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。
ADVERTISEMENT RETURN TO ISSUEArticleNEXTRole of the Surface in Luminescent ProcessesBillie L. Abrams and Paul H. HollowayView Author Information Sandia National Laboratories, P.O. Box 5800-1421, Albuquerque, New Mexico 87185, and Department of Materials Science and Engineering, University of Florida, P.O. Box 116400,…
We present a time-dependent Ginzburg-Landau model of nonlinear elasticity in solid materials. We assume that the elastic energy density is a periodic function of the shear and tetragonal strains owing to the underlying lattice structure. With this new ingredient, solving the equations yields formation of dislocation d…
One of the major industrial challenges is to profit from some fascinating physical features present at the nanoscale. The production of dissipationless nanoswitches (or nanocontacts) is one of such attractive applications. Nevertheless, the lack of knowledge of the real efficiency of electronic ballistic/non dissipati…
We apply a Langevin model to investigate the nonlinear ac responses of electro-magnetorheological (ERMR) fluids under the application of two crossed dc magnetic (z axis) and electric (x axis) fields and a probing ac sinusoidal magnetic field. We focus on the influence of the magnetic fields which can yield nonlinear b…
The p-electrons of carbon in the interstitial compound Fe3C hybridize with the Fe d-band and enhance the valence electron concentration of Fe from 8 to 8.67. At this concentration, substitutional 3d transition metals and alloys exhibit strong moment-volume coupling phenomena and associated magnetovolume instabilities,…
A novel and effective protocol for the surface modification and quantitative characterization of magnetic polymeric nanospheres prepared by miniemulsion polymerization is reported. Composite nanospheres consisting of polymer-coated iron oxide nanoparticles were prepared by the miniemulsion polymerization of methyl met…
Shear-induced phase separation was found in "nonentangled" oligomer mixture. The sheared mixture in one phase becomes turbid and its scattering pattern exhibits so-called "butterfly pattern" which is commonly observed in shear-induced phase separation of semidilute polymer solutions. The origin of the shear-induced ph…
Zink macht einen Unterschied: Die neuen Komplexe [(3,5-Me2C5H3N)2Zn(ESiMe3)2] (1: E=Se, 2: E=Te, siehe Bild, Te rot, Zn blau, Si gelb, N grün) erwiesen sich als gute Reagentien für die Erzeugung von ternären MM′E-Materialien. Aus 2 wurde der ternäre ZnCdTe-Nanocluster [Zn2.6Cd7.4Te4(TePh)12(PnPr3)4] hergestellt. Seine…
Using density functional theory, we have theoretically studied sidewall functionalization of carbon nanotubes (CNT) with a nucleophilic organic carbene, dipyridyl imidazolidene (DPI). When compared to the dissociated system, formation of the adduct from defect-free (5,5) tube and the DPI is weakly exothermic. However,…
This investigation has been performed to test the feasibility of using K2YF5:Tb3+ crystals as thermoluminescence dosemeters (TLD). K2YF5 single crystals doped with 0.2, 10.0 and 50.0 at.% of trivalent optically active Tb3+ ions as well as K2TbF5 and undoped K2YF5 crystals have been synthesized under hydrothermal condi…
Micron-sized water droplets in a cryogenic flow tube were probed by IR spectroscopy. The analysis of the IR spectra suggests that there is a relative increase of about 30% in the fraction, f(L), of low density domains in water on cooling over the temperature range between 300 and 240 K. The results derived from the ex…
The Smoluchowski equation for irreversible aggregation in suspensions of equally charged particles is studied. Accumulation of charges during the aggregation process leads to a crossover from power-law to sublogarithmic cluster growth at a characteristic time and cluster size. For larger times the suspension is usuall…
Leuchtendes Beispiel: Die optischen Eigenschaften von lumineszierenden Nanokristallen (quantum dots, QDs) können meist nur genutzt werden, wenn ihre Oberfläche geeignet derivatisiert ist. Es wird eine einfache Methode vorgestellt, um einzelne QDs unter Erhaltung ihrer Lumineszenzeigenschaften gleichmäßig mit amorphem…
That zinc in feeling: The complexes [(3,5-Me2C5H3N)2Zn(ESiMe3)2] (E=Se, 1; E=Te, 2) are prepared and found to be good reagents for the generation of ternary MM′E materials. From 2 (see structure; Te red, Zn blue, Si yellow, N green), the ternary ZnCdTe nanocluster [Zn2.6Cd7.4Te4(TePh)12(PnPr3)4] (3) is prepared. The o…
Abstract Poly( O ‐anisidine) coating was successfully electrodeposited onto Al‐2024. Cyclic voltammetry and reflection absorption infrared spectroscopy (RAIR) analysis were carried out in order to fully understand the formation and structure of the resulting polymer coating. RAIR spectrum showed the characteristics pe…
We report a numerical study of saddles properties of the potential energy landscape for soft spheres with different softness, i.e., different power n of the interparticle repulsive potential. We find that saddle-based quantities rescale into master curves once energies and temperatures are scaled by mode-coupling temp…
Large scale molecular dynamics and grand canonical Monte Carlo simulation techniques are used to study the behavior of the interdiffusion of a solvent into an entangled polymer matrix as the state of the polymer changes from a melt to a glass. The weight gain by the polymer increases with time t as t(1/2) in agreement…
Platinum nanoparticles, nanorods, and nanonetworks were fabricated in mesoporous silica MCM-48. Investigations including transmission electron microscopy (TEM) with electron diffraction, powder X-ray diffraction (PXRD) with Rietveld analysis, and extended X-ray absorption fine structure analysis (EXAFS) suggest the cr…
We investigate the structure and elastic properties of the amorphous high-temperature ceramic $a$-${\mathrm{Si}}_{3}{\mathrm{B}}_{3}{\mathrm{N}}_{7}$. Several different structural models are generated and their properties such as the radial and angular distribution functions, the degree of local order, the density, th…
Acoustical measurements, electron spin resonance, and Raman spectroscopy have been employed to probe sulfur over the temperature range 80-180 degrees C, which includes the polymerization transition and the supercooled liquid state. Acoustical properties (sound velocity, absorption, and impedance) have been studied wit…