Original scientific paper

Influence of Ionic Surfactants and Lecithin on Stability of Titanium Dioxide in Aqueous Electrolyte Solution

Emil Chibowski ; Department of Physical Chemistry-Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Sklodowska University, Lublin, Poland
Lucyna Holysz ; Department of Physical Chemistry-Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Sklodowska University, Lublin, Poland
Konrad Terpilowski ; Department of Physical Chemistry-Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Sklodowska University, Lublin, Poland
Agnieszka Ewa Wiacek ; Department of Physical Chemistry-Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Sklodowska University, Lublin, Poland

Abstract

Zeta potential, effective diameter and sedimentation rate of TiO2 (Degussa P-25) suspension
were studied in the presence of NaCl and anionic (sodium dodecyl sulfate, SDS) or cationic
(dodecyltrimethylammonium bromide, DTAB; tetradecyltrimethylammonium bromide, TTAB;
and hexadecyltrimethylammonium bromide, CTAB) surfactant, as well as lecithin (1,2-dipalmitoyl-
sn-glycero-3-phosphocholine, DPPC). In the experiments, the concentration of surfactants
(lecithin) and pH of the solutions were varied. The results obtained show significant influence
of the surfactants on the measured quantities. Depending on the concentration of the
surfactants and pH, they stabilize or destabilize the suspension. The anionic SDS surfactant is
more effective than the cationic ones used in the process of suspension stabilization/destabilization.
At the concentrations used, lecithin (DPPC) affects the parameters only at natural (not
regulated) pH of the suspension. At 5 mg dm–3 it stabilizes TiO2 suspension while at 10 mg dm–3
some destabilizing effects appear relative to the DPPC-free suspension.

Keywords

titanium dioxide; suspension stability; zeta potential; effective diameter; sedimentation rate; surfactants; lecithin

Hrčak ID:

18663

URI

https://hrcak.srce.hr/18663

Publication date:

30.11.2007.

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