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Structural modification of nanoporous carbon with single wall carbon nanotube.

机译：用单壁碳纳米管对纳米孔碳进行结构修饰。

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A novel CC nanocomposite was synthesized by pyrolysis of well dispersed individual functionalized SWNTs in a thermosetting resin, poly(furfuryl alcohol) (PFA). Strong interaction between SWNT and nanoporous carbon derived from PFA (PFA-NPC) was obtained with this strategy and the integrity of SWNTs was maintained after heat treatment.; Usually, it is challenging to separate SWNT bundles and disperse them in preparation of composites. 50 wt% SWNT/NPC composites prepared with solution blending showed mass transfer rate of ∼140% higher than the original NPC. The improvement was not significant due to poor dispersion and the bundle structure of SWNTs. Functionalization of SWNTs successfully separated the SWNT bundles and solved the problems of dispersion. In this process, the SWNTs were first functionalized with sulfonic acid groups (SA-SWNT) on sidewall. Then they were converted to PFA-grafted SWNT (PFA-SWNT) by in situ polymerization of furfuryl alcohol (FA). NPC/SWNT nanocomposite was generated by pyrolysis of PFA-SWNT at 600°C.; The structural transformation of NPC/SWNT at high temperature was studied by heating it at temperatures from 1200 to 2000°C in vacuum and characterized with HRTEM and Raman spectra. It was found that NPC and SWNT coalesce upon heat treatment and NPC tended to graphitize along the axis of neighboring nanotubes at temperature higher than 1400°C. Complete graphitization of NPC and SWNTs was obtained at 2000°C, when the NPC transformed to graphitic nanoribbons (GNRs) and SWNT or DWNT collapsed within the confines of the GNR.; The mass transfer rate in 0.05 wt% SWNT/NPC nanocomposite was ∼2 times higher than that in the pure NPC. Similar improvement required SWNT concentration of ∼60 wt% in the SWNT/NPC composites prepared by solution blending. SWNT/NPC nanocomposite fibers prepared from 0.1 wt% SA-SWNT/FA had ∼13% increase of Young's modulus over the pure NPC fibers when they were pyrolyzed at 400 -- 1600ºC. The augment was slightly higher than Halpin-Tsai's model prediction for composites with randomly dispersed fibers, indicating that the strong interaction between NPC and SWNT strengthened the material.
机译：通过将分散良好的单个官能化单壁碳纳米管在热固性树脂聚糠醇（PFA）中热解合成了新型CC纳米复合材料。通过这种策略，SWNT和衍生自PFA（PFA-NPC）的纳米孔碳之间具有强相互作用，并且在热处理后仍保持SWNT的完整性。通常，将SWNT束分开并分散以制备复合材料是一项挑战。通过溶液共混制备的50 wt％SWNT / NPC复合材料的传质速率比原始NPC高约140％。由于分散性差和单壁碳纳米管的束结构，改善并不明显。单壁碳纳米管的功能化成功地分离了单壁碳纳米管束，并解决了分散问题。在此过程中，首先用侧壁上的磺酸基团（SA-SWNT）对SWNT进行功能化。然后通过糠醇（FA）的原位聚合将其转化为PFA接枝的SWNT（PFA-SWNT）。 NPC / SWNT纳米复合材料是通过在600°C下热解PFA-SWNT生成的。通过在真空中将NPC / SWNT在1200至2000°C的温度下加热进行研究，并通过HRTEM和拉曼光谱对其进行表征。发现在热处理时NPC和SWNT会聚结，并且NPC在高于1400℃的温度下倾向于沿相邻纳米管的轴石墨化。当NPC转变为石墨纳米带（GNRs）且SWNT或DWNT塌陷在GNR范围内时，在2000℃获得了NPC和SWNT的完全石墨化。 0.05 wt％SWNT / NPC纳米复合材料的传质速率比纯NPC的传质速率高约2倍。类似的改进要求通过溶液共混制备的SWNT / NPC复合材料中的SWNT浓度约为60 wt％。当在400-1600ºC下进行热解时，由0.1 wt％SA-SWNT / FA制备的SWNT / NPC纳米复合纤维的杨氏模量比纯NPC纤维高约13％。对于具有随机分散纤维的复合材料，其增强作用略高于Halpin-Tsai的模型预测，表明NPC和SWNT之间的强相互作用增强了材料。

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