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BP: Fachverband Biologische Physik

BP 40: Colloids and Complex Fluids II (Joint Session CPP/BP/DY)

BP 40.6: Vortrag

Mittwoch, 22. März 2017, 12:00–12:15, ZEU 260

Liquid-state theory of the interactions between colloids mediated by attractive reversibly adsorbed polymers. — •A.I. Chervanyov — Institute for Nano- and Microfluidics, TU Darmstadt

By making use of the liquid state theory, we analytically study the effect of attractive polymer-colloid (P-C) and polymer-polymer (P-P) interactions on the effective forces acting between colloids immersed in a polymer system. The performed theoretical analysis has no restrictions with respect to the polymer density and relative sizes of the colloids and polymers. The polymer mediated (PM) potential acting between fillers is shown [1,2] to significantly depend on the strength and range of the P-P and P-C interactions. In the nano-particle limit, where the colloid radius is much smaller than the polymer gyration radius, the presence of attractive P-P interactions causes significant, but only quantitative changes to the PM potential. In the opposite limit of relatively large colloids, the P-P interactions revert the sign of the total effective force acting between colloids so that this force becomes attractive at sufficiently large polymer densities. The effect of the C-P interactions on the PM potential is found to be most pronounced in the case of large polymer densities and small colloid-to-polymer size ratios. The dependence of the second virial coefficient of the effective PM potential on the polymer density is discussed in detail, revealing several novel features of the PM forces caused by the presence of attractive P-P and P-C interactions.

[1] A.I. Chervanyov, Soft Matter 11,1038-1053 (2015).

[2] A.I. Chervanyov, J. Chem. Phys. 141, 244902(2014).