TI Cover Image (image) University of Wisconsin - Milwaukee Caption The study found that the atoms are either stretched apart or pushed together at the grain boundaries and that strain can be used to 'tune' the material's unique electronic properties. Here, the boundaries appear dotted or puckered, while the Bi2Se3 grain forms in a triangular shape. Credit None Usage Restrictions None 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.