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A Fenton-like System (Cu(II)/H2O2) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-10-28 , DOI: 10.1021/acs.iecr.9b03226 Mikhail A. Torlopov 1 , Ilia S. Martakov 1 , Vasily I. Mikhaylov 1 , Yevgeny A. Golubev 2 , Petr A. Sitnikov 1 , Elena V. Udoratina 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-10-28 , DOI: 10.1021/acs.iecr.9b03226 Mikhail A. Torlopov 1 , Ilia S. Martakov 1 , Vasily I. Mikhaylov 1 , Yevgeny A. Golubev 2 , Petr A. Sitnikov 1 , Elena V. Udoratina 1
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A preparation process of cellulose nanocrystals using a Fenton-like system was presented. Rod-shaped cellulose nanocrystals were isolated after treatment in the H2O2/acetic acid/2–6 mol % copper acetate system. The morphology and sizes of rod-shaped particles were determined by AFM (atomic force microscopy) and cryo-EM (cryo-electron microscopy). X-ray diffraction proves that the prepared particles have a natural polymorphic modification of cellulose I with a high crystallinity index. Thermogravimetry data indicates a slight decrease in thermal stability of the particles when compared to starting cellulose, correlating with an increase in the number of carbonyl groups determined by chemical analysis. Using pK spectroscopy, active acid–base surface sites (pKi 5.5 and 7.9) were quantitatively determined. The cellulose nanoparticles formed stable hydrosols. Using photometry and dynamic light scattering, it has been established that the critical concentration of coagulation of sols is 76 mM KCl.
中文翻译：
类芬顿体系（Cu（II）/ H 2 O 2）用于制备具有轻微改性表面的纤维素纳米晶体
提出了利用类芬顿体系制备纤维素纳米晶体的方法。在H 2 O 2 /乙酸/ 2-6 mol％乙酸铜体系中处理后，分离出棒状纤维素纳米晶体。棒状颗粒的形态和尺寸通过原子力显微镜（AFM）和低温电子显微镜（cryo-EM）（冷冻电子显微镜）测定。X射线衍射证明，所制备的颗粒具有高结晶度的纤维素I的天然多晶型变体。热解重量数据表明，与起始纤维素相比，颗粒的热稳定性略有下降，这与通过化学分析确定的羰基数目的增加有关。使用p K光谱，活性酸碱表面位点（pķ我5.5和7.9）进行定量。纤维素纳米颗粒形成稳定的水溶胶。使用光度法和动态光散射，已确定溶胶凝结的临界浓度为76 mM KCl。
更新日期：2019-10-28
中文翻译：
类芬顿体系（Cu（II）/ H 2 O 2）用于制备具有轻微改性表面的纤维素纳米晶体
提出了利用类芬顿体系制备纤维素纳米晶体的方法。在H 2 O 2 /乙酸/ 2-6 mol％乙酸铜体系中处理后，分离出棒状纤维素纳米晶体。棒状颗粒的形态和尺寸通过原子力显微镜（AFM）和低温电子显微镜（cryo-EM）（冷冻电子显微镜）测定。X射线衍射证明，所制备的颗粒具有高结晶度的纤维素I的天然多晶型变体。热解重量数据表明，与起始纤维素相比，颗粒的热稳定性略有下降，这与通过化学分析确定的羰基数目的增加有关。使用p K光谱，活性酸碱表面位点（pķ我5.5和7.9）进行定量。纤维素纳米颗粒形成稳定的水溶胶。使用光度法和动态光散射，已确定溶胶凝结的临界浓度为76 mM KCl。
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