Ghasemi Somayeh, Behrooz Rabi, Ghasemi Ismail
J Nanosci Nanotechnol. 2016 Jun;16(6):5791-7. doi: 10.1166/jnn.2016.12416.
The objective of this study was to extract cellulose nanofibrils (CNFs) from Linter dissolving pulp through a simple and environmentally friendly physical method of refining pretreatment coupled with ultrafine grinder. The morphology, structure and properties of the Linter pulp and obtained NFCs were investigated using Optical Microscopy (OM), electron microscopy (SEM), Atomic Force Microscopy (AFM), Fourier transformed infrared (FTIR) spectra, X-ray diffraction (XRD) and Thermogravimetric (TG) analysis. The OM results indicate that, the Linter Pulp had length and wide mainly ranged 1.3 mm and 13 μm respectively. Based on AFM images, most of extracted nanocellulose had spherical shape and the average of nanocellulose diameter was varied between 30-70 nm when measured by AFM and SEM. Also the FTIR spectra confirmed that the basic structure of nanocellulose was maintained and no derivative was formed. The X-ray results show that by this method of extraction, the crystallinity index of Nanocellulose isolated (62%) decreased in compared to Linter Pulp (79.5%). Also Linter pulp decomposes at higher temperature (280 degrees C) than isolated nanocellulose (240 degrees C).
本研究的目的是通过一种简单且环保的物理方法，即磨浆预处理结合超细研磨机，从棉短绒溶解浆中提取纤维素纳米纤丝（CNFs）。使用光学显微镜（OM）、电子显微镜（SEM）、原子力显微镜（AFM）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和热重分析（TG）对棉短绒浆和所得纳米纤丝纤维素（NFCs）的形态、结构和性能进行了研究。OM结果表明，棉短绒浆的长度和宽度主要分别在1.3毫米和13微米范围内。基于AFM图像，大多数提取的纳米纤维素呈球形，通过AFM和SEM测量时，纳米纤维素的平均直径在30 - 70纳米之间变化。此外，FTIR光谱证实纳米纤维素的基本结构得以保留，未形成衍生物。X射线结果表明，通过这种提取方法，分离出的纳米纤维素的结晶度指数（62%）与棉短绒浆（79.5%）相比有所降低。而且棉短绒浆比分离出的纳米纤维素在更高温度（280摄氏度）下分解（240摄氏度）。
