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 unexpected SOFC hetero-epitaxial system with large lattice mismatch is demonstrated. A (110)-oriented flat epitaxial film of Nd2NiO4+δ is successfully grown on the (100) surface of yttrium-stabilized zirconia, which realizes selective exposure of the active surface for oxygen reduction. The charge-transfer process…
Using simultaneous imaging and structural fingerprinting under reaction conditions, we probe the initial oxidation pathway and CO oxidation catalysis on Ru(0001). Oxidation beyond an initial $(1\ifmmode\times\else\texttimes\fi{}1)\text{-O}$ adlayer phase produces a heterogeneous surface, comprising a disordered trilay…
Accurate potential energy surface calculations are presented for many of the key steps involved in diamond chemical vapor deposition on the [100] surface (in its 2 x 1 reconstructed and hydrogenated form). The growing diamond surface was described by using a large (approximately 1500 atoms) cluster model, with the key…
We investigate the influence of space curvature, and of the associated frustration, on the dynamics of a model glass former: a monatomic liquid on the hyperbolic plane. We find that the system's fragility, i.e., the sensitivity of the relaxation time to temperature changes, increases as one decreases the frustration.…
Resonant 2p x-ray absorption spectra of size-selected transition metal ions and clusters consisting of 1<or=n<or=200 atoms are reported. Remnants of atomic multiplet splitting in L(2,3)-edge x-ray absorption can be resolved up to the trimer, above which the overall line shape is already bulklike. A strong cluster size…
Anodic alumina thin-film templates of unprecedented quality are fabricated on ITO/glass, silicon, and flexible substrates over 2 cm2 areas, of interest for devices. For the first time, free-standing nanorods of a variety of oxides and metals are reproducibly synthesized over large areas on ITO/glass by electrochemical…
Nanomaterials and their associated technologies hold promising opportunities for the development of new materials and applications in a wide variety of disciplines, including medicine, environmental remediation, waste treatment, and energy conservation. However, current information regarding the environmental effects…
We use powder neutron diffraction to study the spin and lattice structures of polycrystalline samples of nonsuperconducting PrFeAsO and superconducting ${\text{PrFeAsO}}_{0.85}{\text{F}}_{0.15}$ and ${\text{PrFeAsO}}_{0.85}$. We find that PrFeAsO exhibits abrupt structural phase transitions at 153 K followed by static…
Severe plastic deformation (SPD) of titanium creates an ultrafine-grained (UFG) microstructure which results in significantly enhanced mechanical properties, including increasing the high cycle fatigue strength. This work addresses the challenge of maintaining the high level of properties as SPD processing techniques…
PbTe nanowires (NWs) with controlled size, e.g., diameter 10∼30 nm and length 500∼3000 nm, have been synthesized by the simple solvothermal approach. The size and morphology of the NWs can be tuned with respect to the synthesis conditions. Very high p-type seebeck coefficients >470 μV/K at T = 375−425 K were obtained…
The biomass-based monomer isosorbide was incorporated into poly(butylene terephthalate) (PBT) by solid-state polymerization (SSP) using the macrodiol monomer BTITB-(OH) 2, which consists of isosorbide (I), terephthalic acid (T), and 1,4-butandiol (B) residues. This macromonomer can be synthesized by a simple one-pot,…
The relationship between molecular conductance and molecular structure is an important issue in molecular electronics. Photochromic molecules can interconvert their molecular structures by light, so that the molecular conductance should be photocontrolled. According to this strategy the networks composed of photochrom…
The common approach to crack dynamics, linear elastic fracture mechanics (LEFM), assumes infinitesimal strains and predicts a $r^{-1/2}$ strain divergence at a crack tip. We extend this framework by deriving a weakly nonlinear fracture mechanics theory incorporating the leading nonlinear elastic corrections that must…
We present high resolution measurements of the displacement and strain fields near the tip of a dynamic (Mode I) crack. The experiments are performed on polyacrylamide gels, brittle elastomers whose fracture dynamics mirror those of typical brittle amorphous materials. Over a wide range of propagation velocities ($0.2…
Brilliant orbs: A facile and highly efficient synthetic strategy combines evaporation-induced assembly and acetic acid mediated sol–gel chemistry for the production of various single- and multicomponent mesoporous metal oxide spheres. These spheres, which are micrometer-sized and have high surface areas and high frame…
The rigid amorphous fraction in isotactic polypropylene is comprehensively analyzed as a function of the history of crystallization. The crystallinity, crystal morphology, and superstructure were independently and precisely controlled by the rate of cooling on melt crystallization and by the temperature/time of subseq…
Many materials science phenomena are dominated by activated diffusion processes and occur on time scales that are well beyond the reach of standard molecular-dynamics simulations. Kinetic Monte Carlo (KMC) schemes make it possible to overcome this limitation and achieve experimental time scales. However, most KMC appr…
Abstract The exoskeleton of the American lobster Homarus americanus is a hierarchical nanocomposite consisting of chitin–protein fibers, reinforced with amorphous calcium carbonate (ACC) and a small amount of crystalline calcite. Crystallographic pole‐figure analysis reveals two texture components of the crystalline α…
First nearest-neighbor models are routinely used for atomistic modeling of covalent materials. Neighbors are usually determined by looking for atoms within a fixed interaction range. While these models provide a faithful description of material properties near equilibrium, the limited interaction range introduces prob…
Optical properties of two-dimensional massless Dirac fermions are considered by the formalism of pseudospin precession equations which provides an easy and natural semiphenomenological way to include correlation effects. It is shown that the latter are negligible, with the only assumption that the system under conside…