By Stache H.W. (ed.)
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This was suggested by Frens and Overbeek . Under this assumption the coagulation kernel can remain constant or depend on the aggregate size. The Smoluchowski treatment is based on the collision of spheres and this assumption is questionable in the case of aggregates. Except when coalescence occurs, aggregates cannot be truly spherical. 4. The collision rates of such aggregates are likely to differ from those for spheres. 16. As the size of an irregular aggregate increases, it is likely that the increase in collision radius more than compensates for the decrease in diffusion coefficient and the results of Cahill et al.
In these cases, the van der Waals attraction is not sufficiently strong to prevent separation of particles when the salt is diluted and double-layer repulsion is re-established. Another type of hydration repulsion arises when adsorbed layers of hydrophilic material are present, but this is usually considered as a “steric” interaction. In Ref. 31, it is shown that the hydration forces acting between bilayers of different phosphatidylcholines have a comparable magnitude out to a bilayer of about 2–3 nm.
Dashed line indicates the trajectories of the particle at b < bcr and b > bcr . In the area above the equatorial plane, the liquid flow lines approach the surface of the biggest drop, which means that the radial component of the liquid velocity is directed toward the surface of the biggest drop. Because the motion of the particle toward the surface is obstructed within the zone of the SRHI, the radial velocity of the liquid is higher than that of the small drop. Thus, at a small gap thickness where the viscous resistance is high, the radial velocity of the liquid will be even higher.
Anionic surfactants by Stache H.W. (ed.)