Generation of SiO2-membranes from alkoxysilanes on porous supports

Siliceous membranes were brought onto the surface of filter media to improve their filtration properties. Using the sol-gel method, membranes with various shapes and properties could be reacted directly into a narrow surface region without bringing condensation products into the volume of the porous supports. A belt of filter media could be coated continuously and homogeneously using laboratory scale equipment. The coated filter media showed improved cleaning behaviour compared to uncoated samples.