Morphological and Electronic Characteristics of Nanoalumina Alone and in High-Temperature (Fumed) and Low-Temperature (Mechanical) Mixtures with Nanosilica

  • Ya. V. Zaulychnyy National Technical University of Ukraine «Kyiv Polytechnic Institute»
  • V. Ya. Ilkiv National Technical University of Ukraine «Kyiv Polytechnic Institute»
  • V. I. Zarko Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
  • M. V. Karpetz Frantsevich Institute for Problems of Materials Science of National Academy of Sciences of Ukraine
  • M. V. Pereginiak National Technical University of Ukraine «Kyiv Polytechnic Institute»
  • S. S. Petrovska Frantsevich Institute for Problems of Materials Science of National Academy of Sciences of Ukraine
  • V. M. Gun'ko Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
DOI: https://doi.org/10.15407/hftp05.02.136
Keywords: nanoalumina, nanosilica, electronic structure, ultrasoft X-ray emission spectroscopy, X-ray diffraction

Abstract

Crystalline and electronic structures of nanoalumina alone and in different mixtures with nanosilica have been analyzed using X-ray diffraction (XRD) and ultrasoft X-ray emission spectroscopy (USXES). Narrowing of the OKαbands of crystalline alumina occurs with decreasing nanoparticle size. Electron transfer from oxygen to aluminum atoms due to Al–O bond breakage under irradiation leads to occupation of high-energy 3d level of Al. In nanoparticles, the Al–O bond strength and O–O interactions enhanced by Laplace (bubble) pressure lead to δ phase stabilizing if coherent-scattering region size (dCSR) reaches 7 nm which is smaller than that for θ phase (dCSR = 11–20 nm) of alumina and silica/alumina studied. The dCSR values are in agreement with nanoparticle sizes calculated using self-consistent regularization method applied to nitrogen adsorption data.

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How to Cite
ZAULYCHNYY, Y. V.; ILKIV, V. Y.; ZARKO, V. I.; KARPETZ, M. V.; PEREGINIAK, M. V.; PETROVSKA, S. S.; GUN’KO, V. M. Morphological and Electronic Characteristics of Nanoalumina Alone and in High-Temperature (Fumed) and Low-Temperature (Mechanical) Mixtures with Nanosilica. Chemistry, Physics and Technology of Surface, v. 5, n. 2, p. 136-144, 11.
Issue
Vol. 5 No. 2 (2014): Chemistry, Physics and Technology of Surface / Himia, Fizika ta Tehnologia Poverhni
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