TY - JOUR AU - Ádám, Anna Adél AU - Ziegenheim, Szilveszter AU - Janovák, László AU - Szabados, Márton AU - Bús, Csaba AU - Kukovecz, Ákos AU - Kónya, Zoltán AU - Dékány, Imre AU - Sipos, Pál Miklós AU - Kutus, Bence TI - Binding of Ca2+ Ions to Alkylbenzene Sulfonates: Micelle Formation, Second Critical Concentration and Precipitation JF - MATERIALS J2 - MATERIALS VL - 16 PY - 2023 IS - 2 PG - 12 SN - 1996-1944 DO - 10.3390/ma16020494 UR - https://m2.mtmt.hu/api/publication/33543168 ID - 33543168 AB - Anionic surfactants, such as sodium linear alkylbenzene sulfonates (NaLAS), are utilized in various fields, including industry, household, and agriculture. The efficiency of their use in aqueous environments is significantly affected by the presence of cations, Ca2+ and Mg2+ in particular, as they can decrease the concentration of the surfactant due to precipitation. To understand cation–sulfonate interactions better, we study both NaLAS colloidal solutions in the presence of CaCl2 and precipitates forming at higher salt concentrations. Upon addition of CaCl2, we find the surface tension and critical micelle concentration of NaLAS to decrease significantly, in line with earlier findings for alkylbenzylsulfonates in the presence of divalent cations. Strikingly, an increase in the surface tension is discernible above 0.6 g L–1 NaLAS, accompanied by the decrease of apparent micelle sizes, which in turn gives rise to transparent systems. Thus, there appears to be a second critical concentration indicating another micellar equilibrium. Furthermore, the maximum salt tolerance of the surfactant is 0.1 g L–1 Ca2+, above which rapid precipitation occurs yielding sparingly soluble CaLAS2∙2H2O. LA - English DB - MTMT ER - TY - JOUR AU - Ágoston, Áron AU - Balog, Ádám AU - Narbutas, Šarūnas AU - Dékány, Imre AU - Janovák, László TI - Optimization of Plasmonic Copper Content at Copper-Modified Strontium Titanate (Cu-SrTiO3): Synthesis, Characterization, Photocatalytic Activity JF - CATALYSTS J2 - CATALYSTS VL - 12 PY - 2022 IS - 9 PG - 11 SN - 2073-4344 DO - 10.3390/catal12091041 UR - https://m2.mtmt.hu/api/publication/33169983 ID - 33169983 AB - Catalyst development still has a major impact on science today, as we can use catalysts to break down certain pollutants in an energy-efficient way. There is no comprehensive literature on the development of SrTiO3-based photocatalysts, so study in this area is justified. Related to this topic, here we report the facile preparation of surface-modified SrTiO3 photocatalyst, performed by plasmonic copper deposition. In the case of the copper-modified samples (0.25–3 wt.% Cu content), the photooxidation of phenol, as model contaminant, was almost 4–5 times higher than the bare SrTiO3. However, the photocatalytic activity was not linearly related to copper content, since the highest photoactivity was achieved at 1 wt.% copper content. The reason for the better activity was the plasmonic effect of copper, which increases the recombination time of charge separation on the catalyst surface. During slower recombination, more water is oxidized to hydroxyl radicals, which can lead to faster degradation of phenol. LA - English DB - MTMT ER - TY - JOUR AU - Kerek, Ádám AU - Sasvári, Mátyás AU - Jerzsele, Ákos AU - Somogyi, Zoltán AU - Janovák, László AU - Abonyi-Tóth, Zsolt AU - Dékány, Imre TI - Photoreactive Coating Material as an Effective and Durable Antimicrobial Composite in Reducing Bacterial Load on Surfaces in Livestock JF - BIOMEDICINES J2 - BIOMEDICINES VL - 10 PY - 2022 IS - 9 PG - 15 SN - 2227-9059 DO - 10.3390/biomedicines10092312 UR - https://m2.mtmt.hu/api/publication/33098545 ID - 33098545 AB - Titanium dioxide (TiO2) is a well-known photocatalytic compound that can be used to effectively reduce the presence of pathogens in human and animal hospitals via ROS release. The aim of this study was to investigate the efficacy of a polymer-based composite layer containing TiO2 and zinc oxide (ZnO) against Escherichia coli (E. coli) of animal origin. We showed that the photocatalyst coating caused a significant (p < 0.001) reduction in pathogen numbers compared to the control with an average reduction of 94% over 30 min. We used six light sources of different wattages (4 W, 7 W, 9 W, 12 W, 18 W, 36 W) at six distances (35 cm, 100 cm, 150 cm, 200 cm, 250 cm, 300 cm). Samples (n = 2160) were taken in the 36 settings and showed no significant difference in efficacy between light intensity and distance. We also investigated the influence of organic contaminant that resulted in lower activity as well as the effect of a water jet and a high-pressure device on the antibacterial activity. We found that the latter completely removed the coating from the surface, which significantly (p < 0.0001) reduced its antibacterial potential. As a conclusion, light intensity and distance does not reduce the efficacy of the polymer, but the presence of organic contaminants does. LA - English DB - MTMT ER - TY - JOUR AU - Imre-Deák, Ágota AU - Janovák, László AU - Tallósy, Szabolcs Péter AU - Godič-Torkar, Karmen AU - Abram, Anže AU - Dékány, Imre AU - Sebők, Dániel AU - Bohinc, Klemen TI - Synthesis of self-cleaning and photoreactive spherical layered double oxide/polymer composite thin layers: Biofouling and inactivation of bacteria JF - APPLIED CLAY SCIENCE J2 - APPL CLAY SCI VL - 228 PY - 2022 PG - 12 SN - 0169-1317 DO - 10.1016/j.clay.2022.106587 UR - https://m2.mtmt.hu/api/publication/32895864 ID - 32895864 N1 - University of Szeged, Department of Physical Chemistry and Materials Science, H-6720, Rerrich Béla tér 1, Szeged, Hungary University of Szeged, Institute of Surgical Research, H-6724, Pulz u. 1, Szeged, Hungary University of Ljubljana, Faculty of Health Sciences, Zdravstvena pot 5, Ljubljana, 1000, Slovenia Department for Nanostructured Materials, 'Jožef Stefan' Institute, Jamova cesta 39, Ljubljana, 1000, Slovenia Jožef Stefan International Postgraduate School, Jamova cesta 39, Ljubljana, 1000, Slovenia Department of Applied and Environmental Chemistry, University of Szeged, H-6720, Rerrich Béla tér 1, Szeged, Hungary Cited By :1 Export Date: 6 December 2022 CODEN: ACLSE Correspondence Address: Janovák, L.; University of Szeged, H-6720, Rerrich Béla tér 1, Hungary; email: janovakl@chem.u-szeged.hu Funding details: European Cooperation in Science and Technology, COST, STSM CM1101, UNKP-22-5 Funding details: Magyar Tudományos Akadémia, MTA Funding details: Javna Agencija za Raziskovalno Dejavnost RS, ARRS, P3-0388 Funding details: Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFIH, GINOP-2.1.7-15-2016-01987, GINOP-2.3.2-15-2016-00013 Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA Funding details: Innovációs és Technológiai Minisztérium Funding text 1: The authors are grateful for the financial assistance from the National Research, Development and Innovation Office ( GINOP-2.3.2-15-2016-00013 and GINOP-2.1.7-15-2016-01987 ) and from the COST Action STSM CM1101 . This paper was also supported by the UNKP-22-5 and UNKP-21-4 New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development and Innovation Fund and by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences . KB and KGT are very thankful for the Slovenian Research Agency for support through program P3-0388 . All these supports are highly appreciated. Funding text 2: The authors are grateful for the financial assistance from the National Research, Development and Innovation Office (GINOP-2.3.2-15-2016-00013 and GINOP-2.1.7-15-2016-01987) and from the COST Action STSM CM1101. This paper was also supported by the UNKP-22-5 and UNKP-21-4 New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development and Innovation Fund and by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences. KB and KGT are very thankful for the Slovenian Research Agency for support through program P3-0388. All these supports are highly appreciated. LA - English DB - MTMT ER - TY - JOUR AU - Abdelghafour, Mohamed M. AU - Imre-Deák, Ágota AU - Szabó, Diána AU - Dékány, Imre AU - Rovó, László AU - Janovák, László TI - Use of Self-Assembled Colloidal Prodrug Nanoparticles for Controlled Drug Delivery of Anticancer, Antifibrotic and Antibacterial Mitomycin JF - INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES J2 - INT J MOL SCI VL - 23 PY - 2022 IS - 12 PG - 14 SN - 1661-6596 DO - 10.3390/ijms23126807 UR - https://m2.mtmt.hu/api/publication/32893726 ID - 32893726 LA - English DB - MTMT ER - TY - JOUR AU - Alsharif, Nizar Bilal Saleem AU - Samu, Gergely Ferenc AU - Sáringer, Szilárd AU - Szerlauth, Adél AU - Takács, Dóra AU - Varga, Viktória AU - Dékány, Imre AU - Szilágyi, István TI - Antioxidant Colloids Via Heteroaggregation of Cerium Oxide Nanoparticles and Latex Beads JF - COLLOIDS AND SURFACES B: BIOINTERFACES J2 - COLLOID SURFACE B VL - 216 PY - 2022 PG - 11 SN - 0927-7765 DO - 10.1016/j.colsurfb.2022.112531 UR - https://m2.mtmt.hu/api/publication/32803563 ID - 32803563 LA - English DB - MTMT ER - TY - JOUR AU - Lamch, Łukasz AU - Wilk, Kazimiera A. AU - Dékány, Imre AU - Imre-Deák, Ágota AU - Varga, Viktória AU - Janovák, László TI - Rational Mitomycin Nanocarriers Based on Hydrophobically Functionalized Polyelectrolytes and Poly(lactide-co-glycolide) JF - LANGMUIR J2 - LANGMUIR VL - 38 PY - 2022 IS - 18 SP - 5404 EP - 5417 PG - 14 SN - 0743-7463 DO - 10.1021/acs.langmuir.1c03360 UR - https://m2.mtmt.hu/api/publication/32792927 ID - 32792927 LA - English DB - MTMT ER - TY - JOUR AU - Mérai, László AU - Imre-Deák, Ágota AU - Dékány, Imre AU - Janovák, László TI - Fundamentals and utilization of solid/ liquid phase boundary interactions on functional surfaces JF - ADVANCES IN COLLOID AND INTERFACE SCIENCE J2 - ADV COLLOID INTERFAC VL - 303 PY - 2022 PG - 23 SN - 0001-8686 DO - 10.1016/j.cis.2022.102657 UR - https://m2.mtmt.hu/api/publication/32763928 ID - 32763928 N1 - Cited By :3 Export Date: 6 December 2022 CODEN: ACISB Correspondence Address: Dékány, I.; Department of Physical Chemistry and Materials Science, H-6720, Rerrich Béla tér 1, Hungary; email: i.dekany@chem.u-szeged.hu Chemicals/CAS: water, 7732-18-5; Emulsions; Water Funding details: Hungarian Scientific Research Fund, OTKA, FK 142437, K 132446 Funding details: Magyar Tudományos Akadémia, MTA Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA Funding text 1: The paper was prepared with the professional support of the Doctoral Student Scholarship Program of the Co-operative Doctoral Program of the Ministry of Innovation and Technology financed from the National Research, Development and Innovation Fund. The authors are also very thankful for the financial support from the Hungarian Scientific Research Fund (OTKA) K 132446 and FK 142437 . This paper was also supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences . LA - English DB - MTMT ER - TY - JOUR AU - Dékány, Imre AU - Nagyné László, Krisztina TI - Kolloidkémiai iskolák JF - MAGYAR KÉMIKUSOK LAPJA J2 - MAGY KEM LAP VL - 76 PY - 2021 IS - 7-8 SP - 237 EP - 237 PG - 1 SN - 0025-0163 UR - https://m2.mtmt.hu/api/publication/32585272 ID - 32585272 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Dékány, Imre TI - Adszorpció és stabilitás organikus biner elegyekben JF - MAGYAR KÉMIKUSOK LAPJA J2 - MAGY KEM LAP VL - 76 PY - 2021 IS - 7-8 SP - 230 EP - 236 PG - 7 SN - 0025-0163 UR - https://m2.mtmt.hu/api/publication/32585256 ID - 32585256 N1 - Eredeti közlemény: Magyar Kémikusok Lapja, 51 (9) 357-363 (1996) LA - Hungarian DB - MTMT ER -