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We report a new approach for the self-assembly of cuboid micro-parts onto Si substrates to construct three-dimensional microstructures. To perform assembly, the Si substrates are prepared with a deep cavity array as binding sites. An aggregate composed of hundreds of uniformly aligned micro-parts is formed at the C10F18-H2O interface. The micro-parts are arranged by passing the substrate through the aggregate of micro-parts, thus the micro-parts are left on the substrate, and then the substrate is vibrated ultrasonically in the solution, making it possible for the micro-parts to fall into the cavities on the substrate. Finally the substrate is pulled out of the solution after assembly. This technique could give a high yield of up to 70%, providing a new method for micro-assembly. 相似文献
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We employ Prasher's non-dimensional form to analyse the size effects on specific heat of Al thin films. Compared the calculation results of pure aluminium film with the experimental data, it is found that the reduction of phonon states is not the main reason of the size effect on the specific heat Al thin films with thickness from lOnm to 37Onm. However, the Al thin film in air usually has an oxidation layer and the specific heat of the layer is smaller than Al. By including the contribution of the oxidation layer to the thin-film specific heat, the calculation results are much closer to the experimental data. This may be a possible reason of the size effects on specific heat of Al thin films. 相似文献
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稀土过渡金属CaCu5型衍生化合物结构的原子级模拟 总被引:1,自引:0,他引:1
稀土过渡族金属化合物是功能材料研究领域的重要对象. 本文综述了CaCu5衍生型稀土过渡金属化合物Rn-mM5n 2m结构和变换关系的传统内容、含义, 以及在应用中的有效性和局限性. 从原子间相互作用势出发, 通过能量最小化对5类二元本征结构SmFe5, Sm2Fe17(H), Sm2Fe17(R), SmFe12(t), Sm3Fe29的空间群及晶格参数进行了计算, 并由此确定了这5类结构间的变换矩阵, 与传统矩阵变换关系作了对照, 分析了它们相近和相异的原因. 讨论了第三元素Cr, Ti对Sm3Fe29结构的稳定作用, 以及对晶体几何参数及X光谱的影响, 这都是传统矩阵变换反映不了的. 相似文献
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