Condensed Matter > Soft Condensed Matter
[Submitted on 13 May 2016 (v1), last revised 21 Sep 2016 (this version, v2)]
Title:Guiding catalytically active particles with chemically patterned surfaces
View PDFAbstract:Catalytically active Janus particles suspended in solution create gradients in the chemical composition of the solution along their surfaces, as well as along any nearby container walls. The former leads to self-phoresis, while the latter gives rise to chemi-osmosis, providing an additional contribution to self-motility. Chemi-osmosis strongly depends on the molecular interactions between the diffusing chemical species and the wall. We show analytically, using an approximate "point-particle" approach, that by chemically patterning a planar substrate one can direct the motion of Janus particles: the induced chemi-osmotic flows can cause particles to either "dock" at the chemical step between the two materials, or to follow a chemical stripe. These theoretical predictions are confirmed by full numerical calculations. Generically, docking occurs for particles which tend to move away from their catalytic caps, while stripe-following occurs in the opposite case. Our analysis reveals the physical mechanisms governing this behavior.
Submission history
From: William Uspal [view email][v1] Fri, 13 May 2016 16:44:30 UTC (4,140 KB)
[v2] Wed, 21 Sep 2016 12:35:22 UTC (4,252 KB)
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