抄録
Porous glass membrane is obtained by phase separation method, sol-gel method and crystallized glass method. Phase separation method is most important and sol-gel method is the second. Crystallized glass method is highly potential and will be important in the future. In case of porous glass obtained by sol-gel method, the range of composition is wider. The most important feature of glass membrane compared to the other inorganic membranes is shaping ability.
Pore soze control by phase separation method is carried out by heat treatment process and acid treatment process. In sol-gel method, there are many factors influenced on the pore size, for example, amount of solvent, concentration and kinds of catalyst for hydrolysis. Generally speaking, the pore size control less than 5 nm by phase separation method is very difficult, however, by sol-gel method the control is possible in such a pore size regime.
Surface modification is carried out by impregnation method, reaction with organic compounds including organosilicones and alcohols, vapor deposition method and sol-gel coat. In small pore regime, surface modification controls the pore size at the same time.
