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。
(111) diamond microcrystals and (100) diamond microcrystals and nanorods were synthesized on Si substrate by hot cathode direct current plasma chemical vapor deposition method. The morphology, structure, and optical properties of the diamond films were characterized by scanning electron microscopy, X-ray diffraction,…
The enzyme carbonic anhydrase (CA) plays a key role in the acquisition of inorganic carbon for photosynthesis in phytoplankton. Genes coding for the carbonic anhydrase CDCA, which can use either Cd or Zn as a metal center, are found in many diatom species and in natural seawater samples. The use of Cd in CDCA is the o…
In this paper, we compare the stability of silver nanoparticles fabricated by nanosphere lithography (NSL) and those coated with atomic layers of Al 2 O 3 to femtosecond laser pulses. Structural changes in the nanoparticles caused by the laser pulses were monitored by UV−vis extinction spectroscopy. It is demonstrated…
Abstract We show surface-enhanced Raman scattering (SERS) on an ordered array of Au nanodots prepared from a highly ordered anodic porous alumina mask. The intensity of SERS signals is strongly dependent on the height of the Au dots, indicating the existence of optimum geometrical structures for SERS. The fabrication…
We present low energy electron microscope (LEEM) spectromicroscopy studies of surface plasmons, localized on micro- and nanoscale epitaxial Ag islands. Excellent agreement is found in a direct comparison of wave vector dependent plasmon intensity with theory, demonstrating that high quality quantitative data can be ob…
Hydroxylapatite (HA) nanoparticles were conjugated with quantum dots (QDs) for in vivo imaging. The surface structures of HA nanoparticles with conjugated quantum dots (HA-QD) were studied by transmission electron microscopy (TEM) and laser fluorescent spectroscopy. The TEM data showed that the quantum dots were well…
The excited state absorption (ESA) spectra of ZBLAN glass activated by trivalent holmium ions have been measured in a wide spectral range (550–1750 nm) and simulated using such theoretical tools as the Judd–Ofelt formalism and McCumber theory of stimulated emission. We also propose a systematic approach for prediction…
A single-crystalline ZnO nanorod array with rectangular cross-sections has been synthesized, in which the as-obtained products are a complete metastable zinc blende (ZB) phase. X-ray powder diffraction, electron microscopy, and elemental maps have been used to show that the ZB-ZnO samples have a lattice constant a = 4…
A new method for perforating the barrier oxide at the base of pores in alumina, which does not involve etching of the alumina, is reported. Anodization of Al layers on W leads to formation of WO3 “plugs” that can be selectively etched without widening the as-anodized pores. We demonstrate this technique, used with tem…
This paper describes a bidirectionally coupled magnetoelastic model, BCMEM. BCMEM is a 3D nonlinear finite element-based model comprising magnetic and elastic boundary value problems (BVPs) that are bidirectionally coupled through stress and field dependent coupling variables—magnetostriction and magnetization. The co…
Based on density functional theory and thermodynamic model, we compile a phase diagram for the polar NiO(111) surface as a function of temperature and oxygen pressure. The electronic correlation between Ni-3d electrons has also been included in the form of GGA+U method. Consistent with recent experiments, present GGA+…
Long range orientational ordering within C(60) monolayers is observed on p-sexithiophene (6P) monolayer nanostripes on Ag(111) at 77 K. Low-temperature scanning tunneling microscopy studies reveal that the C(60)-6P intermolecular interaction constrains all C(60) molecules to adsorb on their hexagons atop 6P molecules.…
Analytical target cascading (ATC) is an effective decomposition approach used for engineering design optimization problems that have hierarchical structures. With ATC, the overall system is split into subsystems, which are solved separately and coordinated via target/response consistency constraints. As parallel compu…
The magnetocaloric response of an ensemble of oriented uniaxial magnetic objects, perpendicularly magnetized to their easy axes, for temperatures close to the blocking temperature is calculated with the aim of demonstrating that the control of the sample's microstructure makes up an effective way to tailor its magneto…
An angle-dependent interatomic potential has been developed for the Cu-Ta system by crossing two existing potentials for pure Cu and Ta. The cross-interaction functions have been fitted to first-principles data generated in this work. The potential has been extensively tested against first-principles energies not incl…
Surface plasmon resonance measurements and magnetic characterization studies have been carried out for two types of thiol-capped gold nanoparticles (NPs) with similar diameters between 2.0 and 2.5 nm and different organic molecules linked to the sulfur atom: dodecanethiol and tiopronin. In addition, Au NPs capped with…
High-temperature relaxor ferroelectric behavior (Tm ∼ 550 K) is reported for the rutile-based oxide, FeTiTaO6. Our investigations of the structure and dielectric properties of MTiTaO6 (M = Al, Cr, Fe) have revealed that all the oxides possess disordered rutile structure but only the iron member shows a strong relaxor…
Attempts to design peptide-based fibers from first principles test our understanding of protein folding and assembly, and potentially provide routes to new biomaterials. Several groups have presented such designs based on alpha-helical and beta-strand building blocks. A key issue is this area now is engineering and co…
Novel Au-induced polyvinylpyrrolidone (PVP) aggregates with bound water (PVP-water) were created for the highly shape-selective synthesis of distinctive silica nanostructures, such as core-shell spheres, rods, snakes, tubes, capsules, thornlike, and dendritic morphologies. A water/PVP/n-pentanol system was first desig…
Wechselhafte Farbstoffe: Am Kern nicht substituierte Perylenbisimid-Farbstoffe mit Melamin-Einheit lagern sich über Wasserstoffbrücken mit Cyanuraten zu H- (rot, siehe Bild) und J-Aggregaten (grün) zusammen. Beim Erwärmen in Lösung ändert sich die Packung dieser Aggregate, und das Kratzen von Filmen führt zu einem Far…