Deryagin

Deryagin BV (1973) In Advances in colloid chemistry, Nauka, Moscow, p 30... 

Vor Voropaeva, T.N., Deryagin, B.V., Kabanov, B.N. Dokl. Akad. Nauk SSSR 128 (1959) 981. 

The most developed and widely used approach to electroporation and membrane rupture views pore formation as a result of large nonlinear fluctuations, rather than loss of stability for small (linear) fluctuations. This theory of electroporation has been intensively reviewed [68-70], and we will discuss it only briefly. The approach is similar to the theory of crystal defect formation or to the phenomenology of nucleation in first-order phase transitions. The idea of applying this approach to pore formation in bimolecular free films can be traced back to the work of Deryagin and Gutop [71]. 

The energy of electrostatic repulsion (per pair of particles) which results from zeta-particles is estimated from the Deryagin equation (19) ... 

Some opportunities of such approximations are well illustrated by considering two characteristic examples. The first example will be a dusty-gas model, where porous media is considered as one of components of a gas mix of huge molecules (or particles of a dust), mobile or rigidly fixed in space [249,252,253], Such a model allows a direct application of methods and results of kinetic theory of gases and is effectively applied to the description of mass transfer processes in PS. The history of such an approach, the origins of which can be found in the works by Thomas Graham (1830 to 1840) is considered in Ref. [249], Actually, the model was first proposed by James Maxwell (1860), further it was independently reported by Deryagin and Bakanov (1957), and then also independently reported by Evans, Watson, and Mason (1961 see Refs. [249,252]). 

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. 

Deryagin BV, Levi SM (1959) Physics and chemistry of thin films coating onto moving support. Acad. Sci. Publ., Moscow, p 164... 

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. 

Deryagin, B. M. Levi, S. M. Film Coating Theory, The Focal Press New York, 1964. Domingo, C. Berends, E. Van Rosmalen, G. M. Precipitation of Ultrafine Organic Crystals from the Rapid Expansion of Supercritical Solutions over a Capillary and a Frit Nozzle. J. Supercrit. Fluids, 1997, 10, 35-55. 

The Deryagin-Landau and Verwey-Overbeek theory (introduction)... 

Deryagin and Landau194 and Verwey and Overbeek97 independently developed a quantitative theory in which the stability of lyophobic... 

Attractive forces between macroscopic objects have been measured directly by a number of investigators. In the first experiment of this kind, Deryagin and Abricossova107,202 203 used a sensitive electronic feed-back balance to measure the attraction for a planoconvex polished quartz system from which all residual electric charge had been removed. Relatively large separations were involved and the... 

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

Figure 10.3 Apparatus for measuring the disjoining pressure of free films as a function of their thickness225 (After B.V. Deryagin and A.S. Titijevskaya)...

Figure 10.4 shows the results of some measurements on aqueous sodium oleate films. The sensitivity of the equilibrium film thickness to added electrolyte reflects qualitatively the expected positive contribution of electric double layer repulsion to the disjoining pressure. However, this sensitivity to added electrolyte is much less than that predicted from electric double layer theory and at high electrolyte concentration an equilibrium film thickness of c. 12 nm is attained which is almost independent of the magnitude of the disjoining pressure. To account for this observation, Deryagin and Titijevskaya have postulated the existence of hydration layers... 

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