By Jan Mewis, Norman J. Wagner

ISBN-10: 0511977972

ISBN-13: 9780511977978

ISBN-10: 1139154389

ISBN-13: 9781139154383

ISBN-10: 1139157175

ISBN-13: 9781139157179

ISBN-10: 1139160982

ISBN-13: 9781139160988

"Colloidal suspensions are encountered in a mess of ordinary, organic, and industrially proper items and tactics. realizing what impacts the stream habit, or rheology, of colloid debris, and the way those suspensions could be manipulated, is critical for winning 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 points. With fabric offered in an introductory demeanour, and intricate mathematical derivations saved to a minimal, the reader will achieve a robust take hold of of the elemental ideas of colloid technological know-how and rheology. starting with simply hydrodynamic results, the contributions of Brownian movement and interparticle forces are coated, prior to the reader is guided via particular troublesome areas comparable to thixotropy and shear thickening; exact periods of colloid suspensions also are handled. a vital consultant for educational and commercial researchers, this publication is additionally excellent for graduate direction use"-- learn more... 1. advent to colloid technology and rheology -- 2. Hydrodynamic results -- three. Brownian not easy spheres -- four. sturdy 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 themes

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In a liquid the stress would be very high when a deformation is applied rapidly, because the shear rate would be extremely large. After the rapid deformation stops, there would be no flow anymore and the stress would immediately drop to zero. In a viscoelastic material the stress would gradually decay in time, a phenomenon called stress relaxation. If the viscoelastic material is a solid, the stress would relax only partially and would level off at a finite value. In viscoelastic liquids the stress would relax to zero.

This is often cast in terms of a stability ratio W, defined as J0 = 2a W= J ∞ e /kB T dr. 19) 2a In the above, G(r) is a hydrodynamic function discussed in Chapter 2 that describes the resistance to motion as two particles move towards one another. 3) that provides significant stability by retarding the rate of Brownian flocculation. 25 e max /kB T −1 . 20) Note that W∞ is the rate of rapid Brownian flocculation or aggregation in the absence of any stabilizing forces. 20) shows how the stability ratio can increase substantially above that for rapid Brownian flocculation.

14 is an idealization of the flow in a typical rotational rheometer; in real devices the velocity gradient can vary with position. Rheological test equipment will be discussed in detail in Chapter 9. To generate the flow a force Fxy has to be applied to the upper plate. The first index, x in this case, specifies the direction of the force and the second one, y, defines the plane to which the force is applied, in terms of the normal to the plane. The force required to move the top plate at velocity V is proportional to the surface area of the plates.

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