申请人:Barron Andrew R.
公开号:US06936306B1
公开(公告)日:2005-08-30
This invention relates generally to a method for controlling the pore size, pore size distribution and porosity of aluminum-oxide based ceramics through the choice of substituents on carboxylate-alumoxanes and aluminum-oxide nanoparticles. The method allows for the formation of intra-granular pores in the nanometer range to be created in alumina and aluminum oxide ceramic bodies. The control over pore size and pore size distribution is accomplished through the use of different chemical substituents on the carboxylate-alumoxanes and aluminum-oxide nanoparticles. The size and distribution of pores within the alumina-oxide ceramic are dependent on the identity of the carboxylate substituents. In particular the formation of intra-versus inter-granular porosity is dependent on the identity of the carboxylate substituents. The invention also provides methods for the manufacture of ceramic coatings on ceramic and carbon fibers for composite applications and ceramic membranes with nanometer sized pores. The pore size, pore size distribution and porosity, and hence the strength, permeability and surface adhesion, of the ceramic coating is controlled by the choice of substituent on the carboxylate-alumoxane. Thermolysis of self supporting spun layers of the carboxylate-alumoxanes results in disks of alumina with controlled pore size, pore size distribution and porosity. In an alternative method a porous substrate is dipped or coated with a solution of the carboxylate-alumoxane, followed by thermolysis to produce a composite membrane.
本发明涉及一种通过选择羧酸酯-氧化铝簇和氧化铝纳米粒子上的取代基来控制氧化铝基陶瓷的孔径、孔径分布和孔隙度的方法。该方法允许在氧化铝和氧化铝陶瓷体中创建纳米级别的颗粒内孔。通过在羧酸酯-氧化铝簇和氧化铝纳米粒子上使用不同的化学取代基,实现对孔径和孔径分布的控制。氧化铝陶瓷内的孔径和孔径分布的大小和分布取决于羧酸酯取代基的身份。特别是,颗粒内孔与颗粒间孔的形成取决于羧酸酯取代基的身份。本发明还提供了制造用于复合材料和陶瓷膜的陶瓷涂层的方法,以及具有纳米级孔径的陶瓷膜。陶瓷涂层的孔径、孔径分布和孔隙度,以及强度、渗透性和表面附着力,由羧酸酯-氧化铝簇的取代基选择来控制。将羧酸酯-氧化铝簇的自支撑纺丝层热解,可产生具有控制的孔径、孔径分布和孔隙度的氧化铝圆盘。在另一种方法中,多孔基底被浸入或涂覆羧酸酯-氧化铝簇的溶液,然后通过热解来产生复合膜。