Super-strong CNT composite yarn with tight CNT packing <i>via</i> a compress-stretch process

Wei, Xiaoxiao; Wang, Jilong; Ma, Huan; Farha, Farial Islam; Bi, Siyi; Qin, Zhang; Xu, Fujun

doi:10.1039/d2nr00874b

Cited by 12 publications

(9 citation statements)

References 37 publications

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“…These observations justified the efficacy of the wet-compression technique compared to the dry-compression one, verifying the structural changes of the twisted CNT yarn after dry compression, but having no damages rather an improved densified structure after wet compression (Figure ac2). A similar pattern of Raman spectra was obtained for the structural changes of the CNT yarn after the compression process by our previous research approach …”

Section: Resultssupporting

confidence: 81%

“…A similar pattern of Raman spectra was obtained for the structural changes of the CNT yarn after the compression process by our previous research approach. 43 Acetone with proper surface affinity 44,45 by means of low viscosity (0.32 MPa•s), high volatility (boiling point 56.1 °C), 0.355 relative polarity, lower contact angle (9.1°), and good established Hansen affinity parameter (6.23 Mpa 1/2 , the lower value indicates better association with CNTs) is easy to penetrate the CNTs and plays an important role as a lubricant that reduces the interactions between the neighboring CNTs due to its low surface tension (23.3 mN/m). 32 Therefore, under the external compression, the CNTs were much easier to be rearranged and densified than pristine as well as drycompressed CNT yarn.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Microstructural Tuning of Twisted Carbon Nanotube Yarns through the Wet-Compression Process: Implications for Multifunctional Textiles

Farha

Wei

Qin

et al. 2022

ACS Appl. Nano Mater.

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Light-weight and multifunctional carbon nanotube (CNT) yarn possessing outstanding mechanical properties as individual CNTs is highly desirable in the field of smart textiles as well as multifunctional composites, yet remains exceptionally challenging to be obtained because of the loose packing of CNTs within the carbon nanotube assemblies resulting in a low density and weak interaction between the individual CNTs. Herein, we utilized a simple but effective technique to densify CNT yarn by compression using acetone (wet compression) to attain high mechanical properties along with extraordinary Joule heating presentation. Owing to having a low surface tension, acetone is easy to be penetrated into the CNT fibers and acts as a lubricant decreasing the interactions between the neighboring CNTs under load. Therefore, the CNT yarn was condensed in density from 0.211 to 0.465 gm/cm 3 (120% increment) with the diameter of 175 ± 5 μm. Subsequently, the tensile strength, modulus, electrical conductivity, and gauge factor of wet-compressed CNT yarn were amplified by 185, 887.5, 105, and 305%, respectively, along with a proper reliability and stability for sensing performance. The as-produced CNT yarn reached a brilliant electrothermal stability (∼2.5 min) at the steady-state temperature of 275 °C only within 15 s, even under various deformations (bending and knotting). The outstanding strength with the controlled diameter and admirable Joule heating performance of wet-compressed CNT yarn is aimed for multifunctional uses, including but not limited to wearable electronics, smart textiles, and therapy devices, as well as for incorporation in fabric heaters.

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Section: Resultssupporting

confidence: 81%

Section: ■ Results and Discussionmentioning

confidence: 99%

Microstructural Tuning of Twisted Carbon Nanotube Yarns through the Wet-Compression Process: Implications for Multifunctional Textiles

Farha

Wei

Qin

et al. 2022

ACS Appl. Nano Mater.

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“…First, it promoted a pultrusion force to densify the CNT bundles and more PVA was squeezed into the CNT bundles simultaneously. Second, it initiated a drawing force to align the CNT bundles, which could be verified by the decreased helical angle of pultruded CNT composite yarn (Figure e). The two effects were convinced to facilitate the load transfer efficiency which demonstrated superiority in tensile responses for P-CNTY-WC.…”

Section: Resultsmentioning

confidence: 86%

Carbon Nanotube Composites Manufactured by Filament Wind Processing for Electrothermal Deicing Application

Liu

Zhou

et al. 2023

ACS Appl. Nano Mater.

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Carbon nanotube (CNT) composites are proven to be versatile tools in many fields by virtue of the multifunctional response. However, the severe challenge in mass production of CNT-based composites has become a bottleneck in both the science and engineering. To tackle the issues, herein, we reported an effective approach toward preparing densified and highly orientated CNT yarn/PVA (polyvinyl alcohol) composites via pultrusion and filament wind processing. In this processing, CNT yarn with a diameter of 150 μm, produced by twisting the CNT film directly, was dipped into PVA polymer solution and then continuously winded on a mandrel after squeezed by a pultrusion mold with a diameter of 120 μm. As a result, the pultruded CNT yarn/PVA winding composites (named as P-CNTY-WC), with the densified and aligned CNT yarn showed a considerable tensile strength (708.38 MPa). Furthermore, its toughness was 109.92 MJ m–3, much higher than those of the reported high-performance fiber reinforced composites. Additionally, the P-CNTY-WC possessed high electrical conductivity (207 S cm–1) and thus exhibited a rapid electrothermal performance (reached to 221 °C at 1.5 V within 30 s). In view of the high electrical performances, the electrothermal deicing application in the aircraft wing was demonstrated. Thereby, the facile way and attractive properties could provide insights into massive production of high-performance structural composites with multifunctional applications.

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“…There are various approaches to preparing micro/nanofibers, such as stretching method, microphase separation, solution method, spin-coating method, and electrospinning process. [58][59][60][61] In the case of ion-gel fibrous membrane, the most commonly used methods are spin-coating and electrospinning. Although the spin-coating method is simple to operate, the formed film is poorly uniform and generally has some morphological defects.…”

Section: Introductionmentioning

confidence: 99%

Versatile Ion‐Gel Fibrous Membrane for Energy‐Harvesting Iontronic Skin

Liu

Zhao

Xiong

et al. 2023

Adv Funct Materials

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Developing versatile and high sensitivity sensors is beneficial for promoting flexible electronic devices and human‐machine interactive systems. Researchers are working on the exploration of various active sensing materials toward broad detection, multifunction, and low‐power consumption. Here, a versatile ion‐gel fibrous membrane is presented by electrospinning technology and utilized to construct capacitive sensors and triboelectric nanogenerator (TENG). The iontronic capacitive sensor exhibits inherently favorable sensitivity and repeatability, which retains long‐term stability after 5000 cycles. The capacitive sensor can also detect a clear pulse waveform at the human wrist and enable the mapping of pressure distribution by a capacitive sensory matrix. For the iontronic TENG, the maximum peak power is 54.56 µW and can be used to power commercial electronics. In addition, the prepared iontronic TENG array can achieve interactive, rapidly responsive, and accurate dynamic monitoring, which broadens the exploration to direct and effective sensory devices. The versatile ion‐gel fibrous membrane is promising to provide an outstanding approach for physiological detection, biomechanical energy harvesting, human‐machine interaction, and self‐powered monitoring systems.

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Super-strong CNT composite yarn with tight CNT packing via a compress-stretch process

Abstract: Carbon nanotube yarn (CNTY) with large size and excellent mechanical property would have wider technological influences for fields ranging from electrical devices to wearable textiles; however, inventing such CNTY has...

Cited by 12 publications

References 37 publications

Microstructural Tuning of Twisted Carbon Nanotube Yarns through the Wet-Compression Process: Implications for Multifunctional Textiles

Microstructural Tuning of Twisted Carbon Nanotube Yarns through the Wet-Compression Process: Implications for Multifunctional Textiles

Carbon Nanotube Composites Manufactured by Filament Wind Processing for Electrothermal Deicing Application

Versatile Ion‐Gel Fibrous Membrane for Energy‐Harvesting Iontronic Skin

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