Control of Porous Materials Structure Based on the Design of Surface Interaction between Fine Particles by Surface Modification

基于表面改性细颗粒间表面相互作用设计的多孔材料结构控制

基本信息

批准号：
10650662
负责人：
KAMIYA Hidehiro
金额：
$ 2.18万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

In order to prepare high performance and high reliability ceramics, it is necessary to avoid the irregular aggregate structure in their original ceramic slurries before green compact formation. In order to control the aggregation structure of ceramic powders in slurry, polymer dispersants are generally added. However, since the mechanism of polymer dispersants adsorbed on powder has not been clarified, the amount and molecular structure of polymer dispersant (hydrophobic to hydrophilic ratio, e.g.), pH, counter-ion concentration to obtain the minimum suspension viscosity have been often decided by an empirical approach.In this work the systems of the powder of silica, alumina, silicon nitride with and without metal oxide additives and silicon carbide have been chosen to clarify the action mechanism of polymer dispersant in dense suspension and to correlate the macroscopic suspension viscosity and microscopic surface interaction between particles measured by an atomic force microscopy (AFM).The following topics have been focused :1) Influence of particle diameter on surface silanol structure, hydration force, and aggregation behavior of alkoxide-derived silica particles2) Effect of anionic polymer dispersant structure and content on dense alumina suspension viscosity analyzing with the electrosteric interaction of polymer dispersant by AFM and colloid probe AFM under different counter-ion densities3) Analysis of anionic polymer dispersant behavior in dense silicon nitride suspensions with and without oxide additives by using AFM and colloid probe AFM4) Effect of anionic polymer dispersant structure and aggregation behavior on dense silicon carbide suspension characteristics and slip-casted green body structure5) Control of microstructure and surface behavior of silica gel prepared from metal oxide

为了准备高性能和高可靠性陶瓷，有必要在绿色紧凑的形成之前避免其原始陶瓷浆中的不规则聚集结构。为了控制浆液中陶瓷粉的聚合结构，通常会添加聚合物分散剂。但是，由于尚未澄清聚合物分散剂的机制，因此聚合物分散剂的量和分子结构（疏水性与亲水比，例如），pH，反离子浓度以获得最小悬浮粘度的最小悬浮粘度通常是通过经验方法决定的。已经选择了碳化硅来阐明聚合物分散剂在密集悬浮液中的作用机制，并将宏观悬浮液粘度和微观表面相互作用与原子力显微镜（AFM）测量的颗粒之间的显微镜表面相互作用。 particles2) Effect of anionic polymer dispersant structure and content on dense alumina suspension viscosity analyzing with the electrosteric interaction of polymer dispersant by AFM and colloid probe AFM under different counter-ion densities3) Analysis of anionic polymer dispersant behavior in dense silicon nitride suspensions with and without oxide additives by using AFM and colloid probe AFM4) Effect of anionic聚合物分散剂结构和聚集行为对密集的碳化硅悬浮液特性和滑动绿色体结构5）控制由金属氧化物制备的硅胶的微结构和表面行为