TY - JOUR AU - Abrankó-Rideg, Nóra AU - Horvai, György AU - Jedlovszky, Pál TI - Structure of the adsorption layer of various ionic and non-ionic surfactants at the free water surface, as seen from computer simulation and ITIM analysis JF - JOURNAL OF MOLECULAR LIQUIDS J2 - J MOL LIQ VL - 205 PY - 2015 SP - 9 EP - 15 PG - 7 SN - 0167-7322 DO - 10.1016/j.molliq.2014.05.001 UR - https://m2.mtmt.hu/api/publication/2891756 ID - 2891756 N1 - Laboratory of Interfaces and Nanosize Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány P. Stny 1/A, Budapest, H-1117, Hungary MTA-BME Research Group of Technical Analytical Chemistry, Szt. Gellért tér 4, Budapest, H-1111, Hungary Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, Budapest, H-1111, Hungary EKF Department of Chemistry, Leányka u. 6, Eger, H-3300, Hungary Cited By :8 Export Date: 11 January 2023 CODEN: JMLID Correspondence Address: Jedlovszky, P.; Laboratory of Interfaces and Nanosize Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány P. Stny 1/A, Hungary AB - Molecular dynamics simulations of the adsorption layer of five different surfactant molecules, namely pentanol, octanol, dodecanol, dodecyl trimethyl ammonium chloride, and sodium dodecyl sulphate have been performed at the free surface of water at two different surface densities, namely 1 μmol/m2 (corresponding to unsaturated adsorption layer), and 4 μmol/m2 (corresponding to saturated adsorption layer), on the canonical ensemble at room temperature. The surfactants have been chosen in such a way that the effect of their headgroup charge as well as alkyl tail length on the properties of the adsorption layer can be separately investigated. The results are analysed in terms of the molecular level structure of the adsorption layer; organisation of the different groups and molecules along the macroscopic surface normal axis as well as conformation and orientation of the apolar tail is investigated in detail. In addition, the roughness of the surface of the aqueous phase is also analysed, using the ITIM method for accurately locating the real, capillary wave corrugated surface of the aqueous phase. © 2014 Elsevier B.V. All rights reserved. LA - English DB - MTMT ER - TY - THES AU - Abrankó-Rideg, Nóra TI - Tenzidek folyadék/gáz határfelületen kialakult adszorpciós rétegének vizsgálata számítógépes szimulációval PB - Eötvös Loránd Tudományegyetem (ELTE) PY - 2014 SP - 107 DO - 10.15476/ELTE.2014.126 UR - https://m2.mtmt.hu/api/publication/3372016 ID - 3372016 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Abrankó-Rideg, Nóra AU - Darvas, Mária AU - Horvai, György AU - Jedlovszky, Pál TI - Immersion depth of surfactants at the free water surface: A computer simulation and ITIM analysis study JF - JOURNAL OF PHYSICAL CHEMISTRY B J2 - J PHYS CHEM B VL - 117 PY - 2013 IS - 29 SP - 8733 EP - 8746 PG - 14 SN - 1520-6106 DO - 10.1021/jp401749r UR - https://m2.mtmt.hu/api/publication/2386689 ID - 2386689 N1 - Laboratory of Interfaces and Nanosize Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány P. Stny 1/A, H-1117 Budapest, Hungary SISSA, Department of Biological and Statistical Physics, 265 via Bonomea, I-34136 Trieste, Italy MTA-BME Research Group of Technical Analytical Chemistry, Szt. Gellért tér 4, H-1111 Budapest, Hungary Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary EKF Department of Chemistry, Leányka u. 6, H-3300 Eger, Hungary Cited By :26 Export Date: 19 September 2019 CODEN: JPCBF Correspondence Address: Jedlovszky, P.; Laboratory of Interfaces and Nanosize Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány P. Stny 1/A, H-1117 Budapest, Hungary; email: pali@chem.elte.hu AB - The adsorption layer of five different surfactants, namely, pentanol, octanol, dodecanol, dodecyl trimethyl ammonium chloride, and sodium dodecyl sulfate, has been analyzed on the basis of molecular dynamics simulation results at two surface densities, namely, 1 and 4 μmol/m2. The analyses have primarily focused on the question of how deeply, in terms of atomistic layers, the different surfactant molecules are immersed into the aqueous phase. The orientation and conformation of the surfactant molecules have also been analyzed. The obtained results reveal a clear difference between the immersion behavior of the alcoholic and ionic surfactants. Thus, alcoholic surfactants are found to be located right at the water surface, their apolar tails not being considerably immersed into the aqueous phase and the alcoholic headgroups being preferentially located in the surface layer of water. Ionic surfactants are immersed several layers deep into the aqueous phase, with headgroup atoms reaching the sixth-eighth and tail carbon atoms reaching the third-fourth subsurface layer in several cases. The observed difference is related, on the one hand, to the ability of the alcoholic surfactants of substituting surface water molecules in their lateral hydrogen bonding network at the water surface and that of their apolar tails for replacing dangling hydrogens and, on the other hand, to the energetic gain of the ionic headgroups if they are fully hydrated rather than being in contact with hydrocarbon tail groups. © 2013 American Chemical Society. LA - English DB - MTMT ER - TY - JOUR AU - Abrankó-Rideg, Nóra AU - Darvas, Mária AU - Varga, Imre AU - Jedlovszky, Pál TI - Lateral Dynamics of Surfactants at the Free Water Surface: A Computer Simulation Study JF - LANGMUIR J2 - LANGMUIR VL - 28 PY - 2012 IS - 42 SP - 14944 EP - 14953 PG - 10 SN - 0743-7463 DO - 10.1021/la302998k UR - https://m2.mtmt.hu/api/publication/2172299 ID - 2172299 N1 - Cited By :20 Export Date: 19 September 2019 CODEN: LANGD Correspondence Address: Varga, I.; Laboratory of Interfaces and Nanosize Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány P. Stny 1/A, H-1117 Budapest, Hungary; email: imo@chem.elte.hu Cited By :20 Export Date: 20 September 2019 CODEN: LANGD Correspondence Address: Varga, I.; Laboratory of Interfaces and Nanosize Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány P. Stny 1/A, H-1117 Budapest, Hungary; email: imo@chem.elte.hu AB - Molecular dynamics simulations of the adsorption layer of five different surfactant molecules, i.e., pentyl alcohol, octyl alcohol, dodecyl alcohol, sodium dodecyl sulfate, and dodecyl trimethyl ammonium chloride are performed at the free surface of their aqueous solution at two surface densities, namely 1 and 4 mu mol/m(2) at 298 K. The results are analyzed in terms of the two-dimensional single molecule dynamics, in particular, lateral diffusion of the surfactants at the liquid surface, in order to distinguish between two possible adsorption scenarios, namely the assumptions of localized and mobile surfactants. The obtained results, in accordance with the dynamical nature of the liquid phase and liquid surface, clearly support the latter scenario, as the time scale of lateral diffusion of the surfactant molecules is found to be comparable with that of the three-dimensional diffusion of water in the bulk liquid phase. The mechanism of this lateral diffusion is also investigated in detail by calculating binding energy distribution of the water molecules in the first hydration shell of the surfactant headgroups and that of the nonfirst shell surface waters, and by calculating the mean residence time of the water molecules in the first hydration shell of the surfactant headgroups. This time is found to be at least an order of magnitude smaller than the characteristic time of the lateral diffusion of the surfactants, revealing that surfactant molecules move without their first shell hydration water neighbors at the surface. LA - English DB - MTMT ER - TY - CHAP AU - Abrankó-Rideg, Nóra AU - Varga, Imre ED - Adányiné Kisbocskói, Nóra ED - Wölfling, János TI - A reakciókörülmények hatása a fluoreszcens szilika nanorészecskék tulajdonságaira T2 - MKE 1. Nemzeti Konferencia PB - Magyar Kémikusok Egyesülete (MKE) CY - Budapest SN - 9789639970113 T3 - K-O-14. PY - 2011 UR - https://m2.mtmt.hu/api/publication/2053508 ID - 2053508 LA - Hungarian DB - MTMT ER - TY - CONF AU - Abrankó-Rideg, Nóra AU - Imre, Varga TI - Fluorescent Silica Nanoparticles: Effect of Synthesis Conditions on the Dye Incorporation into the Silica Particles T2 - EuroNanoForum PY - 2011 UR - https://m2.mtmt.hu/api/publication/2053497 ID - 2053497 AB - The investigation of fluorescent nanoscale materials is an emerging research area due to their potential biological and photonic applications. Although every application has its own particular constraint, the fundamental requirements are the same: uniform size, brightness and stability. In order to simultaneously achieve all these criteria in a single fluorescent probe we synthesized core-shell hybrid organic/inorganic nanoparticles from organic dye molecules and silica. Here we report how the dye incorporation into the silica nanoparticles can be maximized by tuning the reaction conditions of the nanoparticle synthesis. Silica nanoparticles were prepared by the Stöber method, which is based on the hydrolyzes and condensation of tetraethylortosilicate (TEOS) in ethanol in the presence of water and ammonia as an alkaline catalyst. To ensure the chemical coupling of the dye molecule to the silica matrix a fluorescent hybrid precursor was prepared by coupling the amine-reactive dye molecule (fluoresceinisothiocyanate) to 3-aminopropyltrialkoxysilane (methoxy and ethoxy). The coupling reaction was performed both in methanol and ethanol solutions. The produced conjugates were identified by HPLC-MS measurements. The nanosilica synthesis was performed using the dye conjugates prepared in the various coupling reactions and their conversion, as well as the formation of the silica nanoparticles were followed during the synthesis. It was found that due to the different hydrolysis rates of the various alkoxy silanes the dye was incorporated in the silica nanoparticles much more efficiently when fluoresceinisothiocyanate-3-aminopropytrimethoxysilane (FITC-APTMS) conjugate was used as dye precursor . We have also investigated the effect of temperature and ammonia concentration on the efficiency of the dye incorporation. It was found that by increasing the amount of the alkaline catalyst the dye incorporation becomes more effective however, it also results in the formation of considerably larger silica particles. In contrast, higher reaction temperatures make the dye incorporation not only more efficient but also give rise to smaller nanoparticle size. LA - English DB - MTMT ER - TY - CONF AU - Abrankó-Rideg, Nóra AU - Gilányi, Tibor AU - I, Varga TI - Optimization of the fluorescent dye incorporation intosilica nanoparticles T2 - XIVth International Symposium on Fluorescence Spectrometry – Recent advances of luminescence techniques in research and modern technology PY - 2010 SP - 147 UR - https://m2.mtmt.hu/api/publication/2053512 ID - 2053512 LA - English DB - MTMT ER - TY - CONF AU - Abrankó-Rideg, Nóra AU - Attila, Pavlath AU - Veronika, Nemeth TI - Pictures of an Exhibition - a possible way to make chemistry more popular T2 - 9th European Conference on Research In Chemical Education PY - 2008 SP - 249 EP - 250 PG - 2 UR - https://m2.mtmt.hu/api/publication/2053520 ID - 2053520 LA - English DB - MTMT ER - TY - JOUR AU - Abrankó-Rideg, Nóra AU - Németh, Veronika TI - Egy kiállítás képei JF - A KÉMIA TANÍTÁSA: MÓDSZERTANI FOLYÓIRAT J2 - A KÉMIA TANÍTÁSA VL - 4 PY - 2007 SP - 17 EP - 19 PG - 3 SN - 1216-7576 UR - https://m2.mtmt.hu/api/publication/2053876 ID - 2053876 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Abrankó-Rideg, Nóra ED - Janáky, Csaba TI - "Egy kiállítás képei" - avagy a kémia népszerűsítésének egy lehetséges módja T2 - XXX. Kémiai Előadói Napok PB - JATEPress CY - Szeged SN - 9789634828457 PY - 2007 UR - https://m2.mtmt.hu/api/publication/2053524 ID - 2053524 LA - Hungarian DB - MTMT ER -