Hierarchical structure control in solution spinning for strong and multifunctional carbon nanotube fibers

Kim, Seo Gyun; Choi, Gyeong Min; Jeong, Hyo Jin; Lee, Dongju; Kim, Sungyong; Ryu, Ki‐Hyun; Lee, Suhun; Kim, Jungwon; Hwang, Jun Yeon; Kim, Nam Dong; Kim, Dae‐Yoon; Lee, Heon Sang; Ku, Bon‐Cheol

doi:10.1016/j.carbon.2022.04.040

Cited by 46 publications

(39 citation statements)

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“…Alignment, which is a critical factor in fiber properties, can be achieved by flow fields such as shear flow along the side wall in the nozzle and extensional flow by drawing (Figure 1c,d). [ 12,42 ] Extensional flow is more effective than shear flow for particle alignment. [ 12,43,44 ] In our previous study, it was found that extensional deformation by drawing in the spinning process is the dominant process for the orientation of CNT fibers.…”

Section: Resultsmentioning

confidence: 99%

“…LC solutions play a significant role in the alignment and dense packing of fiber elements during the spinning process. [ 3,11,12 ] In practice, wet‐spun CNT fibers formed using a CSA have excellent macroscopic properties. [ 11,12,15,22 ] However, the properties of the CNT fibers are highly dependent on the length (aspect ratio) of synthesized CNTs.…”

Section: Introductionmentioning

confidence: 99%

“…[ 3,11,12 ] In practice, wet‐spun CNT fibers formed using a CSA have excellent macroscopic properties. [ 11,12,15,22 ] However, the properties of the CNT fibers are highly dependent on the length (aspect ratio) of synthesized CNTs. [ 22–24 ] Therefore, a combination of multidimensional structures can be considered to improve the properties of structural assemblies in restricted synthetic CNTs.…”

Section: Introductionmentioning

confidence: 99%

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Ultrastrong Hybrid Fibers with Tunable Macromolecular Interfaces of Graphene Oxide and Carbon Nanotube for Multifunctional Applications

et al. 2022

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Individual carbon nanotubes (CNT) and graphene have unique mechanical and electrical properties; however, the properties of their macroscopic assemblies have not met expectations because of limited physical dimensions, the limited degree of dispersion of the components, and various structural defects. Here, a state‐of‐the‐art assembly for a novel type of hybrid fiber possessing the properties required for a wide variety of multifunctional applications is presented. A simple and effective multidimensional nanostructure of CNT and graphene oxide (GO) assembled by solution processing improves the interfacial utilization of the components. Flexible GOs are effectively intercalated between nanotubes along the shape of CNTs, which reduces voids, enhances orientation, and maximizes the contact between elements. The microstructure is finely controlled by the elements content ratio and dimensions, and an optimal balance improves the mechanical properties. The hybrid fibers simultaneously exhibit exceptional strength (6.05 GPa), modulus (422 GPa), toughness (76.8 J g–1), electrical conductivity (8.43 MS m–1), and knot strength efficiency (92%). Furthermore, surface and electrochemical properties are significantly improved by tuning the GO content, further expanding the scope of applications. These hybrid fibers are expected to offer a strategy for overcoming the limitations of existing fibers in meeting the requirements for applications in the fiber industry.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultrastrong Hybrid Fibers with Tunable Macromolecular Interfaces of Graphene Oxide and Carbon Nanotube for Multifunctional Applications

et al. 2022

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“…Wet spinning is a strong candidate for achieving exceptional mechanical and electrical properties of carbon nanotubes (CNTs) on a macroscopic scale. − The extensional rheology of the liquid crystalline (LC) phase of CNTs is important to obtain the desired properties of the CNT fiber. CNTs form an LC state above a critical concentration in strong acids, such as sulfonic and chlorosulfonic acid (CSA). − , The orientational shear viscosities of the LC phases of CNTs and graphene oxides (GOs) are analogous to those of polydomain LCs. , However, there is a clear difference between LC nanocarbons and pure LCs in terms of elasticity. ,, For pure LCs, the wide orientation spread of the directors during flow narrows in the equilibrium state with the help of Frank elasticity at a particular shear rate range. − In the LC phases of CNTs and GOs, an elastic force acts in the direction opposite the Frank elastic force in the extensional flow (Figure ). ,, For an LC CNT dope, this elastic force occurs when a force is applied to straighten the insignificant waviness of long CNTs (Figure ).…”

Section: Introductionmentioning

confidence: 99%

“…CNTs form an LC state above a critical concentration in strong acids, such as sulfonic and chlorosulfonic acid (CSA). [1][2][3]9 The orientational shear viscosities of the LC phases of CNTs and graphene oxides (GOs) are analogous to those of polydomain LCs. 9,10 However, there is a clear difference between LC nanocarbons and pure LCs in terms of elasticity.…”

Section: Introductionmentioning

confidence: 99%

Excluded Volume Effect on the Extensional Rheology of Carbon Nanotubes: A Mesoscopic Theory

Choi

Lee

2022

Macromolecules

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We present a mesoscopic theory of the extensional rheology of liquid crystalline carbon nanotubes (CNTs). We implement the mesoscopic Leslie−Ericksen theory, considering the repulsive excluded volume potential acting in the direction opposite to the Frank elastic potential. Given the volume fraction, diameter, and length of the CNTs, our model predicts the extensional viscosity. The liquid crystalline phase of the CNTs exhibited extensional thinning behavior. In our theory, the rotational relaxation time is proportional to the reciprocal excluded volume, particularly for long CNTs with waviness. Our model also predicts the minimum draw ratio, below which the nanotube orientation cannot reach the target orientation. The existence of a minimum draw ratio is due to the large excluded volume potential of the long CNTs. Article pubs.acs.org/Macromolecules

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Multifunctional Fiber for Synchronous Bio‐Sensing and Power Supply in Sweat Environment

Tong

Yang

Hua

et al. 2023

Adv Funct Materials

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Continuous monitoring of human sweat, which enables highly sensitive multiple biomarkers analysis with a portable power supply, is increasingly desired for the remote healthcare industry. Smart fibers with on‐demand functionality are ideal candidates for fabricating noninvasive and conformal bioelectronic devices owing to their considerable flexibility. Herein, a multifunctional textile patch based on a reduced graphene oxide (rGO)/tetra‐aniline (TANi) fiber for simultaneous biomarker monitoring and energy supply is reported. Benefiting from the multi‐electrochemical redox states and proton doping/dedoping characteristics of TANi, rGO/TANi hybrid fibers are combined into an energy storage device and biosensor in a physiological environment. GO flakes increase the viscoelasticity of the wet‐spinning dope by regulating the noncovalent interactions between TANi aggregates, thereby enhancing the mechanical strength and conductivity of the resulting rGO/TANi hybrid fiber. Consequently, the hybrid fiber exhibits high volumetric capacitance and versatile sensing capability for various physiological analytes, e.g., pH, K+, and glucose in sweat electrolyte. Furthermore, a wireless continuous sweat monitoring system is constructed by integrating the multifunctional fiber sensor into a printed electric circuit board with programmed functionality. Such a delicate integrated design that harnesses the signal collection and communication units is anticipated to facilitate practical applications in personalized diagnostic and physiological health.

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Hierarchical structure control in solution spinning for strong and multifunctional carbon nanotube fibers

Cited by 46 publications

References 46 publications

Ultrastrong Hybrid Fibers with Tunable Macromolecular Interfaces of Graphene Oxide and Carbon Nanotube for Multifunctional Applications

Ultrastrong Hybrid Fibers with Tunable Macromolecular Interfaces of Graphene Oxide and Carbon Nanotube for Multifunctional Applications

Excluded Volume Effect on the Extensional Rheology of Carbon Nanotubes: A Mesoscopic Theory

Multifunctional Fiber for Synchronous Bio‐Sensing and Power Supply in Sweat Environment

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