Journal ArticleDOI
Continuous Carbon Nanotube Reinforced Composites
TLDR
Under compressive loadings, the nanotube composites can generate more than an order of magnitude improvement in the longitudinal modulus ( up to 3,300%) as well as damping capability (up to 2,100%).Abstract:
Carbon nanotubes are considered short fibers, and polymer composites with nanotube fillers are always analogues of random, short fiber composites. The real structural carbon fiber composites, on the other hand, always contain carbon fiber reinforcements where fibers run continuously through the composite matrix. With the recent optimization in aligned nanotube growth, samples of nanotubes in macroscopic lengths have become available, and this allows the creation of composites that are similar to the continuous fiber composites with individual nanotubes running continuously through the composite body. This allows the proper utilization of the extreme high modulus and strength predicted for nanotubes in structural composites. Here, we fabricate such continuous nanotube polymer composites with continuous nanotube reinforcements and report that under compressive loadings, the nanotube composites can generate more than an order of magnitude improvement in the longitudinal modulus (up to 3300%) as well as dampi...read more
Citations
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Review of thermal conductivity in composites: Mechanisms, parameters and theory
TL;DR: In this paper, theoretical and experimental aspects of thermal conductivity in composites, from thermal energy generation to heat transfers, are reviewed, and the fundamental mechanism of thermal conduction, its mathematical aspects, and certain essential parameters to be considered in this study, such as crystallinity, phonon scattering, or filler/matrix interfaces are discussed in detail.
Journal ArticleDOI
Flexible Nanocomposite Generator Made of BaTiO 3 Nanoparticles and Graphitic Carbons
Kwi-Il Park,Minbaek Lee,Ying Liu,San Moon,Geon-Tae Hwang,Guang Zhu,Ji-Eun Kim,Sang Ouk Kim,Do Kyung Kim,Zhong Lin Wang,Keon Jae Lee +10 more
TL;DR: One way of energy harvesting without such restraints is to utilize piezoelectric materials that can convert vibrational and mechanical energy sources from human activities such as pressure, bending, and stretching motions into electrical energy.
Journal ArticleDOI
Highly stretchable piezoelectric-pyroelectric hybrid nanogenerator.
Ju-Hyuck Lee,Keun Young Lee,Manoj Kumar Gupta,Tae Yun Kim,Dae Yeong Lee,Junho Oh,Changkook Ryu,Won Jong Yoo,Chong Yun Kang,Seok Jin Yoon,Ji-Beom Yoo,Sang-Woo Kim +11 more
TL;DR: A highly stretchable hybrid nanogenerator has been developed using a micro-patterned piezoelectric polymer P(VDF-TrFE), PDMS-CNT composite, and graphene nanosheets that generates very stable piezOElectric and pyroelectric power outputs due to micro- pattern designing.
Journal ArticleDOI
CNT/PDMS Composite Flexible Dry Electrodesfor Long-Term ECG Monitoring
Hachul Jung,Jin-Hee Moon,Dong-Hyun Baek,Jae-Hee Lee,Yoon-Young Choi,Joung Sook Hong,Sang Hoon Lee +6 more
TL;DR: A seven-day continuous wearability test showed that the quality of the ECG signal did not degrade over time, and skin reactions such as itching or erythema were not observed, and the electrode was shown to be biocompatible from the cytotoxicity test.
Journal ArticleDOI
Application and Future Challenges of Functional Nanocarbon Hybrids
TL;DR: This progress report looks at the history of research on nanocarbons (fullerenes, CNTs and graphene) and their composites and hybrids, presents the origin of synergistic effects, reviews the most intriguing results onnanocarbon hybrid performance in heterogeneous catalysis, electrocatalysis, photocatalysis, batteries, supercapacitors, photovoltaics and sensors, and discusses remaining challenges and future research directions.
References
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Journal ArticleDOI
Helical microtubules of graphitic carbon
TL;DR: Iijima et al. as mentioned in this paper reported the preparation of a new type of finite carbon structure consisting of needle-like tubes, which were produced using an arc-discharge evaporation method similar to that used for fullerene synthesis.
Journal ArticleDOI
Carbon Nanotubes--the Route Toward Applications
TL;DR: Many potential applications have been proposed for carbon nanotubes, including conductive and high-strength composites; energy storage and energy conversion devices; sensors; field emission displays and radiation sources; hydrogen storage media; and nanometer-sized semiconductor devices, probes, and interconnects.
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Small but strong: A review of the mechanical properties of carbon nanotube–polymer composites
TL;DR: In this article, a review of the progress to date in the field of mechanical reinforcement of polymers using nanotubes is presented, and the most promising processing methods for mechanical reinforcement are discussed.
Journal ArticleDOI
Multifunctional Carbon Nanotube Yarns by Downsizing an Ancient Technology
TL;DR: By introducing twist during spinning of multiwalled carbon nanotubes from nanotube forests to make multi-ply, torque-stabilized yarns, this work achieves yarn strengths greater than 460 megapascals, nearly as tough as fibers used for bulletproof vests.
Journal ArticleDOI
Load transfer in carbon nanotube epoxy composites
TL;DR: In this paper, the mechanical behavior of multi-walled carbon nanotube/epoxy composites was studied in both tension and compression, and it was found that the compression modulus is higher than the tensile modulus, indicating that load transfer to the nanotubes in the composite is much higher in compression.