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。
We have fabricated organic diodes utilizing several pi-conjugated organic semiconductors (OSEC) as spacer layers between La2/3Sr1/3MnO3 (LSMO) and various metallic electrodes, and measured their magnetoresistance (MR) and magnetoelectroluminescence (MEL) responses. The devices exhibit large negative high-field MR resp…
The magnetic properties of different compositions in the self-doped lanthanum manganites, ${\mathrm{La}}_{1\ensuremath{-}x}\mathrm{Mn}{\mathrm{O}}_{3}$, have been studied by ac susceptibility and dc magnetization measurements in the temperature range $10--300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. All compositions wit…
To estimate the apex field-enhancement factor associated with an array of carbon nanotubes (CNTs) on a planar cathode surface, the model of the floating spheres between parallel anode and cathode plates was proposed. An approximate formula for the enhancement factor was derived showing that the intertube distance of a…
Experimental results of magnetization and neutron diffraction in the temperature range $300--1100\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ evidence an anomalous high-temperature irreversible magnetic behavior on metastable FeCu solid solutions. When the temperature is increased above $500\phantom{\rule{0.3em}{0ex}}\mathr…
Transparent conductive In2O3–SnO2 films were deposited by dc magnetron sputtering on unheated glass substrates using high-density ceramic targets with various SnO2 concentrations (0–100 wt. %). These films were subsequently postannealed in various atmospheres [air, Ar (100%) or Ar(97%)+H2(3%)] for 1 h at 200 °C. All t…
Surface-modified colloids which can selectively interact with biological species or surfaces show promise as drug delivery systems. However, the preparation of such targeted devices remains challenging, especially when considering polyion complex micelles for which side reactions with the ionic core components (typica…
This is a critical survey of the phenomenon of strain‐induced crystalline phase changes in semi‐crystalline polymers. This paper is not concerned with the strain‐induced crystallization of glassy polymers. An examination is made of the experimental data reported in literature, together with a discussion about the mech…
A new analytical model for the secondary electron (SE) emission yield, δ, is applied to polymers. It involves a parameter k , k = z C / R , between the most probable energy dissipation depth, z C , of primary electrons (PE) and their range R , where k ranges from 0.5 and 0.45 for low-density, low atomic-weight materia…
Abstract The present paper is focused on the microstructural stability of the Framatome-ANP M5™ (Zr-1%NbO) alloy. Thin foils were cut from M5 cladding tubes irradiated from 1 to 6 annual cycles in EDF PWRs, and examined by analytical transmission electron microscopy (TEM). The results show that within the wide range o…
A question of orientation: The self-assembly of a dialkynylene-bridged zinc pyridylporphyrin dimer with rotational freedom preferentially leads to a cyclic tetramer consisting of the perpendicular conformer (⊥), rather than the more usual planar conformer ( // , see picture). This preference most likely arises from an…
With the view to developing new chiral molecular switches and logic gates, a new binaphthalene molecule with two spiropyran units (1) was synthesized and characterized. Absorption and 1H NMR spectral studies of 1 after reaction with acid/base indicate acidichromism can occur to compound 1. The synergistic actions of a…
The structural transformation and transformation kinetics of SbxSe100−x films (60⩽x⩽70) were studied to investigate the feasibility of applying SbxSe100−x alloys in phase change nonvolatile memories. Temperature-dependent van der Pauw measurements, x-ray diffraction, x-ray reflectometry, and a static tester were used…
Poly(styrene sulfonic acid) membranes (Neosepta CMX, Tokuyama Corp.) have been modified by in situ polymerization of aniline. (NH4)2S2O8, FeCl3, H2O2, and KIO3 were used as oxidizing agents, and two different modification methods (single-step versus two-step) were studied. The composite membranes were characterized by…
A large single crystal of barium tungstate (BaWO4) with dimensions of 22-mmdiameter×80-mm length was grown by the Czochralski method using an iridium crucible. The melting point, molar enthalpy of fusion, and molar entropy of fusion of the crystal were determined to be 1775.10 K, 96913.80Jmol−1, and 54.60JK−1mol−1, re…
Release rates of nonexchangeable potassium (K) were determined for 10 intensively cultivated soils of the Hamadan area in western Iran. Calcium (Ca)‐saturated soil samples were equilibrated with 0.01 M CaCl2 and 0.01 M citric acid for 2–2759 h. Plots of cumulative K+ released by different soils vs. time consisted of t…
Bioactive polyurethaneurea modified with polyethylene glycol (PEG) and the endothelial cell-adhesive peptide YIGSR was synthesized and fabricated into microporous scaffolds. This material has shown appropriate mechanical properties for vascular graft applications, resists platelet adhesion, and promotes endothelializa…
We study the vibrational energy diffusion in single-walled carbon nanotubes by using the molecular-dynamics method. It is found that energy transports ballistically at low temperature and superdiffusively at room temperature. The velocity of energy transport along the axis in carbon nanotube at room temperature is abo…
Moybdenum-based subnanometre diameter nanowires are easy to synthesize and disperse, and they exhibit a variety of functional properties in which they are superior to other one-dimensional materials. However, further progress in the understanding of physical properties and the development of new and specific applicati…
We succeeded in developing carbon nanotube (CNT) vias specifically adapted for the copper interconnect process used in ultra large-scale integrated circuits. The CNTs were grown selectively on titanium films using Co catalyst films. The use of tantalum enabled CNTs to be grown on Cu lines and prevented any increase in…
A systematic crystal-chemical investigation of orthorhombic holmquistites has been done to determine the reasons for their - limited compositional variations. Structural constraints to the relative stability of B Li amphiboles are also suggested by the occurrence of ferro- and feni-ferroclinoholmquistites, and the la…