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Fine-tuning magnetic states by understanding topological frustration inducing magnetic mechanism should allow greater flexibility for the design of graphene-based spintronics. Based on first-principles calculations, it is predicted that bowtie-shaped graphene nanoflake (GNF) is of spin-polarized ground state exhibiting antiferromagnetic (AFM) ordering between two individual triangular GNFs. It is...
We report large positive magnetoresistance (MR) of over 12% at 273 K in graphene nanocrystallited pure carbon film. MR behaviors at different temperatures implied that low temperature MR was from carrier diffusive scattering and room temperature MR was from spin arrangement effect. Temperature dependences of the film resistance and magnetization recognized that as temperature decreased from 300 to...
Recent experiments have shown that the graphene foam material exhibits a rubber-like constitutive behavior and a near-zero Poisson's ratio. We have performed coarse grain molecular dynamics simulations, which show that these intriguing phenomena can be attributed to the microstructure deformation, rearrangement and compaction in three stages, respectively. The elastic deformation of microstructures...
The mechanical characteristics of nano-scale interface between by carbon nanotubes (CNTs) play critical roles in macro-mechanical properties of CNT-based hierarchical composites. In this study, an in-situ peeling experiment for a sidewall-contacted junction assembled by two individual CNTs was achieved by using a force measurement system in the scanning electron microscope. The whole peeling mechanical...
Dedicated Raman investigation was performed on the graphene suspended on the round holes, compared with graphene supported on Si/SiO2 substrate, in the temperature range from 173 K to 673 K. We observed an unexpected result that the temperature-dependent Raman frequency shift of suspended graphene was similar as that of supported graphene. This evidenced that the strain caused by thermal expansion...
A novel P–N containing intumescent flame retardant, 2-cyclic pentaerythritoloctahydrogen tetraphosphate-4,6-benzene sulfonic acid sodium ammion-triazine (CTOB) was synthesized and used as an additive in intumescent flame retardant composites containing organic montmorillonite (OMMT) and Nylon 6. The thermal stability and flammability properties of Nylon 6, CTOB, OMMT and their composites were investigated...
The mechanical characteristics of graphene oxide (GO) play a critical role in its great applications. In this study, based on the experimental fracture data of individual multilayer free-standing GO sheets under tensile load, in combination with finite element analysis and molecular dynamics (MD) simulations, the failure strength, strain, and Young’s modulus are estimated to be 4–5GPa, 8–15%, and...
Porous materials such as foams, sponges and aerogels typically exhibit large energy dissipation during deformation, resulting in structural weakening and incomplete recovery. Here, we adopted a vapor deposition method to introduce a uniform amorphous carbon (AC) coating with controlled thickness throughout the porous network, on the surface of individual carbon nanotubes (CNTs) as well as their junctions,...
The grafting force of carbon nanotube (CNT) on carbon fiber (CF) and the wettability of CF surface were experimentally studied, where hierarchical CNT/CF reinforcement was prepared using chemical vapor deposition (CVD). Then, their effects on interfacial improvement were experimentally and theoretically investigated. The results show that the CNT/CF grafting force is so strong, more than 5μN, and...
The mechanical enhancement of carbon nanotube (CNT) networks by mobile and discrete binders was explored by performing coarse-grained molecular dynamics (CGMD) simulations. The underlying mechanism of modifying deformation affinity is elucidated. We perform tensile tests and dynamical mechanical analysis (DMA) to quantify the strength, energy dissipation capacity, and viscoelastic performance of the...
Controlling the assembled structures of graphene has recently attracted enormous attention due to intriguing properties of the resultant structures. In this study, three-dimensional (3D) porous structures of reduced graphene oxide (RGO) with various ratios of RGO to cellulose have been fabricated by a scalable, but simple and efficient, approach that consists of ball milling assisted chemical reduction...
Graphene–Bi 2 MoO 6 (G–Bi 2 MoO 6 ) hybrid photocatalysts were prepared by a simple one-step process in which the reduction of graphene oxide (GO) and the growth of Bi 2 MoO 6 crystals occurred simultaneously. The material was characterized by X-ray diffraction, scanning electron microscopy, nitrogen adsorption–desorption isotherms, X-ray photoelectron...
Hierarchical structures consisting of carbon nanotubes (CNTs) grafted onto a carbon fiber (CF) have the potential to improve the performance of fiber/polymer composites. The strength between a CNT and a CF is a key factor that influences the load-transfer behavior and inter-laminar properties. Here, we directly measured the grafting strength of a chemically bonded CNT–CF hierarchical structure by...
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