Materials Literature
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Abstract The radiation-induced coloration of bulk amorphous films of five photochromic diarylethenes was studied with the aim of developing reusable, sensitive color dosimeters. The films contain an extremely high concentration of diarylethenes. The most intense coloration was observed for the film containing 1,2-bis(…
Four samples of bakerite, Ca 4 B 5 Si 3 O 15 (OH) 5 , were studied by means of IR, TG/DSC, EPMA, and X-ray and neutron diffraction. Chemical analyses can readily discriminate bakerite from datolite, Ca 4 B 4 Si 4 O 16 (OH) 4 , by the distinctly lower SiO 2 content of the former. The Rietveld refinement of the combined…
A new persistent yellow-emitting phosphor CaGa 2 S 4 :Eu 2+ , Ho 3+ was prepared by a solid-state method. The luminescence properties, including thermoluminescence (TL) glow curve and its spectral decomposition, as well as the long decay time curve, were studied. The results revealed that a new trapping level with a s…
Saturated waxy fatty acids (WFAc, 3b) and waxy fatty alcohols (WFAl, 4) were isolated from sugar cane wax. The former were used for the synthesis of the corrosion inhibitors 1-(2-aminoethyl)-(1c) and 1-(2-hydroxyethyl)-2-alkyl-2-imidazolines (1d), and the later were used to prepare waxy phosphate esters (WPE, 6). The…
The objective of the study was to determine the mechanisms of Ni retention in a calcareous soil by comparing the sorption kinetics and adsorption-desorption isotherms of the whole soil and of some of its fractions. The study was performed using diffractometric, microscopic, and thermogravimetric techniques to corrobor…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
The alignment and optical properties of ferroelectric liquid crystal cells, having alignment films of a chalcone-based side chain polymer treated by linearly polarized UV irradiation were investigated. The long absorption band of the UV/Vis spectra gradually decreased and the FTIR spectra shifted as the irradiation ti…
In this article, we describe the improvement in cold emission characteristics of a device termed HEED (high efficiency electro-emission device) by optimizing the emission site structures. The advanced HEED consists of a bottom electrode, a Si layer, a SiOx layer, a top electrode, and a carbon layer. The electron emiss…
New polymeric precursors suitable to form boron containing silicon oxycarbide glass were synthesized by the hydroboration reaction of 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane with borane dimethylsulphide. The obtained polymers denoted as poly(organoborosiloxanes) were characterized by elemental analysi…
Abstract Summary: Using the bond fluctuation model (BFM), simulations have been performed on molecular bottle brushes with two chemically different types of side chains. In the first part of this work, rigidity of the backbone is imposed. The influence of solvent quality and side chain length on the intramolecular pha…
Microencapsulation of acetaminophen in poly(L-lactide) was studied using the oil-in-water emulsification solvent-evaporation technique. Methylene chloride was used as the dispersed medium and water as the dispersing medium. The thermogravimetric analysis and differential scanning calorimetry data indicated that the ac…
Abstract Summary: The influence of number‐average molecular weight $\overline M _{\rm n}$ ranging from 1.4 · 10 4 to 1.2 · 10 6 g/mol on the thermal behaviour of polytetrafluoroethylene (PTFE) has been studied. Samples have been prepared by radiation‐induced degradation of commercial PTFE. The molecular weight $\overl…
Using a conventional RF magnetron sputtering system, we have obtained two types of ZnO films on various kinds of substrate. One is a film with the c -axes of crystallites unidirectionally aligned in the substrate plane {(112̄0) textured film}. The other is a film with c -axes parallel and perpendicular to the plane (m…
Tungsten oxide whiskers were prepared on a tungsten thin film by oxidation with H2O and a subsequent annealing treatment at a temperature of over 900 °C in a vacuum. The tungsten oxide formed by oxidation was transformed into smooth, straight whiskers with a monoclinic-crystalline structure after the vacuum annealing…
Abstract Crosslinked spherical nanoparticles based on trimethoxysilane monomers have been prepared by polycondensation in aqueous emulsion. These particles have been labeled chemically at their surface region with two different types of organic dye molecules (cinnamate, coumarin), which both are well known for their a…
An integrated CO2 corrosion - multiphase flow model was built which takes into account the effect of most important variables. The model is mechanistic in nature and resides on clear theoretical foundations. All the assumptions in the model are explicitly stated and are open to future adjustments and improvements.The…
Phenomenological similarities between the temperature dependence of the thermal and transport properties of supercooled liquids and certain crystalline fast-ion conductors are explored, using information from computer simulations and experiments. The similarities include non-Arrhenius temperature dependence of the tra…
Structural investigations of bare and surface-modified polystyrene microspheres (beads) have been carried out by infrared-visible sum frequency generation (SFG) vibrational spectroscopy and scanning force microscopy (SFM). Bead surfaces have been modified by either the covalent linking of immunoglobulin G (IgG) and bo…
Diamond particles were coated with a thin SiC layer by the reaction of SiO vapor with diamond, and the growth mechanism of SiC as well as the oxidation resistance of the SiC‐coated diamond were studied. The growth process of the SiC layer can be separated into two steps. In the first step, a thin layer of SiC with a t…
Abstract Summary: An in‐situ microfibrillar blend based on poly(ethylene terephthalate) (PET) and polyethylene (PE) was fabricated through slit die extrusion, hot‐stretching and quenching. The morphology of the PET in‐situ microfibers, which were observed after the matrix was etched away, appears to be dependent on th…