Nanohydrides

A primary method of mechanochemical synthesis of nanostructured hydrides (nanohydrides) is processing by mechanical (ball) milling. Processes of manufacturing of nanocrystalline/nanostructured hydrides by ball milling are shown in Fig. 1.21. 

All of these syntheses are preceded by mechanical activation of reagents in ball mills and aU of them can be considered when mannfacturing of nanohydride powders is anticipated. However, solid-state reaction rontes are not always well investigated, and can be complex. More often than not, the yields of reactions leading to nanohydrides are not reaching 100% and an amorphons phase, which provides lower storage capacity, is formed. 

As discussed in Sect. 1.3, the major objective of mechanical (ball) milling is to obtain a substantial nanostructuring of hydrides (nanohydrides), which in effect can... 

R.A. Vatin, Ch. Chiu, Z. Wronski, A. Calka, The effects of oxidized and oxide-free boron on the Mg-B-H nanohydrides transformation in the nearly nanosized powders . Solid State Phenom. 128 (2007) 47-52. 

Destabilization of high-temperature hydrides by nanostracturing and compositing of nanohydrides (Sect. 3.5) is in its infancy. At the first look, it seems to be very promising but needs much more vigorous research. 

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