Bridging and depletion flocculation of synthetic latices induced by polyelectrolytes

The flocculation and stabilization behaviors of concentrated anionic latex dispersion (5∼15 wt.%) induced by addition of cationic polyelectrolytes (poly- l-lysine; PLL) have been evaluated by rheological measurements. It was found that in the PLL concentration region lower than 0.10 wt.%, the latex...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 1999-08, Vol.153 (1), p.575-581
Main Authors: Furusawa, Kunio, Ueda, Miki, Nashima, Takeshi
Format: Article
Language:English
Subjects:
Bridging flocculation
Depletion effect
Poly- l-lysine
Rheological measurements
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Summary:The flocculation and stabilization behaviors of concentrated anionic latex dispersion (5∼15 wt.%) induced by addition of cationic polyelectrolytes (poly- l-lysine; PLL) have been evaluated by rheological measurements. It was found that in the PLL concentration region lower than 0.10 wt.%, the latex dispersion was flocculated by the bridging effect of the adsorbed PLL layer. In the region of 0.1–0.3 wt.% of PLL, the system was stabilized extensively by the steric effect of the adsorbed layer, and finally it was destabilized again by the depletion effect of free PLL molecules after saturated adsorption, where the surface charge of the particles has been reversed from a negative to a positive sign and compact aggregates have been formed.
ISSN:0927-7757
1873-4359
DOI:10.1016/S0927-7757(98)00479-8