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Three carbon materials having unique and precise shapes were prepared using a polymer blend technique and coating as an auxiliary technique. The polymer blend consists essentially of two kinds of polymers, i.e. a carbon precursor polymer and a decomposable polymer which disappears by pyrolysis without leaving a carbon residue. One of the carbon materials prepared is a carbon fiber including many thin...
Fibrous porous materials (FPMs) have been prepared by coating a glass fiber with a solution of polymer and ZnCl 2 , followed by stabilization in air and heat treatment in N 2 . The ZnCl 2 was then removed by washing with D.I. water and HCl. Four kinds of polymers, a phenolic resin, polyacrylonitrile, poly(vinyl alcohol) and cellulose, were used to prepare solutions with ZnCl...
A novel method was developed for minute deposition of polyaniline onto microporous activated carbon fabric to enhance the capacitance of the carbon serving as electrodes for electrochemical capacitors. The deposition consisted of pre-adsorption of monomer into carbon micropores followed by electrochemical polymerization of the adsorbed monomer in a monomer-free H 2 SO 4 solution at...
Despite commonly accepted ideas, evaporative drying does not always completely destroy the pore texture of phenolic gel. This work shows that very porous carbon materials can be synthesized by evaporative drying and pyrolysis of aqueous resorcinol–formaldehyde gels provided that the operating variables are correctly chosen. Moreover, in this manner monoliths can be easily produced. The pore texture...
We studied the electronic structure of nanostructured C films produced by ultrasonic cluster beam deposition with the intention to find out the bonding configuration of the C network and to determine the modification induced by transition metal cluster inclusion in the film. Exploiting the energy and spatial resolution of the Spectromicroscopy beamline at Elettra Synchrotron, we were able to follow...
The present work is a numerical study to predict the growth mechanism of a non-spherical bubble assisted for a carbon foam fabrication process. An approach for two dimensional non-spherical mass-diffusion controlled bubble growth in an isothermal Newtonian liquid of infinite extent is considered. Using the two dimensional unsteady form of the equations governing the conservation of mass and momentum,...
The adsorption behaviors of phenol in aqueous solution on zeolite-templated porous carbons with different pore structures and surface properties were studied. The structural and surface properties of the carbon samples were characterized using N 2 adsorption, water vapor adsorption, X-ray photoelectron spectrometer (XPS), and thermogravimetric analysis (TGA). It was observed that thermal treatment...
A large specific surface area (SSA) of carbon materials used for electrochemical double layer capacitors (EDLC) is the most important parameter leading to a large gravimetric capacitance (C g ). However, for a SSA determined with the differential functional theory (DFT) model above a value of 1200m 2 /g the plot of C g versus S DFT exhibits a plateau. We suggest that...
Carbon-coated anatase-type TiO 2 was prepared by the heat treatment of powder mixtures of photocatalyst TiO 2 (ST-01) with different carbon precursors, poly(vinyl alcohol), hydroxyl propyl cellulose and poly(ethylene terephthalate), at a temperature between 700 and 900°C for 1h in an Ar gas flow. Since the carbon layers formed on the TiO 2 particles were porous, the samples...
Colloidal microporous carbon (MC) spheres with an average size of 260nm–1.5μm were prepared by carbonization of “nonstick” poly(furfuryl alcohol) (PFA) spheres, which were synthesized by a two-step polymerization of furfuryl alcohol (FA) involving slow polymerization (1st step) and sphere formation (2nd step). The high dispersibility of the MC spheres was simultaneously realized by removing surface...
Mesoporous carbon materials were synthesized using sucrose as carbon precursor and commercial silica as template. Every step of the synthesis such as pore filling, loss of carbon precursor during carbonization and development of the carbon pore system during silica removal have been investigated in detail. As a criterion for the quality of the obtained carbon materials, the pore size distribution...
Three ordered mesoporous carbon materials (OMC) were prepared by pyrolysis of sucrose filled in the mesoporous channels of SBA-15 at three different temperatures of 600°C (OMC-600), 850°C (OMC-850) and 1100°C (OMC-1100), and followed by dissolution of the silica matrix in hydrofluoric acid. The pore structures and surface characteristics of the OMC materials were evaluated using XRD, nitrogen adsorption,...
Synthesis of nanoporous carbide-derived carbon, CDC, by extraction of titanium and silicon from Ti 3 SiC 2 by chlorine is discussed in this work. Thermodynamic simulations using a Gibbs free energy minimization program provided general guidelines to the experimental design. Raman spectroscopy, X-ray diffraction, and electron microscopy studies showed that the structure of CDC depends...
Ordered microporous carbon with a structure of amorphous carbon core and graphitic carbon shell was prepared using hydrogen-form zeolite Y as the template. Impregnation and chemical vapor deposition methods were employed to infiltrate carbon in the pores of the template. Physical adsorption of nitrogen, X-ray diffraction, thermogravimetric analysis, field-emission scanning electron microscope, and...
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