By Jan Mewis, Norman J. Wagner
Colloidal suspensions are encountered in a mess of average, organic and industrially proper items and procedures. realizing what impacts the move habit, or rheology, of colloid debris, and the way those suspensions might be manipulated, is necessary for profitable formula of goods equivalent to paint, polymers, meals and prescription drugs. This e-book is the 1st dedicated to the research of colloidal rheology in all its features. With fabric offered in an introductory demeanour, and intricate mathematical derivations saved to a minimal, the reader will achieve a powerful snatch of the elemental ideas of colloid technology and rheology. starting with in basic terms hydrodynamic results, the contributions of Brownian movement and interparticle forces are coated, ahead of the reader is guided via particular troublesome areas, similar to thixotropy and shear thickening; specified periods of colloid suspensions also are handled. a necessary advisor for educational and business researchers, this ebook can also be excellent for graduate path use
''Colloidal suspensions are encountered in a large number of ordinary, organic, and industrially proper items and procedures. realizing what impacts the circulation habit, or rheology, of colloid debris, and the way those suspensions may be manipulated, is necessary for winning formula of goods reminiscent of paint, polymers, meals, and harmaceuticals. This e-book is the 1st dedicated to the examine of colloidal rheology in all its features. With fabric awarded in an introductory demeanour, and intricate mathematical derivations saved to a minimal, the reader will achieve a robust snatch of the fundamental rules of colloid technological know-how and rheology. starting with merely hydrodynamic results, the contributions of Brownian movement and interparticle forces are lined, prior to the reader is guided via particular troublesome areas similar to thixotropy and shear thickening; precise periods of colloid suspensions also are taken care of. a necessary advisor for tutorial and business researchers, this booklet can be perfect for graduate path use''-- Read more... 1. creation to colloid technological know-how and rheology -- 2. Hydrodynamic results -- three. Brownian challenging 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 subject matters
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Additional info for Colloidal suspension rheology
Fuchs (1934; see , p. 54) modified the theory to include an interparticle potential, Spielman (1970) and Honig, Roebersen, and Wiersema (1971) included hydrodynamic interactions to yield the exact formula for the rate of Brownian flocculation J. 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.
Each particle with its associated counterions is necessarily electroneutral. Therefore the colloidal interaction due to electrostatics is not simply electrostatic repulsion, as would be the case for charged spheres in a vacuum. In solution, the dominant contribution to the force acting between identical charged particles arises from the excess osmotic repulsion due to the excess number of ions in the surrounding double layer. 6. Specifically, the overlap of the double layers results in an increased ion concentration between the two particles.
As a result the suspension viscosity, as derived from average stresses and shear rates, cannot describe tube flow of suspensions in very small tubes. An extreme example is provided by blood flow. The diameter of the smallest blood vessels is comparable with the diameter of (deformable) red blood cells. This results in various phenomena that cannot be properly described by a pseudo-continuum model. The macroscopic stresses and shear rates obtained from rheological experiments are those associated with the pseudo-continuum.