Rheological properties of viscoelastic drops on superamphiphobic substrates

Harrold, Victoria C.; Paven, Maxime; Vollmer, Doris; Sharp, James S.

Abstract

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.

Citation

Harrold, V. C., Paven, M., Vollmer, D., & Sharp, J. S. (2016). Rheological properties of viscoelastic drops on superamphiphobic substrates. Langmuir, 32(16), 4071-4076. https://doi.org/10.1021/acs.langmuir.6b00779

• Journal Article Type: Article
• Acceptance Date: Apr 1, 2016
• Online Publication Date: Apr 12, 2016
• Publication Date: Apr 1, 2016
• Deposit Date: Jun 30, 2016
• Publicly Available Date: Jun 30, 2016
• Journal: Langmuir
• Print ISSN: 0743-7463
• Electronic ISSN: 1520-5827
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 32
• Issue: 16
• Pages: 4071-4076
• DOI: https://doi.org/10.1021/acs.langmuir.6b00779
• Public URL: https://nottingham-repository.worktribe.com/output/777740
• Publisher URL: http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.6b00779
• 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