Coagulant/flocculant polymers selection

Selective flocculation. Suppose X23 is positive but now the dispersion medium is adjusted to be a worse than 0-solvent for, say, polymer 2 (Xi2>2 but Xi3 < 2)- Homoflocculation of the particles coated by polymer 2 will ensue. Provided that xii is not excessively large, heteroflocculation would be expected to be absent. This implies that it should be possible under such conditions to flocculate selectively one species of sterically stabilized particles in a mixed dispersion. Apparently polymer coated particles are able to discriminate between self and not-selF when undergoing Brownian collisions in such dispersion media, coagulation only occurring between particles of the same type. Of course, if the dispersion medium were made a worse than 0-solvent for both polymers (xi2. Xi3>tX both 2-2 and 3-3 homoflocculation would occur. Heteroflocculation would only be possible if... 

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