By Jan Mewis, Norman J. Wagner
Colloidal suspensions are encountered in a large number of normal, organic and industrially appropriate items and techniques. figuring out what impacts the circulate habit, or rheology, of colloid debris, and the way those suspensions will be manipulated, is critical for winning formula of goods equivalent to paint, polymers, meals and prescription drugs. This booklet is the 1st dedicated to the learn of colloidal rheology in all its facets. With fabric offered in an introductory demeanour, and complicated mathematical derivations saved to a minimal, the reader will achieve a robust take hold of of the elemental rules of colloid technology and rheology. starting with in simple terms hydrodynamic results, the contributions of Brownian movement and interparticle forces are coated, sooner than the reader is guided via particular areas of difficulty, equivalent to thixotropy and shear thickening; designated periods of colloid suspensions also are taken care of. a vital consultant for tutorial and commercial researchers, this e-book can also be excellent for graduate direction use
''Colloidal suspensions are encountered in a mess of average, organic, and industrially correct items and techniques. knowing what impacts the circulation habit, or rheology, of colloid debris, and the way those suspensions may be manipulated, is critical for profitable formula of goods reminiscent of paint, polymers, meals, and harmaceuticals. This ebook is the 1st dedicated to the research of colloidal rheology in all its features. With fabric awarded in an introductory demeanour, and intricate mathematical derivations stored to a minimal, the reader will achieve a robust grab of the elemental rules of colloid technology 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; targeted sessions of colloid suspensions also are handled. a vital advisor for tutorial and business researchers, this e-book can be excellent for graduate direction use''-- Read more... 1. advent to colloid technology and rheology -- 2. Hydrodynamic results -- three. Brownian not easy 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 issues
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Extra info for Colloidal suspension rheology
This is the case, for example, when a liquid rotates as a rigid body without any flow. This makes the velocity gradient unsuitable for expressing the kinematics in constitutive equations. This inconvenience can be avoided by using the so-called symmetric part of the velocity gradient, which is not affected by rigid-body rotation. The result is the rate-of-strain tensor, D, with components ⎞ ⎛ ∂v y ∂vx 1 ∂vx ∂vz 1 ∂vx + + ⎜ ∂x 2 ∂y ∂x 2 ∂z ∂x ⎟ ⎟ ⎜ ⎟ ⎜ ⎟ ⎜ 1 ∂v y ∂v ∂v ∂v ∂v 1 y y x z ⎟. 14, this changes Eq.
Such an equation expresses the intrinsic relation between the stresses and the kinematics for 20 Introduction to colloid science and rheology a given fluid. It can be combined with the conservation laws for mass, momentum, and energy to solve various flow problems (the Navier-Stokes equations). 14. Therefore the concepts used in Eq. 23) need to be generalized somewhat. In general the velocity is not necessarily oriented along a coordinate line. It must be described by a vector field v (r) in which the velocity v at each position r (x, y, z) has components (vx , vy, vz ) in the coordinate directions.
The innermost layer of ions is adsorbed to the surface and the system is electroneutral, so the rest of the counterions are in solution. The shading denotes the density of these counterions. There are also cations and anions in solution arising from any additional, added electrolytes, such as salt (NaCl) or buffers. , see [1, 2]). The ions in the Stern layer are considered to be immobile and this region acts as a capacitor over which the potential decays linearly. 5 Surface charge (as number of OH− groups per nm2 ) for silica (Ludox) in water, showing the effect of pH and added electrolyte (NaCl, Molar).