Radiothermoluminescence of Oxide Nanostructures on Surfaces of Radiation-Oxidized Aluminum and Beryllium

IR-Spectroscopy of Radiation- Stimulated Processes of Adsorption, Radiolysis, and Hydrogenation on the Surface of Metals in Contact with Hydrocarbons

“…The observed absorption bands seem to refer to stretching vibrations of the C▬H bonds of the fragments CH 3 , C 2 H 5 , etc., associated with beryllium (beryllium alkyls) [14,15]. The dissociative adsorption is also confirmed by the appearance in the IR spectrum in the 2000-1700 cm −1 region of bands with frequencies of 1790 and 1740 cm −1 , which relate to the Be▬H bonds of surface beryllium hydrides [14,15]. The kinetic curves of radiation-stimulated adsorption of n-hexane on the beryllium surface have also been studied in [14] (Figure 4).…”

“…According to the chromatographic analysis, the total radiation-chemical yield of hydrocarbons ΣG(C 1 -C 5 ) is 0.28 molecule/100 eV. The kinetic regularity of the accumulation of molecular hydrogen in the radiolysis of n-hexane in the system Be/ads.n-C 6 H 14 [14,15] has been studied. Based on the kinetic curve of H 2 accumulation, the rate of the radiative formation of H 2 is determined and its activation energy is calculated, which is E a ≈ 4.5 kC/mol.…”

“…Most metals are usually characterized by the presence of thin protective oxide films on their surface, the passivation of which is disturbed under the condition of increased radiation. This leads to a change in the surface state of metals and significantly affects the course of radiation-heterogeneous processes of paraffin decomposition [5][6][7][8][9][10][11][12][13][14][15][16][17]. In the nanostructured surface of metals, the mechanisms and rates of radiation-chemical transformations change-local charges and their distribution, ionization energies and electron affinity, conformations and reactivity; new "forced" reactions appear; and many other anomalies are found [34][35].…”

“…Complexes with the greatest reactivity play the role of active centers in heterogeneous catalysis [35]. The presence of such complexes on the surface of Al in the initial stages of its oxidation is confirmed by the registration of multiquantum vibrational transitions of oxygen clusters using scanning tunneling microscopy and topographic images [35], as well as the results of RTL studies [15,17]. Depending on the size and shape of the oxygen nanoclusters, the specific surface energy of aluminum also changes [38].…”

“…In fact, there are no data on the radiation-chemical decomposition of hydrocarbons on the surface of metals and the radiation hydrogenation of these surfaces under the influence of gamma radiation. This chapter presents the results of work on IR spectroscopic studies of radiation-stimulated heterogeneous processes of adsorption, radiolysis, and hydrogenation on the surface of metals in contact with hydrocarbons [5][6][7][8][9][10][11][12][13][14][15][16][17].…”