Effect of Ultra-Turrax on Nanocellulose Produced by Acid Hydrolysis and Modified by Nano ZnO by Sol-Gel Method

• 作者: Amanda Ramos Arag?o Melo Bráulio Soares Archanjo Jose Carlos Dutra Filho Maria Ines Bruno Tavares Raphael Verdan Curti Roberto Pinto Cucinelli Neto Wellington Silva Ferreira
• 来源期刊: 材料科学与应用期刊(英文)
• 学科: 工学
• 关键词: CELLULOSE Nanocrystal CELLULOSE Nanofibril NANO Zinc Oxide Acid HYDROLYSIS Sol-Gel
• 年，卷（期）: clkxyyyqkyw,（2）
• 页码范围: 150-166
• 页数: 17页
• 分类号: TB3

摘要

Cellulose nanocrystals (NCC) and cellulose nanofibrils (CNF) were obtained by a single step process, with synergy between 64% sulfuric acid hydrolysis and high shear from ultra-turrax stirring, which is an advantageous process for disintegrating cellulose microcrystalline and also may improve the hydrolysis process. The surface modification on the cellulose was performed by the sol-gel process, in which the sulfate groups from hydrolysis were replaced by nanoparticles of zinc oxide, which led to the increase of up to 54°C Tonset, according to thermogravimetric analysis (TGA) results. The morphology and crystallinity degree were characterized by Helium Ion Microscopy (HIM), atomic force microscopy (AFM) and X-ray diffraction. In addition, the ZnO band was observed in Fourier transform infrared spectroscopy, furthermore, the change in the zeta potential confirmed the cellulose modification. The changes in the values of proton spin-spin relaxation time for the systems showing the confined hydrogen in the rigid domains, confirmed the results observed with the aforementioned techniques, for both cellulose after hydrolysis and ZnO modified cellulose, suggesting that ZnO disrupted crystal formation in cellulose.