Linear viscoelastic moduli of concentrated DNA solutions

T. G. Mason, A. Dhople, D. 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
DOIs
StatePublished - Jun 2 1998

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ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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