Synergistic effect of functionalized graphene oxide and carbon nanotube hybrids on mechanical properties of epoxy composites

Qi, Zehao; Tan, Yaohua; Zhang, Zhongwei; Gao, Li; Zhang, Cuiping; Jin, Tian

doi:10.1039/c8ra08312f

Cited by 57 publications

(21 citation statements)

References 73 publications

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“…On the other hand, CNTs, as one dimensional material, exhibited significant fiber properties [46]. In this case, the CNTs were pulled out of the matrix during the tensile fracture of the composite scaffolds, thereby consuming a large amount of external energy [47]. As shown in Figure 7(b), some CNTs pulled out from the matrix, whose direction tended to align with the direction of the applied load.…”

Section: Discussionmentioning

confidence: 99%

Crystallinity and Reinforcement in Poly-L-Lactic Acid Scaffold Induced by Carbon Nanotubes

Wang

Yang

et al. 2019

Advances in Polymer Technology

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Poly-L-Lactic Acid (PLLA) is a bioabsorbable implant material due to its favorable biocompatibility and inherent degradability, while the insufficient mechanical strength hinders its further bone repair application. In present work, carbon nanotubes (CNTs) were introduced into PLLA scaffolds fabricated via selective laser sintering. It was found that the crystallinity of PLLA increased considerably since CNTs could promote the orderly stacking of its molecular chains, thereby improving the mechanical strength of PLLA scaffold. Furthermore, the fracture surface analysis revealed that CNTs acted as a bridge across the cracks and hindered their further expansion. Moreover, CNTs pulled out from the matrix to consume a large amount of fracture energy, which enhanced the resistance to external forces. As a consequence, the compressive strength, Vickers hardness and tensile strength of the scaffold were enhanced by 22.7%, 58.8% and 17.6%, respectively. Besides, the cells exhibited good attachment, spreading and proliferation on the scaffold. This study demonstrated that PLLA/CNTs scaffold was a promising candidate as bone implant.

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Section: Discussionmentioning

confidence: 99%

Crystallinity and Reinforcement in Poly-L-Lactic Acid Scaffold Induced by Carbon Nanotubes

Wang

Yang

et al. 2019

Advances in Polymer Technology

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“…The authors attributed this effect to the MWCNTs agglomerates and the GPOSS aggregates present in the epoxy resin. Qi et al also described a synergistic effect on the enhancement of mechanical features of composites after introducing graphene oxide and carbon nanotubes into liquid resin [33].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Epoxy Composites with Both Powder and Fiber Filler: A Review of Mechanical and Thermomechanical Properties

Matykiewicz

2020

Materials

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Fiber-reinforced epoxy composites are used in various branches of industry because of their favorable strength and thermal properties, resistance to chemical and atmospheric conditions, as well as low specific gravity. This review discusses the mechanical and thermomechanical properties of hybrid epoxy composites that were reinforced with glass, carbon, and basalt fabric modified with powder filler. The modification of the epoxy matrix mainly leads to an improvement in its adhesion to the layers of reinforcing fibers in the form of laminate fabrics. Some commonly used epoxy matrix modifiers in powder form include carbon nanotubes, graphene, nanoclay, silica, and natural fillers. Fiber fabric reinforcement can be unidirectional, multidirectional, biaxial, or have plain, twill, and satin weave, etc. Commonly used methods of laminating epoxy composites are hand lay-up process, resin transfer molding, vacuum-assisted resin transfer molding, and hot or cold pressing. The following review is a valuable source of information on multiscale epoxy composites due to the multitude of technological and material solutions.

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“…Typical O-H stretching vibrations (3420 cm −1 ) were detected in ACNT, TCNT and GR, attributed to the oxidation during the purification process [35]. The peak at 1638 cm −1 , 1383 cm −1 , and 1117 cm −1 represents the stretching vibration of C=C, C=O, and the non-symmetric stretching vibration of C-O-C, respectively [36]. These results demonstrate that OH group and carboxylic acid groups were effectively induced via chemical modification, which could contribute to the uniform dispersion of CNTs and GR in aqueous solution.…”

Section: Resultsmentioning

confidence: 98%

Enhancement of electrical and thermal properties of graphene by aligned carbon nanotubes

Guo

et al. 2020

Mater. Res. Express

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In order to explore the composite effects of graphene (GR) and carbon nanotubes (CNTs), GR/CNTs aerogels and GR/CNTs coatings were fabricated. Aligned carbon nanotubes (ACNTs) and twining carbon nanotubes (TCNTs) were comparatively examined by integrating them with graphene, which has seldom been studied in detail. Freeze drying was novelly adopted to retain the liquid distribution in GR/CNTs mixture. Fourier Transform Infrared Spectroscopy (FTIR) analysis demonstrated that OH group and carboxylic acid groups were effectively induced onto CNTs via chemical modification. Scanning electron microscopy (SEM) showed that ACNTs achieved better dispersion and homogeneity in graphene than TCNTs. GR/CNTs hybrid composite with various loading of ACNTs or TCNTs were examined by electrical/thermal conductivity tests and practically evaluated for thermal management in LEDs. Results revealed that the electrical and thermal properties of graphene can be dramatically enhanced by the proper addition of ACNTs due to the formation of effective conductive bridges. The GR/ACNTs aerogel with 10 wt% ACNTs attained a high electrical conductivity of 2.08×10 4 S m −1 , elevated to 2.76×10 4 S m −1 after annealing treatment. The ecofriendly and low-cost GR/ACNTs coating with 10 wt% ACNTs prominently reduced the operating temperature of LEDs by 8.6°C, acting as potential thermal management materials in practical applications.

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Synergistic effect of functionalized graphene oxide and carbon nanotube hybrids on mechanical properties of epoxy composites

Abstract: The 3D structure hybrids obtained by combining CNT and epoxy functionalized GO exhibit an obvious synergistic effect on the improvement of mechanical properties of epoxy composites.

Cited by 57 publications

References 73 publications

Crystallinity and Reinforcement in Poly-L-Lactic Acid Scaffold Induced by Carbon Nanotubes

Crystallinity and Reinforcement in Poly-L-Lactic Acid Scaffold Induced by Carbon Nanotubes

Hybrid Epoxy Composites with Both Powder and Fiber Filler: A Review of Mechanical and Thermomechanical Properties

Enhancement of electrical and thermal properties of graphene by aligned carbon nanotubes

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