Abstract
The field of active colloids is attracting significant interest to both enable applications and allow investigations of new collective colloidal phenomena. One convenient active colloidal system that has been much studied is spherical Janus particles, where a hemispherical coating of platinum decomposes hydrogen peroxide to produce rapid motion. However, at present producing these active colloids relies on a physical vapor deposition (PVD) process, which is difficult to scale and requires access to expensive equipment. In this work, it is demonstrated that Pickering emulsion masking combined with solution phase metallization can produce self‐motile catalytic Janus particles. Comparison of the motion and catalytic activity with PVD colloids reveals a higher catalytic activity for a given thickness of platinum due to the particulate nature of the deposited coating. This Pickering emulsion based method will assist in producing active colloids for future applications and aid experimental research into a wide range of active colloid phenomena.
Highlights
Prominent, widely studied examples of synthetic swimming devices include bimetallic rods, consisting of connected cata-Micrometer and nanoscale synthetic swimming devices show lytically active and inactive segments,[8] microrockets, conenhanced displacements far exceeding Brownian motion by sisting of rolled-up microtubes with catalyst coating the interior exploiting localized catalytic reactions
Before solution deposition of platinum was attempted, these amino propyl silane (APS)-modified silica colloids were added to a molten wax in water Pickering emulsion
We have demonstrated a Pickering emulsion route to produce batches of active colloids which exhibit similar motility to those made by physical vapor deposition (PVD)
Summary
Micrometer and nanoscale synthetic swimming devices show lytically active and inactive segments,[8] microrockets, conenhanced displacements far exceeding Brownian motion by sisting of rolled-up microtubes with catalyst coating the interior exploiting localized catalytic reactions Such devices have gen- walls,[9] and Janus particles, consisting of spherical colloids erated interest due to potential applications ranging from where one hemisphere is catalytically active.[10] Platinum is microfluidic transport in lab-on-a-chip devices,[1,2,3] rapid envi- used as the catalytically active material in the majority of the ronmental decontamination,[4] and directed drug delivery.[5] As reported examples due to its ability to perform the rapid roomtemperature decomposition of hydrogen peroxide, and conse-.
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