Download Coagulation and Flocculation, Second Edition by Bohuslav Dobias, Hansjoachim Stechemesser PDF

By Bohuslav Dobias, Hansjoachim Stechemesser

First released in 1993, Coagulation and Flocculation is a realistic reference for the researchers within the box of the stabilization and destabilization of excellent good dispersions. via omitting chapters that remained unchanged from the 1st version, the editors of this moment variation thoroughly replace, rewrite, and extend upon all chapters to mirror a decade of the newest advances in either theoretical and alertness facets of the sphere.

The authors supply increased fabric that comes with dissociation from a superior floor with self sustaining websites; advancements to the Gouy-Chapman version; electric double layer, floor ionization, and floor heterogeneity; skinny liquid movies and modeling of a semi-batch method utilizing microprocesses possibilities; and clay mineral intracrystalline reactions, purposes, and gelation. New chapters conceal homopolymers and their influence on colloid balance, together with by no means sooner than released figures and equations; the steadiness of suspensions within the presence of surfactants, polymers, and combos; and the flocculation and dewatering of fine-particle suspensions, emphasizing floc formation, development, constitution, and applications.

The moment variation of Coagulation and Flocculation successfully captures either the theoretical and alertness elements of the newest advances within the evolving box of strong dispersions, suspensions, and combinations.

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Extra info for Coagulation and Flocculation, Second Edition

Sample text

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. 6. Formally, at sufficiently low values of cA, s becomes negative. This means that low concentrations of A favor the formation of small particles (large interfacial area), while high concentrations favor Ostwald ripening.

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. This casts some doubt on the dominating role generally attributed to polyvalent ions in the neighborhood of highly charged surfaces. III. 4 Schematic drawing of the potential profile between two positively charged plates in an electrolyte solution.

Assume that the cation can directly adsorb to the sites located at x ¼ 0. The positive charge accumulating in the interface modifies the electrical potential w and the ionic concentrations cþ and cÀ in front of the interface. 7). Assume that the cation exchange between the sites and the solution in the immediate neighborhood of the interface (at x = 0) is governed by a Langmuir isotherm. Then, denoting the interfacial concentration of the adsorbed cations by G0þ, we obtain Gþ cþ (0) 0 , ¼Q¼ K þ cþ (0) G^ (77) 50 500 40 400 300 30 − 20 0 200 c 10 c+ 0 100 ϕ 2 c (mol/m−3) j (mV) where G^ is the total interfacial concentration of the sites.

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