Materials Literature
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Abstract The degree of compatibilization between natural rubber (NR) and acrylonitrile‐butadiene rubber (NBR) was investigated by two different methods. NBR was chemically modified with maleic anhydride in a screw twin mixer with and without reaction initiator, benzoyl peroxide. Also, the effects of molecular weight o…
A ceramic matrix composite (CMC) plain weave composite material (DLR-XT) has been studied for its thermal transport behaviour. Three micro Unit Cell models have been developed for three different classes of manufacturing porosities, previously identified and quantified for the material, that take into account the ther…
A stochastic approach, using the Ising model combined with the Monte Carlo simulation, is employed to study the phenomenon of tongue tear failure in coated fabrics. The complicated mechanisms involved can be realistically simulated with a relatively simple algorithm. The important factors, especially the effects of th…
BACKGROUND: Gadolinium formulations, which are administered as contrast agents in magnetic resonance imaging examinations, interfere with colorimetric serum calcium determinations. METHODS: We performed an in vitro study to determine the extent to which three gadolinium formulations-gadodiamide (Omniscan), gadopenteta…
Nanotubes in electric fields: Electrochemistry of double-walled carbon nanotubes (DWCNTs; see picture) was studied for the first time. The DWCNT was prepared by pyrolysis of fullerene peapods, C60@SWCNTs. Responses to electrochemical doping of outer and inner walls were traced and distinguished by in situ Raman spectr…
Peculiarities of the non-local responses of spatially inhomogeneous insulating media to electromagnetic waves are considered within a phenomenological approach. In the case of a weak spatial dispersion (SD), a 'quasi-local' constitutive equation is derived, which allows one to isolate the effects of SD in relation to…
The 3d-transition-metal dioxo-, peroxo-, and superoxoclusters with the general composition MO2, M(O2), and MOO (M = Mn, Fe, Co, and Ni) were studied by DFT by the B1LYP functional. The dioxides in their ground states represent the global minima for the M + O2 system. Both ground-state dioxides and the lowest-energy pe…
Inspired by the water-repellent behavior of the micro- and nano-structured plant surfaces, superhydrophobic materials, with a water contact larger than 150 degree, have received a lot of research attentions recently. It has been suggested that contamination, oxidation and current conduction can be inhibited on such su…
Effects of encapsulated fullerene rotation on peapod electronic properties are studied by using Slater–Koster tight-binding calculations. We found that the encapsulated fullerenes can rotate freely in the space of a (10, 10) tube at room temperature, and the rotation of fullerenes will affect C 60 @ (10,10) peapod ele…
Abstract Mg x Zn 1− x O (0 ≤ x ≤ 1) layers without wurzite‐rocksalt phase mixing have been successfully grown by MBE on a‐plane sapphire substrates with ZnO buffer layers. The layers of x < 0.5 take wurzite (0001) structure eliminating the problem of wurzite‐rocksalt phase mixing reported previously between x = 0.3…
The UV optical absorption edge of pure PbWO4 (PWO) and a series of La3+-doped PbWO4 crystals was measured at room temperature. Parameters, including the energy gap Eg and the energy of phonon Ep involved in the indirect transition, were calculated, and the dependence of the transition on impurities instead of phonons…
Artificial antenna systems: Zeolite L crystals loaded with a fluorescing donor dye and modified at the external surface with an acceptor dye are studied on a semiconductor surface (see picture). Radiationless excitation energy transfer from the donor dye to the acceptor dye and further through a thin insulating layer…
This paper describes the synthesis and characterization of a novel series of copolymers with different lengths of oligo(phenylene vinylene) (OPV) as the rod block, and poly(propylene oxide) as the coil block. Detailed characterization by means of transmission electron microscopy (TEM), atomic force microscopy (AFM), a…
Abstract The compounds [Hg 2 (μ—SePh) 2 (SePh) 2 (PPh 3 ) 2 ] ( I ) and [Hg 3 Br 3 (μ—SePh) 3 ] · 2 DMSO ( II ) are formed by reactions of [Hg(SePh) 2 ] with PPh 3 in THF( I ) or with HgBr 2 in DMSO ( II ) at room temperature. X—ray crystallography reveals that the cluster I consists of a distorted square built by eac…
Abstract New aryl‐terminated octaalkynyl tetrapyrazinoporphyrazines were prepared in three steps starting from functionalised bisarylalkynyl 1,2‐diones. While the tert ‐butylphenyl substituents were shown to aid solubility in organic solvents and to reduce chromophore aggregation efficiently, more hydrophilic tetrapyr…
The dynamics of ferroelectric hysteresis for Nd-substituted Bi 4 Ti 3 O 12 thin films as a function of frequency and amplitude of time-varying external electric field is measured utilizing a Sawyer–Tower (ST) circuit. The frequency ranges from 1 to 10 6 Hz and the amplitude range is 101–400 kV cm −1 . Given a fixed fi…
The formation of superabundant vacancies (SAVs; vacancy–hydrogen clusters) was studied in Nb–H alloys by means of resistivity measurements as a function of temperature, pressure and H concentration. The formation energy of a vac–H cluster (0.3 ± 0.1 eV), which is 1/10 of the formation energy of a vacancy in Nb, is exp…
The visualization of surface reactions on the atomic scale provides direct insight into the microscopic reaction steps taking place in a catalytic reaction at a (model) catalyst's surface. Employing the technique of scanning tunneling microscopy (STM), we investigated the CO oxidation reaction over the RuO2(110) and R…
In the framework of the perturbation theory an expression suitable for calculation of the effective conductivity of 3-D inhomogeneous metals in uniform magnetic field $H$ is derived. For polycrystals of metals with closed Fermi surfaces in high magnetic fields the perturbation series defining the longitudinal and the…
Eight novel three-coordinate boron compounds with the general formula BAr(2)L, in which Ar is mesityl and L is a 7-azaindolyl- or a 2,2'-dipyridylamino-functionalized aryl or thienyl ligand, have been synthesized by Suzuki coupling, Ullmann condensation methods, or simple substitution reactions (L = p-(2,2'-dipyridyla…