 888 PG - 14 SN - 1022-5528 DO - 10.1007/s11244-018-0936-z UR - https://m2.mtmt.hu/api/publication/3360073 ID - 3360073 AB - The photocatalytic transformation of methane-water mixture over Rh and Au catalysts supported on protonated (H-form) titanate nanotube (TNT) was investigated. The role of the catalyst structure was analyzed using titania reference support. Furthermore the effect of carbon-dioxide addition was also investigated. The catalysts were characterized by high resolution transmission electron microscopy and X-ray photoelectron spectroscopy (XPS). Photocatalytic tests were performed with a mercury-arc UV source illuminating a continuous flow quartz reactor which was attached to a mass spectrometer. The surface of the catalysts was analyzed by diffuse reflectance infrared spectroscopy during the photoreactions. The changes of the catalysts due to photocatalytic usage were investigated by XPS and temperature programmed reduction methods as well. Most of the methane was generally transformed to hydrogen and ethane, and a small amount of methanol was also formed. The carbon dioxide addition enhanced the rate of the photocatalytic transformation of methane on Rh/TNT with increasing the lifetime of the electron-hole pairs. Bigger gold particles with mainly plasmonic character were more active in the reactions due to the photo induced activation of the adsorbed water. Surface carbon deposits were identified on the catalysts after the photoreactions. More oxidized carbon formed on the Au-containing catalysts than on the ones with Rh. LA - English DB - MTMT ER - TY - JOUR AU - Rabelo-Neto, RC AU - Sales, HBE AU - Inocencio, CVM AU - Varga, Erika AU - Oszkó, Albert Zoltán AU - Erdőhelyi, András AU - Noronha, FB AU - Mattos, LV TI - CO2 reforming of methane over supported LaNiO3 perovskite-type oxides JF - APPLIED CATALYSIS B-ENVIRONMENTAL J2 - APPL CATAL B-ENVIRON VL - 221 PY - 2018 SP - 349 EP - 361 PG - 13 SN - 0926-3373 DO - 10.1016/j.apcatb.2017.09.022 UR - https://m2.mtmt.hu/api/publication/3322608 ID - 3322608 N1 - Instituto Nacional de Tecnologia, Av. Venezuela 82, Rio de Janeiro, 20081-312, Brazil Universidade Federal Fluminense, Rua Passo da Pátria 156, Niterói, 24210-240, Brazil Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vértanúk tere 1, Szeged, H-6720, Hungary Cited By :36 Export Date: 24 September 2019 CODEN: ACBEE Correspondence Address: Mattos, L.V.; Instituto Nacional de Tecnologia, Av. Venezuela 82, Brazil; email: lisianemattos@yahoo.com.br Funding details: Conselho Nacional de Desenvolvimento Científico e Tecnológico Funding details: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Funding details: Conselho Nacional de Desenvolvimento Científico e Tecnológico Funding text 1: The authors thank CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior) for supporting this research and the scholarship received. LA - English DB - MTMT ER - TY - JOUR AU - Ferencz, Zsuzsa AU - Varga, Erika AU - Puskás, Róbert AU - Kónya, Zoltán AU - Baán, Kornélia AU - Oszkó, Albert Zoltán AU - Erdőhelyi, András TI - Reforming of ethanol on Co/Al2O3 catalysts reduced at different temperatures JF - JOURNAL OF CATALYSIS J2 - J CATAL VL - 358 PY - 2018 SP - 118 EP - 130 PG - 13 SN - 0021-9517 DO - 10.1016/j.jcat.2017.12.003 UR - https://m2.mtmt.hu/api/publication/3305513 ID - 3305513 AB - Abstract The steam reforming of ethanol was studied at 823 K on 10% Co/Al2O3 samples calcined at 973 K and reduced at different temperatures from 773 K to 1173 K. The catalysts were characterized by XPS, XRD, TPR, Raman and DRIFT spectroscopy. XRD results revealed that spinel structures are detectable after the thermal treatment of Co/Al2O3, which could be attributed mainly to Co3O4 formation. TPR and XPS measurements show that even the high temperature (1173 K) reduction is not sufficient to totally reduce Co to metallic state. The ethanol conversion at 823 K was relatively stable and it was higher than 90% in all cases, but the product distribution as a function of time on stream significantly depended on the reduction temperature. The selectivities of H2, CO2, and CH4 formation decreased in time but those of ethylene, acetone and acetaldehyde increased. The changes became less pronounced when the reduction temperature increased, so the H2, CO, and CO2 selectivities increased while that of ethylene decreased significantly as a function of reduction temperature. XPS measurements revealed a new low binding energy state in the Co 2p3/2 region during the reaction when the samples were reduced at or below 973 K. This feature was assigned to the formation of a very thin Co layer. On the used catalysts reduced at or above 973 K structured carbon was detected. On the XP spectra several carbon species were identified at the beginning of the reaction. A new feature was also found at lower binding energy which became more and more dominant with the exception of Co/Al2O3 reduced at 1173 K. These species could be assigned as CoCx carbide-like structures rather than a structured carbon layer. It was found that the surface carbon formed in the reaction gradually influences the product distribution. The carbon which probably is built in the Co subsurface poisons the reactivity of the metal and the effect of the support comes in the forefront. The structured carbon layer formed on the Co/Al2O3 reduced at high temperature does not influence the hydrogen formation in the ethanol reforming. LA - English DB - MTMT ER - TY - JOUR AU - Farkas, Balázs AU - P, Heszler AU - Budai, Judit AU - Oszkó, Albert Zoltán AU - M, Ottosson AU - Geretovszky, Zsolt TI - Optical, compositional and structural properties of pulsed laser deposited nitrogen-doped Titanium-dioxide JF - APPLIED SURFACE SCIENCE J2 - APPL SURF SCI VL - 433 ET - 0 PY - 2018 SP - 149 EP - 154 PG - 6 SN - 0169-4332 DO - 10.1016/j.apsusc.2017.09.181 UR - https://m2.mtmt.hu/api/publication/3288018 ID - 3288018 LA - English DB - MTMT ER - TY - GEN AU - Masa, Roland AU - Pelsőczi-Kovács, István AU - Aigner, Zoltán AU - Oszkó, Albert Zoltán AU - Turzó, Kinga Mónika AU - Ungvári, Krisztina TI - Primer oszteoblaszt sejtek vizsgálata periimplantitiszben használt fertőtlenítő szerekkel kezelt titán felszínen PY - 2017 UR - https://m2.mtmt.hu/api/publication/3319927 ID - 3319927 LA - Hungarian DB - MTMT ER -