碳纳米管聚团弹性体的结构调变

Structure Control of Agglomerate of Carbon Nanotube Elastomer

为得到更加密实的碳纳米管聚团弹性体，使之成作为一种能量吸收材料，在化学气相沉积制备碳纳米管过程中，提出通水提高Co～Mo—Al2O3催化剂裂解乙烯的活性，以便在短时间内促进碳纳米管快速生长的方法，可将碳纳米管聚团密度由40-65kg／m^3提高至120～140kg／m^3。结果表明，所得碳纳米管聚团结构具有明显的二级聚团孔结构分布特征，二级聚团压缩响应特征，并具有明显的高密度压缩体的优点，能够在较小的体积吸收更多能量。

To obtained carbon nanotubes agglomerate with high density, potentially used as energy-adsorbing materials, the method of adding water in the conventional chemical vapor deposition process was proposed. The effect of water was to increase the activity of the Co-Mo-Al2O3 catalyst for decomposing ethylene and to increase the amount of carbon nanotubes drastically in short time. By this way, the density of carbon nanotubes agglomerate increased from 40-65 kg/m^3 to 120-140 kg/m^3. The results showed that the as-obtained carbon nanotubes agglomerates had obvious multi-scale pore size distribution and the secondary stage compression behaviors, which had advantages to become more compact structure to absorb large amounts of energy in volumetric view.