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q819921730 2008-06-09
During the preparation of the nano-products, these nano-units, such as nanoparticles, nanoclusters, nanowires and nanorods, can also self-assemble into the novel structural aggregates by several routes, including electron irradiation deposi... During the preparation of the nano-products, these nano-units, such as nanoparticles, nanoclusters, nanowires and nanorods, can also self-assemble into the novel structural aggregates by several routes, including electron irradiation deposition [19], chemical vapor deposition [20], laser vaporization-condensation [21], charge transferring [22], an organic reagent-assisted method [23], solution-liquid-solid method [24] and catalytic vapor-liquid-solid growth [25]. With these routes, various nanoscale or microscale aggregates can demonstrate novel architectures, including tree-like, web-like, spherical, nanowire-like, network and fishbone-like aggregates. As a well-known method for producing the nanocapsules, however, arc-discharge has been rarely used to synthesize the aggregates self-assembled by the nanocapsules prepared simultaneously in arc-discharge. Nevertheless, it is possible that the arc-discharge can be developed into a new way to synthesize the aggregates. In the present work, we utilized arc-discharge technique with modified strategies, involving changing the hydrogen pressure, introducing gadolinium - aluminum alloy ingot as the anode and adjusting the elements percent of the anode according to their evaporation pressure, to synthesize a new type of nanocapsules, with intermetallic compound GdAl2 as core and amorphous Al2O3 as shell, which enlarge the family of the magnetic nanocapsules. At the same time, the regularly aligned three-dimensional macro-aggregates self-assembled by the nanocapsules without any template and catalyst were simultaneously synthesized in arc-discharge process.
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yawei7
在编制纳米产品,这些纳米单位,如纳米粒子,纳米团簇,纳米线和纳米棒,也可以自我组装成小说的结构料的几个路线,包括电子辐照沉积[ 19 ] ,化学气相沉积[ 20 ] ,激光蒸发冷凝[ 21 ] ,电荷转移[ 22 ] ,是一个有机试剂的辅助方法[ 23 ] ,解决气液固方法[ 24 ]及催化汽液固增长[ 25 ] 。与这些路线,各种纳米或微型总量能证明小说的架构,包括植树一样,网络一样,球形,纳米线一样,网络和鱼刺一样的总量。作为一个的方法生产纳米囊,不过,电弧放电已很少使用合成总量的自组装由纳米囊准备,同时在电弧放电。不过,它可能是电弧放电,可以发展成为一种新方法合成的聚集。
在目前的工作,我们利用电弧放电技术的改良策略,涉及改变氢气压力,引进钆-铝合金锭作为阳极和调整的内容%的阳极根据其蒸发压力下,合成了一种新型纳米囊,与金属间化合物gdal2为核心和无定形氧化铝作为壳,扩大家庭的磁性纳米囊。在同一时间内,定期不结盟三维立体的宏观总量的自组装由纳米囊在没有任何模板和催化剂的同时,合成了在电弧放电过程。
19 0 2008-06-10 0条评论 回复
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