Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.048301
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Funding
- NSF [DMR-1006737, DMR-1101900]
- Direct For Mathematical & Physical Scien [1006737] Funding Source: National Science Foundation
- Division Of Materials Research [1006737] Funding Source: National Science Foundation
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We derive a thermodynamic identity that allows one to infer the change in the number of screening ions that are associated with a charged macromolecule as the macromolecule is continuously stretched. Applying this identity to force-extension data on both single-stranded and double-stranded DNA, we find that the number of polymer-associated ions depends nontrivially on both the bulk salt concentration and the bare rigidity of the polymer, with single-stranded DNA exhibiting a relatively large decrease in ion excess upon stretching. We rationalize these observations using simple models for polyelectrolyte extension.
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