Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"JOSEF. ZEMEK"

Detection of surface hydrogen in selected carbon materials by elastic peak electron spectroscopy

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The problem of bulk and surface hydrogen is important in many technological applications, like hydrogen storage in new energy sources, catalysis for selected heterogeneous reactions or preparation of pure carbon materials. The hydrogen storage technology is an important factor of hydrogen fuelled transportation, energetically and economically. As a pollutionfree energy resource, hydrogen has attracted much attention in materials, physical and chemical science [1]. The methods of bulk hydrogen detection involve nuclear reaction analysis (NRA), nuclear magnetic resonance (NMR), infrared spectroscopy (IR), secondary ion mass spectroscopy (SIMS), thermal desorption (TD), etc. [2]. The surface hydrogen can be quantified using also methods based on the quasi-elastic scattering effec[...]

Chemical state of potassium in electron irradiated silicate glasses

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The alkali oxide silicate glasses are technologically interesting due to many possible industrial applications. Surfaces of such silicate glasses under electron irradiation have often been studied since this field of interest is related to the nuclear waste disposal and glass modification for producing electron beam and corrosion resistant materials. Different silicate glasses, such as potassium silicate, sodium-potassium silicate, potassium lime, sodium-potassium-aluminium silicate and alkali ions (Na, K, Rh and Cs) silicate glasses have been recently investigated using X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES) and electron microprobe analysis under varying conditions of electron beam irradiation [1-8]. It has been shown that the electron beam c[...]

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