Micropost with Defect Ring (image) University of Pennsylvania Caption A submerged micropost causes the surrounding nematic liquid crystal to form a ring defect pattern at the post's mid-height. This ring acts a further template, directing nanoparticles on the surface 50 microns away. Credit PNAS Usage Restrictions None 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.