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The mono-dispersed and uniform CoFe 2 O 4 nanoparticles were synthesized by the thermal decomposition of Fe(acac) 3 and Co(acac) 2 . Then the CoFe 2 O 4 nanoparticles were diluted in amorphous SiO 2 matrix with different CoFe 2 O 4 nanoparticles’ concentrations. All samples show the positive or negative exchange bias behavior,...
The reported hydrogen uptake of carbon nanotubes (CNTs) has been the subject of much controversy. We have measured the hydrogen uptake capacity of different types of CNTs using a volumetric measurement setup specifically-designed for CNTs. It was found that under a pressure of ∼12MPa and at room temperature, the hydrogen storage capacity of the CNTs is less than 1.7wt.%, which is far below the benchmark...
Multi-walled carbon nanotubes (MWNTs) with different mean outer diameters in the range of 13-53 nm, synthesized by the catalytic decomposition of hydrocarbons using a floating catalyst method, were purified and pretreated with the same procedure for volumetric hydrogen adsorption/desorption measurements. It was found that the hydrogen storage capacity of the purified and pretreated MWNTs was proportional...
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