Mechanisms of incipient chemical reaction between Ca(OH)2 and SiO2 under moderate mechanical stressing II: Examination of a radical mechanism by an EPR study

Tomoyuki Watanabe; Tetsuhiko Isobe; Mamoru Senna

doi:10.1006/jssc.1996.0115

Mechanisms of incipient chemical reaction between Ca(OH)₂ and SiO₂ under moderate mechanical stressing II: Examination of a radical mechanism by an EPR study

Tomoyuki Watanabe, Tetsuhiko Isobe, Mamoru Senna

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

An EPR spectroscopy was examined in detail in order to elucidate the role of mechanically induced radicals on the incipient mechanochemical reaction between Ca(OH)₂ and SiO₂. The specific radical species found on separately milled Ca(OH)₂ and SiO₂ disappeared in the case of mixed milling. O^- radicals on Ca(OH)₂ and E′centers on the SiO₂ surface reacted during milling, leading to a precursor of complex oxide with Si-O-Ca bonding. Relative contribution of radical mechanism was compared with those of electron pairs to the complex formation of Si-O-Ca under mechanical stressing.

Original language	English
Pages (from-to)	291-296
Number of pages	6
Journal	Journal of Solid State Chemistry
Volume	122
Issue number	2
DOIs	https://doi.org/10.1006/jssc.1996.0115
Publication status	Published - 1996 Mar

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1006/jssc.1996.0115

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abstract = "An EPR spectroscopy was examined in detail in order to elucidate the role of mechanically induced radicals on the incipient mechanochemical reaction between Ca(OH)2 and SiO2. The specific radical species found on separately milled Ca(OH)2 and SiO2 disappeared in the case of mixed milling. O- radicals on Ca(OH)2 and E′centers on the SiO2 surface reacted during milling, leading to a precursor of complex oxide with Si-O-Ca bonding. Relative contribution of radical mechanism was compared with those of electron pairs to the complex formation of Si-O-Ca under mechanical stressing.",

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Mechanisms of incipient chemical reaction between Ca(OH)₂ and SiO₂ under moderate mechanical stressing II: Examination of a radical mechanism by an EPR study

Abstract

ASJC Scopus subject areas

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