Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-09-04
Physics
Condensed Matter
Soft Condensed Matter
6 pages, 5 figures; to appear in Europhys. Lett
Scientific paper
10.1209/0295-5075/84/26004
In biomimetic and biological systems, interactions between surfaces are often mediated by adhesive molecules, nanoparticles, or colloids dispersed in the surrounding solution. We present here a general, statistical-mechanical model for two surfaces that interact via adhesive particles. The effective, particle-mediated interaction potential of the surfaces is obtained by integrating over the particles' degrees of freedom in the partition function. Interestingly, the effective adhesion energy of the surfaces exhibits a maximum at intermediate particle concentrations, and is considerably smaller both at low and high concentrations. The effective adhesion energy corresponds to a minimum in the interaction potential at surface separations slightly larger than the particle diameter, while a secondary minimum at surface contact reflects depletion interactions. Our results can be generalized to surfaces with specific receptors for solute particles, and have direct implications for the adhesion of biomembranes and for phase transitions in colloidal systems.
Lipowsky Reinhard
Rozycki Bartosz
Weikl Thomas R.
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