Download Colloidal suspension rheology by Jan Mewis, Norman J. Wagner PDF

By Jan Mewis, Norman J. Wagner

"Colloidal suspensions are encountered in a large number of typical, organic, and industrially appropriate items and strategies. knowing what impacts the stream habit, or rheology, of colloid debris, and the way those suspensions could be manipulated, is necessary for winning formula of goods resembling paint, polymers, meals, and harmaceuticals. This ebook is the 1st dedicated to the research of colloidal rheology in all its facets. With fabric provided in an introductory demeanour, and intricate mathematical derivations saved to a minimal, the reader will achieve a robust grab of the elemental rules of colloid technology and rheology. starting with simply hydrodynamic results, the contributions of Brownian movement and interparticle forces are coated, sooner than the reader is guided via particular troublesome areas equivalent to thixotropy and shear thickening; specified sessions of colloid suspensions also are handled. a necessary advisor for tutorial and commercial researchers, this ebook can also be excellent for graduate path use"-- learn more... 1. advent to colloid technology and rheology -- 2. Hydrodynamic results -- three. Brownian tough spheres -- four. strong 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. complicated issues

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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. 74. These limits will be particularly relevant when discussing the rheology of Brownian hard sphere dispersions in Chapter 3.

19) [-] stability ratio for rapid Brownian flocculation [-] peak displacement in oscillatory flow [m] valence of ion of type i [-] Greek symbols max ␴p ␶ agg maximum value of the potential barrier [J] graft density of polymer on particle surface [m−2 ] aggregation time, Eq. 21) [s] Subscripts fcc rcp of FCC crystal random close packing Superscripts dep el pol sq ss depletion electrical polymer square well sticky sphere 33 34 Introduction to colloid science and rheology REFERENCES 1. W. B. Russel, D.

The combined curve exhibits, with increasing separation distance, a primary minimum, an electrostatic barrier, and a secondary minimum. Particles that are initially separated experience a long-range attraction. If the secondary minimum is sufficiently deep, the particles will flocculate. This secondary flocculation is reversible, for example by shear or sonication. Further approach is hindered by the electrostatic barrier which, if sufficiently high (>10 kB T), will hinder particle aggregation.

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