Short-range attractions between two colloids in a lipid monolayer

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Abstract
Two mobile cylinders embedded in a lipidmonolayer exhibit two types of short-range attractions, a depletion-induced attraction in the range r<σ L , where σ L is the diameter of a lipid and r is the distance between the surfaces of the two cylinders, and a fluctuation-induced attraction in the range 1<r/σ L <4. Using Monte Carlo methods we have calculated the force between the cylinders for various diameters σ P . Evidence is given that the strength of attraction increases with decreasing curvature of the cylinders.