Materials Literature
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We have studied the index of refraction of periodic layered semiconductor–ferrite composite. Both the transmission matrix analysis and full-wave simulations confirm the existence of a negative index of refraction in the composite. We find that the magnitude of the negative index of refraction and its frequency range d…
Ultra-water-repellent (UWR) films were prepared by microwave plasma-enhanced chemical vapour deposition using trimethylmethoxysilane and aluminium (III) diisopropoxide ethylacetoacetate (ADE) as raw materials. The film was mainly composed of silica and alumina and was apparently transparent. The film thickness was app…
The structural and chemical stabilities of single-crystal boron carbide (B4C) under severe mechanical scratching in air and water were investigated by transmission electron microscopy (TEM). Amorphous and nanocrystalline B4C as well as nanostructured boron nitride (BN) were observed in the scratched fragments. Energy-…
Three-phase magnetoelectric (ME) laminate composites made of high-permeability (μ) MnZnFe2O4, magnetostrictive Tb1−xDyxFe2−y, and piezoelectric Pb(Zr,Ti)O3 layers and operated in longitudinal magnetization and transverse polarization (L-T) bending modes have been studied. High-μ MnZnFe2O4 layers act as flux concentrat…
It is well accepted that the reirradiation behaviour of reactor pressure vessel (RPV) steel after annealing can be different from the original irradiation behaviour. We present the first small-angle neutron scattering (SANS) study of neutron irradiated, annealed and reirradiated VVER440-type RPV weld material. The SAN…
We report on the organization of nanoparticles on a flat surface when there is strong yet tunable interaction between the particles and the surface. Specifically, we tailor the number density of citrate-stabilized gold nanoparticles on flat substrates by varying the concentration of the grafted amino groups on the sur…
The potentially bis-terdentate diamide ligand N,N'-bis[2-(2-pyridyl)ethyl]pyrazine-2,3-dicarboxamide (H(2)L(Et)) was structurally characterised. Potentiometric titrations revealed rather low pK(a) values for the deprotonation of the first amide group of H(2)L(Et) (14.2) and N,N'-bis(2-pyridylmethyl)pyrazine-2,3-dicarb…
We report here a comparative study of the theoretically calculated electronic structures of cubic BaSnO3 and cubic Ba(M0.5Sn0.5)O3 with M=Ti, V, Cr, Zr, Ce, and Pb, the tetravalent metal ions, to explore their possible efficacy for the visible light photocatalysis and solar energy conversion. We performed the calculat…
A giant magnetocaloric effect was found in La0.7Ca0.3MnO3 manganite at low magnetic fields. The magnetic entropy changes caused by a magnetic field change of 0.5 and 1.0 T were as large as 5.04 and 6.25 J kg−1 K−1, respectively, which exceed those of perovskite-like magnetic refrigerants or elemental Gd by a factor of…
The optical switching of coupled plasmons of silver nanoparticles derivatised with a photoisomerisable azobenzene ligand is presented. It is shown that nanoparticle clusters, linked with an azobenzene dithiol molecule, display switchable optical properties. The photoisomerisation of the linker molecule was used to var…
Polycrystalline samples of the delafossite Rh oxide ${\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Ag}}_{x}{\mathrm{Rh}}_{1\ensuremath{-}y}{\mathrm{Mg}}_{y}{\mathrm{O}}_{2}$ were investigated to clarify its transport properties. Mg substitution dramatically decreases the resistivity and the Hall coefficient, whereas it doe…
We have reported a general method for biocompatible modification and multi-functionalization of semiconductor quantum dots (QDs) through direct reaction of organic silanes on the surface of semiconductor QDs. Functionalized QDs, including CdSe/ZnS, CdSe/CdS core/shell and PbS QDs, have been prepared at high concentrat…
Near-field enhancement and subwavelength imaging properties of a device comprising a coupled pair of two-dimensional arrays of resonant nanospheres are studied. The concept of using two coupled material sheets possessing surface mode resonances for evanescent field enhancement is already well established in the microw…
Isothermal crystallization of doped SbxTe fast-growth phase-change films, with and without capping layers, was investigated using transmission electron microscopy, which provided direct and quantitative information on nucleation and growth processes separately. Two types of amorphous dielectric layers, ZnS–SiO2 and Ge…
Single-crystalline MnOOH (γ-MnOOH) and MnO2 nanorods (β-MnO2 and α-MnO2) were synthesized by redox reaction of a mixture of KMnO4 and Mn(CH3COO)2 at various pH levels at a temperature range of 120–180 °C. The products were characterized by powder x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Raman a…
Thin films of vanadium dioxide with grain sizes smaller than 60 nm have a metallic phase with excellent plasmonic response, but their dc resistivity falls as temperature rises to values well above the metal–insulator transition. At the transition optical switching is complete, but the switch in dc resistance is incomp…
Entropy changes accompanying a first-order magnetic transition have been studied for the intermetallic alloys LaFe13−xSix. An expression of the entropy change due to lattice expansion/contraction is derived based on the general thermodynamics theory. Combining it with the structural/magnetic measurements, and the mean…
Quantum dot (QD)–polymer composites were fabricated based on a solution of QDs dispersed in an ionic liquid. Positively charged water-soluble nanocrystals were obtained from solutions of CdSe/ZnS QDs dispersed in toluene by ligand exchange with 2-dimethylaminoethanethiol (DAET). The resulting QDs were further transfer…
In this work, we have developed a complete solution for the thermal transport in single-wire based 3ω experiment and have studied the effect of radiation on the experiment. Microscale Pt wires are used as the reference sample to measure its specific heat and thermal conductivity. Sound agreement between the measuremen…
We report in this paper the development of a novel laser-transfer scheme to integrate laterally arrays of light-emitting pixels made of semiconductor nanocrystal quantum dots (NQDs). The nanocrystal composition and size can be tailored such that the luminescence emission of the quantum dots in each device pixel consti…