Silica nanoparticles with four circular surface patches made of polystyrene (PS) and arranged in a tetrahedral symmetry are synthesized through the multistep growth of the silica core of silica/PS tetrapods. Transmission electron microscopy and energy dispersive X-ray analysis studies indicate that, as the silica core regrows, its surface conforms to the shape of the polystyrene nodules, allowing good control of the size of the emerged fraction of these. Patches with an angular width as small as 49° were achieved, which is a prerequisite for their assembly in the form of a diamond crystal phase.

中文翻译：

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贴片尺寸可控的四面体斑片状纳米颗粒的合成

通过对二氧化硅/ PS四脚架的二氧化硅核进行多步生长，可以合成具有四个由聚苯乙烯（PS）制成且呈四面体对称形状的圆形表面贴片的二氧化硅纳米粒子。透射电子显微镜和能量色散X射线分析研究表明，随着二氧化硅核的生长，其表面与聚苯乙烯结核的形状相符，从而可以很好地控制其中出现的部分的大小。实现了角宽度小至49°的贴片，这是将它们组装成金刚石晶体相形式的先决条件。