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。
OBJECTIVES: Nephrogenic systemic fibrosis (NSF) is a rare acquired disorder that was first recognized in 1997. Presented is a retrospective review of 6 cases of NSF diagnosed by skin biopsy in our institution during the past 4 years and their relationship to gadodiamide exposure. METHODS AND RESULTS: Patient age range…
PEO-PPO-PEO/PEG shell cross-linked nanocapsules encapsulating an oil phase in their nanoreservoir structure was developed as a target-specific carrier for a water-insoluble drug, paclitaxel. Oil-encapsulating PEO-PPO-PEO/PEG composite nanocapsules were synthesized by dissolving an oil (Lipiodol) and an amine-reactive…
First-principles calculations of Cu(001) free-standing thin films have been performed to investigate the oscillatory quantum size effects exhibited in surface energy, work function, atomic relaxation, and adsorption energy of the cesium adsorbate. The quantum well states have been shown and clarified at particular $k$…
Water-dispersed nanocrystals with high photoluminescence quantum yield (PLQY) and narrow size distribution are desirable for a variety of bioapplications. In this report, we present a facile method assisted by microwave irradiation for rapidly synthesizing high-quality CdTe nanocrystals in aqueous phase. The PLQY of C…
Novel nanocomposites of gold nanoparticle and poly(4-vinylpyridine) (Au@PVP) were fabricated through surface-initiated atom-transfer radical polymerization (SI-ATRP) at ambient conditions. The citrate-stabilized gold nanoparticles were first modified by a disulfide initiator for ATRP initiation, and the following poly…
Colloidal cerium oxide (CeO2) nanocrystals prepared by hydrothermal synthesis were characterized by high-resolution transmission electron microscopy (HRTEM) and three-dimensional electron tomography (3D-ET). HRTEM images of individual CeO2 nanocrystals were then simulated by Blochwave and multislice simulations to det…
The self-limiting reaction of aqueous permanganate with carbon nanofoams produces conformal, nanoscopic deposits of birnessite ribbons and amorphous MnO2 throughout the ultraporous carbon structure. The MnO2 coating contributes additional capacitance to the carbon nanofoam while maintaining the favorable high-rate ele…
We present Raman spectroscopy measurements on single- and few-layer graphene flakes. By using a scanning confocal approach, we collect spectral data with spatial resolution, which allows us to directly compare Raman images with scanning force micrographs. Single-layer graphene can be distinguished from double- and few…
Thermally stimulated relaxation of x-ray irradiation-induced defects in a K-feldspar crystal, Or 93 ± 2 Ab 7 ± 2 , from Minas Gerais (Brazil), has been studied from the blue light emission obtained with a high sensitivity thermoluminescence spectrometer. Diffractometric analysis shows a small but observable departure…
The effects, caused by the geometric structure and an electric field (E), on the electronic and optical properties of quasi-zero-dimensional finite carbon nanotubes are explored by employing the tight-binding model coupled with curvature effects. Electronic properties (state energies, symmetry of electronic states, en…
The impurity displacements and the g factors g(parallel to) and g(perpendicular to) of the two tetragonal Ni3+ centres (I and II) in SrTiO3 are theoretically investigated by using the perturbation formulae of the g factors for a 3d(7) ion with low spin (S = 1/2) in tetragonally distorted octahedra. In these formulae,…
We have developed a new lateral standard on the nanometre scale for use with the recently introduced high-resolution optical microscopy techniques such as deep ultraviolet microscopy (DUVM) and confocal laser scanning microscopy (CLSM). The standard provides structures in the submicron- and sub-100 nm scale, and meets…
It is shown that samples of microcrystalline tetragonal chicken egg white lysozyme can be effectively cryoprotected for high-resolution synchrotron X-ray powder diffraction studies at 100 K. The survival of the powder in the beam is increased by a factor of around 30. Thus, a high-quality powder diffraction pattern co…
Measurements of the global conformation of macromolecules can be carried out using small-angle X-ray scattering (SAXS). Glass focusing capillaries, manufactured at the Cornell High Energy Synchrotron Source (CHESS), have been successfully employed for SAXS measurements on the heme protein cytochrome c . These capillar…
Nitrogen‐rich Ca–α‐SiAlON ceramics with nominal compositions Ca x Si 12−2 x Al 2 x N 16 and 0.2≤ x ≤2.6, extending along the Si 3 N 4 –1/2Ca 3 N 2 :3AlN tie line, were prepared from Si 3 N 4 , AlN, and CaH 2 precursors by hot pressing at 1800°C. The x values attained were determined by energy‐dispersive X‐ray (EDX) mi…
The electric-field-induced mechanical resonance of an individual nanotube (NT) or nanowire (NW) has been utilized as a versatile technique for in situ measurement of the Young's modulus of the NT/NW in electron microscopes. The key step of this technique is to determine the fundamental natural frequency of the NT/NW.…
High Resolution Image Download MS PowerPoint Slide An enthalpy of adsorption of ca. −10 kJ/mol was theoretically predicted for the interaction of molecular hydrogen with Mg-exchanged low silica chabazite (Si/Al = 5/1), which is significantly higher than the theoretical prediction for alkali-metal-exchanged chabazites…
Copper oxide nanocrystals decorated on multi-wall carbon nanotubes have been prepared. Comprehensive morphological, structural and spectroscopical studies have been carried out on the nanometre/atomic scale by the combination of high-resolution transmission electron microscopy and electron energy-loss near-edge struct…
The properties of Nd 2 CoMnO 6+δ (δ = 0, 0.12) samples were investigated by Mössbauer, μSR and magnetization measurements. Our experimental data were interpreted in the following model. The samples consist mainly of clusters of cobalt and manganese ions with different degrees of order. The valence state of these ions…
The evolution of carbon (C) and nitrogen (N) in a spent (coked) fluid catalytic cracking (FCC) catalyst was investigated during regeneration. A commercial spent FCC catalyst from one refinery was submitted to calcination procedures with air, and samples were collected at different temperatures and times. These were an…