By a News Reporter-Staff News Editor at Journal of Technology -- Fresh data on Interface Science are presented in a new report. According to news reporting out of Madison, Wisconsin, by VerticalNews editors, research stated, "Research and development of the renewable nanomaterial cellulose nanofibrils (CNFs) has received considerable attention. The effect of drying on the surface energy of CNFs was investigated."
Our news journalists obtained a quote from the research from Forest Service, "Samples of nanofibrillated cellulose (NFC) and cellulose nanocrystals (CNC) were each subjected to four separate drying methods: air-drying, freeze-drying, spray-drying, and supercritical-drying. The surface morphology of the dried CNFs was examined using a scanning electron microscope. The surface energy of the dried CNFs was determined using inverse gas chromatography at infinite dilution and column temperatures: 30, 40, 50, 55, and 60 degrees C. Surface energy measurements of supercritical-dried NFCs were performed also at column temperatures: 70, 75, and 80 degrees C Different drying methods produced CNFs with different morphologies which in turn significantly influenced their surface energy. Supercritical-drying resulted in NFCs having a dispersion component of surface energy of 98.3 +/- 5.8 mJ/m(2) at 30 degrees C The dispersion component of surface energy of freeze-dried NFCs (44.3 +/- 0.4 mJ/m(2) at 30 degrees C) and CNCs (46.5 +/- 0.9 mJ/m(2) at 30 degrees C) were the lowest among all the CNFs. The pre-freezing treatment during the freeze-drying process is hypothesized to have a major impact on the dispersion component of surface energy of the CNFs."
According to the news editors, the research concluded: "The acid and base parameters of all the dried CNFs were amphoteric (acidic and basic) although predominantly basic in nature."
For more information on this research see: Influence of drying method on the surface energy of cellulose nanofibrils determined by inverse gas chromatography. Journal of Colloid and Interface Science, 2013;405():85-95. Journal of Colloid and Interface Science can be contacted at: Academic Press Inc Elsevier Science, 525 B St, Ste 1900, San Diego, CA 92101-4495, USA. (Elsevier - www.elsevier.com; Journal of Colloid and Interface Science - www.elsevier.com/wps/product/cws_home/622861)
Our news journalists report that additional information may be obtained by contacting Y.C. Peng, US Forest Serv, Forest Prod Lab, Dept. of Agriculture, Madison, WI 53726, United States. Additional authors for this research include D.J. Gardner, Y. Han, Z.Y. Cai and M.A. Tshabalala.
Keywords for this news article include: Madison, Wisconsin, United States, Interface Science, North and Central America
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