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 sturdy dispersions. by way of omitting chapters that remained unchanged from the 1st version, the editors of this moment version thoroughly replace, rewrite, and extend upon all chapters to mirror a decade of the most recent advances in either theoretical and alertness points of the sector. The authors supply elevated 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 procedure utilizing microprocesses percentages; and clay mineral intracrystalline reactions, functions, and gelation. New chapters conceal homopolymers and their influence 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, development, constitution, and applications.The moment version of Coagulation and Flocculation successfully captures either the theoretical and alertness facets of the most recent advances within the evolving box of sturdy dispersions, suspensions, and combinations.
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Extra resources for Coagulation and Flocculation, Second Edition (Surfactant Science)
Therefore the interfacial pressure of coexisting phases must satisfy the condition ð 0 ð B0 1 B À1 Q dp ¼ 0, dm ¼ G^ B00 B00 © 2005 by Taylor & Francis Group, LLC Coagulation and Flocculation 23 where integration is along the isotherm. 3c must be equal. 3d shows p versus ln c/K isotherms calculated from Equations (54a) and (46a) (with Q used as an auxiliary variable). Note that in the case b ¼ À 8 there is a phase change at the intersection between the flat and the steep branch of the curve. According to Equations (50b) and (51) these two branches are thermodynamically stable while the gusset contains unstable states.
B) Q versus ln(c/K ) isotherms (Hill–de Boer). In both part figures a and b, the phase change line separates equal areas labeled þ and À. which should be compared with the values for Temkin adsorption, Equations (49a)–(49c) and (54b). C, the phase transition line must be drawn such that the areas labeled by þ and À become equal. For constant T Equation (55d) gives Àds ¼ dp ¼ RT ð1 À G=G^Þ À 2aG dG: 2 On inserting this in Equation (33) one finds by integration (using partial fraction expansion) c ¼ K(T)ebu u eu=(1Àu) , (1 À u) © 2005 by Taylor & Francis Group, LLC (57a) 26 Thermodynamics of Adsorption from Solution where K is an integration constant, cf.
Equation (72b)). Except for this factor, adsorption of strong electrolytes can be described by the same models as single-component adsorption (see previous chapter). On combining Equations (31), (30), and (71b) the differential heat of adsorption of a strong electrolyte becomes ad 2 @ ln c : (76) Dh ¼ ÀRT 2 @T G © 2005 by Taylor & Francis Group, LLC 34 Thermodynamics of Adsorption from Solution Again, there is an additional factor of 2 if compared with Equation (34). B. Symmetrical Electrolyte: Gouy–Chapman– Stern Theory Consider a plane interface with electrically neutral sites in contact with an ideal solution of a strong (z, À z ) electrolyte.
Coagulation and Flocculation, Second Edition (Surfactant Science) by Bohuslav Dobias, Hansjoachim Stechemesser