DEVELOPMENT OF POROUS ZIRCONIA SPHERES BY POLYMERIZATION-INDUCED COLLOID AGGREGATION - EFFECT OF POLYMERIZATION RATE

被引：25

作者：

ANNEN, MJ

KIZHAPPALI, R

CARR, PW

MCCORMICK, A

机构：

[1] UNIV MINNESOTA,DEPT MAT SCI & CHEM ENGN,MINNEAPOLIS,MN 55455

[2] UNIV MINNESOTA,DEPT CHEM,MINNEAPOLIS,MN 55455

[3] UNIV MINNESOTA,INST ADV STUDIES BIOPROC TECHNOL,MINNEAPOLIS,MN 55455

来源：

JOURNAL OF MATERIALS SCIENCE | 1994年 / 29卷 / 23期

关键词：

D O I：

10.1007/BF00354551

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Polymerization-induced colloid aggregation is used to synthesize spheres of narrow size distribution which are porous aggregates of ZrO2 colloids. Variation of the reaction pH has been investigated to determine the optimum rate of polymerization of the urea-formaldehyde resin. At the optimum rate, a colloid packing structure is formed where a balance of high porosity and high strength of the aggregates is achieved. This optimum coincides with the maximum yield of the similar to 5 mu m sintered (polymer-free) particles. Particles synthesized at pH values below the optimum are mechanically weak; some are hollow spheres. Variation of the pore structure, and thus colloid packing structure, is elucidated by nitrogen adsorption and apparent density measurements. Differences on either side of the optimum pH are related to the efficiency of polymer-bridge formation between colloids.

引用

页码：6123 / 6130

页数：8

共 25 条

[1] ION-EXCHANGE AND LIGAND-EXCHANGE CHROMATOGRAPHY OF PROTEINS USING POROUS ZIRCONIUM-OXIDE SUPPORTS IN ORGANIC AND INORGANIC LEWIS BASE ELUENTS [J].