Soft Colloids by J. Lyklema (Eds.)

By J. Lyklema (Eds.)

Quantity V is the counterpart of quantity IV and treats hydrophilic colloids and similar goods. includes edited contributions on steric stabilization, depletion, polyelectrolytes, proteins at interfaces, organization colloids, microemulsions, skinny motion pictures, foams and emulsions. J. Lyklema is coauthor of 2 chapters and basic editor. different authors contain: G.J. Fleer, F.A.M. Leermakers, M.A. Cohen Stuart, W. Norde, J.A.G. Buijs, J.C. Eriksson, T.Sottmann, R. Strey, D. Platikanov, D. Ekserova, V.Bergeron and P.Walstra. * This quantity completes the distinguished sequence basics of Interface and Colloid technological know-how* including quantity IV this e-book offers a accomplished creation to colloid science.* Explains and elaborates phenomena ranging from easy ideas and progresses to extra complex issues

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Example text

De Gennes 1 ' showed that in this case dg/dz -S1°C(^ - ^ ^ &[¥f = ^fiff 24loc( 0, as expected. In order to make progress, we have to know more about the concentration profile cp(z). 15a] for coXoc, only numerical results are possible.

8] for /7 0 S (z), is, apart from the local energy approximation, exact. a > 0 ( y > y*) for depletion, and Oa < 0 ( y < y* ) for adsorption. 4, 5], where the interfacial tension is written as an integral over p- p t , with p the (normal) pressure and p t the tangential pressure in the interfacial region. 4c Ground-state approximation So far all equations are general (within the mean-field approximation), but one needs to solve for the polymer concentration profile before one can apply them. 1].

5] immediately. All the equations given above are valid for adsorption and depletion in semidilute solutions. The difference is that u is positive for adsorption {g > gm > 1), and negative in depletion {g 1 and dg/ dZ < 0 . Let us first consider wide slits (g m = 1), with z = 0 at the (left) surface. 5] reads dZ = dg/(l -g2). Integration gives Z + P = arccothg, where P is an integration constant.

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