Individual cotton cellulose nanofibers: pretreatment and fibrillation technique
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We report a method to fibrillate raw dried cotton fibers into individual cellulose nanofibers (CNFs) by chemical purification (removal of non-cellulosic components) and pretreatment by a high-speed blender (breaking down the fiber structures) combined with high-pressure homogenization (nanofibrillation). The resultant CNFs were found to have a width of approximately 10–30 nm and high aspect ratios. The high light transmittance of the CNF/acrylic resin composite indicated that our treatment successfully disintegrated the raw cotton fibers into uniform CNFs. The cotton CNFs were found to have the advantages of high crystallinity and thermal stability.
KeywordsCellulose nanofibers Cotton Nanofibrillation Crystallinity Thermal property
We thank Dr Thi Thu Thao Ho, of the Research Institute for Sustainable Humanosphere, Kyoto University, for her kind help in using a high-pressure homogenizer, and for fruitful discussions on the data analysis. We are also grateful to thank Dr Yoshiki Horikawa, of the Research Institute for Sustainable Humanosphere, Kyoto University, for the staining of the TEM samples. Wenshuai Chen was also partially supported by the Program for New Century Excellent Talents in University (NCET-10-0313), China.
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