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Preparation Of Monosize Silica Spheres And Their Crystalline Stack

S. Chen
Published 1998 · Chemistry

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Abstract Monosize silica spheres, 0.1∼3 μm in diameter, were prepared through the hydrolysis and condensation of tetraethylorthosilicate (TEOS) in aqueous ethanol or methanol solutions with ammonia as catalyst. A suspension of the monosize silica, dispersed in EtOH, H 2 O or a mixture of them, was allowed to sediment, and an ordered, crystalline phase was formed due to an electrostatic repulsion between the silica spheres. Through replacing the H 2 O or EtOH, in a step wise manner, with another solvent, which is miscible with H 2 O and EtOH, the Zeta potential on the surface of the silica spheres was reduced, until an ordered closed packed SiO 2 material was formed. Because of the monodispersity of the silica spheres, the ordered closed packed SiO 2 has a uniform pore size, which can be calculated from the monosize particle's diameter, and can be changed arbitrarily by selecting the size of the monosize silica constructing the SiO 2 materials.
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