Deryagin-Landau theory

In the Deryagin-Landau theory [183], a limiting case is considered in which the region of overlap of the diffuse layers is so small that the deformation of each of the layers may be neglected. Then the formula for the electrical component of disjoining pressure has the form... [Pg.190]

The Deryagin-Landau theory in this case enables us to estimate the electrical component of the disjoining pressure. [Pg.190]

The Deryagin-Landau and Verwey-Overbeek theory (introduction)... [Pg.211]

A number of features of the Deryagin-Landau-Verwey-Overbeek (D.L.V.O.) theory emerge from these expressions ... [Pg.227]

THE DERYAGIN-LANDAU-VERWEY-OVERBEEK (DLVO) THEORY... [Pg.130]

In Deryagin, Landau, and Verwey (DLVO) theory the magnitude of attractive energy is represented by the Hamaker constant A, as shown in Eq. (2). Two like particles in a liquid medium exhibit attraction arising from van der Waals forces. The net Hamaker constant representing the attraction between the two particles in the medium is given by the geometric mean of the two materials in Eq. (4) ... [Pg.210]

The Deryagin-Landau-Verwey-Overbeek (DLVO) Theory... [Pg.244]

The destabilisation of colloidal systems can also be described with the DLVO (Deryagin-Landau-Verwey-Overbeek) theory. This theory has been proposed for lyophobic colloidal systems but can also be applied qualitatively to lyophilic colloidal systems. If the potential energy is plotted as a function of the distance of two particles, a curve is obtained as shown in Fig. 18.8. [Pg.371]

DLVO-theory Deryagin-Landau-Verwey-Overbeek theory... [Pg.891]

When particles approach each other, a result of the attractive van der Waals forces and the repulsive electrostatic forces is the generation of a potential energy barrier which tends to keep particles apart (see Figure 3.2). The Deryagin-Landau and Verwey-Overbeek theory describes the formation of the barrier such that for two spherical particles... [Pg.128]

B. Deryagin and L. D. Landau, A theory of the stability of strongly charged lyophobic sols and the coalescence of strongly charged particles in electrolytic solutions, Collected Papers by L. D. Landau, D. Ter-Haar, ed., Gordon and Breach, New York, 1967. [Pg.57]

Deryagin, B. V., and Landau, L. (1941) Theory of the stability of strongly charged lyophobic sols and of the adhesion of strongly charged particles in solutions of electrolytes. Acta Physi-ochim. U.R.S.S. 14, 633-662. [Pg.703]

Deryagin BV, Landau L. Acta Physicochim URSS 1941 14 633 Verwey EJ, Overbeek JThG. Theory of Stability of Lyophobic colloids. Amsterdam Elsevier 1948. [Pg.592]

Consideration of the electrostatic repulsion and van der Waals forces of attraction by the Russians Deryagin and Landau and the Dutch scientists Verwey and Overbeek produced a satisfactory quantitative approach to the stability of hydrophobic suspensions. Their theory is known as the DLVO theory of colloid stability, the briefest outline of which is given here. [Pg.231]

The first useful theory of colloidal interaction forces and colloid stability (against aggregation) was developed independently by Deryagin and Landau and by Verwey and Overbeek. Hence it is called the DLVO theory. It takes into account the combined effects of van der Waals attraction and electrostatic repulsion. [Pg.459]

Non-grafted boehmite rods experience a much more complicated interaction potential as positive surface electrical charges now play an important role. In this case, the phase diagram has to be discussed in the frame of both the Onsager model of nematic ordering and the DLVO (named after B.V. Deryagin, L. Landau, E.J.W. Verwey, and J.T.G. Overbeek) theory of colloidal stability, which describes colloidal stabihty as a balance between repulsive electrostatic and attractive van der Waals interactions [67,68]. At low ionic strength, electrostatic repulsion dominates so that the phase stability is essentially described by the... [Pg.145]

Independently Deryagin and Landau [1941] and Verwey and Overbeek [1948] developed a theory, usually referred to as the DVLO theory, to explain the complex interactions when electrostatic double layer systems are in contact. On... [Pg.49]

Electrical Double Layer Repulsion. Double layer interaction theory has been extensively investigated independraitly by Deryagin and Landau, and Verwey and Overbeek, DVLO theory. There are many reviews on the application of DVLO theory to colloids [Shaw, 1989]. One expression for the repulsive energy between two small spheres is ... [Pg.183]

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