Poly(ethyleneimine) and poly(4-vinylpyridine) chains adsorbed on Nucleosil silica have been randomly labeled with nitroxide free radicals. The EPR signal is very sensitive to the molecular Brownian motion of the segments and shows generally at least two different environments: trains adsorbed on the
NMR spin echo studies on mobility and diffusion of benzene adsorbed on silica
β Scribed by B Boddenberg; R Haul; G Oppermann
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 566 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0021-9797
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π SIMILAR VOLUMES
Molecular self-diffusion is studied for several probe molecules in a sample series of Merck silica gels. The fractal interpretation of the pore size distributions from \(\mathrm{N}_{2}\) desorption measurements indicate that both the micro- and mesopore regions can be described as fractal regions. B
The adsorption mechanism of silane coupling agent on the colloidal silica surface is studied with spin-labeled silane coupling agent using ESR method. The density of the adsorbed silane molecules was determined to be approximately 1.5-2 molecules per 100 A of the silica surface in 95% ethanol soluti