Open Structure of Cotton (image) Eindhoven University of Technology Caption At low temperatures the structure of PNIPAAm-cotton is open. Credit Eindhoven University of Technology Usage Restrictions You can use this picture freely. Please mention the source in the caption. 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.