TY - JOUR AU - Szekeres, Márta AU - Csákiné Tombácz, Etelka TI - Surface charge characterization of metal oxides by potentiometric acid-base titration, revisited theory and experiment JF - COLLOIDS AND SURFACES A : PHYSICOCHEMICAL AND ENGINEERING ASPECTS J2 - COLLOID SURFACE A VL - 414 PY - 2012 SP - 302 EP - 313 PG - 12 SN - 0927-7757 DO - 10.1016/j.colsurfa.2012.08.027 UR - https://m2.mtmt.hu/api/publication/2340222 ID - 2340222 LA - English DB - MTMT ER - TY - JOUR AU - Mogyorósi, Károly AU - N, Balázs AU - Srankó, Dávid Ferenc AU - Csákiné Tombácz, Etelka AU - Dékány, Imre AU - Oszkó, Albert Zoltán AU - Sipos, Pál Miklós AU - Dombi, András TI - The effect of particle shape on the activity of nanocristalline TiO2 photocatalysts in phenol decomposition. Part.3: The importance of surface quality JF - APPLIED CATALYSIS B-ENVIRONMENTAL J2 - APPL CATAL B-ENVIRON VL - 96 PY - 2010 IS - 3-4 SP - 577 EP - 585 PG - 9 SN - 0926-3373 DO - 10.1016/j.apcatb.2010.03.007 UR - https://m2.mtmt.hu/api/publication/1417419 ID - 1417419 LA - English DB - MTMT ER - TY - JOUR AU - Jedlovszky-Hajdú, Angéla AU - Csákiné Tombácz, Etelka AU - Nyergesné Illés, Erzsébet AU - Bica, D AU - Vékás, L TI - Magnetite nanoparticles stabilized under physiological conditions for biomedical application JF - PROGRESS IN COLLOID AND POLYMER SCIENCE J2 - PROG COLL POL SCI VL - 135 PY - 2008 SP - 29 EP - 37 PG - 9 SN - 0340-255X DO - 10.1007/2882_2008_111 UR - https://m2.mtmt.hu/api/publication/1238029 ID - 1238029 AB - The biomedical application of water based magnetic fluids (MFs) is of great practical importance. Their colloidal stability under physiological conditions (blood pH ∼ 7.2-7.4 and salt concentration ∼0.15 M) and more in high magnetic field gradient is crucial. Magnetite or maghemite nanoparticles are used in general. In the present work, magnetite nanoparticles were stabilized with different compounds (citric acid (CA) and phosphate) and sodium oleate (NaO) as the most used surfactant in the stabilization of MFs. The adsorption and overcharging effect were quantified, and the enhancement in salt tolerance of stabilized systems was studied. Adsorption, electrophoretic mobility and dynamic light scattering (DLS) measurements were performed. The electrolyte tolerance was tested in coagulation kinetic measurements. Above the adsorption saturation, the nanoparticles are stabilized in a way of combined steric and electrostatic effects. The aim was to research these two important effects and demonstrate that none of them alone is enough. The phosphate was not able to stabilize the ferrofluid in spite of our expectation, but the other two additives proved to be effective stabilizing agents. The magnetite was well stabilized by the surface complexation of CA above pH ∼ 5, however, the salt tolerance of citrate stabilized MFs remained much below the concentration of physiological salt solution, and more the dissolution of magnetite nanocrystals was enhanced due to Fe-CA complexation in aqueous medium, which may cause problems in vivo. The oleate double layers were able to stabilize magnetite nanoparticles perfectly at pH ∼ 6 preventing particle aggregation effectively even in physiological salt solution. © 2008 Springer-Verlag. LA - English DB - MTMT ER - TY - JOUR AU - Csákiné Tombácz, Etelka AU - Bica, D AU - Jedlovszky-Hajdú, Angéla AU - Nyergesné Illés, Erzsébet AU - Majzik, Andrea AU - Vékás, L TI - Surfactant double layer stabilized magnetic nanofluids for biomedical application JF - JOURNAL OF PHYSICS-CONDENSED MATTER J2 - J PHYS CONDENS MAT VL - 20 PY - 2008 IS - 20 PG - 6 SN - 0953-8984 DO - 10.1088/0953-8984/20/20/204103 UR - https://m2.mtmt.hu/api/publication/1238027 ID - 1238027 LA - English DB - MTMT ER - TY - JOUR AU - Csákiné Tombácz, Etelka AU - Nyergesné Illés, Erzsébet AU - Majzik, Andrea AU - Jedlovszky-Hajdú, Angéla AU - Abrankó-Rideg, Nóra AU - Szekeres, Márta TI - Ageing in the inorganic nanoworld. Example of magnetite nanoparticles in aqueous medium TS - Example of magnetite nanoparticles in aqueous medium JF - CROATICA CHEMICA ACTA J2 - CROAT CHEM ACTA VL - 80 PY - 2007 IS - 3-4 SP - 503 EP - 515 PG - 13 SN - 0011-1643 UR - https://m2.mtmt.hu/api/publication/1238026 ID - 1238026 LA - English DB - MTMT ER - TY - JOUR AU - Csákiné Tombácz, Etelka AU - Majzik, Andrea AU - Horvát, Zs AU - Nyergesné Illés, Erzsébet TI - Magnetite in aqueous medium: coating its surface and surface coated with it JF - ROMANIAN REPORTS IN PHYSICS J2 - ROM REP PHYS VL - 58 PY - 2006 SP - 281 EP - 286 PG - 6 SN - 1221-1451 UR - https://m2.mtmt.hu/api/publication/1079000 ID - 1079000 LA - English DB - MTMT ER - TY - JOUR AU - Csákiné Tombácz, Etelka AU - Szekeres, Márta TI - Colloidal behavior of aqueous montmorillonite suspensions: the specific role of pH in the presence of indifferent electrolytes JF - APPLIED CLAY SCIENCE J2 - APPL CLAY SCI VL - 27 PY - 2004 SP - 75 EP - 94 PG - 20 SN - 0169-1317 DO - 10.1016/j.clay.2004.01.001 UR - https://m2.mtmt.hu/api/publication/1335887 ID - 1335887 LA - English DB - MTMT ER - TY - JOUR AU - Csákiné Tombácz, Etelka AU - Libor, Z AU - Nyergesné Illés, Erzsébet AU - Majzik, Andrea AU - Klumpp, E TI - The role of reactive surface sites and complexation by humic acids in the interaction of clay mineral and iron oxide particles JF - ORGANIC GEOCHEMISTRY J2 - ORG GEOCHEM VL - 35 PY - 2004 IS - 3 SP - 257 EP - 267 PG - 11 SN - 0146-6380 DO - 10.1016/j.orggeochem.2003.11.002 UR - https://m2.mtmt.hu/api/publication/1078995 ID - 1078995 N1 - Megjegyzés-22676365 Megjegyzés-22254734 Z9: 83 WC: Geochemistry & Geophysics LA - English DB - MTMT ER - TY - JOUR AU - Nyergesné Illés, Erzsébet AU - Csákiné Tombácz, Etelka TI - The role of variable surface charge and surface complexation in the adsorption of humic acid on magnetite JF - COLLOIDS AND SURFACES A : PHYSICOCHEMICAL AND ENGINEERING ASPECTS J2 - COLLOID SURFACE A VL - 230 PY - 2003 IS - 1-3 SP - 99 EP - 109 PG - 11 SN - 0927-7757 DO - 10.1016/j.colsurfa.2003.09.017 UR - https://m2.mtmt.hu/api/publication/1078996 ID - 1078996 N1 - Megjegyzés-22687641 Megjegyzés-22254735 Z9: 18 WC: Chemistry, Physical Megjegyzés-22334946 MISKOLC, HUNGARY LA - English DB - MTMT ER - TY - JOUR AU - Csákiné Tombácz, Etelka AU - Csanaky, C AU - Nyergesné Illés, Erzsébet TI - Polydisperse fractal aggregate formation in clay mineral and iron oxide suspensions, pH and ionic strength dependence JF - COLLOID AND POLYMER SCIENCE J2 - COLLOID POLYM SCI VL - 279 PY - 2001 IS - 5 SP - 484 EP - 492 PG - 9 SN - 0303-402X DO - 10.1007/s003960100480 UR - https://m2.mtmt.hu/api/publication/1078997 ID - 1078997 LA - English DB - MTMT ER - TY - JOUR AU - Szekeres, Márta AU - Dékány, Imre AU - de Keizer, A TI - Adsorption of dodecyl pyridinium chloride on monodisperse porous silica JF - COLLOIDS AND SURFACES A : PHYSICOCHEMICAL AND ENGINEERING ASPECTS J2 - COLLOID SURFACE A VL - 141 PY - 1998 SP - 327 EP - 336 PG - 10 SN - 0927-7757 DO - 10.1016/S0927-7757(97)00116-7 UR - https://m2.mtmt.hu/api/publication/103837 ID - 103837 LA - English DB - MTMT ER -