By Jan Mewis, Norman J. Wagner
"Colloidal suspensions are encountered in a mess of typical, organic, and industrially appropriate items and techniques. figuring out what impacts the move habit, or rheology, of colloid debris, and the way those suspensions might be manipulated, is necessary for winning formula of goods akin to paint, polymers, meals, and harmaceuticals. This publication is the 1st dedicated to the learn of colloidal rheology in all its elements. With fabric offered in an introductory demeanour, and intricate mathematical derivations saved to a minimal, the reader will achieve a powerful seize of the elemental rules of colloid technology and rheology. starting with simply hydrodynamic results, the contributions of Brownian movement and interparticle forces are lined, earlier than the reader is guided via particular areas of difficulty comparable to thixotropy and shear thickening; targeted sessions of colloid suspensions also are handled. a necessary consultant for educational and commercial researchers, this booklet can be excellent for graduate direction use"-- learn more... 1. creation to colloid technological know-how and rheology -- 2. Hydrodynamic results -- three. Brownian difficult spheres -- four. reliable 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 subject matters
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Aspx. ¨ ¨ 5. A. Einstein, Uber die von der molekularkinetischen Theorie der Warme geforderte ¨ Bewegung von in ruhenden Flussigkeiten suspendierten Teilchen. Ann Phys. 17 (1905), 549–60. 6. M. von Smoluchowski, Zur kinetischen Theory der Brownschen Molekularbewegung und der Suspensionen. Ann Phys. 21 (1906), 756–80. 7. A. Sutherland, A dynamical theory of diffusion for non-electrolytes and the molecular mass of albumin. Phil Mag. 9 (1905), 781–5. ´ e´ moleculaire. ´ 8. J. Perrin, Mouvement brownien et realit Ann Chim Phys.
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. A number of practical issues make observation of the liquid–crystal phase transition difficult in practice [16]. 55. This is not surprising as the hard sphere colloidal crystal is easily disrupted by weak shearing. Experiments, simulations, and theoretical calculations suggest that hard spheres cannot crystallize if the size polydispersity exceeds ∼12% [17].
9. Depletion potential for various polymer concentrations (expressed in terms of the fraction of c*) and polymer molecular weights (expressed in terms of Rg ). The surface layer consists of polymer molecules with contour length L, degree of polymerization Np , segment length l, and surface graft density p . 8, grafted polymer leads to a steep repulsive force with a range comparable to the radius of gyration of the polymer for low graft densities to the chain length for higher graft densities. Note that the strength depends on the quality of the solvent for the polymer: in a good solvent, the brush is swollen in the solvent.