Materials Literature
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The discovery of carbon nanotubes (CNTs) created much excitement and stimulated extensive research into the properties of nanometer-scale cylindrical networks. From then on, various methods for the synthesis and characterization of aligned CNTs-both single-walled (SWCNTs) and multi-walled (MWCNTs) by different methods…
Abstract Investment casting offers high‐quality castings with good dimensional accuracy, being therefore suitable for aircraft applications. Since commercial ceramic shells react with Mg melts and appropriate inhibitors being not available, magnesium alloys are not widely used in industrial investment‐casting. In orde…
Optical spectroscopy and volume “swelling” measurements were used to study radiation damage and graphitization of diamonds implanted with helium ions at temperatures from 77 to 373 K. It is established that the radiation damage decreases as the implantation temperature increases. This effect is explained by radiation-…
An analytic formulation dedicated to the design of high-frequency power transformers is presented. This approach is based on the area product, and homothetic core shapes are considered. The temperature increase of the transformer is one of the main input data. Winding losses including the effect of eddy currents are c…
We study the spatiotemporal dynamics of spatially extended nonlinear cavities containing a left-handed material. Such materials, which have a negative index of refraction, have been experimentally demonstrated recently, and allow for novel electromagnetic behavior. We show that the insertion of a left-handed material…
Palladium catalysts based on Siralox and AS aluminosilicate supports for the deep oxidation of methane were studied. With the use of XRD analysis, it was found that they were heterophase systems consisting of an amorphous aluminosilicate and γ-Al2O3 stabilized against agglomeration. It was found that the catalytic act…
Electrospun nanofiber surfaces are modified with proteins to control protein release. A mixture of poly(ε-caprolactone) (PCL) and PCL—PEG block copolymers is electrospun to prepare amine-terminated block copolymers. The amount of surface exposed amine groups increases as the blend ratio of block copolymer increases. C…
Hydrides of LaFe11.57Si1.43 intermetallic compound have been prepared by high-energy ball milling in the presence of hydrogen gas, a process known as reactive milling. The Curie temperature of the samples was tuned within the temperature range of 199 K to 346 K by changing the hydrogen content from 0 to 2.3 at. % with…
The corrosion performance of a mild steel (MS) exposed to a 0.5 M HCl solution with various concentrations of Rhodanine (Rh) was studied by means of anodic and cathodic voltammetric curves, electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques. Rh makes the corrosion of MS in…
Abstract High-resolution synchrotron X-ray diffraction recorded on a collection of palygorskites with different chemical compositions (obtained by analytical electron microscopy) permits unambiguous correlation of the crystallographic parameters a (or a sin β if a monoclinic phase is considered) with the nature of the…
Pyridoxal kinase catalyzes the transfer of a phosphate group from ATP to the 5' alcohol of pyridoxine, pyridoxamine, and pyridoxal. In this work, kinetic studies were conducted to examine monovalent cation dependence of human pyridoxal kinase kinetic parameters. The results show that hPLK affinity for ATP and PL is in…
A new strategy for preparing porphyrins that bear up to four different meso-substituents (ABCD-porphyrins) relies on two key reactions. One key reaction entails a directed synthesis of a 1-protected 19-acylbilane by acid-catalyzed condensation at high concentration (0.5 M) of a 1-acyldipyrromethane and a 9-protected d…
We use density functional theory to examine the properties of VO x ( x = 1−4) isolated clusters supported on rutile TiO 2 (110) and CeO 2 (111) surfaces. We calculate the structure of the clusters, the charge on the atoms in the clusters, the vanadium 2p core-level energies, the energy of the reactions VO x (s) + 1 /…
This work reported a novel epoxy system that can perform a self-repairing operation against cracks at elevated temperature. For this purpose, a two-component healing agent consisting of microencapsulated epoxy and imidazole was pre-embedded into epoxy matrix. The microencapsulated epoxy was self-synthesized in advance…
Abstract One of the most oft-confronted challenges in materials science, when using scanning electron microscopy, is the limitation of the size of the sample being examined, as well as the analysis application planned. Normally, only small samples in the order of ten to a hundred millimetres in diameter may be investi…
Very few studies have focused on the optimisation of the nanocrystalline pulsed plasma electrolytic carbonitriding process parameters. A design of experiment technique, the Taguchi method, has been used to optimise the nanocrystalline pulsed plasma electrolytic carbonitriding. The experimental design consisted of four…
Systematic study on magnetic and electrical transport properties has been performed on the Cr-doped Pr0.5Ca0.5Mn1−xCrxO3 (x=0, 0.03, 0.05, 0.07, 0.10) system. The results show that Cr-doping leads to melting of the charge ordering and induces phase separation. For the sample x=0.10, reentrant spin glass behavior is ob…
On the basis of literature review the methods of purification of the products of polyurethane (PUR) waste glycolysis, with the aim to reuse them in PUR syntheses, were presented. These methods are: extraction, distillation, and removing of amine groups, detrimental in the further process of PUR preparation, by use of…
A method has been introduced to realize multi-states storage in phase change memory (PCM) by using stacked phase change films with different amorphous resistivity. The amorphous resistivity of each phase change layer was selected to make the stacked films crystallize successively with the increase of current, and so o…
Natural and synthetic layered iron hydroxysulfides: tochilinite and valleriite, have been investigated by Mössbauer spectroscopy. Tochilinite, magnetite, troilite, and pyrite phases were found in the products of tochilinite synthesis under different conditions. The relative contents of the phases found are determined…