Flocculation theory

Coagulation and Flocculation Theory and Applications, edited by Bohuslav Dobias... 

Defoaming Theory and Industrial Applications, edited by P. R. Garrett Mixed Surfactant Systems, edited by Keizo Ogino and Masahiko Abe Coagulation and Flocculation Theory and Applications, edited by Bohusiav DobiaD Biosurfactants Production Properties Applications, edited by Naim Kosaric Wettability, edited by John C. Berg... 

The stability of these dispersions has been investigated. A strong dependence of critical flocculation conditions (temperature or volume fraction of added non-solvent) on particle concentration was found. Moreover, there seems to be little or no correlation between the critical flocculation conditions and the corresponding theta-conditions for the stabilising polymer chains, as proposed by Napper. Although a detailed explanation is difficult to give a tentative explanation for this unexpected behaviour is suggested in terms of the weak flocculation theory of Vincent et al. 

Theories of Sonic Flocculation—Theories pertaining to the action of sonic flocculations have been advanced by Andrade (1931-1932a, b), Brandt and Hiedemann (1936), and St. Clair (1938, 1940). Particles in a sound field being caused to vibrate with the gas in which they are suspended set up attractive and repulsive forces, similar to those of two spheres moving together in a fluid. ... 

Lagaly, G., From clay mineral crystals to colloidal clay mineral dispersions, in Coagulation and Flocculation, Theory and Applications, Surfactant Science Series, 47, Dobias, B., Ed., Marcel Dekker, New York, 1993, p. 427. 

The birth and death functions predict the importance of particulate aggr ation on the final particle size distribution. The key concepts for the development of these two functions come from Smoluchowski s rapid flocculation theory, which was derived in Section 6.6.3 ... 

G.J. Fleer and J.M.H.M. Scheutjens, in Coagulation and Flocculation Theory and Applications, B. Dobias, Ed., Surfactant Science ries Vol 47, Marcel Dekker (1993) 209. 

Philipse (5) also assumed that fast hydrolysis created an active monomer bulk. He studied the growth of silica nuclei, already synthesized, after extra addition of different amounts of TES with static light scattering. To explain his growth curves (radius versus time), he used a diffusion-controlled particle growth in a finite bulk of monomers or subparticles. The model contained equations from classical flocculation theories. It takes into account the exhaustion of the monomer bulk and the retarding influence of an (unscreened) electrostatic repulsion between growing spheres and monomers. 

Miihle K. (1993), Floe stability in laminar and turbulent flow, In Coagulation and flocculation theory and... 

Depletion flocculation theories all predict qualitatively the observed dependence of the critical concentration of free polymer required for flocculation on both the molecular weight of the free polymer and the particle radius. All of the observations published to-date point to (i) higher molecular weight free polymer being a more potent flocculant than lower molecular weight species, and (ii) larger particles being more readily flocculated than smaller ones. 

Flocculation has also been observed when the diluent of the dispersion is a good solvent for the chains constituting the steric barrier. This is observed when free polymer, even when it is identical to that constituting the steric barrier, is dissolved in the diluent of the dispersion [3.77]. The magnitude of flocculation is a function of both the molecular mass and the concentration of the added polymer. The depletion flocculation theory suggests that this phenomenon is related primarily to the perturbation of the free polymer chains in solution rather than those in the solvated sheath [3.78]. 

Farrow, J. B. and Warren, L. J. (1993). Measurement of the size of aggregates in suspension. In Coagulation and Flocculation - Theory and Applications, Dobids B. (ed.). Marcel Dekker, New York. 

Hydrodynamic and solvation factors, emulsion stability, microemulsions, multiple emulsions, coagulation and flocculation theory, foam stability, demulsiflcation and defoaming, the effects of adsorbed polymers on stability and flocculation... 

Kohler HH (1993) Surface charge and surface potential. In Coagulation and flocculation Theory and application. Marcel Dekker, Inc., New York, pp. 43-69. 

L.K. Koopal, Adsorption of ions and surfactants, in Coagulation and Flocculation Theory and Applications, ed. by B. Dobias, vol. 47, Surfactant Science Series, (Marcel Detker, New York, 1993), pp. 101-208... 

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