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.

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.

NH3-assisted synthesis of microporous silicon oxycarbonitride ceramics from preceramic polymers: a combined N2 and CO2 adsorption and small angle X-ray scattering study

2015 ◽  
Vol 3 (2) ◽  
pp. 805-818 ◽  
Author(s):  
Cristina Schitco ◽  
Mahdi Seifollahi Bazarjani ◽  
Ralf Riedel ◽  
Aleksander Gurlo
Keyword(s):  
Small Angle ◽  
Gas Adsorption ◽  
Co2 Adsorption ◽  
X Ray ◽  
Preceramic Polymers ◽  
X Ray Scattering ◽  
Synthesis Strategy ◽  
Potential Applications ◽  
Scattering Study ◽  
Silicon Oxycarbonitride

The NH3-assisted synthesis strategy from preceramic polymers provides tools to engineer the porosity of microporous SiCNO ceramics for potential applications in the fields of catalysis, gas adsorption and gas separation.

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

scholarly journals Resonant x-ray scattering in 3d-transition-metal oxides: Anisotropy and charge orderings

2009 ◽  
Vol 190 ◽  
pp. 012085 ◽  
Author(s):  
G Subías ◽  
J García ◽  
J Blasco ◽  
J Herrero-Martín ◽  
M C Sánchez
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
X Ray ◽  
X Ray Scattering ◽  
Charge Orderings ◽  
Ray Scattering

Microstructure - Stress - Property Relationships in Nanometer Ge/C Multilayers

1994 ◽  
Vol 343 ◽  
Author(s):  
Xiang Lu ◽  
Tai D. Nguyen ◽  
James H. Underwood
Keyword(s):  
Stress Measurement ◽  
Measurement Techniques ◽  
Normal Incidence ◽  
X Ray ◽  
X Ray Scattering ◽  
Transmission Electron ◽  
Evolution Path ◽  
Layer Structures ◽  
Potential Applications ◽  
Ray Scattering

ABSTRACTA series of sputtered as-prepared and annealed Ge/C multilayer structures with periods ranging from 2 to 8 nm has been studied with high resolution transmission electron microscopy (HRTEM), x-ray scattering, and stress measurement techniques. Ge/C multilayers have potential applications as normal incidence reflective mirrors near 4.4 nm wavelength. The reflectivity and stress in these structures depend on the microstructural evolution of the component layers. The as-prepared structure of both Ge and C layers appear amorphous from TEM imaging and diffraction. Annealing at 500°C for 60 minutes leads to crystallization of the Ge layers. As the phase diagram indicates, no carbide compound has been found. X-ray scattering reveals that the multilayer period expands by as much as 10% after annealing. Both TEM images and x-ray profiles suggest that the layer structures remain well-defined upon annealing. In-situ stress-temperature measurements directly show the Ge/C multilayer microstructure evolution path. X-ray measurements show that the structures with periods near 2 nm undergo a significant improvement on optical performance with annealing. The physical mechanisms that may have caused the optical enhancement are discussed. Correlation of the stress evolution in the multilayers and in individual layers during annealing, and their relationships to the microstructures and optical properties are examined.

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

Effects of Different Purification Methods on Chicken Feather Keratin

2014 ◽  
Vol 941-944 ◽  
pp. 1184-1187 ◽  
Author(s):  
Firoozeh Pourjavaheri ◽  
Farzad Mohaddes ◽  
Robert A. Shanks ◽  
Michael Czajka ◽  
Arun Gupta
Keyword(s):  
Soxhlet Extraction ◽  
Sodium Chlorite ◽  
Wide Angle ◽  
Feather Meal ◽  
X Ray ◽  
Chicken Feathers ◽  
X Ray Scattering ◽  
Potential Applications ◽  
Purification Methods ◽  
Biological Organisms

Every year billion kilograms of unused feathers result from the poultry industry worldwide, which in effect impose a difficult disposal process to the environment. Chicken feathers are considered as a valuable and renewable keratin protein source, which could be used advantageously in a number of applications as alternatives to feather meal and feather disposal. Although the potential applications of keratin derived from chicken feathers have been investigated, the initial purification phase has not been fully described in the literature. Original chicken feathers contain many biological organisms along with other contaminants after plucking. Unprocessed chicken feathers are considered as potentially hazardous biological materials due to the presence of blood borne pathogens; therefore, the decontamination process is very important. The purpose of this work is to compare the effects of different purification techniques on chicken feathers prior to keratin isolation. These processes include surfactant washing, soxhlet extraction with ethanol, ozone, and sodium chlorite solutions. Thermogravimetric analysis, vibrational spectroscopy, and wide angle X-ray scattering were used to characterise the purified feathers prior to keratin extraction.

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