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By Jan Mewis, Norman J. Wagner

"Colloidal suspensions are encountered in a large number of ordinary, organic, and industrially suitable items and procedures. knowing what impacts the stream habit, or rheology, of colloid debris, and the way those suspensions may be manipulated, is necessary for profitable formula of goods similar to paint, polymers, meals, and harmaceuticals. This e-book is the 1st dedicated to the research of colloidal rheology in all its elements. With fabric offered in an introductory demeanour, and complicated mathematical derivations saved to a minimal, the reader will achieve a robust grab of the fundamental ideas of colloid technological know-how and rheology. starting with only hydrodynamic results, the contributions of Brownian movement and interparticle forces are coated, earlier than the reader is guided via particular troublesome areas resembling thixotropy and shear thickening; detailed periods of colloid suspensions also are handled. an important advisor for educational and business researchers, this e-book is usually excellent for graduate direction use"-- learn more... 1. creation to colloid technological know-how and rheology -- 2. Hydrodynamic results -- three. Brownian tough spheres -- four. solid colloidal suspensions -- five. Non-spherical debris -- 6. Weakly flocculated suspensions -- 7. Thixotropy -- eight. Shear thickening -- nine. Rheometry of suspensions -- 10. Suspensions in viscoelastic media -- eleven. complex issues

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Colloidal suspension rheology

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1). This excess osmotic pressure acts to push the particles apart until the two double layers are separated. Under the assumptions that the two colloids have the same size and surface potential and that the electrostatic fields surrounding each particle can be linearly added, the following expression for the potential of interaction due to electrostatic interactions in the presence of a symmetric electrolyte of valence z results: el (h) = 32aεεo kT ze 2 tanh2 ␺ s ez 4kB T exp(−␬h). 12) where h = r − 2a is the surface-to-surface distance between the particles.

The critical point occurs at moderate concentrations (∼20%). 13. Illustration of the effect of electrolyte concentration on the phase behavior of charge stabilized colloidal particles. Lowering electrolyte concentration can lead to crystallization, whereas the addition of electrolyte can lead to flocculation and gel formation – both leading to a transition from a fluid state to a solid-like state. separates liquid from gel [19]. Note that attractions also broaden the liquid–crystal phase boundaries [20], where the percolation line tends towards the liquid-solid phase boundary.

In the absence of significant sedimentation this will result in a stable dispersion. 11. This transition is driven by entropy, such that the local entropy gain of colloidal particles in the crystal is greater than the loss of configurational entropy due to crystallization. 17) where n is the number density of colloidal particles. 54, it is fully crystalline. In between is a twophase region of coexistence of fluid and crystal. 58 [15]. 12. , adhesive or “sticky” spheres). the random close packing.

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