TY - JOUR AU - Meiszterics, Zoltán AU - Kiss, András AU - Nagy, Lívia AU - Zsebe, Tamás AU - Vasvári, Gyula Ferenc AU - Csonka, Dávid Ciprián AU - Nagy, Géza TI - Investigation of the regeneration of the passive surface oxide layer of TiAl6V4 alloy printed by WAAM technology using different electrochemical test methods JF - ELECTROANALYSIS J2 - ELECTROANAL VL - 35 PY - 2023 IS - 6 PG - 6 SN - 1040-0397 DO - 10.1002/elan.202200506 UR - https://m2.mtmt.hu/api/publication/33914866 ID - 33914866 AB - The kinetics of oxide layer formation on surface of Ti6Al4V alloy samples is a very important property especially if their application as medical implants is planned. Damaged protective surface layer usually heals in ambient condition however; during the self-healing process toxic species can get into the surrounding living tissue. In our experiment the kinetics of the healing process proceeding at 3D printed alloy surface has been studied using electrochemical methods, among them scanning electrochemical microscopy. More than 40 min. time period was found long enough for total healing. LA - English DB - MTMT ER - TY - JOUR AU - Muthuri, Lawrence Kinyua AU - Nagy, Lívia AU - Nagy, Géza TI - Chemically modified pencil electrodes for application in reagentless chronopotentiometric antioxidant activity measurement JF - ELECTROANALYSIS J2 - ELECTROANAL VL - 35 PY - 2023 IS - 6 SN - 1040-0397 DO - 10.1002/elan.202200505 UR - https://m2.mtmt.hu/api/publication/33728598 ID - 33728598 LA - English DB - MTMT ER - TY - JOUR AU - Asserghine, Abdelilah AU - Filotás, Dániel AU - Nagy, Lívia AU - Souto, R.M. AU - Nagy, Géza TI - Do titanium biomaterials get immediately and entirely repassivated? A perspective JF - NPJ MATERIALS DEGRADATION J2 - NPJ MATER DEGRAD VL - 6 PY - 2022 IS - 1 PG - 5 SN - 2397-2106 DO - 10.1038/s41529-022-00270-0 UR - https://m2.mtmt.hu/api/publication/33037473 ID - 33037473 N1 - perspective LA - English DB - MTMT ER - TY - JOUR AU - Filotás, Dániel AU - Izquierdo, Javier AU - Fernandez-Perez, Bibiana M. AU - Nagy, Lívia AU - Nagy, Géza AU - Souto, Ricardo M. TI - Contributions of Microelectrochemical Scanning Techniques for the Efficient Detection of Localized Corrosion Processes at the Cut Edges of Polymer-Coated Galvanized Steel JF - MOLECULES J2 - MOLECULES VL - 27 PY - 2022 IS - 7 PG - 17 SN - 1420-3049 DO - 10.3390/molecules27072167 UR - https://m2.mtmt.hu/api/publication/32803701 ID - 32803701 N1 - Funding Agency and Grant Number: ERASMUS+ program; Canary Agency for Research, Innovation and Information Society (Las Palmas de Gran Canaria, Spain); European Social Fund (Brussels, Belgium)European Social Fund (ESF); Spanish Ministry of Economy and Competitiveness (MINECO, Madrid, Spain)Spanish Government; European Regional Development Fund (Brussels, Belgium) [CTQ2016-80522-P]; International Visegrad Fund (Bratislava, Slovakia) [22020140]; Hungarian Research Grant NFKI (Budapest, Hungary) [125244] Funding text: D.F. acknowledges a 2-month mobility grant to the University of La Laguna funded by the ERASMUS+ program, and B.M.F.-P. thanks the Canary Agency for Research, Innovation and Information Society (Las Palmas de Gran Canaria, Spain) and the European Social Fund (Brussels, Belgium) for a research contract.; The work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO, Madrid, Spain) and the European Regional Development Fund (Brussels, Belgium) under grant CTQ2016-80522-P, the Hungarian Research Grant NFKI Nr 125244 (Budapest, Hungary), and the International Visegrad Fund project number 22020140 (Bratislava, Slovakia). AB - Spatially resolved information on corrosion reactions operating at the cut edges of coated metals can be obtained using microelectrochemical scanning techniques using a suitable selection of operation modes and scanning probes. The scanning vibrating electrode technique (SVET) provides current density maps with a spatial resolution of the order of the dimensions of the sample, which allows the temporal evolution of the corrosion reactions to be followed over time. This leads to the identification and localization of cathodic and anodic sites, although the technique lacks chemical specificity for the unequivocal identification of the reactive species. The application of scanning electrochemical microscopy (SECM) was previously limited to image cathodic reaction sites, either due to oxygen consumption in the amperometric operation or by the alkalinisation of the electrolyte in potentiometric operation. However, it is shown that anodic sites can be effectively monitored using an ion-selective microelectrode (ISME) as a probe. The ISME probes detected differences in the local concentrations of Zn2+ and OH- ions from the cut edges of a complete coil coating system compared to the same system after the polymeric layers were removed. In this way, it has been shown that the inhibitor loading in the polymer layers effectively contributes to reducing the corrosion rates at the cut edge, thus helping to extend the useful life of the sacrificial galvanized layer bonded directly to the steel matrix. Additionally, these two probe configurations can be integrated into a multi-electrode tip for potentiometric operation to simultaneously monitor localized changes in pH values and metal ion dissolution in a single scan. Spatial and temporal distributions were further investigated using different rastering procedures, and the potential of constructing pseudomaps for 2D-imaging is described. LA - English DB - MTMT ER - TY - JOUR AU - Muthuri, Lawrence Kinyua AU - Nagy, Lívia AU - Nagy, Géza TI - Evaluating the antioxidant activity of different species using a novel reagentless chronopotentiometric method JF - ELECTROCHEMISTRY COMMUNICATIONS J2 - ELECTROCHEM COMMUN VL - 139 PY - 2022 PG - 8 SN - 1388-2481 DO - 10.1016/j.elecom.2022.107311 UR - https://m2.mtmt.hu/api/publication/33037533 ID - 33037533 LA - English DB - MTMT ER - TY - JOUR AU - Meiszterics, Zoltán AU - Kiss, András AU - Filotás, Dániel AU - Asserghine, Abdelilah AU - Nagy, Lívia AU - Nagy, Géza TI - Pásztázó Elektrokémiai Mikroszkópiás (PEKM) módszer fejlesztése és alkalmazása korróziós folyamatok tanulmányozására JF - MAGYAR KÉMIAI FOLYÓIRAT - KÉMIAI KÖZLEMÉNYEK (1997-) J2 - MAGY KÉM FOLY KÉM KÖZL VL - 128 PY - 2022 IS - 2 SP - 79 EP - 85 PG - 7 SN - 1418-9933 DO - 10.24100/MKF.2022.02.79 UR - https://m2.mtmt.hu/api/publication/33090460 ID - 33090460 N1 - "A munkát az NKFIH (OTKA) K 125244 számú pályázat alapján az NKFIH támogatta." LA - Hungarian DB - MTMT ER - TY - CHAP AU - Szabó, Evelin AU - Kovács, Anita AU - Nagy, Lívia AU - Nagy, Géza AU - Zelena, Dóra AU - Lénárd, László ED - Kajos, Luca Fanni ED - Bali, Cintia ED - Puskás, Tamás ED - Polgár, Petra Ibolya ED - Glázer-Kniesz, Adrienn ED - Tislér, Ádám ED - Kovács, Eszter TI - Utilizing an electrochemical method in preclinical research - enzyme based amperometric biosensor T2 - XI. Interdiszciplináris Doktorandusz Konferencia 2022. november 25-26 = 11th Interdisciplinary Doctoral Conference 25-26th of November 2022 PB - Pécsi Tudományegyetem Doktorandusz Önkormányzat CY - Pécs SN - 9789636260699 PY - 2022 SP - 203 PG - 1 UR - https://m2.mtmt.hu/api/publication/33558725 ID - 33558725 LA - English DB - MTMT ER - TY - JOUR AU - Asserghine, Abdelilah AU - Ashrafi, Amir M. AU - Mukherjee, Atripan AU - Petrlak, Frantisek AU - Heger, Zbynek AU - Svec, Pavel AU - Richtera, Lukas AU - Nagy, Lívia AU - Souto, Ricardo M. AU - Nagy, Géza AU - Adam, Vojtech TI - In Situ Investigation of the Cytotoxic and Interfacial Characteristics of Titanium When Galvanically Coupled with Magnesium Using Scanning Electrochemical Microscopy JF - ACS APPLIED MATERIALS & INTERFACES J2 - ACS APPL MATER INTER VL - 13 PY - 2021 IS - 36 SP - 43587 EP - 43596 PG - 10 SN - 1944-8244 DO - 10.1021/acsami.1c10584 UR - https://m2.mtmt.hu/api/publication/32290048 ID - 32290048 N1 - Funding Agency and Grant Number: project CEITEC 2020 [LQ1601]; Ministry of Education, Youth and Sports of the Czech Republic under the National Sustainability Program II; ERDF "Multidisciplinary research to increase application potential of nanomaterials in agricultural practice" [CZ.02.1.01/0.0/0.0/16_025/0007314]; Hungarian Research Grant NFKI (Budapest, Hungary) [125244]; ERASMUS + Staff Mobility from the European Commission Funding text: This research was carried out under the project CEITEC 2020 (LQ1601) with financial support from the Ministry of Education, Youth and Sports of the Czech Republic under the National Sustainability Program II. Additionally, it was supported by ERDF "Multidisciplinary research to increase application potential of nanomaterials in agricultural practice" (No. CZ.02.1.01/0.0/0.0/16_025/0007314). Furthermore, the support from the Hungarian Research Grant NFKI Nr. 125244 (Budapest, Hungary) is acknowledged. The authors also gratefully acknowledge financial support from ERASMUS + Staff Mobility from the European Commission. AB - Recently, the cytotoxic properties of galvanically coupled Ti-Mg particles have been shown in different cells. This cytotoxic effect has been attributed mainly to Mg due to its tendency to undergo activation when coupled with Ti, forming a galvanic cell consisting of an anode (Mg) and a cathode (Ti). However, the role of the Ti cathode has been ignored in explaining the cytotoxic effect of Ti-Mg particles due to its high resistance to corrosion. In this work, the role of titanium (Ti) in the cytotoxic mechanism of galvanically coupled Ti-Mg particles was examined. A model galvanic cell (MGC) was prepared to simulate the Mg-Ti particles. The electrochemical reactivity of the Ti sample and the pH change in it due to galvanic coupling with Mg were investigated using scanning electrochemical microscopy (SECM). It was observed that the Ti surface changed from passive to electrochemically active when coupled with Mg. Furthermore, after only 15 min of galvanic coupling with Mg, the pH in the electrolyte volume adjacent to the Ti surface increased to an alkaline pH value. The effects of the galvanic coupling of Ti and Mg, as well as those of the alkaline pH environment, on the viability of Hs27 fibroblast cells were investigated. It was shown that the viability of Hs27 cells significantly diminished when Mg and Ti were galvanically coupled compared to when the two metals were electrically disconnected. Thus, although Ti usually exhibited high corrosion resistance when exposed to physiological environments, an electrochemically active surface was observed when galvanically coupled with Mg, and this surface may participate in electron transfer reactions with chemical species in the neighboring environment; this participation resulted in the increased pH values above its surface and enhanced generation of reactive oxygen species. These features contributed to the development of cytotoxic effects by galvanically coupled Ti-Mg particles. LA - English DB - MTMT ER - TY - JOUR AU - Filotás, Dániel AU - Nagy, Lívia AU - Nagy, Géza AU - Souto, R.M. TI - New insights on the influence of aluminum on the anomalous hydrogen evolution of anodized magnesium using scanning electrochemical microscopy JF - ELECTROCHIMICA ACTA J2 - ELECTROCHIM ACTA VL - 391 PY - 2021 PG - 5 SN - 0013-4686 DO - 10.1016/j.electacta.2021.138915 UR - https://m2.mtmt.hu/api/publication/32127211 ID - 32127211 LA - English DB - MTMT ER - TY - JOUR AU - Filotás, Dániel AU - Fernández-Pérez, B.M. AU - Nagy, Lívia AU - Nagy, Géza AU - Souto, R.M. TI - Investigation of anomalous hydrogen evolution from anodized magnesium using a polarization routine for scanning electrochemical microscopy JF - JOURNAL OF ELECTROANALYTICAL CHEMISTRY J2 - J ELECTROANAL CHEM VL - 895 PY - 2021 PG - 9 SN - 1572-6657 DO - 10.1016/j.jelechem.2021.115538 UR - https://m2.mtmt.hu/api/publication/32127203 ID - 32127203 LA - English DB - MTMT ER -