Direct measurement of the intermolecular forces confining a single molecule in an entangled polymer solution

Details Direct measurement of the intermolecular forces confining a single molecule in an entangled polymer solution Direct measurement of the intermolecular forces confining a single molecule in an entangled polymer solution

2007-06-25

arxiv.org/abs/0706.3414v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.126001

We use optical tweezers to directly measure the intermolecular forces acting on a single polymer imposed by surrounding entangled polymers (115 kbp DNA, 1 mg/ml). A tube-like confining field was measured in accord with the key assumption of reptation models. A time-dependent harmonic potential opposed transverse displacement, in accord with recent simulation findings. A tube radius of 0.8 microns was determined, close to the predicted value (0.5 microns). Three relaxation modes (~0.4, 5 and 30 s) were measured following transverse displacement, consistent with predicted relaxation mechanisms.

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