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Effect of surface modification as well as type and ionic strength of electrolyte on electrokinetic properties of TiO2 and TiO2-SiO2

Nowacka M., Jesionowski T.

Physicochemical Problems of Mineral Processing

2012

Vol. 48, iss. 1

209-218

Electrokinetic properties of the commercial titanium white (Tytanpol® RS) and precipitated TiO2-SiO2 composite were studied. As they depend mainly on the character of the surface of materials studied, the effect of the amount and type of surface modifying agents on the electrokinetic potential was analysed. The study was performed on the commercial titania and TiO2-SiO2 composite precipitated from an emulsion system, both either unmodified or modified with three organofunctional silanes applied in three different concentrations. The effect of ionic strength of the electrolyte used (KCl, NaNO3 or AlCl3) on the electrokinetic potential of the two systems studied was established. Stability of the dispersive systems studied was evaluated.

Zeta potential and doping in polyaniline dispersions

de Medeiros D. W. O., dos Santos D. S., Dantas T. N. C., Pereir M. R., Giacometti A., Fonseca J. L. C.

Materials Science

2003

Vol. 21, No. 2

251-257

Polyaniline (PAni) has been classified as an intractable polymer, particularly in its conducting form, the emeraldine salt (ES). Therefore one can consider the mixture of water and PAni as a suspension. The conducting form of PAni can be obtained by a doping process known as ,,acid doping'', in which a strong acid turns PAni from its insulating form, the emeraldine base (EB), into the conducting form, the emeraldine salt. With the objective of establishing a correlation between the doping level and the zeta potential of polyaniline dispersions, polyaniline +HCl aqueous suspensions were prepared. Positive zeta potential values for the various suspensions of PAni showed that it acquired positive charges after the doping process. It was also observed an increase in zeta potential values as HCl concentration increased, which could be correlated to UV-Vis spectra of PAni suspensions.