Highly dispersed graphite

Different nano-objects can be synthesized under changes of the regime of synthesis and application of catalysts. In the course of synthesis the foamy particles (Fig. 8) are formed during the evaporation of highly dispersed graphite dust. Then-conglomerates range up to 1-5 pm. 

A major obstacle is related to the anode material. The active component in the anode is a highly dispersed metal supported on graphite that is pressed against the membrane. Platinum is chosen as the active metal because of its efficiency in dissociating hydrogen, but, unfortunately, platinum is also very sensitive towards trace amounts of impurities (e.g. CO) in the hydrogen gas. 

Oxidation of Highly Dispersed Platinum on Graphite Catalysts in Gaseous and Aqueous Media... 

Catalyst. A highly dispersed platinum on graphite catalyst was prepared following a method described by Richard and Gallezot 20). 

Nickel-Graphite. A highly dispersed nickel on graphite (Ni-Gr 1) is obtained by reduction of NiBr2 2DME dissolved in THF HMPT (15 1) with CSK (2 equiv.) at 20° under argon. This material is slowly oxidized by air to give a less active metal (Ni-Gr 2), which can be stored for several months. 

At metallographic research of structure melted of sites 2 mechanisms of education of spherical particles of free carbon are revealed. In one of them, sold directly at the deformed graphite the formed particles became covered by a film austenite, that testifies to development abnormal eutectic crystallization. In other sites containing less of carbons and cooled less intensively, eutectic crystallization the education numerous dispersed dendrites austenite preceded. Crystallization of thin layers smelt, placed between branches austenite, occured to complete division of phases, that on an example of other materials was analyzed in job [5], Thus eutectic austenite strated on dendrites superfluous austenite, and the spherical inclusions of free carbon grew in smelt in absence austenite of an environment. Because of high-density graphite-similar precipitates in interdendritic sites the pig-iron is characterized by low mechanical properties. 

The higher-frequency iTO-i-LA combination mode is highly dispersive and up shifts from 1864 to 2000 cm as El varies from 1.58 to 2.71 eV [68]. This feature can be assigned as a combination mode not seen in graphite, but enhanced by the q = 2k double-resonance process. The experimental dispersion of this feature is shown in Fig. 7.5a. Figure 7.5b demonstrates the relation of this mode dispersion to phonon branches in 2D graphite [3]. 

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