Affiliation: | aSchool of Advanced Materials Science and Engineering, Sungkyunkwan University, Kyongki-Do, South Korea;bDepartment of Mechanical Engineering, Yale University, New Haven, CT 06520, USA;cMechanical & Aerospace Engineering Department, UCLA, Los Angeles, CA 90095, USA;dDepartment of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA |