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Study Data from Kyoto University Update Knowledge of Nanofibers (Preparation of tough cellulose II nanofibers with high thermal stability from wood)

July 1, 2014

By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Nanofibers. According to news reporting out of Kyoto, Japan, by NewsRx editors, research stated, "Well-dispersed cellulose II nanofibers with high purity of 92 % and uniform width of 15-40 nm were isolated from wood and compared to cellulose I nanofibers. First, ground wood powder was purified by series of chemical treatments."

Our news journalists obtained a quote from the research from Kyoto University, "The resulting purified pulp was treated with 17.5 wt% sodium hydroxide (NaOH) solution to mercerize the cellulose. The mercerized pulp was further mechanically nanofibrillated to isolate the nanofibers. X-ray diffraction patterns revealed that the purified pulp had been transformed into the cellulose II crystal structure after treatment with 17.5 wt% NaOH, and the cellulose II polymorph was retained after nanofibrillation. The cellulose II nanofiber sheet exhibited a decrease in Young's modulus (8.6 GPa) and an increase in fracture strain (13.6 %) compared to the values for a cellulose I nanofiber sheet (11.8 GPa and 7.5 %, respectively), which translated into improved toughness."

According to the news editors, the research concluded: "The cellulose II nanofiber sheet also showed a very low thermal expansion coefficient of 15.9 ppm/K in the range of 20-150 A degrees C. Thermogravimetric analysis indicated that the cellulose II nanofiber sheet had better thermal stability than the cellulose I nanofiber sheet, which was likely due to the stronger hydrogen bonds in cellulose II crystal structure, as well as the higher purity of the cellulose II nanofibers."

For more information on this research see: Preparation of tough cellulose II nanofibers with high thermal stability from wood. Cellulose, 2014;21(3):1505-1515. Cellulose can be contacted at: Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands. (Springer -; Cellulose -

Our news journalists report that additional information may be obtained by contacting H.Y. Wang, Kyoto University, Res Inst Sustainable Humanosphere, Uji, Kyoto 6110011, Japan. Additional authors for this research include D.G. Li, H. Yano and K. Abe (see also Nanofibers).

Keywords for this news article include: Asia, Kyoto, Japan, Nanotechnology, Emerging Technologies

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Source: Life Science Weekly

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