Wettability-Independent Droplet Transport by Bendotaxis.

Author: 

Bradley, A
Box, F
Hewitt, I
Vella, D

Publication Date: 

February 2019

Journal: 

Physical review letters

Last Updated: 

2020-05-25T00:52:55.75+01:00

Issue: 

7

Volume: 

122

DOI: 

10.1103/physrevlett.122.074503

page: 

074503-074503

abstract: 

We demonstrate "bendotaxis," a novel mechanism for droplet self-transport at small scales. A combination of bending and capillarity in a thin channel causes a pressure gradient that, in turn, results in the spontaneous movement of a liquid droplet. Surprisingly, the direction of this motion is always the same, regardless of the wettability of the channel. We use a combination of experiments at a macroscopic scale and a simple mathematical model to study this motion, focusing in particular on the timescale associated with the motion. We suggest that bendotaxis may be a useful means of transporting droplets in technological applications, e.g., in developing self-cleaning surfaces, and discuss the implications of our results for such applications.

Symplectic id: 

965679

Submitted to ORA: 

Submitted

Publication Type: 

Journal Article