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将Al片在较高的电压下进行阳极氧化,制备了氧化铝纳米线。其形成机制主要是多孔氧化铝膜生长的同时,其微结构单元阵列在薄膜应力作用下沿薄壁处破裂,从而生成了氧化铝纳米线。扫描电镜和透射电镜观测表明,所得产物结构外形基本一致,呈凹柱面正三棱柱形,表观直径约30～300nm,长度为几微米至数十微米。采用BET法对产物的比表面积进行测量,实验值为5.8×104m2/kg,接近于理论计算值6.2×104m2/kg。实验表明,这种氧化铝一维纳米结构材料对超小Ag和CdS纳米颗粒具有较强的吸附能力,对很难用传统的过滤和离心沉淀法去除的超小纳米颗粒(直径小于10nm)也能做到有效吸附,有望成为超级吸附与过滤材料。
The Al sheets were anodized at a higher voltage to prepare alumina nanowires. Its formation mechanism is mainly porous alumina film growth at the same time, the microstructure of the cell array under the film stress rupture along the thin wall, resulting in alumina nanowires. Scanning electron microscopy and transmission electron microscopy observations show that the resulting product structure is basically the same shape was concave cylindrical equilateral prism, the apparent diameter of about 30 ~ 300nm, the length of a few microns to tens of microns. BET specific surface area of the product was measured, the experimental value of 5.8 × 104m2 / kg, close to the theoretical calculated value of 6.2 × 104m2 / kg. Experiments show that the one-dimensional alumina nanostructured materials have strong adsorption capacity for ultra-small Ag and CdS nanoparticles. Ultra-small nanoparticles (diameter less than 10 nm) that are difficult to remove by traditional filtration and centrifugal precipitation methods Can be effectively adsorbed, is expected to become super adsorption and filtration materials.