摘要
采用机械力化学表面改性工艺,以硬脂酸为改性剂,在气流粉碎机中对纳米氧化锌进行解团聚和表面改性,并借助SEM、XRD、FT-IR和XPS对改性前后的氧化锌粉体进行结构表征.结果表明:硬脂酸分子化学键合在氧化锌表面.改性前后氧化锌的晶体结构相同,其颗粒的团聚性降低,二次粒径明显减小.通过测定改性样品的活化指数和亲油化度,选择最佳的改性剂用量为氧化锌质量的10%,氧化锌表面亲油疏水,在有机溶剂中有较好的分散性.
Industrial zinc oxide nanoparticles were modified with stearic acid by mechanochemical modification in jet mill by batch operation for the purpose of reducing the aggregation of ZnO nanoparticles. ZnO nanoparticles were characterized by SEM, XRD, FF-IR and XPS. A covalent bond was formed by chemical reaction between the hydroxyl groups on the surface of ZnO nanoparticle and carboxyl groups （ COO - ） of stearic acid. The modification did not alter the crystalline structure of ZnO nanoparticles. In addition, the aggregation of ZnO nanoparticles was greatly reduced and the twice particles size became smaller. The activation index and lipophilic degree of modified ZnO nanoparticles were measured and the optimal amount of stearic acid was 10 % weight of ZnO raw materials. ZnO nanoparticles had much better dispersibility in organic solvents after modification due to the lipophilic and hydrophobic groups on the surface of ZnO nanoparticles.
出处
《化学研究》
CAS
2008年第2期74-77,83,共5页
Chemical Research
基金
国家高技术研究发展计划资助项目(2002AA302607)
关键词
纳米氧化锌
表面改性
硬脂酸
ZnO nanoparticles
surface modification
stearic acid
