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

M. Senna, T. Watanabe, T. 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
DOIs
Publication statusPublished - 1996 Jan 1

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Direct verification of incipient mechanochemical interaction between two metallic species mediated by OH groups'. Together they form a unique fingerprint.

  • Cite this