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Investigators at University of the Basque Country Describe Findings in Nanofibers

July 1, 2014



By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Nanofibers. According to news reporting originating in Donostia San Sebastian, Spain, by NewsRx journalists, research stated, "Five pulping methods using different reagents were used for the delignification of almond shells: sodium hydroxide 7.5 % v/v for 24 h at 60 A degrees C, potassium hydroxide 7.5 % v/v for 24 h at 60 A degrees C, formic acid/water 90/10 v/v, organosolv with ethanol/water 60/40 v/v and sodium hydroxide 15 % v/v in an autoclave for 90 min at 120 A degrees C. The resulting cellulose pulps were evaluated using TAPPI standard methods and X-ray diffraction (XRD) to determine the lignin content and crystallinity changes. After pulping, fibers were bleached with sodium chlorite and hydrogen peroxide to obtain pure cellulose."

The news reporters obtained a quote from the research from the University of the Basque Country, "The resulting pulps were characterized by XRD and thermogravimetry to determine the cellulose purification rates and changes in crystallinity. Then, the different pulps were acetylated, hydrolyzed and homogenized to obtain cellulose nanofibers. Nanofiber sizes were assessed by atomic force microscopy and XRD to evaluate the effect of hydrolysis on nanofibers. Finally, nanopaper sheets were produced and the properties were compared to conventional micropaper. The different treatments influenced the amount of lignin eliminated, which had a direct relationship on the subsequent bleaching treatments to obtain pure cellulose."

According to the news reporters, the research concluded: "Hence, the different chemical methods influenced the crystallinity of the fibers which also influenced the yield of cellulose nanofibers and different nanopapers."

For more information on this research see: Nanopaper from almond (Prunus dulcis) shell. Cellulose, 2014;21(3):1619-1629. Cellulose can be contacted at: Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands. (Springer - www.springer.com; Cellulose - www.springerlink.com/content/0969-0239/)

Our news correspondents report that additional information may be obtained by contacting I. Urruzola, University of the Basque Country, Chem & Environm Engn Department, Donostia San Sebastian 20018, Spain. Additional authors for this research include E. Robles, L. Serrano and J. Labidi (see also Nanofibers).

Keywords for this news article include: Spain, Europe, Chemicals, Chemistry, Nanotechnology, Sodium Hydroxide, Emerging Technologies, Donostia San Sebastian

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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