1. Institute of Biomedical Materials and EngineeringCollege of Materials Science and EngineeringLaboratory for New Fiber Materials and Modern Textile, Growing Base for State Key LaboratoryCollege of Chemistry and Chemical EngineeringQingdao University Qingdao 266071 P.R. China
2. Center for Bionanoengineering and Key Laboratory of Biomass, Chemical Engineering of Ministry of EducationCollege of Chemical and Biological EngineeringZhejiang University Hangzhou 310027 P.R. China