The Squeezing of Liquid out of a Structured Dispersion

Lee R. White's note (J. Colloid Interface Sci. 95, 286, 1983) reads: "The theoretical derivation of the Derjaguin approximation originally presented was, to say the least, misleading and is still the cause of misunderstanding in the literature." Lee R. White, with a view to "correcting" my derivation and eliminating the misunderstanding arisen, has presented a derivation of the formula [18], suitable for any case of interaction of the surfaces of any curvature with arbitrarily mutually oriented principal axes of the system. However, just the same derivation is contained in my paper published in Kolloidn. Zh. (69, 155, 1934), which has been cited by Lee R. White. The particular case of this formula, i.e., the inversely proportional dependence of the threads adhesion force on the sine of the angle between their axes, was used in a number of works. Thus, it is quite natural that the final formulas expressing the dependence of the surfaces interaction force on the distance and geometry of the surfaces completely coincide with each other. By the way, the same derivation was published in English in the monograph written by B. V. Derjaguin et al. and entitled "Adhesion of Solid Bodies" (Plenum, New York, 1978). Hence, the following conclusion is made: in order to avoid misunderstanding, one should not only cite a paper, but also, at least, take a quick look through it. It is particularly important when the object consists in making a criticism of the article or supplementing it.