花粉辅助合成钴蓝中空微球及性能研究

Pollen-assisted Synthesis and Characterization of Cobalt Blue Hollow Microspheres

采用荷花花粉辅助共沉淀法制备球状氢氧化物/花粉前驱体,再经高温烧结制得中空微球钴蓝粉末样品。通过调节反应体系的pH值,探讨制备中空微球钴蓝结构的工艺条件。进一步对钴蓝样品进行表征,并提出中空微球钴蓝形成机理。结果表明:pH值对钴蓝的微观形貌及性能影响较大。当pH值为8.5时,制得形貌可控的中空微球钴蓝样品,微球层内存在二级多孔结构,样品的比表面积和比表面能增加,有助于提高光学性能。其呈色性能较优(L*=40.86,a*=-9.81,b*=-39.26),荷花花粉模板在蓝紫光区450—490 nm波段的反射率比未加花粉模板高出约13%,通过对无机钴蓝颜料性能研究将为化学材料的制备提供新方法。

In this paper,the hydroxide-coated pollen precursor was synthesized by the biological template method of lotus pollen,and then the cobalt blue powder samples were prepared by high-temperature sintering to remove the pollen template.The technological conditions for preparing the cobalt blue structure of hollow microspheres were discussed by adjusting the pH value of the reaction system.Furthermore,cobalt blue samples were characterized and the formation mechanism of cobalt blue hollow microspheres was analyzed.The results show that the reaction pH value affected the morphology and properties of cobalt blue.When the reaction pH value was 8.5,the cobalt blue powder sample was a hollow microsphere structure with secondary porosity.The specific surface area and specific surface energy of the sample increase,which was beneficial to improve the optical performance(L∗=40.86,a∗=-9.81,b∗=-39.26).The reflectivity and brightness of cobalt blue powder samples in the blue light region of 450-490nm were significantly improved.Studying the properties of inorganic cobalt blue pigment will provide a new method for the preparation of chemical materials.