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Updated: Aug 8, 2026

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
Published on: May 10, 2022
Direct measurement of entropic forces induced by rigid rods
L Helden1, R Roth, G H Koenderink
1Physics Department, University of Konstanz, D-78457 Konstanz, Germany.
Abstract:
We present the first direct depletion potential measurements for a single colloidal sphere close to a wall in a suspension of rigid colloidal rods. Since all particle interactions are as good as hard-core-like, the depletion potentials are of entirely entropic origin. We developed a density functional theory approach that accurately accounts for this experimental situation. The depletion potentials calculated for different rod number densities are in very good quantitative agreement with the experimental results.
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