Janus Particles (IMAGE) Technische Universität Dresden Caption Janus particles under the electron microscope. The titanium dioxide microswimmers are barely larger than one micrometer. Credit Copyright: Simmchen Group Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.