Drop transport and positioning on lubricant-impregnated surfaces

Jian Hui Guan, Élfego Ruiz-Gutiérrez, Ben Bin Xu, David Wood, Glen McHale, Rodrigo Ledesma-Aguilar, Gary George Wells
2017 Soft Matter  
Citation for published item: rui qunD tin nd uizEquti¡ errezD ¡ ilfego nd uD fen fin nd oodD hvid nd wrleD qlen nd vedesmEeguilrD odrigo nd qeorge ellsD qry @PHIUA 9hrop trnsport nd positioning on lurintEimpregnted surfesF9D oft mtterFD IQ @IVAF ppF QRHREQRIHF Further information on publisher's website: httpsXGGdoiForgGIHFIHQWGgUwHHPWHh Publisher's copyright statement: Additional information: Use policy The full-text may be used and/or reproduced, and given to third parties in any format or
more » ... n any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. Please consult the full DRO policy for further details. We demonstrate the transport and positioning of water droplets on macro-patterned lubricantimpregnated surfaces. The macro-patterning produces menisci features in the impregnating liquid layer which interact with a droplet via a capillary mechanism similar to the Cheerios effect. These interactions control the droplet motion and positioning on an otherwise completely slippery surface. We present experimental results using a V-shape channel geometry as a model system. The interaction between deformations on the lubricant layer induced by the droplet and the underlying V-shape geometry leads to both local and global equilibrium positions for the droplet within the channel. We present a mathematical model to quantify the transition from local equilibrium states to the global equilibrium state and show that the latter can be described on the basis of a force balance along the apparent contact line of the droplet. We highlight possible applications where lubricated macro-patterned surfaces can be used to control the motion and localisation of droplets.
doi:10.1039/c7sm00290d pmid:28429011 fatcat:fczpmbmanvcplc3vzhiy7ojnqi