Electron Microscopic Investigation of the Structure of Gas-Sensitive Nanocomposites Prepared by the Hydropyrolytic Method

Polycrystalline films in the SnO₂–In₂O₃ and SnO₂–ZnO systems, which are of interest for use in gas-sensitive sensors, are grown from metal chlorides on a 22-XC ceramic substrate by the hydropyrolytic method. The nanocomposites based on tin dioxide are studied. The structure of polycrystalline grains is investigated by electron spectroscopy and X-ray diffractometry. The distribution of components in the samples prepared is examined using electron probe X-ray microanalysis. It is established that homogeneous films in the SnO₂–In₂O₃ system up to 10 mol % In₂O₃ in the initial solution can be grown by the hydropyrolytic method.     

Transportation operations model analysis for removal of stranded fuel from shutdown reactors

The transportation operations model was used to identify options for removing stranded fuel currently in dry storage at nine shutdown reactor sites to a hypothetical consolidated storage facility. The logistical variables included the campaign duration, fuel selection priority, consist size and location of the consolidated storage and maintenance facilities. The major factors affecting the logistics of fuel removal were identified. Recommendations for optimal strategies for the transport of stranded fuel from shutdown sites are made.     

Calibration measurements of the characteristics of tracks from superheavy nuclei in olivine crystals from meteorites

To identify the charge of detected cosmic ray nuclei, it is necessary that the dynamic and geometric parameters of tracks (the etching rate of a nuclear track, as well as the length and the diameter of the track channel) be determined with a high accuracy. Results of the experimental investigations of tracks produced in olivine crystals from the Marjalahti pallasite by accelerated Xe and U nuclei are presented. These investigations were performed as part of the Olimpiya project. It is shown that the etching rate and the fully etched track length are independent of the track orientation relative to the crystallographic symmetry axes of each olivine crystal under investigation.     

Variation of inhibited oxidation parameters in the range of phase transition

Parameters of inhibited oxidation of isotactic propylene containing antioxidant 2,2′‐methylene‐bis(4‐methyl‐6‐tertbutylphenol) have been studied in the temperature range 140–210°C. Unlike polyethylene, the dependencies of inhibited oxidation parameters of critical antioxidant concentration and of rate constant of antioxidant consumption change with temperature do not obey Arrhenius law both below and above the melting temperature. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 2711–2713, 2007     

Effect of Phenols on Biological Zinc Corrosion

Protection of Metals and Physical Chemistry of Surfaces - It has been shown that treating a zinc surface with phenols (phenol, 2,6-di-tert-butyl-4-methylphenol (ionol), hydroquinone, pyrocatechol,...     

Weibull-Gnedenko Distribution Parameters for Mechanical Characteristics of Single Aramid Arn Filaments After Treatment with Low-Concentration Carbon Nanotube Suspension

Fibre Chemistry - Weibull-Gnedenko distribution parameters for single filaments of copolymeric para-aramid fiber after treatment of its surface with a low-concentration aqueous suspension of...     

Synthesis of transparent and thermally stable polyimide-aramid nanocomposites – Prospective materials for high-temperature electronic manufacture applications

Herein we report a method that improves the optical properties of polyimide-aramid (PIA) by the addition of a large quantity of silica. High silica loading was successful due to the good compatibility of synthesized unique silane end-capped polyimide-aramid (PIA) with in-situ formed silica nanoparticles. The prepared polymer films exhibited excellent optical properties, stability at 400 °C, a high decomposition and glass transition temperature, and a relatively low coefficient of thermal expansion (CTE) close to that of a glass substrate. These films may have potential applications in high-temperature (over 400 °C) electronic and optoelectronic manufacturing processes as a flexible transparent substrate.     

Ceramic nanocomposites based on oxides of transition metals for ionistors

Low-temperature synthesis methods are used to produce nanoceramic materials for electrodes of the following ionistors: (ZrO₂)_0.6(In₂O₃)_0.4, praseodymium cobaltite, as well as neodymium, lanthanum, and nickel chromites; they operate in the presence of an ion-conducting phosphorosilicate separator membrane and phosphate impregnation. Film electrodes of ionistors are fabricated that consist of nanocrystalline oxide materials deposited as a thin film on a porous electroconductive metal substrate, i.e., foamed nickel. The MnO₂-foamed nickel electrode has a specific capacity of 45.0 F g^?1, which is compared with that of industrial supercapacitors.