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Issue 10, 2013
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Measuring material relaxation and creep recovery in a microfluidic device

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Abstract

We present a novel method of testing creep recovery in a microfluidic device. This method allows for the measurement of relaxation time of fluids at low strain. After applying a steady pressure-driven flow along a microchannel, the pressure is released and the fluid is allowed to relax and come to rest. Local strains are observed via the time-dependent velocity profiles and are fit to a general viscoelastic model to obtain the fluids' relaxation times. The use of polymeric solutions of various molecular weights allows for the observation of time scales for strains ranging from 0.01 to 10. Results are consistent with data obtained in a macroscopic rheometer and with a viscoelastic constitutive model.

Graphical abstract: Measuring material relaxation and creep recovery in a microfluidic device

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Publication details

The article was received on 14 Dec 2012, accepted on 28 Feb 2013 and first published on 28 Feb 2013


Article type: Technical Innovation
DOI: 10.1039/C3LC41379A
Citation: Lab Chip, 2013,13, 1850-1853
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    Measuring material relaxation and creep recovery in a microfluidic device

    A. E. Koser, L. Pan, N. C. Keim and P. E. Arratia, Lab Chip, 2013, 13, 1850
    DOI: 10.1039/C3LC41379A

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