乙二醇在络合物溶胶-凝胶法中的应用研究

STUDY ON APPLICATION OF ETHYLENE GLYCOL IN THE COMPLEX SOL-GEL METHOD

采用ＥＤＴＡ（乙二胺四乙酸）溶胶－凝胶法制备了ＺｒＯ２－８％Ｙ２Ｏ３（摩尔分数）纳米粉末，并研究了乙二醇对粉末平均粒径和团聚体强度的影响机理．结果表明：在溶液中加入乙二醇，可取代氢键而参与ＥＤＴＡ络合物分子之间的聚合反应，改善凝胶稳定性，从而制得均匀透明的凝胶，并在一定程度上减少了硬团聚．经４００℃，２ｈ再升至７００℃保温２ｈ煅烧后，粉末比表面积为３５ｍ２／ｇ，平均粒径约２８ｎｍ；颗粒尺寸分布范围极窄，中位粒径ｄ５０仅为０．４４μｍ，且大多为软团聚．

Nanometer ZrO2-8% Y2O3 (in mole)powder was prepared by the EDTA(ethylenediaminetetraacetic acid )sol-gel method, and the effects of ethylene glycol on the average particle size and strength of agglomerates were studied. The results show that, because of replacement of hydrogen bonds when adding ethyene glycol in the polymerized complexes, gel stability and homogeneity are improved, and the amount of hard agglomerates is reduced to some extent. The powder, calcined at 400 for 2 h and 700 for 2 h, has a specific surface area of 35 m2/g and average particle size of 28 nm with very narrow distribution and median particle size of 0.44 m, mostly being soft agglomerates.