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Super-stretchable helical structures made from carbon nanotube (CNT) fibers are promising candidates for applications in stretchable and wearable devices. A multi-scale model of the helical structures of CNT/polymer composite fibers is presented to gain more insight into their deformation properties and damage mechanisms. By imitating the practical preparation process, a suitable model for the helical...
Carbon-bonded carbon fiber composites (CBCFs) were widely used as thermal insulation materials due to their light weight and ultra-low thermal conductivity. The CBCFs with density of about 0.256 g/cm3 were tested in compression with the modulus and strength evaluated. The in-plane and out-of-plane tests revealed obvious anisotropic behavior of the material, which could be attributed to the fibers...
Contrary to most materials, graphene exhibits a negative thermal expansion coefficient (TEC), i.e it contracts when heated. This contraction is due to the thermal excitation of low energy out–of–plane vibration modes. These flexural modes have been reported to govern the electronic transport and the mechanical response of suspended graphene. In this work, we systematically investigate the influence...
We report an effective method for fabricating graphene-based multifunctional polyimide (PI) nanocomposites via in situ polymerization, by the chemical defect-healing of pyridine functionalized reduced graphene oxide (H-Py-RGO). H-Py-RGO was successfully obtained through intramolecular cross-dehydrogenative coupling (ICDC). The mechanical properties, and thermal stability of the PI/H-Py-RGO nanocomposites...
The poor dispersion of graphene-based materials and the weak interfacial interaction between the nanofillers and polymer matrix greatly limit the reinforcing efficiency of graphene-based nanofillers on polymers. Moreover, the polymers reinforced with graphene usually tend to be brittle. In this paper, hybrid GO/CNT nanostructure was designed and cross-linked through amide bond, which can disperse...
Recently synthesized diamond nanothreads (DNTs), collecting desired properties of both inorganic nanostructures and hydrocarbon molecular structures, are an interesting group of carbon-based materials. Using full atomistic first-principles based ReaxFF molecular dynamics (MD) simulations, a comprehensive study on tensile and bending mechanical characteristics of fifteen energy-favorable DNTs is performed...
The ability to produce homogeneous defect-free carbon nanotubes (CNTs) represents a major challenge in terms of utility and cost. Specifically, the existence of grain boundaries (GBs) are ubiquitous in large diameter CNTs obtained by various large-scale growth methods and their effects on the mechanical properties of CNTs are not fully explored. Understanding the influence of the grain size and the...
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