Poisoning of bubble propelled catalytic micromotors : the chemical environment matters
Self-propelled catalytic microjets have attracted considerable attention in recent years and these devices have exhibited the ability to move in complex media. The mechanism of propulsion is via the Pt catalysed decomposition of H2O2 and it is understood that the Pt surface is highly susceptible to...
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sg-ntu-dr.10356-793532023-02-28T19:29:48Z Poisoning of bubble propelled catalytic micromotors : the chemical environment matters Schmidt, Oliver G. Zhao, Guanjia Sanchez, Samuel Pumera, Martin School of Physical and Mathematical Sciences Self-propelled catalytic microjets have attracted considerable attention in recent years and these devices have exhibited the ability to move in complex media. The mechanism of propulsion is via the Pt catalysed decomposition of H2O2 and it is understood that the Pt surface is highly susceptible to poisoning by sulphur-containing molecules. Here, we show that important extracellular thiols as well as basic organic molecules can significantly hamper the motion of catalytic microjet engines. This is due to two different mechanisms: (i) molecules such as dimethyl sulfoxide can quench the hydroxyl radicals produced at Pt surfaces and reduce the amount of oxygen gas generated and (ii) molecules containing –SH, –SSR, and –SCH3 moieties can poison the catalytically active platinum surface, inhibiting the motion of the jet engines. It is essential that the presence of such molecules in the environment be taken into consideration for future design and operation of catalytic microjet engines. We show this effect on catalytic micromotors prepared by both rolled-up and electrodeposition approaches, demonstrating that such poisoning is universal for Pt catalyzed micromotors. We believe that our findings will contribute significantly to this field to develop alternative systems or catalysts for self-propulsion when practical applications in the real environment are considered. Published version 2013-06-04T07:41:03Z 2019-12-06T13:23:14Z 2013-06-04T07:41:03Z 2019-12-06T13:23:14Z 2013 2013 Journal Article Zhao, G., Sanchez, S., Schmidt, O. G., & Pumera, M. (2013). Poisoning of bubble propelled catalytic micromotors: the chemical environment matters. Nanoscale, 5(7), 2909-2914. https://hdl.handle.net/10356/79353 http://hdl.handle.net/10220/10056 10.1039/C3NR34213A 173098 en Nanoscale © 2013 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. application/pdf |
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Self-propelled catalytic microjets have attracted considerable attention in recent years and these devices have exhibited the ability to move in complex media. The mechanism of propulsion is via the Pt catalysed decomposition of H2O2 and it is understood that the Pt surface is highly susceptible to poisoning by sulphur-containing molecules. Here, we show that important extracellular thiols as well as basic organic molecules can significantly hamper the motion of catalytic microjet engines. This is due to two different mechanisms: (i) molecules such as dimethyl sulfoxide can quench the hydroxyl radicals produced at Pt surfaces and reduce the amount of oxygen gas generated and (ii) molecules containing –SH, –SSR, and –SCH3 moieties can poison the catalytically active platinum surface, inhibiting the motion of the jet engines. It is essential that the presence of such molecules in the environment be taken into consideration for future design and operation of catalytic microjet engines. We show this effect on catalytic micromotors prepared by both rolled-up and electrodeposition approaches, demonstrating that such poisoning is universal for Pt catalyzed micromotors. We believe that our findings will contribute significantly to this field to develop alternative systems or catalysts for self-propulsion when practical applications in the real environment are considered. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Schmidt, Oliver G. Zhao, Guanjia Sanchez, Samuel Pumera, Martin |
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Schmidt, Oliver G. Zhao, Guanjia Sanchez, Samuel Pumera, Martin |
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Schmidt, Oliver G. Zhao, Guanjia Sanchez, Samuel Pumera, Martin Poisoning of bubble propelled catalytic micromotors : the chemical environment matters |
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Schmidt, Oliver G. |
title |
Poisoning of bubble propelled catalytic micromotors : the chemical environment matters |
title_short |
Poisoning of bubble propelled catalytic micromotors : the chemical environment matters |
title_full |
Poisoning of bubble propelled catalytic micromotors : the chemical environment matters |
title_fullStr |
Poisoning of bubble propelled catalytic micromotors : the chemical environment matters |
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Poisoning of bubble propelled catalytic micromotors : the chemical environment matters |
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poisoning of bubble propelled catalytic micromotors : the chemical environment matters |
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2013 |
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https://hdl.handle.net/10356/79353 http://hdl.handle.net/10220/10056 |
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