Reversible Speed Regulation of Self‐Propelled Janus Micromotors via Thermoresponsive Bottle‐Brush Polymers
| Autor: | Christine Fiedler, Dominik Wielend, Christoph Ulbricht, Yolanda Salinas, Oliver Brüggemann, T. Truglas, Heiko Groiss, Mateusz Bednorz, Ian Teasdale |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
polyphosphazenes
Janus particles 010402 general chemistry 01 natural sciences Catalysis law.invention bottle-brush polymers Acceleration law Janus mesoporous silica chemistry.chemical_classification micromotors microparticles Aqueous solution 010405 organic chemistry Chemistry Communication Organic Chemistry Brush Polymer General Chemistry Mesoporous silica Communications 0104 chemical sciences Chemical engineering Liquid bubble Micromotors | Hot Paper |
| Zdroj: | Chemistry (Weinheim an Der Bergstrasse, Germany) |
| ISSN: | 1521-3765 0947-6539 |
| Popis: | This work reports a reversible braking system for micromotors that can be controlled by small temperature changes (≈5 °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 polyphosphazenes 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. A robust and easily tunable micromotor platform is reported, based on Janus gated‐mesoporous organosilica microparticles with reversible, external responsive braking systems using bottle‐brush polyphosphazenes to control acceleration/deceleration by small changes in temperature. |
| Databáze: | OpenAIRE |
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