Key Laboratory for Electromagnetic Processing of Materials;
Ministry of Education;
Northeastern University;
Shenyang 110819;
China;
Institute of Metal Research;
Chinese Academy of Sciences;
Shenyang 110016;
China;
School of Materials Science and Engineering;
University of Science and Technology of China;
Hefei 230026;
China;
cornstalk pith; energy absorption; foam; hydration; self-recovery;