Materials Science and Nano-engineering (MSN) Department, Mohammed VI Polytechnic University (UM6P), Lot 660 - Hay Moulay Rachid, 43150 Benguerir, Morocco; Laboratoire d'Ingénierie et Matériaux (LIMAT), Faculté des Sciences Ben M'sik, Université Hassan II de Casablanca, B.P.7955 Casablanca, Morocco.
National Center for Study and Research on Water and Energy, PO Box 511, Cadi Ayyad University, Marrakech, Av. Abdelkrim El khattabi, 40000, Morocco; Laboratory of Hydrobiology, Ecotoxicology, Sanitation & Global Change (LHEAGC, URAC 33), Semlalia Faculty of Sciences, Marrakech, Morocco.
Int J Biol Macromol. 2019 Feb 15;123:1248-1256. doi: 10.1016/j.ijbiomac.2018.12.030. Epub 2018 Dec 4.
This work investigates the isolation of cellulose nanocrystals (CNC) from sugarcane bagasse (SCB) waste and the evaluation of their mechanical reinforcement capability for k-carrageenan biopolymer. The results from Atomic Force Microscopy and Transmission Electron Microscopy indicated the successful extraction of CNC from SCB following alkali, bleaching and acid hydrolysis treatments. The CNC displayed a needle-like structure with an average aspect ratio of 55. The surface functionality of the CNC was evaluated by Fourier Transform Infrared Spectroscopy and X-ray Photoelectron Spectroscopy measurements. X-ray diffraction studies showed that the as-extracted CNC exhibit cellulose I crystalline structure, with a crystallinity index of 80%. The obtained CNC were dispersed into k-carrageenan biopolymer matrix at various CNC contents (1, 3, 5 and 8 wt%) and the prepared films were further characterized. The incorporation of CNC decreased the light transmittance values but enhanced the mechanical properties compared with the neat k-carrageenan film. Empirical Halpin-Tsai model was used to predict the CNC dispersion within k-carrageenan matrix. The obtained nanocomposite films have the potential to be used as food packaging material.
本工作研究了从甘蔗渣（SCB）废物中分离纤维素纳米晶体（CNC），并评估了其对κ-卡拉胶生物聚合物的机械增强能力。原子力显微镜和透射电子显微镜的结果表明，通过碱处理、漂白和酸水解处理，成功地从 SCB 中提取了 CNC。CNC 呈现出针状结构，平均纵横比为 55。通过傅里叶变换红外光谱和 X 射线光电子能谱测量评估了 CNC 的表面官能团。X 射线衍射研究表明，所提取的 CNC 表现出纤维素 I 结晶结构，结晶度指数为 80%。将获得的 CNC 以不同的 CNC 含量（1、3、5 和 8wt%）分散到 κ-卡拉胶生物聚合物基质中，并对制备的薄膜进行了进一步的表征。与纯 κ-卡拉胶薄膜相比，CNC 的掺入降低了透光率值，但提高了机械性能。经验的 Halpin-Tsai 模型用于预测 CNC 在 κ-卡拉胶基质中的分散情况。所得的纳米复合材料薄膜具有用作食品包装材料的潜力。
