文献类型：期刊文献

英文题名：Characterization of the redispersibility of cellulose nanocrystals by particle size analysis using dynamic light scattering

作者：Wu, Guomin[1] Li, Qian[2] Jin, Can[1] Kong, Zhenwu[1] Wang, Siqun[3]

第一作者：吴国民

通信作者：Wu, GM[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing, Jiangsu, Peoples R China;[2]Zhejiang A&F Univ, Sch Engn, Hangzhou, Zhejiang, Peoples R China;[3]Univ Tennessee, Ctr Renewable Carbon, Knoxville, TN USA

年份：2019

卷号：18

期号：4

起止页码：223-231

外文期刊名：TAPPI JOURNAL

收录：;EI(收录号：20201708572293);Scopus(收录号：2-s2.0-85083731117);WOS:【SCI-EXPANDED(收录号:WOS:000466468600002)】；

基金：The authors gratefully acknowledge financial support from the Special Fund for Forest Scientific Research in the Public Welfare (201504603), USDA National Institute of Food and Agriculture (Hatch project 1012359), the Project of National Natural Science Foundation of China (51603189), and Zhejiang Provincial Natural Science Foundation of China (No. LQ14C160004).

语种：英文

外文关键词：Cellulose - Cellulose derivatives - Cellulose nanocrystals - Drying - Dynamic light scattering - High resolution transmission electron microscopy - Hydrolysis - Nanocrystalline powders - Particle size - Powders - Shearing - Sulfuric acid

摘要：Cellulose nanocrystals (CNCs), which are derived from the most abundant and inexhaustible natural polymer, cellulose, have received significant interest owing to their mechanical, optical, chemical, and rheological properties. In order to transport CNC products conveniently and efficiently, they are ideally dried and stored as powders using freeze-drying or spray-drying technologies. The redispersibility of CNC powders is quite important for their end use; hence, a convenient method is required to characterize the redispersibility of CNC powders. In this paper, the possibility of characterizing the redispersibility of CNC powders by particle size analysis using dynamic light scattering (DLS) was investigated by comparing the results from transmission electron microscopy (TEM) and DLS. The particle size obtained with DLS approximately matched that obtained with TEM. Compared with TEM, DLS is a quick and convenient method to measure the particle size distribution of CNCs in water. Two kinds of dispersing methods, sonication and high-speed shearing, and two kinds of CNCs prepared by different methods, sulfuric acid hydrolysis and the TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) oxidization method, were used to study the redispersibility of CNCs. Sonication was more efficient than the high-speed shearing method for nanoscale dispersion of CNC powders in water. CNCs prepared by sulfuric acid hydrolysis could be more easily redispersed in water than those prepared by TEMPO oxidation.