VortexRing (IMAGE) Cornell University Caption A microscopic image of doughnut-shaped microparticles, made from silica nanoparticles through vortex ring freezing. This work is detailed in a paper published on Aug. 4 in Nature Communications. Credit Duo An/Cornell University Usage Restrictions Please credit properly 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.