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It is well accepted that due to epitaxy matching, carbon nanotubes are good nucleating agent for linear polyethylene. We demonstrate that not only in the quiescent conditions but also at the relatively low shear rates the presence of single-walled carbon nanotube (SWCNT) accelerates the crystallization kinetics of polyethylene (PE). The influence of SWCNTs on the crystallization kinetics in the quiescent...
A simple approach for spontaneous, catalyst-free formation of highly graphitic nitrogen-containing carbon nanocages has been demonstrated by using commercially available graphite rods as the initial materials. The resultant carbon nanocages have well-ordered graphitic shells with more compact graphite layer structure than that of conventional bulk graphite. The incorporation of nitrogen into the graphitic...
Thin films of silylated graphite oxide were obtained from a chloroform/cyclohexane dispersion of n-hexadecylamine-intercalated silylated graphite oxide by a casting method at a low temperature. Carbon-based thin films were obtained from the pyrolysis of the resulting films under a reduced pressure at 500°C or higher temperatures. The resulting samples were well adhered to the substrate because of...
We used carbon nanotubes as oil adsorbents and evaluated recycling performance by squeezing method. The sorption capacity of 3mm long vertically aligned carbon nanotubes is almost 6.9 times higher than that of agglomerated carbon nanotubes due to the existence of large-sized macropores. Compared with exfoliated graphite (41g/g), aligned carbon nanotubes exhibit higher sorption capacity (69g/g) and...
Molecular dynamics simulations were used to investigate the deformation behavior of gold-filled single-walled carbon nanotubes under axial compression. The simulation results show that the buckling strength of Au-filled carbon nanotubes is increased compared with that of a hollow tube, and is similar to the effect of filling with gases or fullerenes. The interactions between filling elements and the...
The longest-chain polyyne that has ever been synthesized is C 24 H 2 by Estmond et al. [1] using the complicated acetylene coupling method. On the other hand, in simple liquid-phase laser ablation method, we have recently obtained the longest-chain polyyne of C 22 H 2 . In the present study, we report the synthesis of long-chain polyynes of C 24 H 2 ...
Microwave absorbing composites with epoxy-silicone as matrix and both multi-walled carbon nanotubes (MWCNTs) and carbonyl iron (CI) particles as absorbers were prepared, and their electromagnetic and microwave absorbing properties were investigated in the frequency range of 2–18GHz. The microstructures of the composites show a uniform dispersion of the MWCNTs and CI particles in the matrix. The complex...
A technique to fabricate porous carbon micropillars using a block copolymer, F127, as porogen is described. In this process, negative tone photoresist (i.e. SU-8) mixed with F127 was photopatterned and carbonized under inert atmosphere. The thermal behavior of the photoresist precursor (F127+SU-8) during carbonization process was characterized using differential scanning calorimetry and thermogravimetric...
A mesoporous carbon membrane was prepared by the organic sol–gel process, ambient drying and carbonization. Resorcinol was polymerized with formaldehyde and formed a sol. The sol was cast on a porous fly-ash ceramic support by dip-coating. After ambient drying and carbonization, a carbon membrane was obtained. The carbon membrane exhibited a sharp pore size distribution with average diameter of 3nm.
Mesoporous carbon materials were prepared through template method approach using porous clay heterostructures (PCHs) as matrix and furfuryl alcohol as carbon precursor. Three PCHs prepared using amines with 8, 10 and 12 carbon atoms were used. The effect of several impregnation–polymerization cycles of the carbon precursor, the carbonization temperature and the need of a previous surface alumination...
We have prepared graphene dispersions, stabilised by polyurethane in tetrahydrofuran and dimethylformamide. These dispersions can be drop-cast to produce free-standing composite films. The graphene mass fraction is determined by the concentration of dispersed graphene and can be controllably varied from 0% to 90%. Raman spectroscopy and helium ion microscopy show the graphene to be well-dispersed...
The classical DR method and the Quenched Solid Density Functional Theory (QSDFT) approach have been used to analyse N 2 at 77K isotherms determined on activated carbons prepared by alkaline chemical activation of different lignins. The QSDFT pore size distributions are bimodal with a narrow peak below 1nm and a broad peak from 1 to 2.5–3.5nm. Deconvolution allows estimation of the volumes...
Graphite oxide was prepared by the Hummers method. Then after further oxidation, a new kind of carbon nanoparticle, with diameter 10–30nm, was formed in the aqueous solution. On the basis of structural characterization by X-ray diffraction, Fourier transform infrared spectroscopy, and transmission electron microscopy it is deduced that the nanoparticles are generated by the self-assembly of few-layer...
Carbon nanotubes (CNTs) were synthesized from polyethylene using a pyrolysis–combustion technique. Pre- or post-consumer polyethylene (in strips, pellets or ground particles) was pyrolyzed to gaseous products, which were then combined with an oxygen-containing gas and auto-ignited to create a fuel-rich flame. The combustion effluent was used to synthesize multi-wall CNTs using stainless-steel wire...
Carbon particle structures containing only a few graphene layers have been collected from a Bunsen (propane) diffusion flame in the low particle concentration pale yellow luminous regions close to the soot inception. These particles were sampled directly on transmission electron microscopy grids for structural and elemental analysis. They were found to be several hundreds of nanometers in size. Such...
Carbon spheres (CSs) of 1–15μm in size were found in metallurgical coke for the first time as by-products of large-scale industrial process. CSs form a dense cover on the surface of pores and occur as separate aggregates varying in size and shape. Their formation may be associated with the circulation of coke oven gas in the contact area between the coke and the refractory silica bricks of the oven...
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