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Improving the engine power of a catalytic Janus-sphere micromotor by roughening its surface
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Longbottom, Brooke W. and Bon, Stefan Antonius Franciscus (2018) Improving the engine power of a catalytic Janus-sphere micromotor by roughening its surface. Scientific Reports, 8 (1). 4622. doi:10.1038/s41598-018-22917-2 ISSN 2045-2322.
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Official URL: http://doi.org/10.1038/s41598-018-22917-2
Abstract
Microspheres with catalytic caps have become a popular model system for studying self-propelled colloids. Existing experimental studies involve predominantly "smooth" particle surfaces. In this study we determine the effect of irregular surface deformations on the propulsive mechanism with a particular focus on speed. The particle surfaces of polymer microspheres were deformed prior to depositing a layer of platinum which resulted in the formation of nanoscopic pillars of catalyst. Self-propulsion was induced upon exposure of the micromotors to hydrogen peroxide, whilst they were dispersed in water. The topological surface features were shown to boost speed (~2×) when the underlying deformations are small (nanoscale), whilst large deformations afforded little difference despite a substantial apparent catalytic surface area. Colloids with deformed surfaces were more likely to display a mixture of rotational and translational propulsion than their "smooth" counterparts.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QD Chemistry | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||
SWORD Depositor: | Library Publications Router | ||||||
Library of Congress Subject Headings (LCSH): | Microspheres, Colloids, Catalysts, Platinum | ||||||
Journal or Publication Title: | Scientific Reports | ||||||
Publisher: | Nature Publishing Group | ||||||
ISSN: | 2045-2322 | ||||||
Official Date: | 15 March 2018 | ||||||
Dates: |
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Volume: | 8 | ||||||
Number: | 1 | ||||||
Article Number: | 4622 | ||||||
DOI: | 10.1038/s41598-018-22917-2 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 14 May 2018 | ||||||
Date of first compliant Open Access: | 14 May 2018 |
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