Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 27, Issue 10, Pages 3262-3267Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202004792
Keywords
bottle-brush polymers; mesoporous silica; micromotors; microparticles; polyphosphazenes
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Funding
- Linz Institute of Technology, Johannes Kepler University at Linz
- State of Upper Austria [LIT 213760001 DEG-PMO]
- funding agency :sterreichischen Forschungsfcrderungsgesellschaft mbH (FFG) [877148]
- Austrian Federal Ministry for Digital and Economic Affairs
- National Foundation for Research, Technology and Development
- Christian Doppler Research Association
- RERI-uasb, EFRE [RU2-EU-124/100-2010, M00146]
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This study presents a reversible braking system for micromotors that can be controlled by small temperature changes. By using metal catalysts and thermosensitive polymers, the system controls bubble formation rate to regulate deceleration and acceleration for micromotors, providing a versatile and modular platform for external velocity control.
This work reports a reversible braking system for micromotors that can be controlled by small temperature changes (approximate to 5 degrees C). To achieve this, gated-mesoporous organosilica microparticles are internally loaded with metal catalysts (to form the motor) and the exterior (partially) grafted with thermosensitive bottle-brush polyphos-phazenes to form Janus particles. When placed in an aqueous solution of H2O2 (the fuel), rapid forward propulsion of the motors ensues due to decomposition of the fuel. Conformational changes of the polymers at defined temperatures regulate the bubble formation rate and thus act as brakes with considerable deceleration/acceleration observed. As the components can be easily varied, this represents a versatile, modular platform for the exogenous velocity control of micromotors.
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