文献类型：期刊文献

英文题名：Effects of ultrasonic treatment during acid hydrolysis on the yield, particle size and structure of cellulose nanocrystals

作者：Guo, Juan[1,2] Guo, Xuxia[1] Wang, Siqun[1,3] Yin, Yafang[1,2]

第一作者：郭娟

通信作者：Yin, YF[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Dept Wood Anat & Utilizat, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry New Technol, Beijing 100091, Peoples R China;[3]Univ Tennessee, Ctr Renewable Carbon, Knoxville, TN 37996 USA

年份：2016

卷号：135

起止页码：248-255

外文期刊名：CARBOHYDRATE POLYMERS

收录：;EI(收录号：20153801278889);Scopus(收录号：2-s2.0-84941352767);WOS:【SCI-EXPANDED(收录号:WOS:000363822500032)】；

基金：The authors would gratefully like to acknowledge the financial support provided from the Fundamental Research Funds for the Central Non-profit Research Institution of Chinese Academy of Forestry (Project No. CAFINT2013C08, Project No. CAFINT2014K03), China. Juan Guo is very grateful to Dr. Gaiyun Li of the Chinese Academy of Forestry for help with the experiments and Mr. Lichao Jiao of the Chinese Academy of Forestry for the data analysis and valuable discussions.

语种：英文

外文关键词：Cellulose nanocrystals; Ultrasonic treatment; Crystal size; Raman spectrum; Fourier transform infrared spectra

摘要：Ultrasonic treatment is useful for the isolation of cellulose nanocrystals (CNCs). However, the effects of ultrasonic treatment on the structure and properties of CNCs have not been fully understood. We statistically analyzed the variations in yields and dimensions of CNCs prepared using acid hydrolysis, with or without ultrasonic treatment, and illustrated these variations by investigating the CNC structures. The results demonstrated that ultrasonic treatment promoted an increase in yields only for short hydrolysis times, while resulting in CNCs with shorter lengths and narrower dimension distributions. Furthermore, a prolonged acid attack under ultrasonic treatment caused a partial dissociation of cellulose hydrogen bond networks in the CNCs, ultimately resulting in the delamination and disorder of the cellulose crystalline structure, thus leading to a decrease in the width and thickness of the CNCs. This work provides more insights into the mechanisms of ultrasonic treatment on the structure and properties of CNCs. (C) 2015 Elsevier Ltd. All rights reserved.