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。
This work confirms that not only surface plasmons but many other kinds of electromagnetic eigenmodes should be considered in explaining the values of the transmittivity through a slab bearing a two-dimensional periodic corrugation. Specifically, the role of Brewster-Zennek modes appearing in metallic films exhibiting…
The crystal structure and morphology of the Nd-rich phase in postannealed sintered Nd–Fe–B hard magnets were investigated by transmission electron microscopy (TEM). The Nd-rich phase at grain boundaries thinner than about 2nm was found to be amorphous; as the boundary region broadened, it assumed a face-centered cubic…
Presented are magnetization measurements on a crystal of Fe8 single-molecule magnets using a Hall probe magnetometer. Irradiation with microwaves at frequencies of 92 and 110-120 GHz leads to the observation of electron paramagnetic resonance (EPR) detected via magnetization measurements. A quantitative analysis of th…
The pi-stacking between aromatic oligomers has been extensively studied for many years, although the notion of exploiting this phenomenon as the driving force for molecular actuation has only recently emerged. In this work we examine with MP2 and Car-Parrinello ab initio calculations the actuation properties of a nove…
This letter reports on the superior magnetocaloric properties of La0.7Ca0.3−xSrxMnO3 (x=0.05, 0.10, 0.20, and 0.25) single crystals. Upon 50 kOe applied field, the magnetic entropy changes (ΔSM) reach values of ∼10.5, 7.45, 6.97, and 6.86J∕kgK for x=0.05, 0.10, 0.20, and 0.25 compositions, respectively. The large magn…
To overcome some deficiencies in previous constitutive models of giant magnetostrictive materials, a nonlinear and coupled model is suggested to describe the constitutive relations for a Terfenol-D rod subjected to an axial pre-stress and then located in an axial magnetic field. The numerical simulation by the model p…
ESR spectra are studied in a series of diamagnetically diluted manganites, single crystals of LaGa 1− x Mn x O 3 , in a broad range of the Mn ion concentration, . With increase in Mn concentration, a complex multi-line spectrum, typical for low Mn concentrations, evolves to an exchange-narrowed several- or single-line…
Ionic diffusion in the quartz–β-eucryptite system is studied by DC transport \nmeasurements, SIMS and atomistic simulations. Transport data show a large \ntransient increase in ionic current at the α–β phase transition of quartz (the \nHedvall effect). The SIMS data indicate two diffusion processes, one in…
The structural stability of half-metallic zinc-blende pnictides and the robustness of their half-metallic ferromagnetism in the presence of tetragonal and orthorhombic crystalline deformations are studied using a full-potential linear augmented plane wave method within the density-functional theory. The total energies…
Aqueous solutions containing pyrrole and calix-6-arenehexasulfonic acid were found to undergo polymerization in the absence of either a chemical oxidant or electrochemical oxidation. The product was an unstable colloidal suspension consisting of spherical polypyrrole particles measuring ≥500 nm in diameter. Conductivi…
In this work a systematic comparison of DC electrical conductivity and IR optical properties of thin films of , where and R = Sm or Eu, is performed. Independently of the nature of R, it is confirmed that the metal–insulator transition temperature ( T MI ) in as well as in RNiO 3 is driven by the mean lattice distorti…
Site-specific spectroscopy is critical for a molecular-level understanding of the mechanisms and dynamics of the inhomogeneous chemical processes crucial for catalysis, surface and interfacial chemistry, and membrane protein dynamics in living cells. Surface-enhanced Raman scattering (SERS) spectroscopy and microscopy…
The rigid-rod polymer poly(1,5-naphthalenebenzobisthiazole) (Naph-1,5-PBT) was synthesized and spun into fibers from the lyotropic mesophase of the polymer in polyphosphoric acid by a dry-jet wet spinning method. The crystal structure of naph-1,5-PBT fibers was investigated using X-ray diffraction and molecular modeli…
The luminescent properties of Gd 2 SiO 5 powder crystals doped with Eu 3+ were investigated using synchrotron radiation and a VUV laser (157.6 nm) as excitation sources. The excitation spectra in the range of 160–330 nm monitoring the red emission from Eu 3+ ions reveal bands corresponding to intraconfigurational 4f–4…
A novel electrochemical process, based on simultaneous underpotential deposition of Pb and S from the same solution containing EDTA, Pb2+, and S2- at a constant potential, is reported. AFM and XRD results indicate that highly crystalline thin films of PbS could be synthesized by this method.
Lipophilic hexaporphyrin free-base and copper-metalated assemblies supported on a Sn6O6 core have been synthesized and characterized. The nuclease activity of the copper derivative has been studied.
Asymmetric telechelic α-hydroxyl-ω-(carboxylic acid) poly(ε-caprolactone) (HA-PCL) and α-hydroxyl-ω-(carboxylic acid) poly(δ-valerolactone) (HA-PVL) were synthesized by ring-opening polymerization of ε-caprolactone (CL) and δ-valerolactone (VL), respectively. HA-PCL oligomers were obtained at 150 °C in 2 h using ammon…
Electrically addressable biomolecular functionalization of diamond thin films is achieved by growing a conductive diamond thin film on molybdenum electrodes, functionalizing to produce surface nitro groups, and electrochemically reducing the nitro groups on specific diamond-coated electrodes to primary amines. The ami…
Polar optical-phonon modes are derived analytically for spheroidal quantum dots with wurtzite crystal structure. The developed theory is applied to freestanding spheroidal ZnO quantum dots and to spheroidal ZnO quantum dots embedded into a MgZnO crystal. The wurtzite (anisotropic) quantum dots are shown to have strong…
We propose a new method for carrying out field-theoretic simulations of polymer systems under conditions of prescribed external stress, allowing for shape changes in the simulation box. A compact expression for the deviatoric stress tensor is derived in terms of the chain propagator, and it is used to monitor changes…