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笼形分子结构的富勒烯(C_(60)、C_(70)等)具有多种奇特的物理、化学性质,已成为材料科学研究的前沿课题.有人预言它可能具有一定的润滑性,是一种“密集型分子滚珠轴承”型润滑剂.但到目前为止,尚未有充足的实验证据.据报道,C_(60)及C_(70)在常温下沉积在不同底材上时构成不同的晶体结构,在金(Au)表面上为面心立方结构(a=14.2(?)),在玻璃表面为六角密堆积结构(a=10.05(?), c=16.41(?)).而且它们还有温度相变现象.Wragg还发现C_(60)/C_(70)混合富勒烯在石墨表面构成密堆积结构晶体.Guo等人指出其面心立方密堆积在能量上低于六角密堆积,因而相应稳定一些.
The cage molecular structure of fullerenes (C_ (60), C_ (70), etc.) has a variety of unique physical and chemical properties, has become the forefront of materials science research project.It was predicted that it may have some lubricity is A kind of “dense molecular ball bearing” lubricant, but so far there is not enough experimental evidence.It is reported that C_ (60) and C_ (70) have different depositions on different substrates at room temperature The crystal structure was a face-centered cubic structure (a = 14.2 (?)) On the gold (Au) surface and a hexagonal close packed structure (a = 10.05 (?), C = 16.41 (?)) On the glass surface. As well as the phase transition of temperature.Wragg also found that C_ (60) / C_ (70) mixed fullerenes form close-packed structure crystals on the surface of graphite.Guo et al. Pointed out that their face-centered cubic packing is energetically lower than that of hexagonal close- , So a correspondingly stable number.