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The incorporation of low-dimensional nanomaterials into 3D metal matrices are promising to translate their intriguing properties from nanoscale to the macroscopic world. However, the design of robust nanofillers and effective fabrication of such bulk composites remain challenging. Here we report a configuration design of nanocarbon for reinforcing metals via unzipping carbon nanotubes (CNTs) into...
Methods used to strengthen metals generally also cause a pronounced decrease in ductility and electrical conductivity. In this work a bioinspired strategy is applied to surmount the dilemma. By assembling copper submicron flakes cladded with in-situ grown graphene, graphene/copper matrix composites with a nanolaminated architecture inspired by a natural nacre have been prepared. Owing to a combined...
Despite significant efforts to develop ways to produce customized carbon-based nanostructures, facile synthesis of mass graphene/graphitic nanoribbons (GNRs) without losing the intrinsic sp2-structure and properties remains challenging. Here we report that bulk of multi-layered graphitic nanoribbons can be prepared by gas-phase oxidative splitting of multi-walled carbon nanotubes (MWCNTs) using HNO...
MnO/C hybrid with ultra-small MnO nanoparticles (5.2 nm) embedded in porous carbon is fabricated and applied as the anode material for lithium ion batteries. The MnO/C hybrid electrode exhibits excellent specific capacity of 820 mAh g−1 at a current density of 100 mA g−1 and also outstanding rate performance with specific capacity of 483 mAh g−1 at a current density of 5000 mA g−1. After cycling for...
High-performance reinforcement and tailored architecture are currently explored to develop advanced metal matrix composites. In this work, aluminum (Al) matrix composite reinforced by hybrid carbon nanofillers was fabricated by a composite flake assembly process. It was found that for various carbon nanofiller volume fractions, a striking synergistic strengthening effect was achieved by employing...
As a promising visible-light photocatalyst, BiVO4 is widely used for degradation of organic pollutants, selective synthesis of organics and O2 production from water. Morphology design and coupling with graphene are effective methods to enhance its photocatalytic efficiency. Herein, a novel hydrothermal method was developed for the fabrication of BiVO4 nanoplates with exposed {010} facets onto reduced...
Ultrathin graphitic nanostructures are grown inside solid activated carbon particles by catalytic graphitization method with the aid of Ni. The graphitic nanostructures consist of 3–8 graphitic layers, forming a highly conductive network on the surface of disordered carbon frameworks. Owing to the ultrathin characteristic of the produced graphitic nanostructures, the resulted porous graphitic carbons...
One of the few remaining opportunities to increase heat dissipation in IC circuitry is to substantially decrease the thermal interface resistance between solid–solid contacts from source to sink. In this study, heterogeneous nanostructured mats (1–100μm thick, randomly oriented networks of nanostructures) are synthesized for use as thermal interface materials (TIMs). Recent studies suggest that mats...
A polymer pyrolysis chemical vapor deposition (CVD) route has been established to synthesize homogeneously dispersed carbon nanotubes (CNTs) in Al nanoflakes within a closed batch reactor, with polyethylene glycol (PEG) and cobalt nitrate as precursors of carbon and catalyst, respectively. A parametric study is conducted to control the CNT growth by optimizing parameters such as synthesis temperature,...
A simple approach was developed for the fabrication of a Fe 2 O 3 /carbon composite by impregnating activated carbon with a ferric nitrate solution and calcinating it. The composite contains graphitic layers and 10wt.% Fe 2 O 3 particles of 20–50nm in diameter. The composite has a high specific surface area of ∼828m 2 g −1 and when used as the anode...
A strategy called flake powder metallurgy (flake PM) was used to achieve a uniform distribution of carbon nanotubes (CNTs) in CNT/Al composites and thus realize the potential of CNTs as a reinforcement. It consists of the addressing of the incompatibilities of Al powders with CNTs, uniform adsorption of CNTs onto the Al nanoflake surface by slurry blending and consolidation of as-prepared CNT/Al composite...
A simple approach based on the catalytic pyrolysis of polyethylene glycol (PEG) was developed to grow a uniform dispersion of carbon nanotubes (CNTs) in Al powders and thus supply raw material for the powder metallurgy fabrication of CNT/Al composites. Al nanoflake powders with quite a large surface area were used to adsorb a homogeneous PEG and citric acid film, and then were impregnated with a cobalt...
A slurry based process was developed to achieve the uniform dispersion of a high volume fraction of carbon nanotubes (CNTs) in aluminum powder. Al powder was subjected to surface modification to introduce a hydrophilic polyvinyl alcohol (PVA) membrane on its surface, which has good wettability and strong hydrogen bonding interactivity with functionalized CNTs. It was found that, when mixed with a...
An ultrathin and super black amorphous carbon (a-C) film has been fabricated by borrowing the inverse V-type anti-reflection nano-architecture from the black wings of butterfly Ornithoptera goliath through vacuum sintering process. The biomimetic a-C film shows good optical absorption (99%) at low reflectance (<1%) in visible light (380–795nm), which is comparable to the previously fabricated darkest...
Carbon nanospheres (CNSs) with the diameters of 50–250nm were synthesized through a one-step solvothermal method at about 300°C. In this process, benzene and hexachloroethane (C 2 Cl 6 ) served as carbon source for the CNSs. The results showed that the CNSs were composed of a mixture of graphitic nanocrystallites and amorphous carbon. It is believed that they formed through intermolecular...
Carbon-matrix composites with self-assembly interconnected carbon nano-ribbon networks were fabricated using natural and inexpensive rice husks by impregnating the rice husks with transitional metal solutions and sintering. The nano-structure of the composite was characterized using transmission electron microscopy. The electromagnetic interference shielding effectiveness of the composite was evaluated...
Wood with its rational and magical inner structures was used as a template to fabricate carbon/aluminum composites in this research. The carbon frame was first pyrolyzed from the wood template. The final composites were then obtained by infiltrating Al alloy into the carbon frame. The microstructures and the wear properties of these products were analyzed. The results show that the structures of the...
Wood is a natural material with a novel and ordered hierarchical structure. In the present work, it is used as a bio-template to produce morph-genetic TiC/C ceramics. This is obtained by infiltrating the carbon preform pyrolyzed from wood with tetrabutyl titanate. It was subsequently sintered at 1400 o C to produce the final ceramic structure.By observing the microstructure under the scanning...
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