Effect of twist on the electromechanical properties of carbon nanotube yarns

Anike, Jude C.; Belay, Kalayu; Abot, Jandro L.

doi:10.1016/j.carbon.2018.10.067

Cited by 57 publications

(48 citation statements)

References 34 publications

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“… Yarn with different twist angles: ( a ) 15°; ( b ) 30°; and ( c ) 45°. Source: Figure reproduced with copyright permission from Anike et al [ 106 ]. …”

Section: Figurementioning

confidence: 99%

A Comprehensive Review on Advanced Sustainable Woven Natural Fibre Polymer Composites

et al. 2021

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Over the last decade, the progressive application of natural fibres in polymer composites has had a major effect in alleviating environmental impacts. Recently, there is a growing interest in the development of green materials in a woven form by utilising natural fibres from lignocellulosic materials for many applications such as structural, non-structural composites, household utilities, automobile parts, aerospace components, flooring, and ballistic materials. Woven materials are one of the most promising materials for substituting or hybridising with synthetic polymeric materials in the production of natural fibre polymer composites (NFPCs). These woven materials are flexible, able to be tailored to the specific needs and have better mechanical properties due to their weaving structures. Seeing that the potential advantages of woven materials in the fabrication of NFPC, this paper presents a detailed review of studies related to woven materials. A variety of factors that influence the properties of the resultant woven NFRC such as yarn characteristics, fabric properties as well as manufacturing parameters were discussed. Past and current research efforts on the development of woven NFPCs from various polymer matrices including polypropylene, polylactic acid, epoxy and polyester and the properties of the resultant composites were also compiled. Last but not least, the applications, challenges, and prospects in the field also were highlighted.

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“… Yarn with different twist angles: ( a ) 15°; ( b ) 30°; and ( c ) 45°. Source: Figure reproduced with copyright permission from Anike et al [ 106 ]. …”

Section: Figurementioning

confidence: 99%

A Comprehensive Review on Advanced Sustainable Woven Natural Fibre Polymer Composites

et al. 2021

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“…The porosity was estimated in refs. [9,29] as the volumetric density of the yarn and that of the constituent CNTs, being the last one calculated from a suitable model. For the fabrication of single-fiber (monofilament) composites, a commercial (Ashland Composites, Covington, USA) Derakane 470-300 vinyl ester resin (VER) was used.…”

Section: Experimental Section 21 Materialsmentioning

confidence: 99%

Cyclic Thermoresistivity of Freestanding and Polymer Embedded Carbon Nanotube Yarns

et al. 2020

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Carbon nanotube yarns (CNTYs) are hierarchical fibers with outstanding electrical properties, and understating the temperature‐dependence of their electrical resistance (thermoresistivity) is essential for sensing applications and development of self‐sensing polymer composites. The cyclic thermoresistive response of individual CNTYs and the effect of embedding the yarn into a polymer are experimentally investigated herein. The effect of confining the CNTY by a thermosetting polymer is addressed by studying the thermoresistive response of CNTY/vinyl ester single‐fiber composites. Heating–cooling cycles ranging from 25 (room temperature [RT]) to 100 °C and 25 to −30 °C are applied to individual CNTYs and to CNTYs embedded into a vinyl ester polymer, while their electrical resistance is simultaneously recorded. Both the CNTY and its single‐fiber composite show a negative dependence of electrical resistance with temperature. For both temperature ranges (above and below RT), the average temperature coefficient of resistance found for individual CNTYs is ≈−9.5 × 10−4 K−1, and its magnitude decreases about ≈30% when the yarn is embedded into the vinyl ester polymer. The hysteresis rendered by the different heating and cooling pathways is small for individual CNTYs, and largely increases when the CNTY is embedded into the polymer.

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“…The CNTY was pre-stretched by hanging a constant weight of 0.712 mg mass from the end of the CNTY, which was equivalent to a 0.698 mN force. Assuming a solid CNTY cross section of 8.45 × 10 −10 m 2 , this corresponds to a pre-stress of 826 kPa, which is ~1.6% of the yarn strength, according to the strength reported for tensile tested as-spun CNTYs with twist angle ranging from 10° to 25° [ 28 ]. Four AWG 426-DFV copper wire electrodes (Vishay MicroMeasurements, Wendell, NC, USA) were inserted spaced as shown in Figure 2 , centered within the length and at the mid-depth of the silicon mold, spanning its width and overhanging at the other end of the mold.…”

Section: Methodsmentioning

confidence: 99%

“…One of the key aspects of this electrical sensitivity, which controls the response of the yarn, is its porosity. CNTYs are highly porous materials, with typical porosities ranging from 40% to 90% [ 26 , 27 , 28 ]. This high porosity allows infiltration of moisture, liquids, and chemical species, which in turn changes the internal morphology and microstructure of the yarn, changing its electrical conductivity [ 3 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Polymer Viscosity and Polymerization Kinetics on the Electrical Response of Carbon Nanotube Yarn/Vinyl Ester Monofilament Composites

et al. 2021

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The effect of polymerization kinetics and resin viscosity on the electrical response of a single carbon nanotube yarn (CNTY) embedded in a vinyl ester resin (VER) during polymerization was investigated. To analyze the effect of the polymerization kinetics, the concentration of initiator (methyl ethyl ketone peroxide) was varied at three levels, 0.6, 0.9, and 1.2 wt.%. Styrene monomer was added to VER, to reduce the polymer viscosity and to determine its effect on the electrical response of the CNTY upon resin wetting and infiltration. Upon wetting and wicking of the CNTY by VER, a transient decrease in the CNTY electrical resistance (ca. −8%) was observed for all initiator concentrations. For longer times, this initial decrease in electrical resistance may become a monotonic decrease (up to ca. −17%) or change its trend, depending on the initiator concentration. A higher concentration of initiator showed faster and more negative electrical resistance changes, which correlate with faster gel times and higher build-up of residual stresses. An increase in styrene monomer concentration (reduced viscosity) resulted in an upward shift of the electrical resistance to less negative values. Several mechanisms, including wetting, wicking, infiltration, electronic transfer, and shrinkage, are attributed to the complex electrical response of the CNTY upon resin wetting and infiltration.

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Effect of twist on the electromechanical properties of carbon nanotube yarns

Cited by 57 publications

References 34 publications

A Comprehensive Review on Advanced Sustainable Woven Natural Fibre Polymer Composites

A Comprehensive Review on Advanced Sustainable Woven Natural Fibre Polymer Composites

Cyclic Thermoresistivity of Freestanding and Polymer Embedded Carbon Nanotube Yarns

Effect of Polymer Viscosity and Polymerization Kinetics on the Electrical Response of Carbon Nanotube Yarn/Vinyl Ester Monofilament Composites

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