Materials Literature
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Using the full potential augmented plane wave plus local orbitals method within the density-functional theory, we report systematical density-functional calculations of four binary transition-metal compounds ScX (X = C, Si, Ge, and Sn) in the hypothetical cubic zinc blende (ZB) structure. Half-metallic (HM) ferromagne…
We probe spin transport in ${\text{Cu}}_{2}\text{O}$ by measuring spin-valve effect in ${\text{La}}_{0.7}{\text{Sr}}_{0.3}{\text{MnO}}_{3}/{\text{Cu}}_{2}\text{O}/\text{Co}$ and ${\text{La}}_{0.7}{\text{Sr}}_{0.3}{\text{MnO}}_{3}/{\text{Cu}}_{2}\text{O}/{\text{La}}_{0.7}{\text{Sr}}_{0.3}{\text{MnO}}_{3}$ epitaxial het…
Nanostructure manganese oxide shows very good catalytic activity in waste water treatment of dyeing industry. A few nano manganese oxides are prepared through different methods, Their catalytic degradation property of dyeing material (crystal violet solution) is tested with H2O2 as oxidizer. Besides, the influence of…
Formation and assembly of monodispersed calcite (CaCO 3 ) dots of diameters 6−10 nm using a zwitterionic phospholipid 1,2-dipalmitoyl- sn -glycero-3-phosphocholine (DPPC) monolayer as template at a two-dimensional interface is reported here. We utilized penetration of Ca 2+ at lower surface pressure (π) into the DPPC…
The long-time correlation functions of an infinitesimally thin needle moving through stationary point scatterers-a so-called Lorentz model-exhibits surprisingly long-time tails. These long-time tails are now seen to persist in a two-dimensional model even when the needle has a finite thickness. If the needles are too…
We discover that hexagonal holmium copper titanate (Ho2CuTiO6), has a unique and highly desirable combination of high dielectric constant, low losses, very small temperature coefficient, and low frequency dependence. Our first-principles calculations indicate that these exceptional properties result from a size-differ…
Controllable and selective nitration of meso-tetraphenylporphyrin using nitronium tetrafluoroborate affords a chromatography-free access to mono-, bis-and tris(4-nitrophenyl)porphyrins in high yields.
Magnetic properties, the magnetocaloric effect (MCE) and refrigerant capacity (RC) were investigated in Eu8Sr8−xGa16Ge30 (x=0,4) type-I clathrates. The substitution of Sr for Eu decreases the Curie temperature (TC) and saturation magnetization (MS) from 35 K and 65 emu/g for the x=0 composition to 15 K and 35 emu/g fo…
pingwei@sjtu.edu.cn ABSTRACT: A novel solid flame retardant poly(3-aminopropyl methylsiloxane bis(3-hydroxyphenyl spirocyclic pentaerythritol bisphosphate)) (PSBPBP) consisted of phosphorus, silicon, and nitrogen was synthesized and characterized by NMR and FTIR. Then PSBPBP was added to a polycarbonate matrix. The fl…
The structural, electronic and optical properties of carbon nitride (CN) nanotubes (CNNTs) built from triazine units were investigated by using density-functional theory (DFT) within the generalized gradient approximation. The total energies per CN unit (relative values) of armchair CNNTs are smaller than those of zig…
The structural, electronic, and mechanical properties of 4d transition-metal mononitride, PdN, are investigated using the norm-conserving pseudopotentials within the local density approximation in the framework of the density-functional theory. We have considered four different crystal structures of PdN: (i) zinc-blen…
In this letter, we proposed a metal-oxide-high-k-oxide-silicon-type (MOHOS) memory structure incorporating a high-k Yb2TiO5 charge trapping layer and the subsequent postdeposition annealing treatment. The effect of postdeposition annealing on the structural properties of Yb2TiO5 charge trapping layers was explored by…
We have experimentally realized at microwaves a dual-band ultraslow regime by constructing a metamaterial based upon the alternative stack of conventional- and complementary-split-ring-resonators-surfaces. The group delay reaches values larger than two orders of magnitude than those obtained when the electromagnetic w…
Triblock copolymer poly(styrene-b-butadiene-b-styrene) (SBS) films with long-range ordered self-assembled nanopatterns are used as templates to selectively adsorb soft-landing silver clusters. Closely spaced cluster arrays with high monodispersity are formed through the confinement of the block copolymer scaffolds, an…
Bamboo-structured carbon nanotubes (BCNTs) were synthesized with MgO-supported Pd and Cu catalysts, doped with either Mo or W, by the catalytic chemical vapor decomposition of methane. No nanotubes were observed to grow from the catalysts in the absence of the dopant metals. Additionally, the level of dopant in the ca…
A Kerr microscope that uses ultraviolet (UV) light for high-resolution domain observation was built, and the domain structure and magnetization process of hydrogenation disproportionation desorption recombination (HDDR) powder were examined. The UV Kerr microscope could observe nanometer-sized domain patterns. Applyin…
Sintered [Nd0.45(Y3Dy1)0.25∗0.55]2.8Fe14B magnets were prepared for the first time. Magnetic properties and microstructures of the magnets were investigated by magnetic measurements and electron microprobe analysis. The microstructure consists of a MRE2Fe14B (2-14-1) phase matrix having a grain size of ∼10 μm and a RE…
The essay is dedicated to the relation of symmetry and asymmetry-chirality in Nature. The Introduction defines symmetry and its impact on basic definitions in science and human activities. The following section Chirality of molecules reveals breifly development of notion of chirality and its significance in living org…
A nonlinear thermodynamic theory is applied to strained ferroelectric superlattices and used to determine the dependence of superlattice permittivity on composition. To that end, spontaneous polarizations and field-induced polarization changes in the ferroelectric layers $A$ and $B$ with thicknesses ${t}_{A}$ and ${t}…
Isotropic Nd–Fe–B nanocrystalline fine powders with particle size in the range of 1–10 μm have been developed using melt spinning and jet milling. The processing steps primarily consist of melt spinning Nd–Fe–B alloy to obtain ribbons with 25–50 μm thickness, crushing the ribbon to obtain coarse powder with average pa…