Forecasting continuous carbon nanotube production in the floating catalyst environment
Forecasting continuous carbon nanotube production in the floating catalyst environment
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DOI：
10.1016/j.cej.2020.124497
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发表时间：
2020-06
影响因子：
15.1
通讯作者：
J. Bulmer;Adarsh Kaniyoor;T. Gspann;Jenifer Mizen;J. Ryley;Patrick J. Kiley;Gijs H. J. M. Ratering-
中科院分区：
文献类型：
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作者：
J. Bulmer;Adarsh Kaniyoor;T. Gspann;Jenifer Mizen;J. Ryley;Patrick J. Kiley;Gijs H. J. M. Ratering-
我们提出了经过验证的统计模型和单变量相关性，从浮动催化剂化学气相沉积（FC-CVD）反应器中连续提取碳纳米管（CNT）的纺织性能（比电导率，拉曼G:D比和质量产率）。这包括直接控制的反应器设置（如前驱体浓度、气体流速、炉温和缠绕速度）、间接参数（如环境温度和压力）以及与时间相关的反应器影响（如反应器管龄）。考虑了两种不同前驱体输送结构的立式FC-CVD反应器：1)前驱体作为液体溶液预先混合在一起，直接注入反应器；2)使用基于科里奥利的微流体质量流量控制器将蒸发的前驱体独立注入气相，并使用FTIR光谱在线监测浓度。有利于高导电性纤维的因素包括：较低的氢气流量，稀薄的燃料-气体混合物，较高的缠绕速率，较高的氩气流量，与许多噻吩浓度与其他参数相互作用；对于拉曼G:D比最高的情况：燃料-气体混合物更稀薄，噻吩浓度更低，氢气流量更高，外部实验室压力更大；但就收益率而言，系统性趋势更难辨别。本研究展示了FC-CVD反应器的可预测性程度，对FC-CVD参数的影响进行了定量排序，并确定了纤维“可纺性”区域，这与最近文献中实验结果的荟萃分析非常吻合。
We present validated statistical models and univariate correlations of carbon nanotube (CNT) textile properties (specific electrical conductivity, Raman G:D ratio and mass yield rate) extracted continuously from floating catalyst chemical vapour deposition (FC-CVD) reactors over a uniquely wide multivariate experimental space. This includes directly controlled reactor settings (e.g.precursor concentrations, gas flow rates, furnace temperatures and winding speeds), indirect parameters (e.g.ambient temperature and pressure), and time-dependent reactor influences such as reactor tube age. Two vertical FC-CVD reactors, with different precursor delivery architectures, were considered: 1) in which precursors were pre-mixed together as a liquid solution that was directly injected into reactor; 2) in which vaporised precursors were independently injected in the gas phase using Coriolis-based microfluidic mass flow controllers with concentrations monitored in-line using FTIR spectroscopy. Factors favouring highest electrical conductivity fibres include: lower hydrogen flows, lean fuel-to-gas mixtures, higher winding rates, higher argon flows, with many thiophene concentration interactions with other parameters; for highest Raman G:D ratios: leaner fuel-to-gas mixtures, lower thiophene concentrations, higher hydrogen flows, and greater external laboratory pressure; but for yield rate, systematic trends were harder to discern. This study demonstrates the degree of predictability in FC-CVD reactors, quantitatively ranks impact of FC-CVD parameters, and identifies regions of fibre “spinnability” which correspond well with a recent meta-analysis of experimental results in the literature.