Rheological properties of viscoelastic drops on superamphiphobic substrates

Harrold, Victoria C. and Paven, Maxime and Vollmer, Doris and Sharp, James S. (2016) Rheological properties of viscoelastic drops on superamphiphobic substrates. Langmuir, 32 (16). pp. 4071-4076. ISSN 1520-5827

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The rheological properties of microliter sized drops of polymer solutions were investigated using measurements of their mechanical vibrational response. Drops were suspended on superamphiphobic substrates and vibrated by the application of a short mechanical impulse. Surface vibrations were monitored by refracting laser light through the drops and focusing the refracted light onto the surface of a photodiode. Time dependent variations in the photodiode output were Fourier transformed to obtain the frequency and spectral width of the mechanical resonances of the drops. These quantities were related to the frequency dependent shear storage and loss moduli (G′ and G″, respectively) using a simple theoretical model. The resulting rheological properties were found to be in agreement with microrheology measurements of the same solutions. Drop vibration therefore provides a fast and accurate method of quantifying the rheological properties of single drops.

Item Type: Article
Additional Information: This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Langmuir, copyright © American Chemical Society after peer review. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.6b00779
Schools/Departments: University of Nottingham UK Campus > Faculty of Science > School of Physics and Astronomy
Identification Number: https://doi.org/10.1021/acs.langmuir.6b00779
Depositing User: Sharp, James
Date Deposited: 30 Jun 2016 07:22
Last Modified: 17 Sep 2016 06:24
URI: http://eprints.nottingham.ac.uk/id/eprint/34487

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