Materials Literature
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Asymmetric triphenylene imidazolium salts with different spacer lengths were successfully synthesized through quarternization of ω‐bromo‐substituted triphenylenes with 1‐methyl imidazole. The asymmetry in ω‐bromo‐substituted triphenylenes tended to destroy liquid crystallinity in the sample. However, highly ordered co…
Liposomes, or phospholipid vesicles, have been recognized as a potential drug delivery vehicle for three decades ([1][1]). Depending on the drug of interest, liposomes can serve as a controlled release carrier or simply as a biocompatible solubilizing vehicle for poorly soluble agents. Because of
A constitutive model that includes the effects of elasticity, crystal reorientation (twinning or detwinning), phase transformations, and plasticity is presented. The model is applied to a uranium-6wt% niobium (U-6Nb) alloy, which is known to exhibit the shape memory effect. The inelastic strains for phase transformati…
In the present review, the authors do not try to provide a comprehensive review of researches on polymer/clay nanocomposites (PCNs), but some examples to demonstrate different exfoliation processes of the clay in various polymer matrixes and the dispersed state of clay. Interaction between polymers and layered silicat…
Energy analysis of the types of orientation of smectic C * liquid crystals is performed. Criteria for the type and quality of their orientation in electrooptic elements with surfaces of orientants of different nature are revealed. An energy parameter of the optical quality of planar orientation of a smectic C * liquid…
We report the effect of processing parameters such as (1) uniaxial and (2) isostatic pressings on ferroelectric behavior of lead zirconate titanate (PZT) having Zr∕Ti ratio 65∕35. The effect of temperature (−125–250°C) on pinched loop characteristics of uniaxially pressed PZT is also reported. Polycrystalline ceramic…
The electronic and optical properties of zincblende Zn X ( X =S, Se, Te) and Zn X :Co are studied from density functional theory (DFT) based first principles calculations. The local crystal structure changes around the Co atoms in the lattice are studied after Co atoms are doped. It is shown that the Co-doped material…
It is confirmed that value of the spontaneous polarization in triglycine sulfate is reduced by a DC electric field perpendicular to its ferroelectric b axis. The reduction is influenced by temperature and by application time, intensity and direction of the perpendicular electric field. The reduced value is maintained…
This paper describes a procedure to prepare metal-oxide interfaces for transmission electron microscopy by the focused ion beam technique. The advantage of this procedure is to allow the observation of metal-oxide interfaces of irradiated samples with a homogeneous thickness without the need to have an instrument insi…
The spectral and kinetic properties of excited states of luminescent defects (oxygen-deficient centers) in SiO 2 ceramics are studied using pulsed cathodoluminescence and time-resolved photoluminescence. It is found that, in nanostructured samples prepared by thermal decomposition of polysilazane in air, there can exi…
We describe a high-pressure cell for magnetic measurements in a magnetic property measurement system superconducting quantum interference device (SQUID) magnetometer. The cell has been developed for studies of weakly magnetic materials and has the operating pressure limit of 1GPa. Its design is focused on reducing the…
Purpose The paper seeks to find out new eco‐environmentally friendly surface treatments based on vanadate compounds as alternatives to the process involving toxic chromates for the corrosion protection of aluminium alloys. Design/methodology/approach A treatment process in which the surface was etched prior to vanadia…
The crystal-chemical principle of designing multicomponent compounds of the desired structure was applied to the development of solid matrices for immobilization of radioactive waste components. The approach to designing mineral-like crystalline materials was based on the structural features and isomorphism concept. T…
The aerobic oxidative cleavage of styrene C=C double bonds catalyzed by simple manganese porphyrin is reported. Under the catalysis of chloro(tetraphenylporphinato)manganese, the oxidative cleavage of the carbon-carbon double bond of the styrene with air yields benzaldehyde. Our results show that the oxidative cleavag…
Magnetic properties of cementite after strong plastic deformations and subsequent annealing in a broad range of temperatures are studied. The plastically deformed cementite is shown to exist in a soft (H c ≈ 80 A/cm) state; the annealed cementite, in a hard (H c ≈ 240 A/cm) state. The nature of the cementite’s soft an…
Self-expandable nitinol (nickel-titanium) alloys and 316L stainless steel are the most commonly used materials in the production of coronary stents. However, tantalum (Ta) has already been used to make stents for endovascular surgery and may constitute an alternative to other materials because of its better electroche…
Recent experimental and theoretical work on the CO oxidation reaction at “ruthenium” catalysts provides intriguing insight into the microscopic origins behind the frequently discussed pressure and materials gap between studies performed in ultra-high vacuum (UHV) and under realistic pressure conditions. Focusing on th…
If field-effect devices based on wide-band-gap semiconductors are ever to find wide application in real transparent electronics, their performance is required remain stable under visible light. In particular, a thin-film transistor (TFT) irresponsive to visible illumination has a practical advantage, if used for the s…
The kinetics of mechanochemical synthesis of aluminum carbide Al 4 C 3 from elements was studied with X-ray diffraction analysis, low-temperature argon adsorption, laser granulometry, chemical analysis, X-ray photoelectron spectroscopy, and electron scanning microscopy. The conversion was presented as a function of en…
Transformer inrush currents are high-magnitude, harmonic rich currents generated when transformer cores are driven into saturation during energization. These currents have undesirable effects, including potential damage or loss-of-life of transformer, protective relay miss operation, and reduced power quality on the s…