Mechanical vibrations of magnetically levitatedviscoelastic droplets

Temperton, Robert H.; Hill, Richard J.A.; Sharp, James S.

Abstract

The mechanical vibrations of magnetically levitated droplets were investigated using a simple optical deflection technique. Droplets of water and a water-based solution of poly(acrylamide-co-acrylic acid) were levitated in the bore of a superconducting magnet and perturbed with a short puff of air. Centre of mass and surface vibrations were monitored using laser light refracted through the droplet, focussed on to the end of an optical fiber and detected using a photodiode. Time dependent variations in the voltage generated by the photodiode were Fourier transformed to obtain the frequency and spectral width of the drops' mechanical resonances. A simple theory of drop vibration was developed to extract the rheological properties of the droplets from these quantities. The resulting values of G' and G" that were extracted were found to be in good agreement with values obtained using conventional rheology techniques.

Citation

Temperton, R. H., Hill, R. J., & Sharp, J. S. (2014). Mechanical vibrations of magnetically levitatedviscoelastic droplets. Soft Matter, 10(29), 5375-5379. https://doi.org/10.1039/c4sm00982g

• Journal Article Type: Article
• Acceptance Date: Jun 4, 2014
• Online Publication Date: Jun 4, 2014
• Publication Date: Aug 7, 2014
• Deposit Date: Jun 30, 2016
• Publicly Available Date: Jun 30, 2016
• Journal: Soft Matter
• Print ISSN: 1744-683X
• Electronic ISSN: 1744-6848
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 10
• Issue: 29
• Pages: 5375-5379
• DOI: https://doi.org/10.1039/c4sm00982g
• Public URL: https://nottingham-repository.worktribe.com/output/731117
• Publisher URL: http://pubs.rsc.org/en/Content/ArticleLanding/2014/SM/c4sm00982g#!divAbstract