Colloidal clusters of hollow silica nanospheres for enhanced UV scattering
발표자
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초록
내용
Hollow silica nanospheres were prepared by synthesizing core-shell particles with polystyrene(PS) cores and silica shells, followed by sintering the PS cores. By adjusting core size and shell thickness, it is possible to make a form factor that backscatters the light of UV rays. Due to the core-shell structure, hollow silica nanospheres can also look transparent in visible light by matching the refractive index of particles and medium. So, hollow silica nanospheres have shown potential as sunscreens because they can selectively reflect UV rays. Herein, we expected that colloidal clusters of hollow silica nanosphere can increase scattering intensities. First, colloidal clusters of core-shell(PS-silica) particles were prepared from oil-in-water (O/W) emulsions. Finally, colloidal clusters of hollow silica nanospheres were formed after evaporating the organic solvent and removing PS cores. When measuring the reflection of single particles and clusters, the reflection increased as the number of particles within the cluster increased.