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 magnetic entropy change of tetragonal and orthorhombic NiMnGa fine particles made by spark erosion was investigated in this paper. It was found that the structure and crystalline phase transformation temperatures can be strongly affected by the compositions of the particles, while Curie temperature is less sensiti…
Colloidal nanocrystals are nanometer-sized, solution-grown inorganic particles stabilized by a layer of surfactants attached to their surface. The inorganic cores exhibit useful properties controlled by composition as well as size and shape, while the surfactant coating ensures that these structures are easy to fabric…
Based on density-functional theory and density-functional perturbation theory we have studied the thermodynamical and vibrational properties of $\mathrm{Mg}{({\mathrm{AlH}}_{4})}_{2}$. The crystal structure recently proposed on the basis of x-ray powder-diffraction data has been confirmed theoretically by the comparis…
The fundamental nature of the magnetic phase transitions in the Ni-Mn-Ga system is investigated quantitatively. By compositional tuning, the first-order metamagnetic/martensitic structural transition (occurring at TM≈200K in the parent compound Ni2MnGa) and the second-order/continuous transition (at TC≈375K in the par…
Manganese is a common dopant to achieve dilute magnetic semiconductors. Most magnetic semiconductors are hole-type and the Curie temperature is critically depending on the holes concentration. Boron can be used to increase the holes concentration and enhance the Curie temperature. In systems with both Mn and B dopants…
Over the past decade, we have carried out a comprehensive development program to produce high‐purity Ga:La:S and Ge:S glasses and further process these glasses into thin films. In this paper, we discuss the general properties of these glass systems and the techniques used to obtain thin films. We demonstrate the abili…
A novel strategy for the fabrication of microcapsules is elaborated by employing biomacromolecules and a dissolvable template. Calcium carbonate (CaCO(3)) microparticles were used as sacrificial templates for the two-step deposition of polyelectrolyte coatings by surface controlled precipitation (SCP) followed by the…
Allochromatium vinosum polyhydroxyalkanoate synthase catalyzes formation of poly-(R)-3-hydroxybutyrate (PHB) from (R)-3-hydroxybutyryl-coenzyme A (HB-CoA). (R)-3-Hydroxybutyryl-N-acetylcysteamine (HB-NAC) is an alternative substrate for this synthase in vitro, with a turnover 1% that of HB-CoA. With HB-NAC, the molecu…
Roddlesden–Popper homologous series Srn+1ConO3n+1 (n=1,2,3,4, and ∞) compounds were successfully synthesized by a high pressure and high temperature technique. Structure refinement revealed that these compounds crystallize in tetragonal structures, while the compound n=∞ is cubic. These compounds are ferromagnetic wit…
Single‐crystal CdSe nanorods ([001] orientation) with diameters in the range of 40–60 nm and aspect ratios of 5–8 were successfully synthesized at 180°C for 10 h through a facile surfactant‐assisted hydrothermal method, using Na 2 SeO 3 as a high‐quality soluble selenium source. The products were characterized by X‐ra…
The objective of this work is to characterize the magnetoelastic transduction properties of single-crystal and textured polycrystalline Fe-Ga alloys (Galfenol) under controlled mechanical, magnetic, and thermal conditions. Polycrystalline samples of interest include a directionally solidified specimen, which possesses…
BACKGROUND: The TyrA protein family includes members that catalyze two dehydrogenase reactions in distinct pathways leading to L-tyrosine and a third reaction that is not part of tyrosine biosynthesis. Family members share a catalytic core region of about 30 kDa, where inhibitors operate competitively by acting as sub…
We observed significant influence of the top-electrode material on the thickness and temperature dependences of the dielectric response of single-crystalline Ba0.7Sr0.3TiO3 thin-film capacitors. For SrRuO3∕Ba0.7Sr0.3TiO3∕SrRuO3 samples, the position of dielectric maximum shifts to lower temperatures with decreasing fi…
The effect of pH on the complexation of poly(acrylic acid) with poly(vinyl alcohol) in aqueous solution, the miscibility of these polymers in the solid state and the possibility for crosslinking the blends using gamma radiation has been studied. It is demonstrated that the complexation ability of poly(vinyl alcohol) w…
Mach–Zehnder interferometric electro-optic polymer modulators composed of highly nonlinear phenyltetraene bridge-type chromophores within an amorphous polycarbonate host matrix were investigated for their resistance to gamma rays and 25.6 MeV protons. No device failures were observed and the majority of irradiated mod…
Thermal expansion induced spontaneous microcracking in large‐grained polycrystalline alumina was analyzed using experimental techniques as well as numerical simulations. A microstructure‐based finite‐element model (object oriented finite‐element analysis) was used to simulate the accumulation of microcrack damage upon…
High-density, well aligned, -oriented wurtzite ZnO nanorod arrays with significantly different tip shapes were controllably fabricated by evaporating zinc powders at temperatures varying from 450 to 600 °C. It is found that the tip shape depends not only on the substrate but also on the substrate direction relative to…
The Gd5Ge2Si2 compound presents a giant magnetocaloric effect with transition temperature at around 276 K and is a very good candidate for application as an active regenerator material in room temperature magnetic refrigerators. Recently it has been shown that pressure induces a colossal magnetocaloric effect in MnAs,…
Visible light (>450 nm) is used to efficiently cleave carboxylic acids, amino acids, and phosphates from their N-methyl picolinium esters. Photolysis using pyrromethene dyes PM 546 and PM 597 and also coumarin 6 as photosensitizers effects release of carboxylic acids, N-protected amino acids, and phosphates in quantit…
The phase transition from Fe(II)(S=0)–CN–Mn(III)(S=2) to Fe(III)(S=1∕2)–CN–Mn(II)(S=5∕2) in Rb0.98Mn1.01[Fe(CN)6]∙0.2H2O was observed at room temperature with a one-shot-laser-pulse (λ=532nm; pulse width: 6ns) irradiation. The quantum yield (Φ) depended on the laser power density (P) and Φ=38 was achieved with a 24mJc…