Highly Oriented Direct-Spun Carbon Nanotube Textiles Aligned by In Situ Radio-Frequency Fields.
Highly Oriented Direct-Spun Carbon Nanotube Textiles Aligned by In Situ Radio-Frequency Fields.
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DOI：
10.1021/acsnano.2c02875
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发表时间：
2022-06-28
期刊：
影响因子：
17.1
通讯作者：
Boies, Adam
中科院分区：
文献类型：
--
作者：
Issman, Liron;Kloza, Philipp A.;Portas, Jeronimo Terrones;Collins, Brian;Pendashteh, Afshin;Pick, Martin;Vilatela, Juan J.;Elliott, James A.;Boies, Adam
碳纳米管 (CNT) 单独表现出卓越的物理性能，超越了最先进的散装材料，但在商业上主要用作添加剂，而不是作为独立的宏观产品。块状碳纳米管材料的使用受到限制，是因为无法将单个碳纳米管的卓越纳米级特性转化为宏观材料。事实证明，纺织品中的碳纳米管排列是缩小这一差距的关键因素。在这里，我们报告了一种基于浮动催化剂化学气相沉积工艺的改进的直接碳纳米管纺丝方法的开发，该方法直接与气相中碳纳米管束的自组装相互作用。该装置旨在应用交流电场，在碳纳米管束和随后的气凝胶形成过程中连续原位排列碳纳米管。为模拟对准过程而开发的中尺度碳纳米管模型揭示了需要使用基于洛伦兹力引起的碳纳米管硬化效应（z 收缩）的交流场而不是直流场。 AC 排列合成提供了一种控制 CNT 束直径的方法，其直径从 16 nm 扩大到 25 nm。热重分析和拉曼光谱分别验证了所得的块状 CNT 纺织品在不改变 CNT 数量或质量的情况下，其特定电性能和拉伸性能有所提高（分别高达 90% 和 460%）。增强的性能与纺织品内 CNT 排列的程度相关，通过小角 X 射线散射和扫描电子显微镜图像分析进行量化。在 0.5–1 kV cm–1 范围内的外加场强度和 13.56 MHz 频率下，相对于原始材料（取向序参数 = 0.19），实现了清晰的对准（取向序参数 = 0.5）。
Carbon nanotubes (CNTs) individually exhibit exceptional physical properties, surpassing state-of-the-art bulk materials, but are used commercially primarily as additives rather than as a standalone macroscopic product. This limited use of bulk CNT materials results from the inability to harness the superb nanoscale properties of individual CNTs into macroscopic materials. CNT alignment within a textile has been proven as a critical contributor to narrow this gap. Here, we report the development of an altered direct CNT spinning method based on the floating catalyst chemical vapor deposition process, which directly interacts with the self-assembly of the CNT bundles in the gas phase. The setup is designed to apply an AC electric field to continuously align the CNTs in situ during the formation of CNT bundles and subsequent aerogel. A mesoscale CNT model developed to simulate the alignment process has shed light on the need to employ AC rather than DC fields based on a CNT stiffening effect (z-pinch) induced by a Lorentz force. The AC-aligned synthesis enables a means to control CNT bundle diameters, which broadened from 16 to 25 nm. The resulting bulk CNT textiles demonstrated an increase in the specific electrical and tensile properties (up to 90 and 460%, respectively) without modifying the quantity or quality of the CNTs, as verified by thermogravimetric analysis and Raman spectroscopy, respectively. The enhanced properties were correlated to the degree of CNT alignment within the textile as quantified by small-angle X-ray scattering and scanning electron microscopy image analysis. Clear alignment (orientational order parameter = 0.5) was achieved relative to the pristine material (orientational order parameter = 0.19) at applied field intensities in the range of 0.5–1 kV cm–1 at a frequency of 13.56 MHz.
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DOI：
10.3390/nano3030393
发表时间：
2013-07-17
期刊：
Nanomaterials (Basel, Switzerland)
影响因子：
--
作者：
Bocharov GS;Eletskii AV
通讯作者：
Eletskii AV
影响因子：
13.3
作者：
Boies, Adam M.;Hoecker, Christian;Smail, Fiona
通讯作者：
Smail, Fiona
影响因子：
17.1
作者：
Bornhoeft, Lindsey R.;Castillo, Aida C.;Cherukuri, Paul
通讯作者：
Cherukuri, Paul
DOI：
10.1002/advs.202003142
发表时间：
2021-03
期刊：
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
影响因子：
--
作者：
Hyon J;Lawal O;Thevamaran R;Song YE;Thomas EL
通讯作者：
Thomas EL
影响因子：
2.4
作者：
Burke, PJ
通讯作者：
Burke, PJ