School of Mechatronic Engineering, Universiti Malaysia Perlis (UniMAP), Pauh Putra Campus, 02600 Arau, Perlis, Malaysia.
School of Mechatronic Engineering, Universiti Malaysia Perlis (UniMAP), Pauh Putra Campus, 02600 Arau, Perlis, Malaysia; School of Manufacturing Engineering, Universiti Malaysia Perlis (UniMAP), Pauh Putra Campus, 02600 Arau, Perlis, Malaysia.
Int J Biol Macromol. 2020 Jul 15;155:241-248. doi: 10.1016/j.ijbiomac.2020.03.199. Epub 2020 Mar 30.
Cellulose nanowhisker (NWC) was extracted by hydrolysing Pennisetum purpureum (PP) fibres with acid and alkali. They were subjected to different periods of acid hydrolysis; 30, 45, and 60 min. NWC morphology and physicochemical properties were characterised by transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), particle size analyser, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and thermogravimetric analysis. NWC which underwent the longest hydrolysis time, showed the smallest width and length, under TEM. All samples presented a needle-like shape under TEM and AFM; uneven lengths and irregular shapes under FESEM; and a broad range of distribution, with the particle size analyser. All samples exhibited a good crystallinity index (CrI)-72.0 to 74.6%. The highest CrI% corresponded to 60 min of acid hydrolysis. Thermogravimetric analysis showed thermal stability between 310.72 °C and 336.28 °C. Thus, cellulose nanowhisker from PP fibres, have high potential as bio-nanocomposites.
纤维素纳米晶须（NWC）是通过酸解和碱解提自杂交狼尾草（PP）纤维得到的。它们经历了不同时间的酸水解：30、45 和 60 分钟。通过透射电子显微镜（TEM）、场发射扫描电子显微镜（FESEM）、原子力显微镜（AFM）、粒度分析仪、傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）和热重分析（TGA）对 NWC 的形态和物理化学性质进行了表征。在 TEM 下，经过最长水解时间的 NWC 显示出最小的宽度和长度。所有样品在 TEM 和 AFM 下均呈现针状；在 TEM 和 AFM 下呈现出不均匀的长度和不规则的形状；在 FESEM 下呈现出广泛的分布，用粒度分析仪进行测量。所有样品均表现出良好的结晶度指数（CrI）-72.0 至 74.6%。最高的 CrI%对应于 60 分钟的酸水解。热重分析表明，热稳定性在 310.72°C 和 336.28°C 之间。因此，来自 PP 纤维的纤维素纳米晶须具有作为生物纳米复合材料的高潜力。
