Phosphorylated cellulose nanocrystals: Optimizing production by decoupling hydrolysis and surface modification
Phosphorylated cellulose nanocrystals: Optimizing production by decoupling hydrolysis and surface modification
复制标题
磷酸化纤维素纳米晶体：通过解耦水解和表面改性来优化生产
DOI：
10.1016/j.carbpol.2023.121560
复制
发表时间：
2024
影响因子：
11.2
通讯作者：
Etale A
中科院分区：
文献类型：
--
作者：
Etale A
磷酸化纤维素纳米晶体的分离需要尿素和磷酸。除了限制纳米晶体的溶解外，尿素还促进纤维的溶胀，从而增加磷酸化剂的进入。本研究的目的是确定分离高度带电的磷酸化CNCs的最佳条件。使用的实验方法的设计，十七个实验，其中反应时间，尿素，和酸浓度变化，进行。采用两步法，首先通过磷酸处理分离CNCs，然后用偏磷酸和尿素处理。它表明，一个实验的设计方法的磷酸化的CNCs允许一个低得多的比例比以前报道的尿素酸。使用这种方法，具有高表面电荷（~1800 mmol kg−1）的CNC是可能的。该信息对于具有多种应用的纤维素纳米材料的磷酸化具有指导意义，水净化和医用生物材料。
Urea and phosphoric acid are essential for the isolation of phosphorylated cellulose nanocrystals (CNCs). Besides limiting dissolution of nanocrystals, urea facilitates the swelling of fibres thus increasing access for the phosphorylating agent. The aim of this study was to determine optimal conditions for isolation of highly charged phosphorylated CNCs. Using a design of experiments approach, seventeen experiments in which reaction time, urea, and acid concentrations were varied, were conducted. A two-step process was used, in which CNCs were first isolated by treatment in phosphoric acid, and then treated with metaphosphoric acid, and urea. It is shown that a design of experiments approach to the phosphorylation of CNCs allows a much lower ratio of urea to acid than has previously been reported. CNCs with high surface charge (~1800 mmol kg−1) are possible using this method. This information is instructive to phosphorylation of cellulose nanomaterials which have a variety of applications e.g., water purification and medical biomaterials.