Supramolecular Structure Characterization of Cellulose II Nanowhiskers Produced by Acid Hydrolysis of Cellulose I Substrates

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• 作者：Gilles S猫be ; Fr茅d茅rique Ham-Pichavant ; Emmanuel Ibarboure ; Akissi Lydie Chantal Koffi ; Philippe Tingaut
• 刊名：Biomacromolecules
• 出版年：2012
• 出版时间：February 13, 2012
• 年：2012
• 卷：13
• 期：2
• 页码：570-578
• 全文大小：569K
• 年卷期：v.13,no.2(February 13, 2012)
• ISSN：1526-4602

文摘

Cellulose II nanowhiskers (CNW-II) were produced by treatment of microcrystalline cellulose with sulfuric acid by both controlling the amount of H₂SO₄ introduced and the time of addition during the hydrolysis process. The crystalline structure was confirmed by both XRD and ¹³C CP-MAS NMR spectroscopy. When observed between crossed polarizers, the cellulose II suspension displayed flow birefringence and was stable for several months. The CNW-II nanowhiskers were significantly smaller than the cellulose I nanowhiskers (CNW-I) and had a rounded shape at the tip. The CNW-II average length and height were estimated by AFM to be 153 卤 66 and 4.2 卤 1.5 nm, respectively. An average width of 6.3 卤 1.7 nm was found by TEM, suggesting a ribbon-shape morphology for these whiskers. The average dimensions of the CNW-II elementary crystallites were estimated from the XRD data, using Scherrer鈥檚 equation. A tentative cross-sectional geometry consistent with both XRD and NMR data was then proposed and compared with the geometry of the CNW-I nanowhiskers.