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- Title
Observation of polymer conformation hysteresis in extensional flow.
- Authors
Schroeder, Charles M; Babcock, Hazen P; Shaqfeh, Eric S G; Chu, Steven
- Abstract
Highly extensible Escherichia coli DNA molecules in planar extensional flow were visualized in dilute solution by fluorescence microscopy. For a narrow range of flow strengths, the molecules were found in either a coiled or highly extended conformation, depending on the deformation history of the polymer. This conformation hysteresis persists for many polymer relaxation times and is due to conformation-dependent hydrodynamic forces. Polymer conformational free-energy landscapes were calculated from computer simulations and show two free-energy minima for flow strengths near the coil-stretch transition. Hysteresis cycles may directly influence bulk-solution stresses and the development of stress-strain relations for dilute polymer flows.
- Publication
Science (New York, N.Y.), 2003, Vol 301, Issue 5639, p1515
- ISSN
1095-9203
- Publication type
Journal Article
- DOI
10.1126/science.1086070