Understanding depletion forces beyond entropy

Details Understanding depletion forces beyond entropy Understanding depletion forces beyond entropy

1999-08-25

arxiv.org/abs/cond-mat/9908350v1

Physics

Condensed Matter

Scientific paper

10.1103/PhysRevLett.83.3960

The effective interaction energy of a colloidal sphere in a suspension containing small amounts of non-ionic polymers and a flat glass surface has been measured and calculated using total internal reflection microscopy (TIRM) and a novel approach within density functional theory (DFT), respectively. Quantitative agreement between experiment and theory demonstrates that the resulting repulsive part of the depletion forces cannot be interpreted entirely in terms of entropic arguments but that particularly at small distances ($\lesssim$ 100 nm) attractive dispersion forces have to be taken into account.

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