乙二醇在络合物溶胶-凝胶法中的作用
来源期刊：中南大学学报(自然科学版)1999年第2期
论文作者：尹邦跃 王零森 樊毅 张金生
文章页码：62 - 65
关键词：络合物;溶胶凝胶法;乙二胺四乙酸;氧化锆;乙二醇
Key words：complex; sol-gel method; ethylenediaminetetraacetic acid; zirconia; ethylene glycol
摘 要：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．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，改善了凝胶稳定性，从而制得均匀透明的凝胶，并在一定程度上减少了硬团聚；先后经400℃，2h及700℃，2h煅烧，粉末比表面积 为35 m２/g，平均粒径约28 nm，颗粒尺寸分布范围极窄，中位径d５０仅为0.44μm，且大多为软团聚．
Abstract: Nanometer ZrO2-8% Y2O3 (molar fraction) powders were 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 with ethylene glycol in the polymerized complexes, gel stabilization and homogeneity were improved, and the amount of hard agglomerates was decreased to some extent. The powders, calcined at 400 ℃ for 2 h and 700 ℃ for 2 h, had a specific surface area of 35 m 2/g and average particle size of 28 nm with very sharp distribution and median particle size of 0.44 μm, mostly being soft agglomerates.
