Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The room temperature stretching process of annealed polypropylene hard elastomer films was analyzed and the relationship between the low-temperature endotherm plateau in the differential scanning calorimetry curves generated during annealing and the stretching-induced pore formation was studied. It was found that comp…
To understand the interactions between defects and grain boundaries (GBs) in oxides, two atomistic modeling methods were used to examine the role of GBs in a model system, rutile TiO2, in modifying radiation-induced defect production and annealing. Molecular dynamics was used to investigate defect production near a sy…
A remarkable enhancement of light extraction efficiency in GaN-based blue light-emitting diodes (LEDs) with rough beveled ZnO nanocone arrays grown on the planar indium tin oxide (ITO) layer is reported. The light output power of LEDs with rough beveled ZnO nanocone arrays was increased by about 110% at 20 mA compared…
Within the huge family of Heusler compounds only a few quaternary derivatives are known that crystallize in the F43m space group. In this work, the yet unreported compounds CoRhMnZ (Z = Ga, Sn, Sb) and the alloy Co(0.5)Rh(1.5)MnSb were investigated in detail by experimental techniques and theoretical methods. The ab i…
The origin of exciton-phonon interaction in polar semiconductors is investigated. The relative contributions of Fr\"ohlich coupling and deformation potential scattering are identified by analyzing experimentally measured phonon-assisted luminescence using a rigorous many-body approach. Our experiment-theory comparison…
Based on first-principles study, tuning of electronic structure of graphene is reported. The emergence of band gap in this semimetal can be accomplished through different mechanisms. In this study, we have reported on the band gap modulations in graphene through chemical functionalization with oxygen, under the applic…
Convenient new methods for the synthesis of 4'-alkyl-, 4'-alkylcyclohexyl or 4'-alkylphenyl monofluoro-, difluoro- and tetrafluoro-substituted 4-alkoxy- or 4-alkyltolanes are proposed. The temperature and enthalpy of the phase transition for the homologues of the eight series, as well as the examples of the mixtures w…
Linear and star-shaped pyrazinacenes 1a-b and 2 were synthesized via condensation between a new building block 11 and pyrene tetraones or cyclohexaone. Compound 2 represents the largest star-shaped dihydropyrazine fused pyrazinacene reported so far. These largely expanded pyrazinacenes show good solubility and have a…
There are large areas of Oxisols in South America, including Brazil, with low fertility and acidity. To improve crop yields on these Oxisols, liming and fertilization is an essential practice. However, besides the high cost of fertilizers, chemical fertilizers cannot be used in organic production systems, except insol…
The excitonic properties of Si(core)/Ge(shell) and Ge(core)/Si(shell) nanocrystals (NC’s) with diameters of ∼1.9 nm are investigated using a combination density functional ab initio method to obtain the single particle wave functions and a configuration interaction method to compute the exciton fine structure and abso…
Using ion implantation, the electrical as well as the magnetotransport properties of individual ZnO nanowires (NWs) can be tuned. The virgin NWs are configured as field-effect transistors which are in the enhancement mode. Al-implanted NWs reveal a three-dimensional metallic-like behavior, for which the magnetoresista…
Abstract Magnetic resonance imaging (MRI) is a powerful and noninvasive diagnostic technique of the human anatomy, physiology, and pathophysiology on the basis of superior spatial resolution and contrast. MRI is useful in providing anatomical and functional images of the human body. A large number of MRI techniques ar…
The crystal structure and physical properties of multiferroic polycrystalline Ca(2+)-doped BiFeO(3) samples have been investigated. The present experimental investigation suggests that Bi(1-x)Ca(x)FeO(3-x/2) (x ≤ 0.1) can be considered as a solid solution between BiFeO(3) and CaFeO(2.5). The oxidation state of Fe in t…
Oxygen plasma assisted molecular beam epitaxy was used to grow thin films of In 2 O 3 on α-Al 2 O 3 (0001) over a range of substrate temperatures between 300 and 750 °C. The crystal structures and morphologies were examined by X-ray diffraction, transmission electron microscopy, and atomic force microscopy. In all cas…
New important applications of copper metal, e.g., in the areas of hydrogen production, fuel cell operation, and spent nuclear fuel disposal, require accurate knowledge of the physical and chemical properties of stable and metastable copper compounds. Among the copper(I) compounds with oxygen and hydrogen, cuprous oxid…
Modern controlled electric drive applications, such as lifts, port rubber tyred gantry cranes, and tooling machines, are characterized by high ratio of the peak to average power. Moreover, such applications have a need for braking at rated power. In ordinary drives, the braking energy, which represents 30%–40% of the…
We have investigated the insulator-metal transition (IMT) of the 5$d$ system Sr${}_{2}$IrO${}_{4}$ by optical spectroscopy. Change of the band filling as well as tuning of the spin-orbit interaction (SOI) strength has been realized in single crystalline thin films with continuous cation substitutions. Upon the IMT, th…
N-doped titanium dioxide is one of the most promising materials for photocatalysis in the visible region. The exact location of nitrogen in the host lattice is still under debate. Here, we synthesized a series of N-doped titania nanoparticles. Average Ti nearest neighbors distances were obtained from EXAFS experiments…
The expected potential benefits promised by nanotechnology in various fields have led to a rapid increase of the presence of engineered nanomaterials in a high number of commercial goods. This is generating increasing questions about possible risks for human health and environment, due to the lack of an in-depth asses…
On behalf of the WPI Center for Materials Nanoarchitectonics (MANA), we wish to express our gratitude for the publication of this special issue of Advanced Materials, which highlights the recent research activities of MANA. In this preface, we describe briefly the history, vision, and missions of MANA and then outline…