Hydrogen loading

Fig. 1. The structure of gas hydrates containing a hydrogen-bonded frames ovk of 46 water molecules. Twenty mol cutes,. m Tiged at the cornels of a pgntogoafti dodecahedron, 01 10 hydrogen- bonded complex about the corners of the unit cube, and another 20 form similar complex, d erently oriented, about the centre of the cube. In addition there are six hydrogen- loaded water molecules, one of which is cWwn. in the bottom, face of the cube. Xu the proposed structure for water additional water molecules, not forming hydrogen bonds, occupy the centres of the dodecahedra, and...

Daschbach, J. L., Chang, T. M., Corrales, L. R., Dang, L. X., McGrail, P., Molecular mechanisms of hydrogen-loaded beta-hydroquinone clathrate. J. Phys. Chem. B 2006, 110, 17291-17295. 

In this chapter, we attempt to address these fundamental questions by performing extensive molecular dynamics simulations. In previous publications,15,16 we have demonstrated using ab initio molecular dynamics based on local density functional theory that H2 adsorption energies in a lattice of (9,9) armchair SWNT at a variety of temperatures with 0.4 wt. % hydrogen loading are significantly higher than in... 

Figure 10 IQNS spectra measured for a HD confined phase in MCM-41 (0 = 24 A) at T = 14.6 K for a hydrogen loading = 33 %.

The other sample which has been deeply charged during 12 hours gives also this peak, but in addition there is another peak, ca. 200°C, which is attributed to the desorption of the hydrogen loaded in the material. 

Changes in the lEC through hydrogen loading are typically observed by the influence of, for example, the critical temperature or the disappearance or appearance of AFM scattering as in, for example polarized neutron scattering experiments. 

The modified electronic structure of the H-loaded V as compared to the pure metal is not only responsible for the change in the I EC in Fe/V superlattices, it also influences the magnetic moments. SQUID magnetization measurements of hydrogen-loaded Fe/V superlattices show a proportional increase in the saturation moments with the hydrogen concentration after hydrogen loading for all samples. 

Fig. 7.9 Change of the atomic magnetic moment per Fe atom after saturating the samples with hydrogen at different H2 pressures. The hydrogen loading was done at room temperature, the magnetization has been measured at 4.2 K. Taken from Labergerie et al. (2001), Reference [39].

Fig. 7.17 Hysteresis in the p-c isotherms (c) and hydrogen concentration dependence of the electrical resistivity (a) and transmission (b) ofYHy during a hydrogen loading (filled circles) - unloading cycle (open circles). The giant hysteresis (factor 10 ) in...

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