Carbon‐13 hyperfine splittings of normal and abnormal methyl radicals trapped on the porous Vycor glass surface

1974 ◽  
Vol 61 (10) ◽  
pp. 4307-4311 ◽  
Author(s):  
Yuzaburo Fujita ◽  
Takashi Katsu ◽  
Mitsuo Sato ◽  
Kazumasa Takahashi
Keyword(s):  
Glass Surface ◽  
Methyl Radicals ◽  
Vycor Glass ◽  
Porous Vycor Glass ◽  
Hyperfine Splittings

scholarly journals An ESR Study of Methylamino Radicals Photoproduced on the Porous Vycor Glass Surface

1974 ◽  
Vol 47 (1) ◽  
pp. 4-8 ◽  
Author(s):  
Keiichiro Hatano ◽  
Norio Shimamoto ◽  
Takashi Katsu ◽  
Yuzaburo Fujita
Keyword(s):  
Glass Surface ◽  
Vycor Glass ◽  
Porous Vycor Glass

ChemInform Abstract: AN ESR STUDY OF METHYLAMINO RADICALS PHOTOPRODUCED ON THE POROUS VYCOR GLASS SURFACE

1974 ◽  
Vol 5 (37) ◽  
Author(s):  
KEIICHIRO HATANO ◽  
NORIO SHIMAMOTO ◽  
TAKASHI KATSU ◽  
YUZABURO FUJITA
Keyword(s):  
Glass Surface ◽  
Vycor Glass ◽  
Porous Vycor Glass

The Effect of Metal Impregnation on the Microstructure of Porous Vycor Glass

1989 ◽  
Vol 168 ◽  
Author(s):  
D. Sunil ◽  
J. Sokolov ◽  
M. H. Rafailovich ◽  
E. Mendoza ◽  
E. Wolkow ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Glass Surface ◽  
Vycor Glass ◽  
X Ray ◽  
X Ray Scattering ◽  
Porous Vycor Glass ◽  
Potential Applications ◽  
Material Refractive Index ◽  
Metal Impregnation ◽  
Particulate Distribution

It has recently been demonstrated that highly resolved images can be produced by photochemical deposition of metal oxides in porous Vycor glass. This process has potential applications to the development of integrated optics in glass since it enables one to deposit in the same material refractive index patterns of optically and electro-magnetically active adsorbates. In order to learn in more detail about the interaction of the metal oxides with the glass, we impregnated porous Vycor glass (PVC) with tin or iron oxides and analyzed the samples with electron microscopy, x-ray microprobe analysis, and small angle x-ray scattering (SAXS). The results indicate that even though both oxides produce images of comparable resolution (approx 1μ), the interaction with the glass surface and particulate distribution is different for the two oxides. In particular, the Sn oxide appears to chemically modify the glass surface and prevents its consolidation.

Photoluminescence of a Porous Vycor Glass; Surface-Enhanced Photocatalyzed Conversion of CO2 to CH4

2019 ◽  
Vol 123 (11) ◽  
pp. 6464-6476
Author(s):  
Robert L. Neuweiler ◽  
Edward G. Look ◽  
Luat T. Vuong ◽  
Harry D. Gafney
Keyword(s):  
Glass Surface ◽  
Vycor Glass ◽  
Porous Vycor Glass ◽  
Surface Enhanced

Electron spin resonance studies of methyl radicals stabilized on porous VYCOR glass: various surface interactions, second-order splitting, and a linewidth temperature study

1970 ◽  
Vol 48 (17) ◽  
pp. 2685-2694 ◽  
Author(s):  
G. B. Garbutt ◽  
H. D. Gesser
Keyword(s):  
Electron Spin Resonance ◽  
High Temperature ◽  
Electron Spin ◽  
Second Order ◽  
Methyl Radicals ◽  
Methyl Radical ◽  
Potential Wells ◽  
Vycor Glass ◽  
Porous Vycor Glass ◽  
Spin Resonance

Electron spin resonance studies have been performed on methyl radicals stabilized on the surface of porous VYCOR glass. As previously reported, two very different methyl radicals, denoted Me and Me′, were seen. Results indicate that the radical Me′ is most probably weakly bound to the boroxane group (=B—O—B=) which is prominent on the surface of high temperature (700–900 °C) pretreated porous VYCOR glass. Four satellite lines about each Me line, denoted previously as radical X, were observed when the surface was pretreated at lower temperatures (400–500 °C). In an earlier publication radical X was attributed to the interaction between methyl radicals and the isotopic surface species 11B. In this study two additional satellite lines about each Me line are reported as well as a reassignment of the origin of all satellite lines. Four of the six satellite lines have been assigned to forbidden "spin–flip" transitions while the other two have been assigned to direct interaction between methyl radicals and the surface hydroxyl protons. Support for the irreversibility of high temperature dehydroxylation of porous VYCOR glass is also presented.A partial resolution of the second-order splitting of each of the central pair of lines was achieved for the normal methyl radical. The value of the second-order splitting was between 220 and 230 mG. The linewidths of the two central lines were measured at 77 °K. The samples were then allowed to warm up to various temperatures and then recooled to 77 °K. The linewidths were smaller after completing this cycle. Storage of the sample at 77 °K allowed the linewidths to return to their original values. These linewidths effects are explained by postulating the existence of two different types of potential wells on the surface.

scholarly journals Thermal properties of metal-metal bonded Pd(I) complexes supported onto porous Vycor glass

2008 ◽  
Vol 80 (2) ◽  
pp. 263-269
Author(s):  
Iara F. Gimenez ◽  
Oswaldo L. Alves
Keyword(s):  
Solid State ◽  
Thermal Stabilization ◽  
Decomposition Products ◽  
Vycor Glass ◽  
X Ray ◽  
Porous Vycor Glass ◽  
Metal Metal ◽  
Condensed Phosphates ◽  
Diffuse Reflectance Infrared ◽  
Immobilized Complexes

Thermal behavior of the complexes Pd2(dppm)2Cl2, Pd2(dppm)2(SnCl3)Cl and Pd2(dppm)2(SnCl3)2 (dppm = bis[diphenylphosphino(methane)], ((C6H5)2PCH2P(C6H5)2) in the solid state and immobilized onto porous Vycor glass was studied. Similar decomposition mechanisms were observed for the solid and immobilized complexes, with a small thermal stabilization upon immobilization. The decomposition products were characterized by X-ray diffractometry, Raman and diffuse reflectance infrared spectroscopy, which indicated the presence of a mixture of metallic palladium and oxidized species such as PdO,condensed phosphates, SnO2 and SnP2O7. According to X-ray diffractometry, the decomposition products of the immobilized complexes presented higher amounts of PdO than the solid-state residues, probably as an effect of interactions with silanol groups present in the glass surface.

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