Virtual Pillar Schematic (IMAGE) Duke University Caption A graphical representation of the sound wave forces at work that create “virtual pillars” to gently separate and sort nanoparticles from biofluids. Credit Jinxin Zhang, Duke University Usage Restrictions None License Original 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.