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利用乳液聚合方法制备了粒径约为262 nm的单分散聚苯乙烯(PS)微球。通过控制溶剂蒸发温度和液体表面下降的速度,用垂直沉积法较快速地制备出了在较大范围呈现很好有序性的密排结构聚苯乙烯胶体光子晶体,其在626 nm波长处存在光子带隙。在扫描电子显微镜(SEM)下,观察到该胶体光子晶体是面心立方(fcc)密排结构。实验结果表明,对于粒径为262 nm的聚苯乙烯微球,在温度为55℃,质量分数为0.3%的情况下,当液体表面下降的速度约为每天3 mm时,可以得到高质量的胶体光子晶体。这种高质量的胶体光子晶体可以为利用模板技术制备具有完全带隙的有序孔结构提供较理想的模板。
Monodisperse polystyrene (PS) microspheres with a diameter of about 262 nm were prepared by emulsion polymerization. By controlling the evaporation temperature of the solvent and the rate of liquid surface descent, the close-packed polystyrene colloidal photonic crystal with close-packed structure in a wide range was prepared rapidly at the wavelength of 626 nm Photonic bandgap. Under scanning electron microscopy (SEM), it was observed that the colloidal photonic crystal is a face-centered cubic (fcc) packed structure. The experimental results show that for the polystyrene microspheres with a particle size of 262 nm, when the liquid surface descends at a speed of about 3 mm per day at a temperature of 55 ° C. and a mass fraction of 0.3%, a high quality Colloidal photonic crystal. This high quality colloidal photonic crystal can provide ideal template for the preparation of ordered pore structure with complete band gap by using template technique.