Understanding the influence of single-walled carbon nanotube dispersion states on the microstructure and mechanical properties of wet-spun fibers

Jiang, Xinrong; Gong, Wenbin; Qu, Shuxuan; Wang, Danrui; Liu, Tong; Li, Qingwen; Zhou, Gengheng; Lu, Weibang

doi:10.1016/j.carbon.2020.05.080

Cited by 30 publications

(7 citation statements)

References 44 publications

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“…A specific electrical conductivity over 4,859 S m 2 kg −1 was achieved with 90% CNT content in the composite fiber. The increased electrical conductivity of the PA/CNT fibers can be attributed to the continuous electrical conducting pathway along the uniaxially oriented CNT domains in PA matrices [26]. Since the PA/CNT (10/90) fiber had the highest value of tensile strength and electrical conductivity compared to the other composite fibers that were tested, we focused on the PA/CNT (10/90) solution to determine the most effective macroscopic properties.…”

Section: Resultsmentioning

confidence: 99%

Boost Up the Mechanical and Electrical Property of CNT Fibers by Governing Lyotropic Liquid Crystalline Mesophases with Aramid Polymers for Robust Lightweight Wiring Applications

et al. 2022

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Monofilament type of polyaromatic amide (PA) and carbon nanotube (CNT) composite fibers is presented. A concept of a lyotropic liquid crystal (LLC) constructed via a spontaneous self-assembly is introduced to mitigate the extremely low compatibility between PA and CNT. These approaches provide an effective co-processing route of PA and CNT simultaneously to fabricate the uniform, continuous, and reliable composite fibers through a wet-spinning. Interestingly, the addition of a small amount PA into the dope solution of CNT governs the LLC mesophase not only in a spinneret stage but also in a coagulant region. Thus, the developed PA/CNT composite fibers have the high uniaxial orientational order and the close interfacial packing compared to the pure CNT fibers. The PA/CNT composite fibers achieve the outstanding tensile strength, electrical conductivity, and electrochemical response, while maintaining a lightweight. They also exhibit the chemical, mechanical, and thermal robustness. All of these advantages can make flexible, sewable, and washable PA/CNT composite fibers ideal nanocomposite materials for use in next-generation information and energy transporting system by replacing conventional metal electrical conductors. Graphical Abstract The lyotropic liquid crystal self-assembly governed by doping the aramid polymers shows the ability to construct mechanically strong and continuous carbon nanotube-based composite fibers that can be used in the lightweight and robust electrical wiring for extreme environmental applications.

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Section: Resultsmentioning

confidence: 99%

Boost Up the Mechanical and Electrical Property of CNT Fibers by Governing Lyotropic Liquid Crystalline Mesophases with Aramid Polymers for Robust Lightweight Wiring Applications

et al. 2022

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“…In the solution processing of carbon nanotubes (CNTs), their dispersion has long been a challenge. To disperse CNTs individually, various strategies, such as surfactant-assisted CNT dispersion [ 1 , 2 ], using the organic solvent [ 3 ], and the covalent functionalization of CNTs [ 4 ], have been tried so far, combined with physical treatments, for instance, ultrasonication [ 5 ] and the high-pressure jet homogenizer [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, at low concentrations, we can check if liquid crystalline phases are formed, which is beneficial for the solution processing. Here, the low concentration range indicates the typical concentration range used in the solution processing and optical microscopy analysis, which is under about 1 wt.% [ 1 , 6 , 16 , 17 ]. The local alignment preexisting in the liquid crystalline CNTs can be inherited to the final material, maximizing the final alignment [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dispersion of Carbon Nanotubes in m-Cresol

Lee

2022

Materials

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We analyzed the dispersion state of carbon nanotubes (CNTs) in m−cresol using dispersion stability analysis, optical microscopy, and UV−vis spectroscopy. The high dispersion stability of CNT/m−cresol dispersion was observed when it was sufficiently treated with ultrasonication. Despite the high dispersion stability, optical microscopy and UV−vis spectroscopy analysis of various CNT/m−cresol dispersions revealed that CNT bundles in m−cresol were not dispersed into individual CNTs. We also propose that the blue-shift of the G peak of CNTs in m−cresol in the Raman spectrum, which had been reported as evidence of the formation of the charge−transfer complex between m−cresol and CNTs, is rather attributed to the interference of m−cresol’s inherent peak at around 1600 cm−1.

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“…Therefore, great efforts are invested in achieving the proper dispersion of SWCNT on an industrial scale. The quality assessment of such efforts includes methods of characterizing stability and dispersibility in liquid media such as electron microscopy [10,11], UV-Vis and NIR spectroscopies [9,[12][13][14][15], rheology [16][17][18], and Raman spectroscopy [19]. UV-Vis-NIR absorbance spectroscopy can be used both as an indicator for dispersion quality and as a quantitative method to estimate the SWCNT concentration in the solution [13,20].…”

Section: Introductionmentioning

confidence: 99%

Development of Quality Control Methods for Dispersibility and Stability of Single-Wall Carbon Nanotubes in an Aqueous Medium

Basat

Lachman

2021

Nanomaterials

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The attractive properties of single-wall carbon nanotubes (SWCNT) such as mechanical strength and high electrical and thermal conductivity are often undercut by their agglomeration and re-agglomeration tendencies. As a result, the application of SWCNT as additives in advanced composite materials remain far from their potential, with proper dispersion being the major inhibitor. This work presents a dispersion quality control approach for water-based SWCNT dispersions (dispersed by a unique combination of physical and chemical methods), using complementary and easily scalable, characterization methods. UV-Vis spectroscopy, rheological measurements, and precipitant sheet resistance were used to understand the properties of the initial solution through processing and application. From an industrial perspective, these methods are fast and easy to measure while giving a repetitive and quick indication of dispersion quality and stability. The methods were correlated with microscopy and Raman spectroscopy to validate dispersion and SWCNT quality under various dispersing energies. The protocol was then applied to estimate the stability of SWCNT solutions, as well as the effectiveness of different surfactants in aiding dispersion. The simple, fast, and scalable combination of different characterizations provides good SWCNT dispersion and can be used as a quality control system for industrial production and usage.

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Understanding the influence of single-walled carbon nanotube dispersion states on the microstructure and mechanical properties of wet-spun fibers

Cited by 30 publications

References 44 publications

Boost Up the Mechanical and Electrical Property of CNT Fibers by Governing Lyotropic Liquid Crystalline Mesophases with Aramid Polymers for Robust Lightweight Wiring Applications

Boost Up the Mechanical and Electrical Property of CNT Fibers by Governing Lyotropic Liquid Crystalline Mesophases with Aramid Polymers for Robust Lightweight Wiring Applications

Analysis of Dispersion of Carbon Nanotubes in m-Cresol

Development of Quality Control Methods for Dispersibility and Stability of Single-Wall Carbon Nanotubes in an Aqueous Medium

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