Reinventing the Colander (IMAGE) American Institute of Physics Caption To separate molecules usually a "colander" type of filter is used (Left side). A new type of filter, where the holes of the sieve can be activated is explored. (Right side) Thanks to an external power input, the holes of the sieve (here doors) can be opened and closed. This power input plays the role of a crazy Maxwell Demon -- similar to a bouncer. Credit Sophie Marbach Usage Restrictions This image may be used only with appropriate credit. 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.