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。
Amido-amine-functionalized multiwalled carbon-nanotube fillers fundamentally alter the fracture and fatigue behavior of a thermosetting epoxy by initiating crazing in the material (see image). The crazing results in over an order of magnitude reduction in fatigue crack growth rates and significant improvements in frac…
Single wall carbon nanotubes grown entirely from 13C form an ideal system to study the effect of electron interaction on nuclear magnetism in one dimension. If the electrons are in the metallic, Luttinger liquid regime, we show that even a very weak hyperfine coupling to the 13C nuclear spins has a striking effect: Th…
A uniform ferrite-loaded open waveguide structure with composite right/left-handed (CRLH) response and its application to a novel backfire-to-endfire leaky-wave antenna are presented. The structure consists of a ferrite-filled rectangular waveguide open to free space at one of its small sides and biased perpendicularl…
The dipole polarizabilities, dipole moments, density of states, and second-order nonlinear optical (NLO) properties of organoimido derivatives of hexamolybdates have been investigated by using time-dependent density functional response theory. This class of organic-inorganic hybrid compounds possesses remarkably large…
Using first-principles electronic structure calculations we find that the titanium vacancy and divacancy may be responsible for the unexpected ferromagnetism in undoped anatase ${\text{TiO}}_{2}$. An isolated titanium vacancy produces a magnetic moment of $3.5{\ensuremath{\mu}}_{B}$, and an isolated titanium divacancy…
Uniform Gd(OH) 3 nanotubes have been prepared via a simple wet-chemical route at ambient pressure and low temperature, without any catalysts, templates, or substrates, in which Gd(NO 3 ) 3 was used as the gallium source and ammonia as the alkali. SEM and TEM images indicate that the as-obtained Gd(OH) 3 entirely consi…
Growth of ${\text{BaMn}}_{2}{\text{As}}_{2}$ crystals using both MnAs and Sn fluxes is reported. Room-temperature crystallography, anisotropic isothermal magnetization $M$ versus field $H$ and magnetic susceptibility $\ensuremath{\chi}$ versus temperature $T$, electrical resistivity in the $ab$ plane $\ensuremath{\rho…
Starting from Maxwell's equations, we use the reductive perturbation method to derive a second-order and a third-order nonlinear Schrödinger equation, describing ultrashort solitons in nonlinear left-handed metamaterials. We find necessary conditions and derive exact bright and dark soliton solutions of these equation…
Charge redistribution at high-Tc superconductor interfaces and grain boundaries on the one hand is problematic for technological application. On the other hand, it gives rise to a great perspective for tailoring the local electronic states. For prototypical (metallic) interfaces, we derive quantitative results for the…
Abstract From nanocrystals to atomic clusters : Fluorescent gold clusters (Au 8 ) are synthesized by etching gold nanocrystals with the assistance of biomolecules, such as amino acids, peptides, proteins, and DNA (see picture). The gold clusters exhibit strong blue fluorescence as well as solvent‐dependent emission pr…
In the drive toward improved electrical energy storage for applications ranging from wireless devices to electric vehicles to grid stabilization, nanoscale materials are of growing interest as ion storage electrodes. Nanoscale olivines based on Li M PO 4 ( M = Fe, Mn, Co, Ni) are one class of compounds for which recen…
The ground-state properties of the ferromagnetic shape-memory alloy of nominal composition ${\text{Ni}}_{2}{\text{Mn}}_{1.36}{\text{Sn}}_{0.64}$ have been studied by dc magnetization and ac susceptibility measurements. Like few other Ni-Mn based alloys, this sample exhibits exchange bias phenomenon. The observed excha…
Kinetics, biodistribution, and histological studies were performed to evaluate the particle-size effects on the distribution of 15 nm and 50 nm PEG-coated colloidal gold (CG) particles and 160 nm silica/gold nanoshells (NSs) in rats and rabbits. The above nanoparticles (NPs) were used as a model because of their impor…
Palladium-modified activated carbon fibers (Pd-ACF) are being evaluated for adsorptive hydrogen storage at near-ambient conditions because of their enhanced hydrogen uptake in comparison to Pd-free ACF. The net uptake enhancement (at room temperature and 2 MPa) is in excess of the amount corresponding to formation of…
A new anodization method, termed cyclic anodization, is presented for the controlled modulation of AAO pores structures with shaped geometries and complex architectures (see figure). By applying periodic oscillatory current signals with different profiles, amplitudes, and periods, to combine mild and hard anodization,…
The recently discovered giant magnetic anisotropy of single magnetic Co atoms raises the hope of magnetic storage in small clusters. We present a joint experimental and theoretical study of the magnetic anisotropy and the spin dynamics of Fe and Co atoms, dimers, and trimers on Pt(111). Giant anisotropies of individua…
Time-dependent speckle pattern of paraelectric barium titanate observed in a soft x-ray laser pump-probe measurement is theoretically investigated as a correlated optical response to the pump and probe pulses. The scattering probability is calculated based on a model with coupled soft x-ray photon and ferroelectric ph…
We measure magnetotransport of F-doped SmFeAsO samples up to 28 T and we extract the upper critical fields, using different criteria. In order to circumvent the problem of criterion-dependent ${H}_{c2}$ values, we suggest a thermodynamic estimation of the upper critical field slope $d{H}_{c2}/dT$ based on the analysis…
Abstract Poly( L ‐lactide) (PLA) was melt‐blended with four rubber components—ethylene–propylene copolymer, ethylene–acrylic rubber, acrylonitrile–butadiene rubber (NBR), and isoprene rubber (IR)—in an effort to toughen PLA. All the blend samples exhibited distinct phase separation. Amorphous PLA constituted a topolog…
Lavender layers: A poly(p-phenylene) anionic derivate and exfoliated Mg-Al layered double hydroxide monolayers were assembled into ultrathin films with well-defined blue fluorescence (see picture; the numbers indicate the number of bilayers), long-range order, and high photostability. These films work as multiple quan…