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Powder injection moulding and sintering were used to obtain iron-based self-lubricating composites in which SiC particles were used as precursors to generate graphite nodules dispersed in the composite matrix. Using thermodynamic simulations with DICTRA®, it was possible to predict the SiC dissociation in the ferrous matrix studied (Fe+0.6C). The evolution of the dissociation of SiC particles during...
The authors report on the marked improvement of the quality factor (Q-factor) of single crystal diamond (SCD) nanoelectromechanical system (NEMS) resonators through annealing in oxygen ambient. The SCD NEMS resonators were fabricated by ion implantation assisted technique. The resonance frequency followed well the inverse power law relationship with the length of the cantilevers despite of the annealing...
With the rapid progress of wearable electronics, it is highly desirable to develop flexible power supplies, and significant progress has been thus made in making a variety of flexible batteries. Here the recent advances of flexible lithium ion batteries based on carbon nanomaterials have been carefully discussed from the viewpoint of material synthesis, structure design and property optimization....
We have developed a novel method for crystalline hydrogenation of graphene on the nanoscale. Molecular hydrogen was physisorbed at 5 K onto pristine graphene islands grown on Cu(111) in ultrahigh vacuum. Field emission local to the tip of a scanning tunneling microscope dissociates H2 and results in hydrogenated graphene. At lower coverage, isolated point defects are found on the graphene and are...
Hybrid materials containing single atoms or molecule-based active species immobilized on nanomaterials have been suggested as new, efficient catalytic systems for various reactions. In this study, novel hybrid materials consisting of molecularly dispersed Ni-based species on a graphitic carbon nitride (g-C3N4) framework are prepared, and their excellent electrocatalytic performance for the oxygen...
This work provides the first explicit report of the linear absorption coefficient α of materials in the radio frequency regime (0.1–1.5 GHz). The coefficient decreases with increasing carbon thickness. The highest α (940 mm−1) is provided by the smallest carbon thickness (7 μm). The lowest α (38 mm−1) is provided by the largest carbon thickness (460 μm). For carbon thicknesses that are much larger...
13C-enriched fine-grained graphitic material has been studied towards its potential for chemical and electrochemical applications. The structural and morphological modification of the material as results of pressure-assisted thermal treatment and gaseous BrF3 and/or Br2 room-temperature treatments has been investigated using a combination of the characterization tools: electron microscopy, Raman spectroscopy,...
Laser heating was used to study the rates and trajectories of carbon black during the earliest stages of annealing. A commercial carbon black, Regal 250 (R250 Cabot Corporation) was heated with a Q-switched Nd:YAG laser and a continuous wave CO2 laser. Structural transformations were observed with transmission electron microscopy. Micrographs were processed with in-house codes for the purpose of extracting...
The carbonaceous particulate matter (soot plus organic carbon) sampled downstream of an ethylene inverse diffusion flame (IDF) was chemically and spectroscopically analyzed in detail. In particular, the H/C ratio, the UV–Visible absorption coefficient and Raman parameters were measured and found to be representative of a highly disordered sp2-rich carbon as the early soot sampled in a premixed flame...
By leveraging decades of research on the catalytic synthesis of carbon nanofibers and combining it with unique processing methodology, low density monolithic carbon can be created. The process is simple, scalable and controllable. Analysis of deposition kinetics reveals that the final density of centimeter-scale carbon monoliths can be determined through basic process parameters, and the synthesis...
Nitrogen doped carbon materials, as the most promising non-metal electrocatalyst for oxygen reduction reaction (ORR), have attracted great attention because of their catalytic activities approaching to that of commercial Pt/C, good ethanol tolerance, low price and chemical stability. Here, we demonstrate the conjugated polymer-mediated synthesis of a series of nitrogen doped carbon nanoribbons (NDCNRs)...
Mo2C@NC@MoSx porous nanospheres with sandwich shell have been synthesized for efficient hydrogen evolution in both acidic and alkaline media. Firstly, porous MoO2-Mo2C@NC nanospheres have been obtained with ultrafine Mo2C nanocrystallines as core and ultrathin N-doped carbon (NC) as shell through the carbonization of MoO42--/aniline-pyrrole (MoO42--Polymer) as precursor. Secondly, Mo2C@NC@MoSx porous...
Two kinds of turbostratic carbon coatings with different texture were deposited on SiC fibers using single filament chemical vapor deposition by changing substrate temperature: 920 and 1000 °C, labeled as C920 and C1000, respectively, followed by coating Ti17 matrix, and then SiCf/C920/Ti17 and SiCf/C1000/Ti17 composites were fabricated by hot isostatic pressing (HIP). C1000 possesses much stronger...
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