Materials Literature
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Vertical GaN-based trench metal oxide semiconductor field-effect transistors on a free-standing GaN substrate with blocking voltage of 1.6 kV, Oka, Tohru, Ueno, Yukihisa, Ina, Tsutomu, Hasegawa, Kazuya
The electronic structures, formation energies, and band edge positions of anatase TiO2 doped with transition metals have been analyzed by ab initio band calculations based on the density functional theory with the planewave ultrasoft pseudopotential method. The model structures of transition metal-doped TiO2 were cons…
We study deterministic magnetic reversal of a perpendicularly magnetized Co layer in a Co/MgO/Ta nanosquare driven by spin Hall torque from an in-plane current flowing in an underlying Pt layer. The rate-limiting step of the switching process is domain wall (DW) depinning by spin Hall torque via a thermally assisted m…
We review pro and contra of the hypothesis that generic polymer properties of topological constraints are behind many aspects of chromatin folding in eukaryotic cells. For that purpose, we review, first, recent theoretical and computational findings in polymer physics related to concentrated, topologically simple (unk…
This Review covers photonic crystals (PhCs) and their use for sensing mainly chemical and biochemical parameters, with a particular focus on the materials applied. Specific sections are devoted to a) a lead-in into natural and synthetic photonic nanoarchitectures, b) the various kinds of structures of PhCs, c) reflect…
Abstract Benzidin und seine Derivate können im menschlichen Körper zu krebserregenden Aminen umgewandelt werden. Aus diesem Grund wird den potentiellen Risiken (z. B. Blasenkrebs) bei Kontakt mit kommerziell erhältlichen Benzidin‐haltigen und analogen Farbstoffen wachsende Aufmerksamkeit geschenkt. 1 , 2 Einige Phenol…
Abstract The photoluminescence (PL) properties of rare earth (RE)-doped SnO–ZnO–P2O5 (RE-SZP) glass were examined in the visible region. RE-SZP glass, except for those doped with Ce3+, exhibited similar optical band edges because of the s–p transition in Sn2+. The RE3+ PL excitation bands in RE-SZP glass were red-shif…
The plant species Protium heptaphyllum, widely found in the Amazon and northeast regions of Brazil, produces an oily resin commonly known as White Pitch (Breu Branco) (WP). The WP has been shown to have the characteristics to produce a sort of ‘green’ polymer. The aim of this study was to characterize commercially ava…
Thiodiglycol (TDG), also known as bis(2-hydroxyethyl) sulfide and thiodiethanol, is a precursor of the blister agent sulfur mustard (bis(2-chloroethyl) sulfide). It is also a hydrolytic degradation product, and as such, it is of considerable forensic interest to the chemical defense community. Experimental vapor press…
Degenerately Sn‐doped In 2 O 3 (ITO) nanowires were synthesized via an Au‐catalyzed vapor–liquid–solid (VLS) method at 750 °C. The Au seed layer provided sites with a high surface energy for the selected‐area growth of ITO nanowires. Morphology and crystal structures confirmed by field emission scanning electron micro…
We demonstrate the use of anomalous x-ray scattering of constituent cations at their absorption edge, in a conventional Bragg-Brentano diffractometer, to measure absolutely and quantitatively the polar orientation and polarity fraction of unipolar and mixed polar wurtzitic crystals. In one set of experiments, the grad…
SUMMARY We introduce a material model for the simulation of polycrystalline materials undergoing solid‐to‐solid phase‐transformations. As a basis, we present a scalar‐valued phase‐transformation model where a Helmholtz free energy function depending on volumetric and deviatoric strain measures is assigned to each phas…
Novel silicone elastomer was obtained by cross-linking reaction of thermal hydrosilylation reaction between poly(oxysilphenylenesiloxydisiloxane) having vinyl groups in side chain and SiH-terminated hyperbranched polycarbosiloxane. In situ measurements using solid-state 1 H NMR were performed during the cross-linking…
The microwave absorption properties of sandwich structural absorbers based on the nanocrystalline strontium ferrite (SrFe12O19), NiZn ferrite (Ni0.5Zn0.5Fe2O4) and alpha-iron (alpha-Fe) hollow microfibers with diameters of 1-3 microm have been investigated in the frequency range of 2-18 GHz. The sandwich absorbers com…
We present a theoretical approach for the simulation of the optical response and light propagation in aggregates and in ordered arrays of small noble-metal clusters with discrete electronic structure. We construct the Hamiltonian for the aggregate system based on the time-dependent density functional theory electronic…
Using fast lattice Monte Carlo (FLMC) simulations [Q. Wang, Soft Matter 5, 4564 (2009)] and the corresponding lattice self-consistent field (LSCF) calculations, we studied a model system of grafted homopolymers, in both the brush and mushroom regimes, in an explicit solvent compressed by an impenetrable surface. Direc…
This paper presents cyclic and monotonic load test results of concrete flexural members reinforced with shape memory alloy (SMA) and conventional steel bars. The ability of the SMA bars to recover and reduce permanent deformations of concrete flexural members subjected to cyclic load was investigated using reinforced…
Conducting poly(styrene-co-divinylbenzene)/single wall carbon nanotube (SWCNT) polyHIPE (polymerized high internal phase emulsion) composite foams were successfully synthesized via emulsion template polymerization. The effect of various SWCNT loadings, 0–1.4 wt.%, on the electrical conductivity and surface morphology…
ABSTRACT In this work, metamaterials are adapted for optimal design of filters with specific characteristics that are useful for sensor applications. The random hill climbing optimization method is used to find optimal structures. Periodic method of moments is applied to calculate the fitness functions of the resulted…
This paper presents a functionalized, horizontally oriented carbon nanotube network as a sensing element to enhance the sensitivity of a pressure sensor. The synthesis of horizontally oriented nanotubes from the AuFe catalyst and their deposition onto a mechanically flexible substrate via transfer printing are studied…