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 - Marek, Tamás AU - Vincze, Tomáš AU - Szabó, Tamás AU - Keresztes, Zsófia TI - Conductive and photo-luminescent functionality of reconstituted particle layers prepared from electrodeposited PEDOT films JF - MATERIALS CHEMISTRY AND PHYSICS J2 - MATER CHEM PHYS VL - 314 PY - 2024 PG - 8 SN - 0254-0584 DO - 10.1016/j.matchemphys.2024.128925 UR - https://m2.mtmt.hu/api/publication/34502195 ID - 34502195 LA - English DB - MTMT ER - TY - JOUR AU - Machairas, Vassilis AU - Anagnostoupoulos, Andreas AU - Soulis, Dionysios AU - Economou, Anastasios AU - Jakab, Kristóf AU - Melios, Nikitas AU - Keresztes, Zsófia AU - Tsekenis, George AU - Wang, Joseph AU - Speliotis, Thanassis TI - Microfabricated Gold Aptasensors for the Label-Free Electrochemical Assay of Oxytetracycline Residues in Milk JF - ENGINEERING PROCEEDINGS J2 - ENGENG PROC VL - 58 PY - 2023 IS - 1 PG - 6 SN - 2673-4591 DO - 10.3390/ecsa-10-16018 UR - https://m2.mtmt.hu/api/publication/34502129 ID - 34502129 LA - English DB - MTMT ER - TY - JOUR AU - Mara, Józsefné AU - Bodnár, Attila-Ede AU - Trif, László AU - Telegdi, Lászlóné TI - Development of Effective Infrared Reflective Coatings JF - APPLIED SCIENCES-BASEL J2 - APPL SCI-BASEL VL - 13 PY - 2023 IS - 23 PG - 15 SN - 2076-3417 DO - 10.3390/app132312903 UR - https://m2.mtmt.hu/api/publication/34412528 ID - 34412528 AB - The adsorption of surfaces exposed to sunlight results in increased temperatures that can cause physical damage and an increase in energy consumption. Infrared reflective coatings can keep objects cooler and have significant benefits in a wide variety of application by reflecting infrared light and decreasing heat, reducing operating costs, improving energy efficiency in buildings and vehicles, and extending an objects’ lifespan. The main aim of our research was to develop coatings in a RAL7016 Anthracite grey color with minimum heat adsorption in the infrared wavelength range. This was achieved using a combination of infrared transparent and infrared reflective pigment built-in coatings applied on two primers: white and black. Infrared reflectivity or transparency, as well as surface temperature, was investigated as a function of the composition and concentration of pigments. These coatings were characterized by chromatic parameters, by total solar and infrared solar reflectance in the UV, visible, and infrared wavelength range, and by heat reflection. Among the coatings developed, two produced very effective controls for infrared reflectance and transparency, and they could control heat reflectance, resulting in a significant decrease in surface temperature. LA - English DB - MTMT ER - TY - JOUR AU - Pajkossy, Tamás TI - Determination of Electrode Kinetics Parameters from Dynamic Electrochemical Impedance Spectroscopy Measurements via Potential-Program Invariant Functions JF - JOURNAL OF PHYSICAL CHEMISTRY LETTERS J2 - J PHYS CHEM LETT VL - 14 PY - 2023 SP - 10599 EP - 10608 PG - 10 SN - 1948-7185 DO - 10.1021/acs.jpclett.3c02810 UR - https://m2.mtmt.hu/api/publication/34373745 ID - 34373745 LA - English DB - MTMT ER - TY - JOUR AU - Kocsisné Pfeifer, Éva AU - Mink, János AU - Gyurika, István Gábor AU - Telegdi, Lászlóné TI - Effect of heat treatment on the structure of self-assembled undecenyl phosphonic aicd layers developed on different stainless steel surfaces JF - HUNGARIAN JOURNAL OF INDUSTRY AND CHEMISTRY J2 - HUNG J IND CHEM VL - 51 PY - 2023 IS - 2 SP - 7 EP - 14 PG - 8 SN - 0133-0276 DO - 10.33927/hjic-2023-12 UR - https://m2.mtmt.hu/api/publication/34213219 ID - 34213219 LA - English DB - MTMT ER - TY - JOUR AU - Jakab, Kristóf AU - Melios, Nikitas AU - Tsekenis, George AU - Shaban, Abdul AU - Horváth, Viola AU - Keresztes, Zsófia TI - Comparative Analysis of pH and Target-Induced Conformational Changes of an Oxytetracycline Aptamer in Solution Phase and Surface-Immobilized Form JF - BIOMOLECULES J2 - BIOMOLECULES VL - 13 PY - 2023 IS - 9 PG - 15 SN - 2218-273X DO - 10.3390/biom13091363 UR - https://m2.mtmt.hu/api/publication/34135928 ID - 34135928 AB - To date, numerous aptamer-based biosensing platforms have been developed for sensitive and selective monitoring of target analytes, relying on analyte-induced conformational changes in the aptamer for the quantification of the analyte and the conversion of the binding event into a measurable signal. Despite the impact of these conformational rearrangements on sensor performance, the influence of the environment on the structural conformations of aptamers has rarely been investigated, so the link between parameters directly influencing aptamer folding and the ability of the aptamer to bind to the target analyte remains elusive. Herein, the effect a number of variables have on an aptamer’s 3D structure was examined, including the pH of the buffering medium, as well as the anchoring of the aptamer on a solid support, with the use of two label-free techniques. Circular dichroism spectroscopy was utilized to study the conformation of an aptamer in solution along with any changes induced to it by the environment (analyte binding, pH, composition and ionic strength of the buffer solution), while quartz crystal microbalance with dissipation monitoring was employed to investigate the surface-bound aptamer’s behavior and performance. Analysis was performed on an aptamer against oxytetracycline, serving as a model system, representative of aptamers selected against small molecule analytes. The obtained results highlight the influence of the environment on the folding and thus analyte-binding capacity of an aptamer and emphasize the need to deploy appropriate surface functionalization protocols in sensor development as a means to minimize the steric obstructions and undesirable interactions of an aptamer with a surface onto which it is tethered. LA - English DB - MTMT ER - TY - JOUR AU - Kocsisné Pfeifer, Éva AU - Gyurika, István Gábor AU - Telegdi, Lászlóné TI - Anticorrosion activity of Phosphonic acid amphiphile in self-assembled molecular layer JF - INTERNATIONAL JOURNAL OF CORROSION AND SCALE INHIBITION J2 - INTJ CORROS SCALE INHIB VL - 12 PY - 2023 IS - 3 SP - 1261 EP - 1274 PG - 14 SN - 2305-6894 DO - 10.17675/2305-6894-2023-12-3-25 UR - https://m2.mtmt.hu/api/publication/34135710 ID - 34135710 LA - English DB - MTMT ER - TY - JOUR AU - Samaniego Andrade, Samantha Kathiuska AU - SHIVA SHANKAR, LAKSHMI AU - Bakos, István AU - Klébert, Szilvia AU - Kun, Róbert AU - Mohai, Miklós AU - Nagy, Balázs AU - Nagyné László, Krisztina TI - The Influence of Reduced Graphene Oxide on the Texture and Chemistry of N,S-Doped Porous Carbon. Implications for Electrocatalytic and Energy Storage Applications JF - NANOMATERIALS J2 - NANOMATERIALS-BASEL VL - 13 PY - 2023 IS - 16 PG - 22 SN - 2079-4991 DO - 10.3390/nano13162364 UR - https://m2.mtmt.hu/api/publication/34106212 ID - 34106212 N1 - Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budapest, 1521, Hungary Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, Budapest, 1117, Hungary Department of Chemical and Environmental Process Engineering, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budapest, 1521, Hungary H-Ion Research, Development and Innovation Ltd, Konkoly-Thege út 29-33, Budapest, 1121, Hungary Export Date: 4 September 2023 Correspondence Address: László, K.; Department of Physical Chemistry and Materials Science, Hungary; email: laszlo.krisztina@vbk.bme.hu AB - In this work, we study the influence of reduced graphene oxide (rGO) on the morphology and chemistry of highly porous N,S-doped carbon cryogels. Simultaneously, we propose an easily upscalable route to prepare such carbons by adding graphene oxide (GO) in as-received suspended form to the aqueous solution of the ι-carrageenan and urea precursors. First, 1.25–5 wt% GO was incorporated into the dual-doped polymer matrix. The CO2, CO, and H2O emitted during the thermal treatments resulted in the multifaceted modification of the textural and chemical properties of the porous carbon. This facilitated the formation of micropores through self-activation and resulted in a substantial increase in the apparent surface area (up to 1780 m2/g) and pore volume (up to 1.72 cm3/g). However, adding 5 wt% GO led to overactivation. The incorporated rGO has an ordering effect on the carbon matrix. The evolving oxidative species influence the surface chemistry in a complex way, but sufficient N and S atoms (ca. 4 and >1 at%, respectively) were preserved in addition to the large number of developing defects. Despite the complexity of the textural and chemical changes, rGO increased the electrical conductivity monotonically. In alkaline oxygen reduction reaction (ORR) tests, the sample with 1.25 wt% GO exhibited a 4e− mechanism and reasonable stability, but a higher rGO content gradually compromised the performance of the electrodes. The sample containing 5 wt% GO was the most sensitive under oxidative conditions, but after stabilization it exhibited the highest gravimetric capacitance. In Li-ion battery tests, the coulombic efficiency of all the samples was consistently above 98%, indicating the high potential of these carbons for efficient Li-ion insertion and reinsertion during the charge–discharge process, thereby providing a promising alternative for graphite-based anodes. The cell from the 1.25 wt% GO sample showed an initial discharge capacity of 313 mAh/g, 95.1% capacity retention, and 99.3% coulombic efficiency after 50 charge–discharge cycles. LA - English DB - MTMT ER -