Direct verification of incipient mechanochemical interaction between two metallic species mediated by OH groups

M. Senna, T. Watanabe, Tetsuhiko Isobe

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Incipient chemical interaction between Ca(OH)2 and SiO2 at the contact point of dissimilar solid particles under mechanical stress was examined by X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), solid state nuclear magnetic resonance (NMR), as well as conventional analytical tools. Rapid electronical interaction in the presence of active OH groups was detected by XPS as a chemical shift of the binding energy of Si2p and Ca2p electrons. Detailed analysis of FT-IR with H-D exchange and preadsorption treatments by pyridine and NH3 proved to be a versatile tool to show that acid-base reaction is the main mechanism of Si-O-Ca complex formation. Appearance and survival of strong Brønsted acid site confirmed by IR also demonstrates the formation of Si-O-Ca bonds. 1H-solid state NMR evidenced the increase in the acidity by polarization of the OH groups during milling. A radical mechanism, examined by EPR, also plays a significant role in the incipient interaction, together with above-mentioned electron pair mechanism.

Original languageEnglish
Pages (from-to)521-526
Number of pages6
JournalMaterials Science Forum
Volume225-227
Issue numberPART 1
Publication statusPublished - 1996

Fingerprint

Paramagnetic resonance
electron paramagnetic resonance
X ray photoelectron spectroscopy
Nuclear magnetic resonance
photoelectron spectroscopy
solid state
nuclear magnetic resonance
acids
Acids
Electrons
Point contacts
Chemical shift
interactions
Binding energy
Acidity
acidity
Pyridine
chemical equilibrium
pyridines
electrons

Keywords

  • Acid-Base Reaction
  • Mechanochemical Interaction
  • OH Groups
  • Radical Mechanism
  • Solid State NMR

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Direct verification of incipient mechanochemical interaction between two metallic species mediated by OH groups. / Senna, M.; Watanabe, T.; Isobe, Tetsuhiko.

In: Materials Science Forum, Vol. 225-227, No. PART 1, 1996, p. 521-526.

Research output: Contribution to journalArticle

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