凝胶燃烧法合成纳米复合钴蓝颜料

Nano complex cobalt blue pigments synthesized by gel-combustion method

以Co SO4·7H2O、Mg（CH3COO）2·4H2O、Al（NO3）3·9H2O为原料,琼脂为燃烧剂,采用凝胶燃烧法合成尖晶石型的MgxCo1-xAl2O4纳米蓝色陶瓷颜料。通过X-衍射（XRD）、差热-热重（TG-DTA）、扫描电镜（SEM）、能谱（EDS）、紫外-可见漫反射（UV-Vis DRS）等分析手段确定了颜料的物相、结构、粒径、组成以及对光谱的反射。结果表明：随着Mg2＋掺入量的增加,导致晶格发生小的畸变,粒子粒径减小,颜料位于蓝光区波段（435-500 nm）的反射率也越来越高,得到的蓝色颜料更明亮;以琼脂为燃烧剂,降低了颜料尖晶石结构的晶化温度。

Nanosized spinel type cobalt blue pigments of MgxCo1-xAl2O4 were synthesized by gel-combustion method using Co SO4·7H2O,Mg（CH3COO）2·4H2O and Al（NO3）3·9H2O as raw materials,and agar as incendiary agent. XRD,TG-DTA,SEM,EDS UV- Vis DRS were used to determine the pigment phase,structure,particle size,composition and reflection spectrum. The results indicate that increasing doping amount of Mg2＋leads to small distortion of the lattice and decrease of the particle size. The pigment reflectivity in blue band（435-500 nm）is also increased,thus the blue pigment becomes brighter. At the same time,the crystallization temperature of pigment with spinel structure is decreased by using agar as combustion agent.