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Core-shell porous carbon represents an innovative concept for optimizing performances of carbon materials in a wide range application. Here, a novel route to produce carbons with spatially varying pore and microstructure is presented. Following the carbide-derived carbon method, a homogeneous and adjustable shell generation is achieved through mixing a limited amount of solid chlorine precursors with...
Carbon sponges-type nanostructures (CSTN) based on coaxial nitrogen-doped multiwalled carbon nanotubes (CA-MWCNTs) were synthesized using the aerosol assisted chemical vapor deposition method involving the decomposition of a mixture of ferrocene, benzylamine, thiophene, and ethanol at 1020 °C under a flow of H2/Ar. Sample morphology and composition profiles were analyzed by scanning electron microscopy...
A remarkable synergetic effect between the graphene (GR) and carbon nanotube (CNT) in improving the interfacial mechanical properties of polyethylene polymer composites was investigated using molecular dynamics simulations. The reinforcement effects of two types of hybrid GR-CNT were evaluated. For the π−π stack hybrid GR-CNT, the alignment of CNT has a slight effect on the interfacial mechanical...
Over the last decade there has been an increasing worldwide demand for electrochemically active materials for supercapacitor applications. In this study, a novel PANI derivative, poly (2-methyl thioaniline) coated MWCNT (PMTA@CNT) and its composite with graphene (PMTA@CNT/RGO) have been explored for supercapacitor application. Both the PMTA@CNT and PMTA@CNT/RGO electrodes showed much higher specific...
Graphene has received great attention owing to its superior physical properties, making graphene suitable for multiple applications. Numerous graphene growth techniques have been developed in the past decade to provide scalable high quality graphene. Among these techniques, chemical vapor deposition (CVD) on catalytic metal films holds great promises for a large-scale graphene growth. Even though...
Resolving the structure-activity relationship of doped-nitrogen (N)-based active sites on carbon and their variation mechanism during oxygen reduction reaction (ORR) process have been very desirable for the deep understanding of doped-N-based carbon materials. Here, by correlating the ORR catalytic performance with chemical compositions of N-doped carbon samples and performing systematic quantum chemical...
There is a constant need to develop advantageous materials for removing radioactive waste from aqueous systems. Here we propose a new carbon-based material prepared by oxidative treatment of various natural carbon sources. The as-prepared oxidatively modified carbon (OMC) has an oxygen-rich surface, and retains its particulate granular texture. It has relatively low cost and can be used in traditional...
Ultralight cellulose fiber/thermally reduced graphene oxide (CF/RGO) hybrid aerogel with super-elasticity and excellent electromagnetic interference (EMI) shielding capability was fabricated through lyophilization and carbonization process. CF/RGO aerogel with 5 mm thickness exhibits high EMI shielding effectiveness (SE) of ∼47.8 dB after annealing at 1000 °C with 5% hydrogen-argon mixture atmosphere...
Optical absorption in combination with resonant Raman spectroscopies were used for the determination of (n,m) distribution and the absolute concentration of single-wall carbon nanotubes (SWCNT) species in few chiralities enriched dispersions. Relative (n,m) content was obtained from Raman excitation profiles of the radial breathing modes corrected by the respective Raman cross sections. Absolute concentrations...
Pesticide plays an important role in the agricultural production, however more than 90% of pesticide goes non-target. Present study, uses reduced graphene oxide for controlled and targeted pesticide delivery, as it can bind drug until native larval gut condition appears. Graphene oxide is not reported for pesticide delivery and here with reference to graphene oxide ∼400% pesticide loading (w/w) is...
We have investigated the in-situ electron irradiation of nuclear graphite within a 200 kV transmission electron microscope at temperatures between 83 K and 473 K. For each temperature, nuclear grade Pile Grade A graphite specimens were subject to a fluence of ca. 1022 electrons cm−2, and transmission electron micrographs and selected area diffraction patterns were collected during electron beam exposure...
Carbon nanotubes (CNTs) can improve the fracture toughness of ceramic composites. It is widely believed that defects in the CNTs will alter key properties that ultimately dictate composite toughening. However, to date there have been no studies that directly correlate these specific properties to controlled defect levels in CNTs. This type of investigation is presented here, using ceramic nanocomposites...
Compared with mechanically exfoliated and chemical vapor deposited graphene, reduced graphene oxide (RGO) possesses unique advantages such as a wet process synthesis, high yield and the ability to assemble large-area thin films on various substrates. However, RGO is normally not recommended for advanced devices owing to its poor electrical conductivity. We report a new method to prepare highly conductive...
A simple, highly scalable method of obtaining densely-packed, three-dimensional structures of interconnected, bilayer, hollow carbon nanocages, is reported. High-quality nanocages with well controlled wall thickness are synthesized via catalytic templating on densely-packed, mono-sized nickel nanoparticles, nucleating in situ during short, mid-temperature annealing of an inexpensive precursor obtained...
Structural flexibility in a petroleum pitch-derived carbon material has been indirectly evaluated using X-ray diffraction (XRD), immersion calorimetry and inelastic neutron scattering (INS) measurements. Exposure of the carbon material to an organic solvent (e.g., n-nonane) gives rise to a large internal rearrangement, associated with a drastic re-ordering of the graphitic microdomains. These structural...
Flowing gases of hydrocarbon molecules were irradiated by tightly focused ns and fs laser, and the products were captured in hexane solution. In the case of ns laser irradiation, short polyynes up to C12H2 were produced efficiently from all the hydrocarbons, propane, hexane, octane, benzene, and toluene. The yields vary significantly among the products from different target molecules, extending beyond...
The effect of graphene defects on the performance of polymer-based material was investigated to obtain thermal conductive and strong materials for various commercial portable electronics. The flexible lateral heat hybrid films based on graphene sheets (GSs) and nanofibrillated cellulose (NFC) were fabricated via a vacuum-assisted self-assembly technique. The hybrid film with low-defect density GSs...
In the present study, different in vitro and electrochemical protocols were employed to determine the mitoprotective properties of carbon nanotubes family (pristine-CNT, oxidized-CNT) based on free radical scavenging ability against the most aggressive reactive oxygen species (ROS) as hydroxyl radical (·OH) formed by Fenton-Haber-Weiss reaction, which was experimentally induced on isolated rat-liver...
We have applied the sphere-in-contact model supported by hybrid Density Functional Theory (DFT) calculations to elucidate the cap geometry of the sub-nanometer in dimension (3,3), (4,4) and (5,5) single-wall carbon-nanotubes (SWCNTs). Our approach predicts certain cap-geometries that do not comprise of the commonly known for their stability combination of pentagonal and hexagonal carbon rings but...
Complex fabrication methods for carbon nanotubes limit their potential for scale-up and use in practical applications. This study developed a simple method to deposit multiwall carbon nanotube (MWCNT) forest-like films from polyacrylonitrile and MWCNT solutions by coaxial electrospray. A MWCNT solution was used as the shell flow to generate vertically aligned tree-like structures at mesoscopic scale...
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