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Direct Measurement of the Intermolecular Forces Confining a Single Molecule in an Entangled Polymer Solution by Robertson, Rae M.; Smith, Douglas E. is a scholarly article available to read on EtoBox.

What is Direct Measurement of the Intermolecular Forces Confining a Single Molecule in an Entangled Polymer Solution about?

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.

Author

Robertson, Rae M.; Smith, Douglas E.

Published

2007

Language

EN