1. Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, 1038 Dagu Nanlu, Hexi District, Tianjin 300457, P. R. China
2. Research Institute of Wood Industry, Chinese Academy of Forestry, No. 1 Dongxiaofu, Xiangshan Road, Haidian District, Beijing 100091, P. R. China
3. Limerick Pulp and Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
4. Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for NanoScience and Technology, No. 11 Zhongguancun Beiyitiao, Haidian District, Beijing 100190, P. R. China