硫酸钡粒径调控剂C-N-CDs的制备、应用及机理

Synthesis, Application, and Mechanism of Barium Sulfate Particle Size Modifiers C-N-CDs

通过柠檬酸与乙二胺水热反应制备羧基、氨基修饰碳点(C-N-CDs),其具有优异的硫酸钡粒径调控作用:可使沉淀法制备的BaSO_(4)颗粒平均粒径减小到45.3 nm,小于同等条件下传统配位剂乙二胺四乙酸(EDTA)调控制备的BaSO_(4)颗粒平均粒径(73.7nm)。将所制备的纳米BaSO_(4)样品添加进聚乙烯醇(PVA)薄膜中可增强薄膜的力学性能。研究发现C-N-CDs的化学性能、表面电性、空间位阻是影响BaSO_(4)粒径大小的重要因素。

In this paper, carboxyl and amino-modified carbon dots(C-N-CDs) were prepared with citric acid and ethylenediamine by hydrothermal reaction, which have excellent particle size regulation of barium sulfate: the average particle size of BaSO_(4)particles prepared by the precipitation method can be reduced to 45.3 nm, which is smaller than the average particle size of BaSO_(4)particles prepared by traditional complexing agent ethylenediaminetetraacetic acid(EDTA) regulation under the same conditions(73.7 nm). The as-prepared nano BaSO_(4)sample showed an excellent nano-toughening effect when added to polyvinyl alcohol(PVA) films. The chemical properties, surface electrical properties, and spatial site resistance of C-N-CDs were found to be important factors influencing the size of BaSO_(4)particles.