Development of Functional Carbon Material by Pressure Pyrolysis of Organometallic Compounds

利用水热加压热解法可以成功地制备出多种磁性颗粒分散的炭材料。在该方法中，通过将有机溶剂与有机金属化合物如二茂铁衍生物混合来制备均匀的前体溶液。该溶液共聚后，在500-700 ℃的温度范围内进行加压热解。由于热解是在密闭加压系统中进行的，因此炭化效率高达70%左右。可以选择金属、金属合金、金属碳化物和金属氧化物作为分散的磁性颗粒，以获得所需的磁性能。这些磁性颗粒高度分散在碳基质中作为单一域。碳的形态变化取决于金属含量和热解条件。有机前驱体的压力热解在液相中发生微相分离，导致所产生的碳的形态控制。在这些碳中，铁氧体分散碳由于具有宽的矫顽力范围和高的饱和磁化强度而显示出诱人的性能。这些碳材料有望在催化剂、机械轴承、磁屏蔽等方面得到广泛的应用。

Many kinds of carbons dispersed with magnetic particles could be successfully synthesized by pressure pyrolysis using a hydrothermal apparatus. In this method, homogeneous precursor solutions were prepared by mixing an organic solvent with organometallic compounds such as ferrocene derivatives. After copolymerization of this solution, pressure pyrolysis was carried out in the temperature range 500-700ﾟC. The carbonization efficiency was as high as about 70% since the pyrolysis was proceeded in the close system under pressure. Metal, metal alloy, metal carbide and metal oxide can be selected as a dispersed magnetic particles to get desired magnetic properties. These magnetic particles are highly dispersed in the carbon matrix as a single domain. The morphologies of the carbons changed depending on the metal contents and pyrolysis conditions. The pressure pyrolysis of organic precursors takes place with microphase separation in liquid phase, resulting in the morphological control of the produced carbons. Among these carbons, ferrite dispersed carbons show the attractive properties because of wide range coercive force and high saturation magnetization. These carbons are expected to be applied extensively for catalyst, mechanical bearing, magnetic shield and others.