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A correlation between film structures and the width of the potential windows defined by the dihydrogen and dioxygen evolutions in aqueous media at nitrogen-doped amorphous carbon thin film electrodes prepared using a filtered cathodic vacuum arc system is reported. A range of film structures were obtained by changing the nitrogen mass flow rate during deposition, and the film structures were determined...
The isosteric heat of adsorption in the Henry’s law region is calculated as a function of the width of slit-shaped pores. We determine the pore width where the isosteric heat is a maximum, which is shown to be a strong function of the solid–fluid collision diameter σ sf and a weak function of the solid–fluid well depth potential ϵ sf . Thus, general results are reported for the pore...
The percolation transition and the hydrostatic piezoresistance for carbon black (CB) filled poly(methylvinylsilioxane) vulcanizates were studied as a function of CB volume fraction. A revised tunneling-percolation model based on the method of “subcritical networks” was proposed, which can not only account for the apparent nonuniversal percolation, but also figure out the contribution of changing tunneling...
Carbon nanohorns (CNHs) are a relatively new material within the family of elongated carbon nanostructures. A strategy for their solubilization is presented here. Aryl diazonium functionalization of CNHs has been achieved giving rise to soluble materials in common organic solvents as well as water. The modified CNHs have been characterized by complementary spectroscopic and microscopic means as well...
Carbon nanofiber (CNF)/resole phenolic resin (Hitco 134A) composites exhibited very large increases of bending storage modulus above the glass transition temperature and had higher glass transition temperatures with increasing CNF weight percentage. Small angle neutron scattering (SANS) from dilute suspensions of surface-oxidized CNF in D 2 O exhibited a Guinier plateau in the q range examined,...
Felt-like mats (6–7μm thick) of multiwalled carbon nanotubes wrapped into scrolls have been synthesized by chemical vapor deposition from a toluene–ferrocene mixture using a temperature ramp from 680°C to 550°C in hydrogen–argon atmosphere. Thermogravimetric analysis reveals a very low catalyst content of ca. 1.25wt% in the as-synthesized sample while, X-ray photo electron and Raman spectroscopies...
C/C composites with different porosities, produced by chemical vapor infiltration have been mechanically tested under quasi-static loading in bending modes using uniform and notched specimens. The acoustic emission (AE) method was used to monitor the damage accumulation profile during loading up to fracture, supported by optical and scanning electron microscope characterization. Three stages in the...
Diamond thin films (on silicon wafers) and carbon nanotubes (CNTs) (on Inconel plates) were simultaneously synthesized at temperatures ⩽550°C without any additional catalyst. The synthesis was achieved in a microwave plasma enhanced chemical vapor deposition (CVD) reactor with graphite etching in a gas mixture of hydrogen and methane. The substrate stage consisted of an Inconel 600 plate and a stainless...
The elastoplastic contact surface deformations of copper–graphite particulate composites are examined in instrumented Vickers/spherical indentation tests. The composites include various contents of metallic Cu-particles with various sizes and shapes originated from the starting powders, that are mixed with flaky natural graphite having various sizes. The elastoplastic surface deformations of the composites...
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 ...
An energetic analysis was performed to study the interactions of C 60 molecules encapsulated in carbon nanotubes. Both direct interaction between C 60 molecules through van der Waals forces and indirect interaction between encapsulated C 60 molecules through the elastic deformation of their host carbon nanotubes were considered. For C 60 s encapsulated in a (9,9) nanotube,...
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