By Bohuslav Dobias, Hansjoachim Stechemesser
First released in 1993, Coagulation and Flocculation is a pragmatic reference for the researchers within the box of the stabilization and destabilization of excellent stable dispersions. via omitting chapters that remained unchanged from the 1st variation, the editors of this moment version thoroughly replace, rewrite, and extend upon all chapters to mirror a decade of the newest advances in either theoretical and alertness facets of the sector.
The authors offer multiplied fabric that incorporates dissociation from an effective floor with self sustaining websites; advancements to the Gouy-Chapman version; electric double layer, floor ionization, and floor heterogeneity; skinny liquid motion pictures and modeling of a semi-batch method utilizing microprocesses chances; and clay mineral intracrystalline reactions, purposes, and gelation. New chapters conceal homopolymers and their impact on colloid balance, together with by no means prior to released figures and equations; the soundness of suspensions within the presence of surfactants, polymers, and combos; and the flocculation and dewatering of fine-particle suspensions, emphasizing floc formation, progress, constitution, and applications.
The moment variation of Coagulation and Flocculation successfully captures either the theoretical and alertness features of the most recent advances within the evolving box of reliable dispersions, suspensions, and combinations.
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Extra resources for Coagulation and Flocculation, Second Edition
The upper curves are calculated from the extended local balance model in Ref. , the lower curves from an ordinary Gouy–Chapman– " i is the volume of the hydrated species, ri the correStern model. V sponding radius. Note the increase in energy and ion specificity in the extended model at higher surface charge densities. counterion specificity. Another remarkable result is that at high surface charge densities small counterions displace larger ones from near the surface even if the latter have higher charge.
The following treatment is restricted to uniformly charged particles immersed in ideally diluted electrolyte solutions. After treating the Gouy–Chapman theory of an isolated planar charged surface, we will consider the DLVO theory (named after Derjaguin, Landau, Verwey, and Overbeek) describing, in an approximate manner, the interaction between two identical charged surfaces. The theory incorporates electro-osmotic repulsion (which is due to the ionic cloud between the particles) and van der Waals attraction.
Assume that there is a total concentration G^ of surface sites and that A has a stronger tendency to dissociate from the surface than B. According to Equation (68d) this means that GA is negative. If adsorption of A is described by a Langmuir type isotherm, then GA becomes G A ¼ ÀG^ þ G^ cA K ¼ ÀG^ : cA þ K cA þ K (70a) Obviously, GA goes to zero (with interfacial tension s ¼ s0) when cA becomes very large. On inserting Equation (70a) in the Gibbs adsorption equation (69b), we obtain s ¼ s0 þ RT G^ ln cA : K þ cA (70b) So, this time, the interfacial tension increases with concentration.
Coagulation and Flocculation, Second Edition by Bohuslav Dobias, Hansjoachim Stechemesser