Download Colloid Stability: The Role of Surface Forces - Part I, by Tharwat F. Tadros PDF

By Tharwat F. Tadros

The 1st sleek method of relate basic study to the utilized technology of colloids, this sequence bridges educational study and useful purposes, hence supplying the knowledge very important to either. Written via the very most sensible scientists of their respective disciplines, this quantity discusses the character of assorted forces, in addition to the effect of floor forces at the balance of dispersions, their dimension and function in adsorbed polymers and liquid films.
For floor, polymer and physicochemists, fabrics scientists, and chemical engineers.

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Additional info for Colloid Stability: The Role of Surface Forces - Part I, Volume 1

Example text

E. L. Mackor and J. H. van der Waals, J. , 7, 535 (1951). A. Asukara and F. Oosawa, J. Chem. , 22, 1235 (1954); J. Polym. , 93, 183 (1958). G. J. Fleer, J. M. H. M. Scheutjens and B. Vincent, Am. Chem. Soc. Symp. , 240, 245 (1984). 23 2 Thermodynamic Criterion of Spontaneous Dispersion Eugene D. Shchukin and Alexander V. Pertsov Abstract The analysis is presented of the behavior of the function DF ˆ DF…r; r; n†, which describes changes in the free energy of a system due to dispersion of a macrophase at sufficiently low interfacial energy.

Hence the particles will be surrounded by a depletion zone (free of polymer) with thickness D. When the two particles approach each other to a surface–surface separation distance < 2D, the depletion zones of the two particles will overlap. At and above a critical volume fraction of the free polymer }+p, the polymer coils become “squeezed” out from between the particles and hence the osmotic pressure outside the particle surfaces becomes higher than in between them (with a polymer-free zone) and this results in weak flocculation.

In other words, particle collisions arise solely from Brownian diffusion of particles and the diffusion coefficient is given by the Stokes-Einstein relation D = kT/f, where f is the fractional 9 10 1 General Principles of Colloid Stability and the Role of Surface Forces coefficient (as given by Eq. 12). g. shear, ultrasound or centrifugal, or the system is not at thermal equilibrium (so that convection currents arise), then the rate of particle collisions is modified (usually increased) and the flocculation is referred to as orthokinetic.

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