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 large shear displacements of atomic layers in Gd5(SixGe1–x)4 materials, coupled with the change of crystallographic symmetry and magnetic order, characterizes these transformations as magnetic–martensitic, which are extremely rare. The start and the end of the magnetic–martensitic transitions depends strongly on t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFabrication of Novel Mesocellular Carbon Foams with Uniform Ultralarge MesoporesJinwoo Lee, Kwonnam Sohn, and Taeghwan HyeonView Author Information School of Chemical Engineering and Institute of Chemical Processes Seoul National University, Seoul 151-742, Korea Cite t…
Nanosized α-nickel hydroxide with an interlayer spacing of 7.2 Å has been synthesized with the aid of ultrasound radiation. This method was found to be a simple and convenient method to produce α-nickel hydroxide. The synthesized hydroxide was found to possess good stability in KOH medium and the material might be int…
Material design of GaN-based ferromagnetic diluted magnetic semiconductors is given based on ab initio calculations within the local spin density approximation. The electronic structure of 3 d -transition-metal-atom-doped GaN was calculated by the Korringa-Kohn-Rostoker method combined with the coherent potential appr…
Nanoparticles assembled from poly( d, l -lactic acid)−poly(ethylene glycol) (PLA−PEG) block copolymers may have a therapeutic application in site-specific drug delivery. A series of AB block copolymers based on a fixed PEG block (5 kDa) and a varying PLA segment (2−110 kDa) have been synthesized by the ring-opening po…
Real-time measurements of stress evolution during the deposition of Volmer–Weber thin films reveal a complex interplay between mechanisms for stress generation and stress relaxation. We observed a generic stress evolution from compressive to tensile, then back to compressive stress as the film thickened, in amorphous…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTControlled Synthesis of Multi-armed CdS Nanorod Architectures Using Monosurfactant SystemYoung-wook Jun, Sang-Min Lee, Nam-Jung Kang, and Jinwoo CheonView Author Information Department of Chemistry and School of Molecular Science BK21, Korea Advanced Institute of Scien…
Not to be confused with semiconductors, half metals belong to a new class of materials that look set to play a key role in next-generation electronic devices.
Se ha extendido en la actualidad el uso de materiales compuestos formados por resinas poliméricas o plásticos, reforzados con fibras de vidrio. de carbono o fibras de aramida, que alcanzan grandes resistencias, del mismo orden que la de los aceros, con una densidad mucho menor, algo más que la de la madera.
A series of mixed-ligand complexes of the formulae [Co (tyr)(gly)(H2O)2], [Co(tyr)(ala)(H2O)2], [Co(tyr)(thr)(H2O)2], [Co(tyr)(met)(H2O)2],[Ni(tyr)(gly)(H2O)2], [Ni(tyr)(ala) (H2O)2] and [Ni(tyr)(thr)(H2O)2], where tyr = L-tyrosine, gly = glycine, ala = alanine, thr = threonine, met = L-methionine has been prepared an…
A pyrolysis route has been used to synthesize arrays of highly aligned BxCyNz nanotubes in bulk. The structure and composition of the product were characterized by scanning electron microscopy, high-resolution transmission electron microscopy, and electron energy-loss spectroscopy. The length and diameter of the nanot…
The exciton–erbium coupling and the excitation dynamics of Er3+ in erbium-doped silicon-rich silicon oxide are investigated using time-resolved measurements of Er3+ luminescence. The dependence of the Er3+ luminescence on the pump power and duration indicates that the exciton–erbium coupling is dominant over carrier–e…
Ordered polymer microspheres were produced by photo-polymerizing reactive nematic liquid crystal droplets suspended in glycerol, thus capturing the mesogenic order indefinitely. The electro-optic switching of these structures suspended in a fluid is investigated and described by a simple phenomenological model.
The depth-resolved luminescence of the ZnO epilayer has been studied by using cathodoluminescence (CL) at room temperature. Other than the usual excitonic and deep level emissions, two peaks at 3.13 and 2.57 eV have been observed and are attributed to the defects. The variation of all the emission peaks has been exami…
A series of new poly(ether-ester-imide)s, PEEIs, was prepared from an imide dicarboxylic acid based on 1,4-diaminobutane and trimellitic anhydride. This imide dicarboxylic acid polycondensed with 1,4-dihydroxybutane formed the hard segments and poly(ethylene oxide), PEO-1000, or mixtures of PEO-1000 and poly(tetrameth…
We provide a possible formation mechanism for one of the Si-related paramagnetic centers in amorphous silica, Eα′, which is stable only below 200 K, on the basis of the quantum-chemical calculations. We show that the divalent Si defect can trap a hole, resulting in two different types of paramagnetic centers that are…
Layered double hydroxide of Mg-Al-carbonate system (MACH) was prepared and its heat-treated product (MACHT) was obtained by calcination at 500 degrees C. The resulting materials were used as an adsorbent for removal of color from synthetic textile wastewater (STW) and textile wastewater (TWW). Batch kinetic study show…
Potassium (K) is an essential plant nutrient. The K present in subsoil, either from leaching of the applied K or from genetic origin, would be available to plants in substantial amounts. A great majority of studies on K in soils have been solely concerned with samples collected from the surface soils (0–15 cm). The de…
The thermodynamic activities of SiO(2) in Al(2)O(3)-SiO(2) liquid slags were measured by the high-temperature Knudsen cell mass spectromeric method in the present work. The measurements were carried out in the temperature range 1863-2169 K. Tungsten crucibles were used to hold the slags. The system was calibrated usin…
Transport of positive charge deposited by a corona discharge on the open nitride surface of a silicon nitride (150 nm)/silicon oxide (300 nm) double layer on silicon substrate is studied by determining the location of the charge centroid with a capacitance–voltage method used in conjunction with surface-potential meas…