Mechanical compression to characterize the robustness of liquid marbles

Liu, Zhou; Fu, Xiangyu; Binks, Bernard P.; Shum, Ho Cheung

Abstract

In this work, we have devised a new approach to measure the critical pressure that a liquid marble can withstand. A liquid marble is gradually squeezed under a mechanical compression applied by two parallel plates. It ruptures at a sufficiently large applied pressure. Combining the force measurement and the high-speed imaging, we can determine the critical pressure that ruptures the liquid marble. This critical pressure, which reflects the mechanical robustness of liquid marbles, depends on the type and size of the stabilizing particles as well as the chemical nature of the liquid droplet. By investigating the surface of the liquid marble, we attribute its rupture under the critical pressure to the low surface coverage of particles when highly stretched. Moreover, the applied pressure can be reflected by the inner Laplace pressure of the liquid marble considering the squeezing test is a quasi-static process. By analyzing the Laplace pressure upon rupture of the liquid marble, we predict the dependence of the critical pressure on the size of the liquid marble, which agrees well with experimental results.

Citation

Liu, Z., Fu, X., Binks, B. P., & Shum, H. C. (2015). Mechanical compression to characterize the robustness of liquid marbles. Langmuir : the ACS journal of surfaces and colloids, 31(41), 11236-11242. https://doi.org/10.1021/acs.langmuir.5b02792

• Journal Article Type: Article
• Acceptance Date: Jul 30, 2015
• Online Publication Date: Sep 27, 2015
• Publication Date: Oct 20, 2015
• Deposit Date: Oct 29, 2015
• Publicly Available Date: Nov 23, 2017
• Journal: Langmuir
• Print ISSN: 0743-7463
• Electronic ISSN: 1520-5827
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 31
• Issue: 41
• Pages: 11236-11242
• DOI: https://doi.org/10.1021/acs.langmuir.5b02792
• Keywords: Liquid marble; Mechanical robustness; Liquid interface; Particles
• Public URL: https://hull-repository.worktribe.com/output/380543
• Publisher URL: http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.5b02792
• Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.langmuir.5b02792 .