1. Elastic turbulence in entangled semi-dilute DNA solutions measured with optical coherence tomography velocimetry

    Elastic turbulence in entangled semi-dilute DNA solutions measured with optical coherence tomography velocimetry

    The flow instabilities of solutions of high molecular weight DNA in the entangled semi-dilute concentration regime were investigated using optical coherence tomography velocimetry, a technique that provides high spatial (probe volumes of 3.4 pL) and temporal resolution (sub μs) information on the flow behaviour of complex fluids in a rheometer. The velocity profiles of the opaque DNA solutions (high and low salt) were measured as a function of the distance across the gap of a parallel plate rheometer, and their evolution over time was measured. At lower DNA concentrations and low shear rates, the velocity fluctuations were well described ...

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