Schematic (IMAGE) Proceedings of the National Academy of Sciences Caption Schematic of the cross section of a solar thermal membrane distillation device under focused illumination. Saline feed and purified distillate flow are on the top and bottom, respectively, of a carbon black-coated PVDF membrane in a countercurrent configuration. The illuminated area is covered with a lens array to concentrate the incident light on the coated membrane surface. Credit Image courtesy of Pratiksha D. Dongare. Usage Restrictions None 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.