Fatigue and Aeronautical Materials Research Group, Department of Materials and Technology, São Paulo State University (Unesp), School of Engineering, Guaratinguetá, 12516-410, São Paulo, Brazil.
Fatigue and Aeronautical Materials Research Group, Department of Materials and Technology, São Paulo State University (Unesp), School of Engineering, Guaratinguetá, 12516-410, São Paulo, Brazil.
Carbohydr Polym. 2018 Jul 15;192:337-346. doi: 10.1016/j.carbpol.2018.03.055. Epub 2018 Mar 19.
Cellulose nanoparticles (CNs) were prepared by acid hydrolysis of the cellulose pulp extracted from the Brazilian satintail (Imperata Brasiliensis) plant using a conventional and a total chlorine free method. Initially, a statistical design of experiment was carried out using Taguchi orthogonal array to study the hydrolysis parameters, and the main properties (crystallinity, thermal stability, morphology, and sizes) of the nanocellulose. X-ray diffraction (XRD), fourier-transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FE-SEM), dynamic light scattering (DLS), zeta potential and thermogravimetric analysis (TGA) were carried out to characterize the physical-chemical properties of the CNs obtained. Cellulose nanoparticles with diameter ranging from 10 to 60 nm and length between 150 and 250 nm were successfully obtained at sulfuric acid concentration of 64% (m/m), temperature 35 °C, reaction time 75 min, and a 1:20 (g/mL) pulp-to-solution ratio. Under this condition, the Imperata Brasiliensis CNs showed good stability in suspension, crystallinity index of 65%, and a cellulose degradation temperature of about 117 °C. Considering that these properties are similar to those of nanocelluloses from other lignocellulosics feedstocks, Imperata grass seems also to be a suitable source for nanocellulose production.
纤维素纳米颗粒（CNs）是通过酸水解从巴西大薊（Imperata Brasiliensis）植物中提取的纤维素纸浆制备的，使用了常规和全无氯方法。最初，使用 Taguchi 正交数组进行了统计实验设计，以研究水解参数以及纳米纤维素的主要性质（结晶度、热稳定性、形态和尺寸）。进行了 X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、场发射扫描电子显微镜（FE-SEM）、动态光散射（DLS）、Zeta 电位和热重分析（TGA），以表征所获得的 CNs 的物理化学性质。在硫酸浓度为 64%（m/m）、温度 35°C、反应时间 75 分钟和纸浆与溶液比为 1:20（g/mL）的条件下，成功获得了直径在 10 至 60nm 之间且长度在 150 至 250nm 之间的纤维素纳米颗粒。在此条件下，巴西大薊的纤维素纳米颗粒在悬浮液中具有良好的稳定性，结晶度指数为 65%，纤维素降解温度约为 117°C。考虑到这些性质与其他木质纤维素原料的纳米纤维素相似，巴西大薊草似乎也是生产纳米纤维素的合适原料。
