TY - JOUR
T1 - Electrokinetic study of adsorption of ionic surfactants on titania from organic solvents
AU - Kosmulski, Marek
AU - Próchniak, Piotr
AU - Rosenholm, Jarl B.
PY - 2009/2
Y1 - 2009/2
N2 - The electrokinetic potential of titania was studied as a function of concentration of SDS, DOSS and CTMABr in a series of solvents. In water and 50-50 water-methanol mixture, which are the most polar studied solvents, the organic ion is adsorbed on titania and the small inorganic ion remains in solution. In hexane the adsorption behavior is reversed, that is, the organic ion remains in solution and the small inorganic ion is adsorbed on titania. The borderline between these two types of behavior corresponds to solvent dielectric constant of about 25. In solvents, which have a dielectric constant in this range (methanol and 1-propanol) the adsorption preferences vary from one surfactant to another. The affinities of the organic ion and of the small inorganic ion to the surface are often similar, and then none of the ionic components is preferentially adsorbed, and the electrokinetic potential is not affected. In such cases, ionic surfactants are not suitable as agents for regulation of zeta potential. © 2009 Elsevier B.V. All rights reserved.
AB - The electrokinetic potential of titania was studied as a function of concentration of SDS, DOSS and CTMABr in a series of solvents. In water and 50-50 water-methanol mixture, which are the most polar studied solvents, the organic ion is adsorbed on titania and the small inorganic ion remains in solution. In hexane the adsorption behavior is reversed, that is, the organic ion remains in solution and the small inorganic ion is adsorbed on titania. The borderline between these two types of behavior corresponds to solvent dielectric constant of about 25. In solvents, which have a dielectric constant in this range (methanol and 1-propanol) the adsorption preferences vary from one surfactant to another. The affinities of the organic ion and of the small inorganic ion to the surface are often similar, and then none of the ionic components is preferentially adsorbed, and the electrokinetic potential is not affected. In such cases, ionic surfactants are not suitable as agents for regulation of zeta potential. © 2009 Elsevier B.V. All rights reserved.
KW - Isoelectric point
KW - Mixed solvent
KW - Organic solvents
KW - Solvent polarity
KW - Zeta potential
UR - https://www.mendeley.com/catalogue/f054e7f5-19d6-3650-90c7-85308cccf29a/
U2 - 10.1016/j.colsurfa.2009.06.033
DO - 10.1016/j.colsurfa.2009.06.033
M3 - Article
SN - 0927-7757
VL - 348
SP - 298
EP - 300
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
IS - 1-3
ER -