Materials Literature
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Abstract Novel heterogeneous cation‐exchange membranes using poly (ether sulfone)(PES) as binder and sulfonated poly(phenylene sulfide) (SPPS) powder as polyelectrolyte were prepared by the solution casting‐immersion method. Compared with a conventional route for heterogeneous membrane, the steps of milling resin into…
Abstract Acrylic polyols of different hydroxyl numbers consisting of hydroxy ethyl methacrylate, methyl methacrylate, butyl acrylate, and styrene were prepared by free‐radical solution as well as suspension polymerization techniques in the presence of benzoyl peroxide initiator. These polyols were crosslinked with but…
The atomic structure of the film–substrate interface of a (001) Sr2RuO4/(100)c LaAlO3 film, determined by high-resolution transmission electron microscopy and simulation, is reported. The structure of superconductivity-quenching Δc≈0.25 nm out-of-phase boundaries (OPBs) in the film is also reported. Growth in one regi…
A density functional plane-wave pseudopotential method is used to study the formation energy of a number of acceptor- and donor-type defects in SrTiO 3 as a function of oxidizing atmosphere and doping levels in the bulk crystal. Of the three donor defects (V O , Nb Ti and Al Sr ) and two acceptor defects (Na Sr and Al…
We report the structural investigations of β-HgS and HgSe quantum dots as a function of temperature between 300 and 600 K using x-ray diffraction. For both the chalcogenides, the zinc-blende structure remains stable up to 600 K without undergoing any phase transformation. The crystallite size increases as a function o…
Although good precision has been realised in iron loss calculation for static electrical apparatus, such as transformers, difficulties have been encountered in the case of rotating machines. Due to complex structures, varying flux distributions, rotational field and flux density harmonics, less satisfactory results ar…
The aim of this article is to determine the role of carbon atoms in the growth of hydrogenated amorphous carbon (a-C:H) films by means of an argon/acetylene expanding thermal plasma. Cavity ring down absorption spectroscopy is used to detect metastable carbon atoms by probing the 1s2 2s2 2p 3s 1P1←1s2 2s2 2p2 1S0 elec…
Recent experimental results from dynamic light scattering on two-component colloidal mixtures close to the glass transition are compared to theory. In the framework of the mode-coupling theory of the glass transition, close agreement is found in general. Discrepancies are identified for the minority-particle correlati…
Abstract Organophilic montmorillonite was prepared using ion‐exchange method between sodium ions in clay layers and stearyltrimethyl ammonium chloride in the various solvents, including deionized water, ethanol, acetone, and toluene. The montmorillonite has the largest d 001 spacing, as determined by X‐ray diffraction…
The thermoelectric properties of the quaternary AlPdReRu icosahedral quasicrystals (i-AlPdReRu) obtained by replacing Re with Ru in AlPdRe icosahedral quasicrystals have been studied. In the middle of the substitution of Ru for Re, the electrical conductivity increases and the peak of Seebeck coefficient shifts to a h…
The dependence of optically stimulated luminescence spectra on the energy of excitation photons has been investigated for a wide range of feldspars. In the vicinity of the 1.44 eV resonance, the spectra are in many cases best described by a Voigt profile with a minor Lorentzian component centred at 1.44 eV. Most sampl…
We investigated the temperature-dependent magnetoresistance of granular (Ga,Mn)As/MnAs hybrids grown on (100) GaAs in different transport geometries. The observed magnetoresistance effects are much bigger than for a corresponding (Ga,Mn)As reference sample without MnAs nanoclusters. We find that the magnetoresistance…
In this work we present single crystal infrared (IR) reflectance spectra for the Dy3Al5O12 and Er3Al5O12 compounds, their corresponding optical constants, as well as a discussion concerning the vibrational, dielectric, and elastic properties of various members of the rare earth aluminum garnet family. In the framework…
Two chiral dimethacrylate and one chiral diacrylate monomer containing an azobenzene group were synthesized and dissolved in a commercial ferroelectric liquid crystal (FLC) host. With two of the monomers, thermally induced radical polymerization with the mixture exposed to linearly polarized irradiation results in a b…
Novel layered silica−organic nanostructured materials were prepared by hydrolysis and condensation of alkoxytrichlorosilanes ( n -C n H 2 n +1 OSiCl 3, n = 12, 14, 16, 18, and 20) as single precursors. The formation relies on the self-assembly of alkoxysilanetriols ( n -C n H 2 n +1 OSi(OH) 3 ) generated by the prefer…
Abstract Two aromatic, pyridine‐based ether diamines were prepared by the nucleophilic aromatic substitution reaction of 4‐aminophenol and 5‐amino‐1‐naphthol with 2,6‐dichloropyridine in N ‐methyl‐2‐pyrrolidone as a solvent. Polycondensation reactions of the obtained diamines with pyromellitic dianhydride, benzophenon…
Electronic structure calculations were performed for MnN and ${\mathrm{Mn}}_{3}{\mathrm{N}}_{2}$ using a full-potential linearized muffin-tin orbital method in the local spin density approximation. Structural relaxation by energy minimization and calculations for various different magnetic configurations were performe…
Abstract The orientation of platelets in micro‐meter‐thick polymer‐clay nanocomposite films was investigated with small‐angle neutron scattering (SANS), small‐angle X‐ray scattering (SAXS), and wide‐angle X‐ray diffraction (WAXD). The films with various clay contents (15–60% by mass fraction) were prepared by a layer‐…
Abstract A generalized model for scattering from a collection of independent (isolated) stacks of layers enabled predictions of and parameterized fits to small‐angle X‐ray scattering from layered silicate dispersions. From this fundamental development, example investigations that use small‐angle scattering to examine…
The main feature of an exchange spring magnet can be characterized by ferromagnetic exchange coupling between a magnetically soft phase and a magnetically hard phase. The coupling constant J, a measure of the coupling strength between the two phases, is a key parameter in controlling the spring magnet properties. A fe…