Abstract:

The ordered arrays of titanium dioxide（TiO₂）and polystyrene（PS）core-shell microspheres were prepared from composite suspensions of TiO₂ colloidal particles with nanometer size and polystyrene colloidal particles with submicron size by using the vertical co-deposition method.By this way，the preparation and assembly of core-shell microspheres could be realized synchronously.This kind of ordered arrays of core-shell microspheres had many special optical properties，such as generating a complete band-gap.After removing the PS colloidal crystal template，ordered arrays of hollow TiO₂ microspheres were formed.The effect of the volume ratio（R）of PS to TiO₂ colloidal particles on the formation of ordered arrays was investigated.The results showed that a proper volume ratio R（6∶1）was of importance to the formation of ordered arrays of hollow microspheres.When R was lower than 6∶1，an unconnected macroporous structure would be generated.On the contrary，when R was higher than 6∶1，neither the macroporous structure nor the ordered arrays of hollow microspheres could be fabricated.Furthermore，the comparative experiment of the immersed infiltration method showed that the formation of hollow TiO₂ microspheres should be caused by the shrinkage of nanometer TiO₂ spheres during the crystal transformation of TiO₂ materials.

摘要：

利用纳米级二氧化钛（TiO₂）溶胶微粒与聚苯乙烯（PS）胶体颗粒的混合悬浮液，以垂直共沉积的方法制备了核壳型PS/TiO₂微球的有序排列。当利用煅烧的方法去除PS胶粒晶体模板后，可以形成空心TiO₂微球的三维有序排列。考察了混合悬浮液中两种胶体颗粒的体积比（PS∶TiO₂=R）对空心TiO₂微球有序排列形成的影响。实验结果表明，合适的R值（6∶1）对于空心微球有序排列的形成至关重要。与此同时，浸渍填充法对照实验的结果表明，煅烧过程中TiO₂纳米颗粒晶型转化引起的收缩是造成TiO₂空心球产生的主要原因。