Influence of Ionic Surfactants and Lecithin on Stability of Titanium Dioxide in Aqueous Electrolyte Solution*
نویسندگان
چکیده
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 it stabilizes TiO2 suspension while at 10 mg dm –3 some destabilizing effects appear relative to the DPPC-free suspension.
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