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Membranes act as selective barriers and play an important role in processes such as cellular compartmentalization and industrial-scale chemical and gas purification. The ideal membrane should be as thin as possible to maximize flux, mechanically robust to prevent fracture, and have well-defined pore sizes to increase selectivity. Graphene is an excellent starting point for developing size-selective membranes1, 2, 3, 4, 5, 6, 7, 8 because of its atomic thickness9, high mechanical strength10, relative inertness and impermeability to all standard gases11, 12, 13, 14. However, pores that can exclude larger molecules but allow smaller molecules to pass through would have to be introduced into the material. Here, we show that ultraviolet-induced oxidative etching15, 16 can create pores in micrometre-sized graphene membranes, and the resulting membranes can be used as molecular sieves. A pressurized blister test and mechanical resonance are used to measure the transport of a range of gases (H2, CO2, Ar, N2, CH4 and SF6) through the pores. The experimentally measured leak rate, separation factors and Raman spectrum agree well with models based on effusion through a small number of ?ngstrom-sized pores 发自小木虫Android客户端 |
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| 膜作为具有选择性栅栏物质在如细胞划分、工业化学和气体净化发挥重要作用。理想的膜应该尽可能薄且膜通量尽可能最大,预防断裂的机械性强,有很好的增加选择性得孔隙。石墨烯由于具有原子层和机械强度、相对惰性、对所有标准气体的不渗透性，是很好发展选择性过滤膜。然而可以排除毛孔较大的分子但允许小分子通过将应用到材料中。在这里,我们指出,紫外腐蚀氧化可以创建毛孔微米大小的石墨烯膜,并且此膜可以作为分子筛。密封泡测试和机械共振是用来测量一系列通过毛孔的气体运输(H2,二氧化碳,Ar,N2,CH4和SF6)。实验测量了泄漏率,分离因子和拉曼光谱与模型通过埃米级孔积液量一致。 |
2楼2016-01-12 16:43:45