Stress relaxation in carbon nanotube-based fibers for load-bearing applications

Zu, Mei; Li, Qingwen; Zhu, Yuntian; Zhu, Yong; Wang, Guojian; Byun, Joon‐Hyung; Chou, Tsu‐Wei

doi:10.1016/j.carbon.2012.09.036

Cited by 26 publications

(17 citation statements)

References 24 publications

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“…[ 14,33,44,57,67,111,117,118 ] Moreover, resistive-type sensors exhibited larger overshooting behavior than capacitive-type sensors. In fact, when the strain is suddenly reserved at the end of the stretching cycle, polymers intend to release their stress instantly by mechanical deformations.…”

Section: Overshoot Behaviormentioning

confidence: 99%

Stretchable, Skin‐Mountable, and Wearable Strain Sensors and Their Potential Applications: A Review

Amjadi

Kyung

Park

et al. 2016

Adv Funct Materials

2,447

2,129

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wileyonlinelibrary.comSkin-mountable and wearable sensors can be attached onto the clothing or even directly mounted on the human skin for the real-time monitoring of human activities. [ 10 ] Besides their high effi ciency, they must fulfi ll several minimum requirements including high stretchability, fl exibility, durability, low power consumption, biocompatibility, and lightweight. These demands become even more severe for epidermal electronic devices where mechanical compliance like human skin and high stretchability ( ε > 100% where ε is the strain) are required. [ 11,12 ] Recently, several types of skin-mountable and wearable sensors have been proposed by using nanomaterials coupled with fl exible and stretchable polymers. Indeed, nanomaterials are utilized as functional sensing elements owing to their outstanding electrical, mechanical, optical, and chemical properties while polymers are employed as fl exible support materials thanks to their fl exibility, stretchability, humanfriendliness, and durability. [ 13 ] Examples of those innovative sensors include strain sensors, [ 10,[12][13][14] pressure sensors, [ 5,[15][16][17] electronic skins (e-skins), [ 3,[16][17][18][19][20] and temperature sensors. [ 2,21,22 ] Particularly, various skin-mountable and wearable strain sensors have been developed because of their broad applications in personalized heath-monitoring, human motion detection, human-machine interfaces, and soft robotics. [ 10,12,[23][24][25][26][27][28][29][30][31] This paper aims to survey fabrication processes, working mechanisms, strain sensing performances, and applications of stretchable strain sensors. The article is organized as follows: fi rst, common operation mechanisms of stretchable strain sensors are described. Here, we summarize novel functional nanomaterials and techniques for the fabrication of stretchable strain sensors in details. Second, mechanisms involved in the strain-responsive behavior of resistive-type and capacitive-type sensors are explained. We show that the infl uence of traditional mechanisms like geometrical changes and piezoresistivity of materials on the strain sensing performance of fl exible strain sensors are very small whereas mechanisms such as disconnection between sensing elements, crack propagation in thin fi lms, and tunneling effect can potentially be employed for highly stretchable and sensitive strain sensing. Third, we emphasize the performance parameters of stretchable strain sensors in terms of stretchability, sensitivity, linearity, hysteresis behavior, response time, overshooting, and durability. We demonstrate

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Section: Overshoot Behaviormentioning

confidence: 99%

Stretchable, Skin‐Mountable, and Wearable Strain Sensors and Their Potential Applications: A Review

Amjadi

Kyung

Park

et al. 2016

Adv Funct Materials

2,447

2,129

View full text Add to dashboard Cite

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“…Zu et al [40] have studied the tensile stress relaxation behavior of a pure carbon nanotube (CNT) fiber and a CNT/epoxy composite fiber and shown that a weak van der Waals force among CNTs limits their mechanical interlocking and friction force and slippage among CNT bundles occurs within the fiber. In addition to the CNT interbundle sliding, CNT/epoxy interfacial sliding facilitates load decay during the relaxation process for a CNT/epoxy fiber.…”

Section: Stress Relaxation and Molecular Orientation Of Electrospun Fmentioning

confidence: 99%

Aligned poly(ε-caprolactone)/graphene oxide and reduced graphene oxide nanocomposite nanofibers: Morphological, mechanical and structural properties

Ramazani

Karimi

2015

Materials Science and Engineering: C

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“…For a two‐ply CNT yarn, the stress relaxed no more than 15%, when it was held for 20 h at 6% strain, and the majority of the stress relaxation occurred within the first 20 min . For a pure CNT fiber, there was significant load decay during the first 4 min of the relaxation process, and the load dropped by ≈32% after 18 h at constant strain . The CNT/epoxy composite fiber showed the similar relaxation behavior, while the load of the carbon fiber was almost constant after 1 h and decreased by only 5.4% even after 18 h (Figure a).…”

Section: Vibration Damping In Carbon Nanotube Assembliesmentioning

confidence: 94%

“…For CNT fibers and multi‐plied CNT yarns, the creep, creep recovery, and stress relaxation behaviors are also of great interests . For a two‐ply CNT yarn, the stress relaxed no more than 15%, when it was held for 20 h at 6% strain, and the majority of the stress relaxation occurred within the first 20 min .…”

Section: Vibration Damping In Carbon Nanotube Assembliesmentioning

confidence: 99%

Vibration Damping of Carbon Nanotube Assembly Materials

et al. 2017

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Vibration reduction is of great importance in various engineering applications, and a material that exhibits good vibration damping along with high strength and modulus has become more and more vital. Owing to the superior mechanical property of carbon nanotube (CNT), new types of vibration damping material can be developed. This paper presents recent advancements, including our progresses, in the development of highdamping macroscopic CNT assembly materials, such as forests, gels, films, and fibers. In these assemblies, structural deformation of CNTs, zipping and unzipping at CNT connection nodes, strengthening and welding of the nodes, and sliding between CNTs or CNT bundles are playing important roles in determining the viscoelasticity, and elasticity as well. Towards the damping enhancement, strategies for micro-structure and interface design are also discussed.

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Stress relaxation in carbon nanotube-based fibers for load-bearing applications

Cited by 26 publications

References 24 publications

Stretchable, Skin‐Mountable, and Wearable Strain Sensors and Their Potential Applications: A Review

Stretchable, Skin‐Mountable, and Wearable Strain Sensors and Their Potential Applications: A Review

Aligned poly(ε-caprolactone)/graphene oxide and reduced graphene oxide nanocomposite nanofibers: Morphological, mechanical and structural properties

Vibration Damping of Carbon Nanotube Assembly Materials

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