Influence of Ionic Surfactants and Lecithin on Stability of Titanium Dioxide in Aqueous Electrolyte SolutionReport as inadecuate




Influence of Ionic Surfactants and Lecithin on Stability of Titanium Dioxide in Aqueous Electrolyte Solution - Download this document for free, or read online. Document in PDF available to download.

Croatica Chemica Acta, Vol.80 No.3-4 November 2007. -

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.

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



Author: Emil Chibowski - ; Department of Physical Chemistry-Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Sklodowska Universit

Source: http://hrcak.srce.hr/



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