期刊
CARBOHYDRATE POLYMERS
卷 135, 期 -, 页码 248-255出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.08.068
关键词
Cellulose nanocrystals; Ultrasonic treatment; Crystal size; Raman spectrum; Fourier transform infrared spectra
资金
- Fundamental Research Funds for the Central Non-profit Research Institution of Chinese Academy of Forestry, China [CAFINT2013C08, CAFINT2014K03]
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.
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