| 摘要 |
PROBLEM TO BE SOLVED: To provide: silica nanoparticles that are uniform in size and/or rapidly soluble in common or safe solvents, and are suitable as templates for preparing membranes of controlled pore sizes and pore arrangements; and a method of producing the same.SOLUTION: A method of preparing silica nanoparticles having a diameter of about 50 to about 1000 nm and a particle density of about 1.96 g/cm3 or less comprises: (a) reacting an orthosilicate and an alcohol or a mixture of alcohols in an aqueous solution in the presence of a salt of a metal of Group Ia or Group IIa or in the presence of a metalloid compound, optionally in combination with ammonium hydroxide, b) isolating the resulting nanoparticles, and (c) treating the nanoparticles from the step (b) with an acid. |
