X-ray and spectroscopic studies of mechanically treated or irradiated oxides

Steinike, U.; Kretzschmar, U.; Ebert, I.; Hennig, H.‐P.; Barsova, L. I.; Jurik, T. K.

doi:10.1016/0168-7336(87)80084-0

Cited by 27 publications

(8 citation statements)

References 30 publications

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“…It is well known that radicals also play an important role in a mechanochemical reaction (2,8,9). In order to further examine whether and to what extent a radical reaction is concerned, ESR spectroscopy was employed.…”

Section: The Role Of Mechanoradicalsmentioning

confidence: 99%

“…Concentrations of E centers (,Si)) in silica-(8) and oxygen-related radicals, e.g., the F> center and O\, in MgO increase by grinding (9). In our previous report on the system Ca(OH) }SiO (2), oxygen vacancies such as E centers were observed on the surface of separately ground SiO .…”

Section: Introductionmentioning

confidence: 95%

“…The existence of a mechanically induced radical, i.e., a mechanoradical, is widely known for inorganic substances (8,9). Concentrations of E centers (,Si)) in silica-(8) and oxygen-related radicals, e.g., the F> center and O\, in MgO increase by grinding (9).…”

Section: Introductionmentioning

confidence: 99%

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Solid State Radical Recombination and Charge Transfer across the Boundary between Indomethacin and Silica under Mechanical Stress

Watanabe

Hasegawa

Wakiyama

et al. 2002

Journal of Solid State Chemistry

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Section: The Role Of Mechanoradicalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Solid State Radical Recombination and Charge Transfer across the Boundary between Indomethacin and Silica under Mechanical Stress

Watanabe

Hasegawa

Wakiyama

et al. 2002

Journal of Solid State Chemistry

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“…The mechanical activation of silica particles can result in the formation of free radicals at the surface of the particles 1–5. The reactive free radicals may initiate covalent grafting of functional components onto the surface of the silica particles 6–9.…”

Section: Introductionmentioning

confidence: 99%

Production of filled hydrogels by mechanochemically induced polymerization

Damm

Mallembakam

Voronov

2010

J of Applied Polymer Sci

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Silica nanoparticles functionalized with polyvinylpyrrolidone (PVP) were obtained by the grinding/ mechanical activation of quartz or nonfunctionalized silica nanoparticles in a stirred media mill in the presence of 1-vinyl-2-pyrrolidone, as proven by Fourier transform infrared spectroscopy. The polymer layer thickness formed on the silica nanoparticles after 8 h of mechanical activation in the absence of polymerization initiators amounted to about 10 nm, as derived from shear rheology. The silica nanoparticles functionalized with the hydrophilic PVP by mechanochemical polymerization reaction were used as fillers for hydrogels based on poly(hydroxyethyl methacrylate) (polyHEMA). The water absorption, release properties, and mechanical properties of the polyHEMA-silica composites were measured as functions of the filler content and particle size of the filler. PolyHEMA samples containing 20 wt % of the functionalized silica particles exhibited a higher maximum water absorption than the unfilled polymer; this showed that the hydrophilic interface between the filler and the matrix improved the water absorption. The release of methylene blue from the poly-HEMA-silica composites was governed by diffusion and was almost unaffected by the silica particles. The values for the storage modulus and loss modulus of the poly-HEMA-silica composites increased with growing filler content. For constant filler content, the storage modulus increased with decreasing particle diameter of the filler; this showed that the reinforcing effect increased with the interface between the filler particles and the matrix polymer.

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“…The elementary step of the dissolution is influenced by lattice defects, e.g. bond breakings and deformation (WEYL;STEINIKE et al (1982)). Such defects could e.g.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Mechanical Activation of Quartz and Quartz/γ‐Al₂O₃ Mixtures on the Sodium A Zeolite Formation

Wutzler¹,

Klevzov

Steinike³

et al. 1991

Cryst. Res. Technol.

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It could be shown that the preparation of sodium A zeolite is possible by the reaction of quartz and y-A1,03 with NaOH-solution. The zeolite formation is dependent on the mechanical preliminary treatment of quartz. Only the partially crystalline part of quartz dissolves and reacts with Al,O, to form zeolite. The grinding of quartzly-Al,O, mixtures can in certain limits raise the zeolite formation but essentially only influences the kinetics of the zeolite formation.Es konnte gezeigt werden, daD eine Na-A-Zeolithbildung aus Quarz und y-Al,O, durch Umsetzung mit NaOH-Losung erfolgen kann. Die Zeolithbildung ist abhangig von der mechanischen Vorbehandlung des Quarzes. Es wird nur der partiell-kristalline Anteil des Quarzes aufgelost und mit y-Al,O, zu Zeolith umgesetzt. Eine Quarz/y-Al,O, Gemischmahlung kann die Zeolithbildung in bestimmten Grenzen erhohen, beeinflu& aber im wesentlichen nur die Kinetik der Zeolithbildung.

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X-ray and spectroscopic studies of mechanically treated or irradiated oxides

Cited by 27 publications

References 30 publications

Solid State Radical Recombination and Charge Transfer across the Boundary between Indomethacin and Silica under Mechanical Stress

Solid State Radical Recombination and Charge Transfer across the Boundary between Indomethacin and Silica under Mechanical Stress

Production of filled hydrogels by mechanochemically induced polymerization

The Influence of Mechanical Activation of Quartz and Quartz/γ‐Al₂O₃ Mixtures on the Sodium A Zeolite Formation

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X-ray and spectroscopic studies of mechanically treated or irradiated oxides

Cited by 27 publications

References 30 publications

Solid State Radical Recombination and Charge Transfer across the Boundary between Indomethacin and Silica under Mechanical Stress

Solid State Radical Recombination and Charge Transfer across the Boundary between Indomethacin and Silica under Mechanical Stress

Production of filled hydrogels by mechanochemically induced polymerization

The Influence of Mechanical Activation of Quartz and Quartz/γ‐Al2O3 Mixtures on the Sodium A Zeolite Formation

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The Influence of Mechanical Activation of Quartz and Quartz/γ‐Al₂O₃ Mixtures on the Sodium A Zeolite Formation