Abstract：
:Achieving control over the directionality of active colloids is essential for their use in practical applications such as cargo carriers in microfluidic devices. So far, guidance of spherical Janus colloids was mainly realized using specially engineered magnetic multilayer coatings combined with external magnetic fields. Here we demonstrate that step-like submicrometre topographical features can be used as reliable docking and guiding platforms for chemically active spherical Janus colloids. For various topographic features (stripes, squares or circular posts), docking of the colloid at the feature edge is robust and reliable. Furthermore, the colloids move along the edges for significantly long times, which systematically increase with fuel concentration. The observed phenomenology is qualitatively captured by a simple continuum model of self-diffusiophoresis near confining boundaries, indicating that the chemical activity and associated hydrodynamic interactions with the nearby topography are the main physical ingredients behind the observed behaviour.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Simmchen J,Katuri J,Uspal WE,Popescu MN,Tasinkevych M,Sánchez Sdoi
10.1038/ncomms10598subject
Has Abstractpub_date
2016-02-09 00:00:00pages
10598issn
2041-1723pii
ncomms10598journal_volume
7pub_type
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