Unipolar Muscle (IMAGE) University of Texas at Dallas Caption In a study posted online Jan. 28 in the journal Science, University of Texas at Dallas researchers and their colleagues describe creating powerful, unipolar electrochemical yarn muscles that contract more when driven faster. This scanning electron microscope image shows a coiled unipolar muscle made from carbon nanotubes and coated with poly(sodium 4-styrenesulfonate). The outer coil diameter is approximately 140 microns, about twice that of a human hair. Credit University of Texas at Dallas Usage Restrictions with credit 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.