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 explored the effect of Cd substitution on the thermoelectric properties of PbTe in an effort to test a theoretical hypothesis that Cd atoms on Pb sites of the rock salt lattice can increase the Seebeck coefficient via the formation of a resonance level in the density of states near the Fermi energy. We find that th…
Recent advances in biotechnology demonstrate that peptides and proteins are the basis of a new generation of drugs. However, the transportation of protein drugs in the body is limited by their high molecular weight, which prevents the crossing of tissue barriers, and by their short lifetime due to immuno response and…
Self-healing materials are particularly desirable for load-bearing applications because they offer the potential for increased safety and material lifetimes. A furan-functionalized polymer network was designed that can heal via covalent bonding across the crack surface with the use of a healing agent consisting of a b…
Over a number of years work in our laboratory has been developing new chemistry for the use of cellulose nanocrystals (CNCs) as scaffolds for the creation of nanomaterials with novel, stimuli responsive characteristics. Our work takes advantage of the rigid nature of CNCs, the unique nanopattern etched on their surfac…
Magnesium−aluminum double oxides derived from the thermal treatment of layered hydroxides (hydrotalcites) have been tested for CO 2 adsorption. The effects of various preparation parameters, such as the incorporated cation (K or Na), the mode of addition of magnesium and aluminum precursors, the presence of sonication…
This article presents a basic probabilistic theory for the nucleation of deformation twins in hexagonal close packed (HCP) metals. Twin nucleation is assumed to rely on the dissociation of grain boundary defects (GBDs) under stress into the required number of twinning partials to create a twin nucleus. The number of s…
We have developed a novel surface coating for semiconductor quantum dots (QDs) based on a heterobifunctional ligand that overcomes most of the previous limits of these fluorescent probes in bioimaging applications. Here we show that QDs capped with bidentate zwitterionic dihydrolipoic acid-sulfobetaine (DHLA-SB) ligan…
Ca/Na montmorillonite and natural Wyoming bentonite (MX-80) have been studied experimentally and theoretically. For a clay system in equilibrium with pure water, Monte Carlo simulations predict a large swelling when the clay counterions are monovalent, while in presence of divalent counterions a limited swelling is ob…
Abstract Excavated archaeological silver objects often exhibit extended intergranular degradation. This failure is most probably caused by the localised corrosion of highly copper‐segregated grain boundaries in case of a AgCu base alloy during burial for more than 1000 years in graves. Detailed electron backscatter d…
Abstract We have analyzed spin quenching of first row transition metals deposited on (001) defect‐free and defect‐containing surfaces of MgO insulator and CdO semiconductor by means of density functional calculations and embedded cluster model. Clusters of moderate sizes were embedded in the simulated Coulomb fields t…
The maximum entropy method (MEM) has been used to determine electron density in superspace of incommensurately modulated chromium pyrophosphate from X-ray diffraction data measured by Palatinus et al. [(2006), Acta Cryst. B62, 556-566]. Chromium pyrophosphate, Cr(2)P(2)O(7), contains ordered regions (83% of the volume…
Abstract We studied the Seebeck coefficient S of sputtered Zn 0.98 Al 0.02 O samples with free carrier concentrations varying from 10 18 to 10 21 cm –3 . The temperature dependence of the Seebeck coefficient at low carrier concentrations exhibits typical semiconductor behavior (S < 0 and pronounced phonon drag belo…
Combustion synthesis of Ti 3 SiC 2 /TiC composites from 3Ti/ x Si/2C ( x =1, 1.1, 1.2) powders was conducted under high‐gravity conditions with gravity up to 895 G. The results showed that the phase composition of the products strongly depended on the gravity level. We find that high‐gravity synthesis favors the growt…
Abstract This study reports surface characterizations of Pd/LaFeO 3 catalysts after aging in diesel engine simulated conditions. Thermal aging and support‐induced effects on the nature of Pd species were investigated. LaFeO 3 was prepared via a sol–gel method to promote relatively high specific surface area (19 m 2 g…
We demonstrate that excitons in semiconductor alloys are subject to competing localization effects due to disorder (random potential fluctuations) and shallow point defects (impurities).The relative importance of these effects varies with alloy chemical composition, impurity activation energy as well as temperature.We…
We describe here the facile methods for the stepwise regulation of the formation of tetrathiafulvalene (TTF) radical cation and the self-assembly to the mixed-valence state of TTF in various polymer films. The homogeneous polymer composites containing TTF and (1R)-3,3-dimethylbicyclo[2.2.1]hepta-2-one-1-triflate as a…
The ground-state structure, equilibrium structural parameters, electronic structure, and thermodynamical properties of MCaH(3) (M=Li, Na, K, Rb, and Cs) phases have been investigated. From the 104 structural models used as inputs for structural optimization calculations, the ground-state crystal structures of MCaH(3)…
We propose a class of antireflecting structures that can effectively suppress reflections for binary diffractive optics. In this structure, multiple periodic thin films with gradually varying refractive indices are used to shift all reflected diffraction to the transmitted orders. The structure is optimized to operate…
By altering the temperature and solvents, we have synthesized hydrated and dehydrated Eu 3+ /Tb 3+ ‐doped REPO 4 (RE=Y, La, and Gd) nanophosphors via a solvo‐thermal technology. X‐ray powder diffraction and scanning electronic microscopy reveal that they have different structures and different morphologies. REPO 4 pre…
A light in the dark: The structure of the mysterious dark conglomerate (DC) phase—probably the first example of chiral segregation in an isotropic fluid smectic—was recently elucidated by an international research team. The new findings (see picture, reprinted with permission and reproduced from Science 2009, 325, 452…