Front Cover: Reversible Speed Regulation of Self‐Propelled Janus Micromotors via Thermoresponsive Bottle‐Brush Polymers (Chem. Eur. J. 10/2021)

Abstract

Self‐propelled micromotors with a reversible braking system are shown. Manganese ions are embedded in microporous silica nanoparticles to catalyse the degradation of the H2O2 “fuel” to water and gaseous oxygen. The bubbles formation propels the microparticles in a rapid forward‐thrusting motion. The micromotors are decorated with thermoresponsive polyphosphazenes which expand/collapse in a temperature‐driven response to regulate the flow of fuel to the motor and thus control their velocity. More information can be found in the Communication by I. Teasdale, Y. Salinas, et al. on page 3262.