Preparation of movable 3D periodic structures of silica spheres
Monodispersed silica spheres were prepared by hydrolysis of tetraethyl orthosilicate (TEOS) in the presence of water and ammonia in ethanol medium. The net negative charge on the surface of SiO2 spheres was enhanced after ageing silica spheres under suitable condition. Thus, a novel viscous liquid composed of mono-dispersed silica spheres was obtained. Due to the existing net repulsive forces between particles, the viscous liquid can quickly form a movable 3D periodic ordered structure with vivid color, indicating a high degree of ordering of the particles.
Key wordsSilica spheres Three-dimensional Colloidal
CLC numberO343.2 O753
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