Coagulation and Flocculation, Second Edition (Surfactant by Bohuslav Dobias, Hansjoachim Stechemesser

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. by means of 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 most recent advances in either theoretical and alertness elements of the sphere. The authors supply improved fabric that comes with dissociation from a fantastic 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 procedure utilizing microprocesses chances; and clay mineral intracrystalline reactions, functions, and gelation. New chapters disguise homopolymers and their impact on colloid balance, together with by no means earlier than released figures and equations; the soundness of suspensions within the presence of surfactants, polymers, and combinations; and the flocculation and dewatering of fine-particle suspensions, emphasizing floc formation, progress, constitution, and applications.The moment version of Coagulation and Flocculation successfully captures either the theoretical and alertness points of the most recent advances within the evolving box of sturdy dispersions, suspensions, and combos.

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The Zeta Potential........................................................ 57 References.............................................................................. 68 43 © 2005 by Taylor & Francis Group, LLC 44 I. Surface Charge and Surface Potential INTRODUCTION Surface charges play an important role in translocation and aggregation processes. 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.

A convenient linear representation of the Langmuir isotherm is the G À 1 versus cÀ 1 plot (Lineweaver–Burk plot): G À1 ¼ G^ À1 (1 þ KcÀ1 ) (37c) which is often used to test the agreement between Langmuir isotherm and experimental data and also to determine the parameters G^ and K by linear regression. Assume that G^ is independent of temperature, while the dependence of K is given by K ¼ K0 eA=RT (38a) with constant values of K0 and A. Using Equation (34), one can easily verify A ¼ Dhad : (38b) The chemical potential of the adsorbate, in terms of the intensive variables of the bulk solution, is (cf.

This is just the reverse effect of ordinary onecomponent adsorption. Using Equation (32c) we obtain from Equation (70b) ^ Dgad A ¼ RT G ln cA : K þ cA (70c) so that, this time, DgAad increases with increasing cA (cf. Equations (43a) and (43b)). 6 Surface tension of a solid, s, as a function of ln(cA/c0); calculated from Equation (70b). The slope of the left asymptote is RT G^. V. ADSORPTION FROM ELECTROLYTE SOLUTIONS A. Symmetrical Electrolyte: General Relations Bulk phases are electrically neutral.

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