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Apart from such similarities, there are also distinct differences between atoms and colloidal particles. In contrast to pair interactions between atoms, interactions between colloidal particles can be tuned by choosing particle type, temperature, solvent, by supplementing additives such as electrolytes, polymers or colloidal particles, or by modifying the particle surface. Since the 1970s it gradually...
In this chapter we consider the depletion interaction between two flat plates and between two spherical colloidal particles for different depletants (polymers, small colloidal spheres, rods and plates). First of all we focus on the depletion interaction due to a somewhat hypothetical model depletant, the penetrable hard sphere (phs), to mimic a (ideal) polymer molecule.
In this chapter we discuss the basics of the phase behaviour of hard spheres plus depletants. Phase transitions are the result of physical properties of a collection of particles depending on many-body interactions. In Chap. 2 we focused on two-body interactions. As we shall see, depletion effects are commonly not pair-wise additive. Therefore, the prediction of phase transitions of particles with...
When a dispersion containing spherical colloids is mixed with a polymer solution two kinds of instabilities can occur: bridging flocculation (1) caused by adsorbing polymer or unmixing driven by the depletion force (2). The type of instability encountered depends on whether the polymers adsorb onto the colloidal surfaces. Polymer adsorption occurs when the contact between the colloid surface and the...
In the previous chapter we considered the effect of added non-adsorbing polymers on the phase behaviour of suspensions of spherical colloids. The depletion effect is also operational in mixtures of large and small (hard) spheres, where two big spheres in a sea of small spheres are brought together. As the big spheres get close, the smaller spheres can no longer enter the gap between the big ones....
So far we have considered the phase behaviour of colloidal spheres plus depletants. In Chap. 3 we considered the simplest type of depletant, the penetrable hard sphere. We then extended this treatment in Chap. 4 to ideal and excluded volume polymers and in Chap. 5 we considered small colloidal spheres (including micelles) and colloidal rods as depletants. In this chapter we consider the phase...
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