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 language | English (US) |
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Pages (from-to) | 3600-3603 |
Number of pages | 4 |
Journal | Macromolecules |
Volume | 31 |
Issue number | 11 |
DOIs | |
State | Published - Jun 2 1998 |
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry