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首页> 外文期刊>Combustion and Flame >Metal catalyzed synthesis of carbon nanostructures in an opposed flow methane oxygen flame
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Metal catalyzed synthesis of carbon nanostructures in an opposed flow methane oxygen flame

机译：逆流甲烷氧火焰中金属催化合成碳纳米结构。

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Results of an experimental study on metal-catalyzed synthesis of carbon tubular nanostructures in opposed flow flame are reported. The catalytic support made of Ni-alloy was positioned at the fuel side of the opposed flow flame formed by fuel (96%CH_4+4%C_2H_2) and oxidizer (50%O_2+50%N_2) streams. The electron microscopy studies reveal the presence of highly organized carbonaceous structures with the configurations showing strong dependence on the flame location. Several typical structures were detected. These include: multiwalled nanotubes (MWNT), MWNT bundles, irregular high-density carbon nanofibers, long (up to 0.2 mm) uniform-diameter (～100 nm) nanofibers, helical regularly coiled tubular nanofibers, and ribbon-like coiled nanofibers with rectangular cross section. Transmission electron microscopy (TEM) studies performed on long nanofibers revealed the presence of highly organized multiple (～100) graphene layers. These layers are parallel to the nanofiber axis resembling the structure of MWNT. The TEM studies of coiled nanofibers show internal tubular structure and the presence of regular carbon lattice. The well-aligned bundles of nanotubes were examined by TEM showing tight packing of MWNTs with varying inner and outer diameters. The diversity of formed nanomaterials is attributed to the strong variation of flame properties along the flame axis including temperature, hydrocarbon and radical pool. This provides strong selectivity for formation of different nanoforms even without adjustment of catalyst properties.
机译：报道了在逆流火焰中金属催化合成碳管纳米结构的实验研究结果。由镍合金制成的催化载体位于由燃料（96％CH_4 + 4％C_2H_2）和氧化剂（50％O_2 + 50％N_2）流形成的对流火焰的燃料侧。电子显微镜研究表明存在高度组织的碳质结构，其构型显示出对火焰位置的强烈依赖性。检测到几种典型的结构。其中包括：多壁纳米管（MWNT），MWNT束，不规则的高密度碳纳米纤维，长（最大0.2 mm）均匀直径（〜100 nm）的纳米纤维，螺旋规则盘绕的管状纳米纤维和带状的矩形盘绕纳米纤维横截面。在长纳米纤维上进行的透射电子显微镜（TEM）研究表明存在高度组织化的多层（〜100）石墨烯层。这些层平行于纳米纤维轴，类似于MWNT的结构。卷曲纳米纤维的TEM研究显示内部管状结构和规则碳晶格的存在。 TEM检查了排列良好的纳米管束，显示出内径和外径变化的MWNT紧密堆积。形成的纳米材料的多样性归因于火焰特性沿火焰轴的强烈变化，包括温度，碳氢化合物和自由基池。即使不调节催化剂性能，这也提供了形成不同纳米形式的强大选择性。

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