نتایج جستجو برای: thermal oxidation
تعداد نتایج: 330290 فیلتر نتایج به سال:
Color changes of wood during natural aging and during heat treatment were elucidated to determine whether they could be explained as the result of a mild thermal oxidation process at ambient temperatures. The results of kinetic analysis employing the time-temperature superposition method showed that the color changes during natural aging were mainly the result of an oxidation process. Color cha...
We have successfully prepared E-guggulsterone from 16,17-epoxypregnenolone in 84% yield over two steps via a hydrazine reduction and Oppenhauer oxidation. Additionally, isomerization was induced by heat, light (hν) and acid catalysis to convert Eguggulsterone into the corresponding Z isomer.
This review summarizes the history and most recent advances in aptamers and ribozymes that bind and use redox(reduction–oxidation) cofactors. Redox reactions, catalyzed by protein enzymes in an extant world, play a central role in the metabolism of numerous biological molecules in the living organisms. The burden of catalyzing these reactions in a preprotein-based world (i.e., the hypothesized ...
Ageing and stabilization polymers is a major part of materials science. Aging of polymers defined as a set of chemical and physical transformations, leads to the loss of their set the desired properties. The main role in these transformations belong to chemical processes of degradation and crosslinking of macromolecules. Processes decomposition and structuring polymer conjugates include radical...
Corrosion behavior of Ti-5Ag alloy with and without thermal oxidation in artificial saliva solution.
OBJECTIVES The aim of the present study was to investigate the effect of thermal oxidation on the corrosion behavior of Ti-5Ag alloy. METHODS The microstructure of Ti-5Ag alloy without and with thermal oxidization treatment were characterized, with commercial pure (CP) Ti as control, by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (...
Abstract Aluminum nanoparticles are widely used in various energetic materials, such as pyrotechnics, explosives and propellants.In this research, the thermal behavior of aluminum nanoparticles (prepared by inert gas condensation process) and aluminum microparticles is investigated. The synthesis particles were characterized using Scanning Electron Microscopy (SEM), Particle Size Analysis (...
conventional and nanostructured ysz coatings were deposited on the in-738 ni super alloy by the atmospheric plasma spray technique. the oxidation was measured at 1100°c in an atmospheric electrical furnace. according to the experimental results the nanostructured coatings showed a better oxidation resistance than the conventional ones. the improved oxidation resistance of the nanocoating could ...
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