Optical Method (IMAGE) University of Hawaii at Manoa Caption Easy-to-use optical method to quantitatively determine the surface free energy of micro- and nanoparticles. Credit Copyright American Chemical Society Usage Restrictions NOTE copyright 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.