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FEATURES OF PHYSICAL AND CHEMICAL ADSORPTION DURING INTERACTION OF POLYCRYSTALLINE AND NANOCRYSTALLINE MATERIALS WITH GASES

† V.Lavrenko,
 
† V.Lavrenko,
 
I.Podchernyaeva,
 
D.Schur,
 
A.Zolotarenko,
 
A.Zolotarenko
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2017, #09/10
http://www.materials.kiev.ua/article/2427

Abstract

Diborides of group IV metals (Mendeleev periodic system) are considered in the context of the features of two types of adsorption (physical and chemical) during interaction of polycrystalline and nanocrystal materials (carbon nanotubes, high-dispersive iron powder etc.) with gases (CО2, H2O). Due to Raman spectroscopy method, it is established that, in the case of adsorption, only the chemical adsorption with typical minimal distance between absorbed gas molecule and adsorbing agent surface occurs at the surfaces of all synthesized nanoparticles. It is confirmed that the reference Raman spectrum of the correspondent nanoparticles (according to the Hirsch reference book) remains for all cases. The physical adsorption of oxygen and nitrogen during oxidation of diborides of group IV transition metals is investigated.


BORIDES OF TRANSITION METALS, CARBON NANOTUBES, CHEMICAL ADSORPTION, DISTORTION OF THE ELECTRON SHELL OF SURFACE ATOMS, IRON NANOPOWDERS, PHYSICAL ADSORPTION, RAMAN SCATTERING SPECTROSCOPY

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