Electrokinetic potential of polystyrene particles in polyelectrolyte and polyelectrolyte mixtures solutions

Polymer adsorption and electrokinetic potential of dispersed particles in weak and strong electric fields

“…roughly the same as the surface charge density. Similar results were obtained for other polyelectrolytes adsorbed on the surface of silica and polystyrene [50][51][52].…”

“…Similar behaviour we observed for all investigated particles having adsorbed cationic polymers of different charge density [48][49][50][51][52][53]. Effect of pH on the electrokinetic potential of polyelectrolyte-covered particles is illustrated by Fig.…”

“…We have performed a systematic study on the effect of anionic and cationic polyelectrolytes on the electrokinetic potential of negatively charged polystryrene, silica, bentonite and kaolin particles as a function of the polymer dose, pH, charge density (CD) of the polyelectrolyte, electrolyte concentration [48][49][50][51][52][53]. It should be stressed that our independent adsorption measurements testify that in the PE concentration range described in this section, the whole added polymer is adsorbed by particles, i.e.…”

“…We have shown [50][51][52] that there is a remarkable correlation between the number of (+) charges of polyelectrolytes with different CD that is necessary to add to polystyrene or silica suspension to reach the iep of the particles surface. For example, for SNF FO 4125 (CD=6 %), SNF FO 4400 (CD=35 %) and SNF FO 4800 (CD=80 %) cationic polyelectrolytes, the iep of the PS surface is reached at polymer concentrations 3.2 mg/g, 0.6 mg/g and 0.25 mg/g, respectively, i.e.…”

“…At the same time the amount of adsorbed cationic polyelectrolytes at which the iep of bentonite or kaolin particles is reached represents only a fraction of the surface charge density of these minerals [44,[48][49][50]53]. It means that the conventional approach, according to which the isoelectric point is reached at nearly the compensation of the surface charge by oppositely charged multivalent counter-ions or surfactant-ions, is not valid for adsorption of high molecular polyelectrolytes onto clay minerals surface.…”