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 magnetic exchange interactions in a C0(3)(11) moiety encapsulated in Na(17) [(NaOH(2))Co(3)(H(2)O)(P(2)W(15)O(56))(2)] (NaCo(3)) were studied by a combination of magnetic measurements (magnetic susceptibility and low-temperature magnetization), with a detailed Inelastic Neutron Scattering (INS) investigation. The…
The reversible swelling behavior of multilayer films containing hyaluronic acid and polyallylamine hydrochloride was investigated using in situ ellipsometry, since many of the natural functions and applied uses of hyaluronic acid are related to the extraordinary ability of this biopolymer to swell, and to respond conf…
The ligand 2,6-dimethylphenylisocyanide (CNx) forms six complexes of the formula [Re(CO)3(CNx)(L)]+, where L = 1,10-phenanthroline (1), 5-chloro-1,10-phenanthroline (2), 5-nitro-1,10-phenanthroline (3), 5-methyl-1,10-phenanthroline (4), 5,6-dimethyl-1,10-phenanthroline (5), and 1,10-phenanthrolinopyrrole (6). The lowe…
Collision cascades are investigated in MgO at energies ranging from $400\phantom{\rule{0.3em}{0ex}}\mathrm{eV}\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}5\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$. Initial energy is imparted to the principle knock-on atom in the lattice and the cascade development is…
The deformation mechanism of body-centered cubic (bcc) nanocrystalline tantalum with grain sizes of 10–30 nm is investigated by nanoindentation, scanning electron microscopy and high-resolution transmission electron microscopy. In a deviation from molecular dynamics simulations and existing experimental observations o…
Controlled assembly of protein–nanoparticle composites through complementary protein surface recognition is demonstrated. Interaction of an unstable protein (chymotrypsin) with a gold nanoparticle results in close interparticle spacing, while a stable protein (cytochrome C) that retains its structure upon binding prod…
Clay minerals in the mud and soil that coat the Earth's surface are part of a clay cycle that breaks down and creates rock in the crust. Clays generated by surface weathering and shallow diagenetic processes are transformed into mature clay mineral assemblages in the mudrocks found in sedimentary basins. During metamo…
The preparation of ordered mesoporous boron nitride (BN) by using trimethylaminoborazine as a BN source and mesoporous carbon CMK-3 as a template is reported. X-ray diffraction, transmission electron microscopy, and pore size analysis show that the structure of the synthesized BN molecular sieves consists of a two-dim…
Ultrafast photoinduced spin dynamics has been investigated by time-resolved magneto-optical Kerr spectroscopy for various ferromagnetic and ferrimagnetic compounds: ${\mathrm{F}\mathrm{e}\mathrm{C}\mathrm{r}}_{2}{\mathrm{S}}_{4}$, ${\mathrm{C}\mathrm{o}\mathrm{C}\mathrm{r}}_{2}{\mathrm{S}}_{4}$, ${\mathrm{C}\mathrm{u}…
Colloidal nickel (Ni) nanocrystals were used to direct the synthesis of crystalline silicon (Si) nanowires in an organic solvent. The reaction temperatures ranged from 400 degrees C to 520 degrees C with pressures from 14.3 to 23.4 MPa, conditions that are well above the critical point of the solvent. The Ni nanocryst…
Self-assembled silicon nanotubes (SiNTs) are synthesized by a hydrothermal method, with silicon monoxide powder as a starting material and de-ionized water as a reaction medium. No metallic catalysts are added during the process. Unlike the disordered, aggregated SiNTs grown by the template method, the SiNTs synthesiz…
Semiconducting β-SiC nanowires encapsulated in BN nanotubes are prepared using chemical vapor deposition (see Figure). An unusual feature—a gap of 10–15 nm in width between the inner wall of the BN tube and the SiC nanowire—allows various chemical and morphological modifications to be performed on the nanowires.
Electrical spin injection from the Heusler alloy Co2MnGe into a p-i-nAl0.1Ga0.9As∕GaAs light emitting diode is demonstrated. A maximum steady-state spin polarization of approximately 13% at 2 K is measured in two types of heterostructures. The injected spin polarization at 2 K is calculated to be 27% based on a calibr…
The energetics of point defects in oxide materials plays a major role in determining their high-temperature properties, but experimental measurements are difficult, and calculations based on density functional theory (DFT) are not necessarily reliable. We report quantum Monte Carlo (QMC) calculations of the formation…
A simple method for penetrating the barrier layer of an anodic aluminum oxide (AAO) film and for detaching the AAO film from residual Al foil was developed by reversing the bias voltage in situ after the anodization process is completed. With this technique, we have been able to obtain large pieces of free-standing AA…
Three of a kind: Trifunctional nanospheres (TFNs) were constructed by conjugating folic acid to the surface of fluorescent and magnetic bifunctional nanospheres (see microscope images). The TFNs were initially incubated with either normal or cancerous cells to investigate the capture of specific cells. Then, captured…
Polymer-free carbon nanotube fibers are spun from aqueous dispersions using a flocculation-based process that was developed. It produces hollow fibers, folded ribbon fibers, and solid fibers (see Figure). The fibers spun from single-walled nanotubes exhibit relatively high electrical conductivities (∼140 S cm–1 at roo…
Quantum dynamics of a two-state spin system in a rotating magnetic field has been studied. Analytical and numerical results for the transition probability have been obtained along the lines of the Landau-Zener-Stueckelberg theory. The effect of various kinds of noise on the evolution of the system has been analyzed.
The transport properties of diluted magnetic semiconductors (DMS) are calculated using dynamical mean field theory (DMFT) and Boltzmann transport theory. Within DMFT we study the density of states and the dc-resistivity, which are strongly parameter dependent such as temperature, doping, density of the carriers, and t…
Prospect Research on the Diversity of Extracellular Mineralization Process Induced by Mineralizing Microorganisms and Its Use as a Treatment for Soil Pollutants,