Issue 122, 2015

A floating self-propelling liquid marble containing aqueous ethanol solutions

Abstract

A liquid marble is a droplet coated with hydrophobic particles. A floating liquid marble is a unique reactor platform for digital microfluidics. The autonomous motion of a liquid marble is of great interest for this application because of the associated chaotic mixing inside the marble. A floating object can move by itself if a gradient of surface tension is generated in the vicinity of the object. This phenomenon is known as the Marangoni solutocapillary effect. We utilized a liquid marble containing a volatile substance such as ethanol to generate the solutocapillary effect. This paper reports a qualitative study on the operation conditions of liquid marbles containing aqueous ethanol solutions in autonomous motion due to the Marangoni solutocapillary effect. We also derive the scaling laws relating the dynamic parameters of the motion to the physical properties of the system such as the effective surface tension of the marble, the viscosity and the density of the supporting liquid, the coefficient of diffusion of the ethanol vapour, the geometrical parameters of the marble, the speed, the trajectory and the lifetime of the autonomous motion. A self-driven liquid marble has the potential to serve as an effective digital microfluidic reactor for biological and biochemical applications.

Graphical abstract: A floating self-propelling liquid marble containing aqueous ethanol solutions

Supplementary files

Article information

Article type
Paper
Submitted
07 Nov 2015
Accepted
17 Nov 2015
First published
18 Nov 2015

RSC Adv., 2015,5, 101006-101012

Author version available

A floating self-propelling liquid marble containing aqueous ethanol solutions

C. H. Ooi, A. van Nguyen, G. M. Evans, O. Gendelman, E. Bormashenko and N. Nguyen, RSC Adv., 2015, 5, 101006 DOI: 10.1039/C5RA23946J

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