By Jan Mewis, Norman J. Wagner
Colloidal suspensions are encountered in a mess of normal, organic and industrially appropriate items and methods. realizing what impacts the circulation habit, or rheology, of colloid debris, and the way those suspensions could be manipulated, is critical for profitable formula of goods akin to paint, polymers, meals and prescribed drugs. This e-book is the 1st dedicated to the research of colloidal rheology in all its points. With fabric awarded in an introductory demeanour, and intricate mathematical derivations stored to a minimal, the reader will achieve a robust clutch of the elemental rules of colloid technology and rheology. starting with only hydrodynamic results, the contributions of Brownian movement and interparticle forces are lined, sooner than the reader is guided via particular areas of difficulty, similar to thixotropy and shear thickening; distinctive periods of colloid suspensions also are taken care of. a necessary advisor for tutorial and business researchers, this publication can also be perfect for graduate direction use
''Colloidal suspensions are encountered in a large number of common, organic, and industrially correct items and techniques. knowing what impacts the circulate habit, or rheology, of colloid debris, and the way those suspensions will be manipulated, is necessary for profitable formula of goods akin to paint, polymers, meals, and harmaceuticals. This ebook is the 1st dedicated to the learn 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 powerful snatch of the fundamental ideas of colloid technology and rheology. starting with basically hydrodynamic results, the contributions of Brownian movement and interparticle forces are coated, sooner than the reader is guided via particular areas of difficulty corresponding to thixotropy and shear thickening; designated periods of colloid suspensions also are handled. a vital consultant for educational and business researchers, this ebook can be excellent for graduate direction use''-- Read more... 1. creation to colloid technological know-how and rheology -- 2. Hydrodynamic results -- three. Brownian difficult 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. complex subject matters
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Extra info for Colloidal suspension rheology
The Deborah number, De, can be generally defined as the ratio of a characteristic relaxation time of the fluid (such as ) to a characteristic time of the flow. It thus indicates the relative importance of elastic phenomena. As defined it applies to transient flows; however, it is sometimes applied to steady shear flow by using the shear rate as characteristic time, or to oscillatory flow by using the peak shear rate ␥0 . Other authors characterize the elastic response in steady shear flow by means of the Weissenberg number, Wi, the product of a characteristic time of the fluid and the shear rate.
2 Colloidal stability Driven by Brownian motion, colloidal particles will come into contact at a rate that is governed by diffusion. Von Smoluchowski (1917; see framed story, Chapter 4) first calculated the resulting rate of flocculation, known as rapid Brownian 18 Introduction to colloid science and rheology flocculation, assuming that each binary collision would cause the two particles to stick together: J0 = 8kB T 2 3kB T n = 2 . 18) The rate of doublet formation is dependent on the rate of diffusion and is proportional to the square of the particle volume fraction.
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. Higher values could, for example, be achieved by an increase of the surface charge or a reduction in electrolyte concentration.
Colloidal suspension rheology by Jan Mewis, Norman J. Wagner