Entropic Interactions in Suspensions of Semi-Flexible Rods: Short-Range Effects of Flexibility

Details Entropic Interactions in Suspensions of Semi-Flexible Rods: Short-Range Effects of Flexibility Entropic Interactions in Suspensions of Semi-Flexible Rods: Short-Range Effects of Flexibility

2002-06-25

arxiv.org/abs/cond-mat/0206496v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures, submitted to PRE rapid communications

Scientific paper

10.1103/PhysRevE.66.020401

We compute the entropic interactions between two colloidal spheres immersed in a dilute suspension of semi-flexible rods. Our model treats the semi-flexible rod as a bent rod at fixed angle, set by the rod contour and persistence lengths. The entropic forces arising from this additional rotational degree of freedom are captured quantitatively by the model, and account for observations at short range in a recent experiment. Global fits to the interaction potential data suggest the persistence length of fd-virus is about two to three times smaller than the commonly used value of $2.2 \mu {m}$.

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