PEC Model (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Illustration of a PEC model system with 20-nanometer gold nanoparticles attached to titanium dioxide. Credit Berkeley Lab Usage Restrictions Credit Berkeley Lab 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.