11 Flocculation and Dispersion of Colloidal Suspensions by Polymers and Surfactants: Experimental and Modeling Studies P. Somasundaran a , Venkataramana Runkana a,b , and P.C. Kapur b a Langmuir Center for Colloids and Interfaces, Columbia University, New York, 10027, USA b Tata Research Development and Design Centre, 54-B, Hadapsar Industrial Estate, Pune, 411013, India I. Introduction ................................................................ 768 II. Stability of Suspensions in the Presence of Surfactants, Polymers, and their Mixtures ............... 769 A. Effect of Surfactants ........................................... 770 B. Effect of Polymers ............................................... 774 C. Multipolymer Flocculation.................................. 781 D. Mixed Polymer–Surfactant Systems .................. 783 767 © 2005 by Taylor & Francis Group, LLC