Powerful, Multifunctional Torsional Micromuscles Activated by Phase Transition Liu, Kai ; Cheng, Chun ; Suh, Joonki ; Tang-Kong, Robert ; Fu, Deyi ; Lee, Sangwook ; Zhou, Jian ; Chua, Leon O. ; Wu, Junqiao Abstract Publication: Advanced Materials Pub Date: March 2014 DOI: 10.1002/adma.201304064 Bibcode: 2014AdM....26.1746L