Cellulose Nanowhiskers Isolation and Properties from Acid Hydrolysis Combined with High Pressure Homogenization
Cellulose Nanowhiskers Isolation and Properties from Acid Hydrolysis Combined with High Pressure Homogenization
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DOI：
10.15376/biores.8.1.933-943
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发表时间：
2013-01
期刊：
影响因子：
1.5
通讯作者：
Mingzhu Pan;Xiaoyan Zhou;Minzhi Chen
中科院分区：
文献类型：
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作者：
Mingzhu Pan;Xiaoyan Zhou;Minzhi Chen
本研究采用酸水解和高压均质相结合的方法分离纤维素纳米晶须，并研究了酸浓度（20、40和60 wt%）、水解温度（20、40和60 oC）和水解时间（2、4和6 h）对纤维素纳米晶须几何结构和化学性质的影响。在组合处理后，纳米颗粒呈棒状，直径为11至33 nm，长度为199至344 nm，纵横比为10至18，这是CNW的特征性质。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析表明，MCC在水解过程中发生了分子内氢键和糖苷键的断裂。酸浓度从20wt%增加到60wt%可以有效地加速纤维素分子中的这些断裂，导致具有较低结晶度的较窄的、较少多分散的纳米晶须。
This study focused on cellulose nanowhiskers (CNWs) isolation using a combination of acid hydrolysis and high pressure homogenization, and investigated the effects of acid concentration (20, 40, and 60 wt%), hydrolysis temperature (20, 40, and 60 oC), and hydrolysis time (2, 4, and 6 h) on the geometry and chemical properties. After the combined treatment, nanoparticles were rodlike with a diameter of 11 to 33 nm, a length of 199 to 344 nm, and aspect ratio of 10 to 18, which are characteristic properties of CNWs. Fourier transform infrared spectroscopy (FTIR) and x-ray photoelectron spectroscopy (XPS) analyses showed that some breakages of intramolecular hydrogen bonds and glycosidic bonds occurred during the hydrolysis reaction of MCC. An increase in acid concentration from 20 to 60 wt% could effectively accelerate these breakages in cellulose molecules, leading to narrower, less polydisperse nanowhiskers with lower crystallinity.