Materials Literature
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We combine first-principles, statistical, and phenomenological methods to investigate the electronic and dielectric properties of NiO and clarify the nature of the gigantic dielectric response in codoped NiO. Unlike previous models which are dependent on grain-boundary effects, our model based on small polaron hopping…
Passive oxidation of single crystal silicon carbide (6H–SiC) resulted in the formation of a vitreous silica layer which crystallized gradually at temperatures near 1300°–1400°C. During this process, statistically distributed devitrification centers appeared and disk‐like aligned crystal plates (radialites) formed. The…
A novel, simple, and feasible route for synthesizing air‐stable, water‐soluble tantalum precursors has been developed using moisture‐insensitive Ta 2 O 5 as a starting source of the Ta element, based on the conventional basic flux method. Various analytical techniques have been used to characterize the formation mecha…
A hybrid polymer-nanocrystal (NC) light-emitting diode (LED) device with a single active layer structure is simply fabricated by a spin coating. From a high-resolution transmission electron microscopy (HRTEM) study, each PVK polymer particle is observed to be capped with TPBi molecules and CdSe/ZnS NCs are mainly dist…
We report that an achiral particle with anisotropic rigidity can migrate in the vorticity direction in shear flow. A minimal "tetrumbbell" model of such a particle is constructed from four beads and six springs to make a tetrahedral structure. A combination of two different spring constants corresponding to "hard" and…
The temperature-dependent oxidation of Pt nanoclusters on a thin film of Al 2 O 3 on NiAl(100), in the absence of a gaseous oxidizing agent, was investigated with various surface probe techniques. The Pt clusters (of mean diameter 2.2 nm and height 0.4 nm) grown from vapor deposition on the thin film of Al 2 O 3 on Ni…
Abstract The carbon nanotubes/ultrahigh molecular weight polyethlene (CNTs/UHMWPE) conductive composite with a low percolation threshold had been successfully fabricated, and CNTs were only dispersed in the interface of matrix particles. Some factors, including CNTs concentration, processing temperature, and the time…
Dissipative particle dynamics (DPD) is an effective mesoscopic particle model with a lower computational cost than molecular dynamics because of the soft potentials that it employs. However, the soft potential is not strong enough to prevent the DPD particles that are used to represent the fluid from penetrating solid…
Crystal structures of metastable tetragonal Ce x Zr 1− x O 2 have been studied through first principles calculations (0 ≤ x ≤ 1). Unit-cell parameters a, c, and atomic coordinates of 24 atoms were optimized for all the occupational configurations of Ce and Zr atoms by using the constraints for cell parameters: a = b a…
Abstract Finding a suitable plasticizer for polylactide (PLA) is necessary to overcome its brittleness and enlarge its range of applications. In this study, commercial PLA was melt‐blended with a new plasticizer, an ethylene glycol/propylene glycol random copolymer [poly(ethylene glycol‐ co ‐propylene glycol) (PEPG)]…
Abstract Erdnussförmig : Eine einfache Synthese großer Silbercluster nutzt Anionen als Template. Die Zahl an Silberatomen im Cluster lässt sich über die Größe des Templats und die Eigenschaften der Alkinylliganden einstellen. Für den größten Cluster mit 35 Silber(I)‐Zentren wurden Chromat‐Ionen als Templat eingesetzt…
MnO‐doped 0.82Bi 0.5 Na 0.5 TiO 3 –0.18Bi 0.5 K 0.5 TiO 3 (NBT–KBT) thick films with thickness about 40 μm have been prepared using screen printing on Pt electroded alumina substrates. The strong pyroelectric coefficient of 3.8 × 10 −4 C·(m 2 ·°C) –1 was observed in 1.0 mol% MnO‐doped‐thick films, and the calculated d…
Abstract A silicone resin with silphenylene units in Si‐O‐Si backbones was synthesized by hydrolysis‐polycondensation of 1,4‐bis(hydroxydimethylsilyl)benzene (BHB) with chlorosilanes. The structure and property of this novel silicone resin were characterized by gel permeation chromatography (GPC), Fourier transform in…
A diblock copolymer system constituting both achiral and chiral blocks, polystyrene-block-poly(L-lactide) (PS-PLLA), was designed for the examination of chiral effects on the self-assembly of block copolymers (BCPs). A unique phase with three-dimensional hexagonally packed PLLA helices in PS matrix, a helical phase (H…
The intrinsically core/shell structured La(0.6)Sr(0.4)MnO(3) nanoparticles with amorphous shells and ferromagnetic cores have been prepared. The magnetic, dielectric and microwave absorption properties are investigated in the frequency range from 1 to 12 GHz. An optimal reflection loss of -41.1 dB is reached at 8.2 GH…
An efficient full-vectorial finite element beam propagation method is presented that uses higher order vector elements to calculate the wide angle propagation of an optical field through inhomogeneous, anisotropic optical materials such as liquid crystals. The full dielectric permittivity tensor is considered in solvi…
2 W bismuth doped fiber lasers in the wavelength range 1300 – 1500 nm and variation of Bi-doped fiber parameters with core composition, Firstov, S V, Bufetov, I A, Khopin, V F, Shubin, A V, Smirnov, A M, Iskhakova, L D, Vechkanov, N N, Guryanov, A N, Dianov, E M
The boundary-value problem for a Dyakonov-Tamm wave guided by a twist defect in a structurally chiral material and propagating along the bisector of the twist defect was formulated. The resulting dispersion equation was numerically solved. Detailed analysis showed that either two or three different Dyakonov-Tamm waves…
Abstract Exfoliation of polymer layered silicate nanocomposites based upon epoxy resin has previously been reported to be enhanced by allowing some homopolymerization of the resin to occur, catalyzed by the onium ion of the organically modified clay, before the addition of the cross‐linking agent and the curing of the…
Abstract BACKGROUND: To obtain a biodegradable thermoplastic elastomer, a series of poly(ester‐ether)s based on poly(butylene succinate) (PBS) and poly(propylene glycol) (PPG), with various mass fractions and molecular weights of PPG, were synthesized through melt polycondensation. RESULTS: The copolyesters were chara…