Biomedical Engineering Reference
In-Depth Information
modes inherent in the C-H bond, and causes in the majority of cases
a sharp increase (up to 40%) in the interplanar spacing between the
graphene layers (for GNF samples). The structural reflections in the
diffraction patterns of single-wall nanotube samples are obviously
caused by the presence of carbon multilayer nanoparticles (up to
40-50 wt%), which are graphitized under thermobaric treatment and
participate in the sorption and adsorption of hydrogen.
Figure 2.19
IR diffuse reflection spectra of GNF and single-wall nano-
tube samples [94] in the initial state, after saturation with
hydrogen at 9 GPa, after removal of about 40% of the
adsorbate (hydrogen) and after degassing annealing. Room
temperature.
relates to the physical adsorption of
hydrogen molecules on graphene layers; that is why the authors refer,
without a sufficient analysis, to the results in Ref. [85], which have
been discussed in the previous section. They also relate process
In Ref. [94], process
α
β
to
