Changes in bamboo fiber subjected to different chemical treatments and freeze-drying as measured by nanoindentation

The effects of chemical treatments (H 2 O 2  + CH 3 COOH, acidified NaClO 2 , and NaOH) and freeze-drying on bamboo fibers were studied at a submicron level, to characterize chemical and mechanical changes to the secondary cell wall. Specifically, a field emission environmental scanning electron mic...

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Bibliographic Details
Published in:Journal of wood science 2017-02, Vol.63 (1), p.24-30
Main Authors: Yang, Xi, Shang, Lili, Liu, Xing’e, Yang, Shumin, Tian, Genlin
Format: Article
Language:English
Subjects:
Acidification
Bamboo
Biomedical and Life Sciences
Cellular structure
Characterization and Evaluation of Materials
Chemical treatment
Degradation
Fibers
Field emission microscopy
Fourier transforms
Freeze drying
Hydrogen peroxide
Infrared imaging
Life Sciences
Materials Science
Molecular structure
Morphology
Nanoindentation
Organic chemistry
Original Article
Sodium hydroxide
Wood Science & Technology
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Summary:The effects of chemical treatments (H 2 O 2  + CH 3 COOH, acidified NaClO 2 , and NaOH) and freeze-drying on bamboo fibers were studied at a submicron level, to characterize chemical and mechanical changes to the secondary cell wall. Specifically, a field emission environmental scanning electron microscope (FE-ESEM) and imaging fourier transform infrared spectroscopy (FTIR) were used to demonstrate degradation in morphology and molecular structure, and nanoindentation was used to track changes in micromechanical properties. The results showed that cellular structures after chemical treatments clearly displayed wrinkles, pores, and microfibrils. The decreased bands at 1508 cm -1 and 1426 cm −1 showed that lignin was degraded on treatment of H 2 O 2  + CH 3 COOH and acidified NaClO 2 , which directly resulted in a decrease in hardness ( H ) in the secondary cell wall for treated fibers. In addition, a diminishing peak at 1733 cm −1 caused by NaOH solution indicated that hemicellulose was seriously degraded. It resulted in a decreased modulus ( E r ) by 13.71 % in bamboo fibers, while no obvious reduction was observed in the first two steps.
ISSN:1435-0211
1611-4663
DOI:10.1007/s10086-016-1590-3