The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Brazing C/C composites to Nb is often associated with high residual stress in this research, which results in low-strength joints. To overcome this problem, here we report a novel type of three-dimensional graphene-reinforced Cu foam (G-Cu foam) composite fabricated using chemical vapor deposition. This G-Cu foam was used as an interlayer for brazing C/C composite and Nb. Results show that high-quality...
Surface plasmon resonance effects of nanoparticles, generating local hot spots in a water-air interface under sunlight irradiation to drive water into steam, can realize the highly efficient conversion of solar energy. Here, we develop a novel solar steam generation system with double-layer structures, of which the top reduced graphene oxide (rGO) sheets as a light-to-heat conversion layer and the...
Porous C/Ag nanohybrids were one type of emerging and promising alternative oxygen reduction catalysts for Pt, which was crucial to energy conversion and storage devices. Herein, a template-free, sustainable and in-situ method was employed for preparing N-doped hollow carbon tube @ hierarchically porous carbon supporting homogeneous Ag nanoparticles (HCT@HPC@AgNPs) by one-pot carbonization with the...
The desalination performance of capacitive deionization (CDI) technology is governed by electrode material properties, such as specific surface area, pore size and structure, surface functional groups, electrode geometry, and electrical conductivity. However, few studies have been conducted regarding the impact of the electrical conductivity of electrode materials on the desalination performance of...
Novel composites made of two dimensional (2D) MoS2 nanosheets and graphene (G) have been fabricated by a combined approach of chemical vapor deposition and hydrothermal technique. The G film helps to mediate the growth and dispersion of MoS2 nanosheets, of which the unique role of G in the MoS2 growth is revealed by density functional theory study. The results show that the hexagonal lattice carbon...
SiC nanowires were synthesized by a microwave-heating method at 1480°C for 80min under vacuum, using silicon powder, silica dioxide powder and artificial graphite as raw materials. SEM, TEM and XRD were used to investigate the microstructure of the samples and excitation light with wavelength of 240nm was used to test the photoluminescence properties of the products. Results indicated that β-SiC can...
Fabricating self-supporting, three dimensional graphene macroscopic structures from two dimensional graphene sheets by self-assembly has been an intriguing subject in exploring the performance of graphene structures for practical advanced applications. Monolithic graphene hydrogels (GHs) with quite good mechanical properties and excellent resilience were self-assembled from graphene oxide (GO) dispersions...
Oxidation debris (OD) and graphene oxide (GO) before and after OD removal were characterized by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, mass spectroscopy, X-ray diffraction, transmission electron microscopy and potentiometric titration, respectively. OD removal decreased GO absorption intensity in UV/Vis spectra, caused changes in peak position and absorption intensity...
The strategy to regularly arrange and join the polycyclic aromatic hydrocarbons of asphalt into graphene was explored. Expanded vermiculite with a multi-layered structure was used to adsorb asphaltene molecules onto its surfaces or into its interstices, and graphene sheets with 8–10 graphene layers and a width of tens of microns were obtained by carbonization of the regularly-arranged asphalt molecules...
The shape transformation of gold directly on graphene has been well studied by thermally annealing gold-deposited graphene samples at the temperature range from 600 to 800°C. We find that few-layer graphene can be served as a platform to transform a gold film into mainly hexagonal gold nanoparticles (AuNPs) at 600 or 700°C, or coexistence of hexagonal and triangular AuNPs at 800°C. Especially, the...
The diamond phase has been converted directly from carbon nanotubes by spark plasma sintering (SPS), at 1500°C under 80MPa pressure, without any catalyst being involved. Well-crystallized diamond crystals, with particle sizes ranging from 300nm to 10μm were obtained. After sintering at 1200°C, the tips of the carbon nanotubes were found to be open and the conversion from carbon nanotubes to diamond...
A new air electrode using a combination of dual functional silver/manganese dioxide catalysts based on single-walled carbon nanotubes (SWNTs) was developed by chemically reducing silver permanganate with hydrazine. The electrode prepared comprises a high-quality carbon nanotube support with a complex of manganese dioxide and silver catalysts. The electrocatalytical activity of the electrode was examined...
Double-wall carbon nanotubes (DWCNTs) have been better prepared by thermally decomposing ferrocene mixed with sulphur in the mixture flows of argon and acetylene at 950-1150 o C. The product of DWCNTs has been systematically studied as a function of the reaction temperature, the partial pressure of hydrocarbon, the sublimed temperature of ferrocene, and the relative molar value of ferrocene...
We demonstrate that Fe impurities in double-walled carbon nantoubes (DWNTs) may be greatly depressed by improving the experimental setup in a floating catalyst CVD method. In the paper, the effect of different experimental parameters on sample purity has been systematically studied. The possible reasons for the decrease of impurity in the DWNT samples prepared with the improved apparatus are discussed...
Development of high-temperature adhesives (HTAs) can provide a way to produce carbon materials with a large size or a complex shape. Some HTAs were developed for joining graphite materials. These HTAs were prepared using phenol formaldehyde (PF) resin as matrix and B 4 C powders as fillers. The results showed that these HTAs had satisfactory adhesive properties for graphite bonding even though...
Iron oxide (Fe 2 O 3 ) was examined as an additive to improve the yield of the insoluble fraction in the synthetic mesophase pitch and to inhibit the expansion of the pitch during the heat-treatment and the successive carbonization of the insoluble fraction. The pitch was heat-treated at 350 o C for 4 h under 500 rev./min stirring by adding 0, 6, 17, and 25 wt.% Fe 2 ...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.