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Characterization of Carboxylated Cellulose Nanocrytals Isolated through Catalyst-Assisted H2O2 Oxidation in a One-Step Procedure
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1021/acs.jafc.8b00080 Roya Koshani 1 , Theo G. M. van de Ven 2 , Ashkan Madadlou 1
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1021/acs.jafc.8b00080 Roya Koshani 1 , Theo G. M. van de Ven 2 , Ashkan Madadlou 1
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A green and facile method was designed to isolate a type of cellulose nanocrystal (CNC) with carboxylated surfaces from native cellulose materials. Because isolation and modification processes of cellulosic particles are generally performed separately using harmful chemicals and multiple steps, the one-pot approach employed in this work is interesting from both an economical and ecological point of view. The reaction is carried out by adding hydrogen peroxide as an oxidant and copper(II) sulfate as a catalyst in acidic medium under mild thermal conditions. The charge content of the carboxylated CNC is about 1.0 mmol g–1, measured by a conductometric titration. Fourier transform infrared spectroscopy also proved the presence of carboxyl groups on the CNC particles. Atomic force microscopy along with optical polarized microscopy readily showed a rod shape morphology for the cellulosic particles. An average length of 263 nm and width of 23 nm were estimated by transmission electron microscopy. Dynamic laser scattering on carboxylated CNC suspensions by adding salt confirmed that nanoparticles are electrostatically stable. Carboxylated CNCs were furthermore characterized by solid carbon-13 nuclear magnetic resonance and X-ray spectroscopy.
中文翻译：
一步法通过催化剂辅助的H 2 O 2氧化分离出的羧基化纤维素纳米晶的表征
设计了一种绿色简便的方法来从天然纤维素材料中分离出一种具有羧基化表面的纤维素纳米晶体（CNC）。由于纤维素颗粒的分离和修饰过程通常是使用有害化学物质和多个步骤分别进行的，因此从经济和生态角度来看，这项工作中采用的“一锅法”都是很有趣的。通过在温和的热条件下在酸性介质中加入作为氧化剂的过氧化氢和作为催化剂的硫酸铜（II）进行反应。羧基化CNC的电荷含量约为1.0 mmol g –1，通过电导滴定法测量。傅里叶变换红外光谱也证明了CNC颗粒上羧基的存在。原子力显微镜和光学偏光显微镜很容易显示出纤维素颗粒的棒状形态。通过透射电子显微镜估计平均长度为263nm，宽度为23nm。通过添加盐在羧基化CNC悬浮液上进行动态激光散射，证实纳米颗粒具有静电稳定性。羧基化的CNCs的特征还在于固体碳13核磁共振和X射线光谱。
更新日期：2018-07-05
中文翻译：
一步法通过催化剂辅助的H 2 O 2氧化分离出的羧基化纤维素纳米晶的表征
设计了一种绿色简便的方法来从天然纤维素材料中分离出一种具有羧基化表面的纤维素纳米晶体（CNC）。由于纤维素颗粒的分离和修饰过程通常是使用有害化学物质和多个步骤分别进行的，因此从经济和生态角度来看，这项工作中采用的“一锅法”都是很有趣的。通过在温和的热条件下在酸性介质中加入作为氧化剂的过氧化氢和作为催化剂的硫酸铜（II）进行反应。羧基化CNC的电荷含量约为1.0 mmol g –1，通过电导滴定法测量。傅里叶变换红外光谱也证明了CNC颗粒上羧基的存在。原子力显微镜和光学偏光显微镜很容易显示出纤维素颗粒的棒状形态。通过透射电子显微镜估计平均长度为263nm，宽度为23nm。通过添加盐在羧基化CNC悬浮液上进行动态激光散射，证实纳米颗粒具有静电稳定性。羧基化的CNCs的特征还在于固体碳13核磁共振和X射线光谱。
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