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Water vapor adsorption on porous carbons has been actively studied because of its importance in various applications and basic science. However, the unique behavior and structure of water in carbon nanospaces have still been remained unclear. Carbon nanotubes inherently have rather restricted one-dimensional nanospaces and thus, force the adsorbed water to be aligned in them. The structure of water...
Fabrication of monolayer graphene is a challenge and many processes yield few-layer or multi-layer graphene materials instead. The layer number is an important property of those materials and a quality control variable in graphene manufacture. We demonstrated that N 2 adsorption on graphene materials was used to distinguish its layer number. We performed grand canonical Monte Carlo simulation...
Single wall carbon nanotubes (SWCNTs) were treated with a HNO 3 /H 2 SO 4 mixed solution to increase the number of narrow micropores. The mixed acid treatment increased the micropore volume from 0.13 to 0.35mLg −1 as measured by N 2 adsorption at 77 K. The micropore volume evaluated with CO 2 adsorption at 273K increased from 0.06 to 0.27mLg −1 ...
Fluorinated activated carbon fibers (F-ACFs) were prepared by direct thermal fluorination of pristine activated carbon fibers. By the pyrolysis of F-ACFs at 1073K under nitrogen gas flow, fluorine was subsequently eliminated and the sp 2 -bonded ACF structures were recovered. The micropore widths were 1.1 and 0.8nm, and the isosteric heats of adsorption of nitrogen were 11.3 and 12.8kJ/mol...
A soft chemical method was used to insert silica bridging species between the layers of a graphite oxide precursor to form nanoporous graphitic composites (NPGC) and the effect of various synthetic conditions including colloidal dispersion, interlayer pre-expansion, and hydrolysis of silica source on the pore formation of NPGC was examined. It was found that an optimal alkali concentration for GO...
Predominant mesopores were added to pitch-based activated carbon fiber (0.7nm of average pore width) by Ca(NO 3 ) 2 -impregnated chemical activation. The influence of the concentration of calcium nitrate solution, reactivation temperature and reactivation time on the mesopore development of ACF were examined. The development of mesopores in the reactivated ACF was evidenced by an explicit...
Recently developed two lattice density functional theory (DFT) models are verified experimentally. For this purpose the experimental nitrogen isotherms on carbon blacks at 77 K (M4040 and M32B) were carefully measured by the volumetric apparatus. Moreover, the additional nitrogen data on Sterling FT and SAO carbon blacks were taken from the literature and analyzed. The main goal of this study is the...
Structural and surface property changes of macadamia nut-shell (MNS) char upon activation and high temperature treatment (HTT) were studied by high-resolution nitrogen adsorption, diffuse reflectance infra-red Fourier transform spectroscopy, X-ray photoelectron spectroscopy, and temperature-programmed desorption. It is found that activation of MNS char can be divided into the low extent activation...
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