Linear viscoelastic moduli of concentrated DNA solutions

T. G. Mason, A. Dhople, Denis Wirtz

Research output: Contribution to journalArticle

Abstract

We present mechanical measurements of the frequency-dependent linear viscoelastic storage and loss moduli, G′(ω) and G″(ω), for calf thymus DNA (13 kbp) in a saline buffer over a range of mitotically relevant mass concentrations from C = 1 to 10 mg/mL. For C exceeding a critical entanglement concentration, Ce, we observe a dominant plateau elasticity, G′p, for large ω. As ω decreases, G′ falls until it is equal to G″ at the crossover frequency, ωc, below which G″ dominates. These measurements are consistent with a model of entangled semiflexible polymer coils in a good solvent, which predicts G′p ~∼C2.3 and ωc ∼ C-2.4.

Original languageEnglish (US)
Pages (from-to)3600-3603
Number of pages4
JournalMacromolecules
Volume31
Issue number11
StatePublished - Jun 2 1998

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DNA
Thymus
Elasticity
Buffers
Polymers
calf thymus DNA

ASJC Scopus subject areas

  • Materials Chemistry

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Mason, T. G., Dhople, A., & Wirtz, D. (1998). Linear viscoelastic moduli of concentrated DNA solutions. Macromolecules, 31(11), 3600-3603.

Linear viscoelastic moduli of concentrated DNA solutions. / Mason, T. G.; Dhople, A.; Wirtz, Denis.

In: Macromolecules, Vol. 31, No. 11, 02.06.1998, p. 3600-3603.

Research output: Contribution to journalArticle

Mason, TG, Dhople, A & Wirtz, D 1998, 'Linear viscoelastic moduli of concentrated DNA solutions', Macromolecules, vol. 31, no. 11, pp. 3600-3603.
Mason, T. G. ; Dhople, A. ; Wirtz, Denis. / Linear viscoelastic moduli of concentrated DNA solutions. In: Macromolecules. 1998 ; Vol. 31, No. 11. pp. 3600-3603.
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