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。
Temperature dependent electron transport properties of individual ZnO mirco/nanowires from 293 K to 473 K were investigated by a four-probe method, and the size dependence of activation energy was studied. The conductivity increased with the increasing temperature, which was attributed to the thermal activations of do…
NiO/ZnO nanocomposites with NiO content of 4 at. % and 20 at. % were annealed up to 1200 °C to get Ni doped ZnO nanocrystals. Raman scattering spectra illustrate a broad and strong band at 500-600cm−1 in all nanocomposites after annealing above 700 °C, which suggests incorporation of Ni in the ZnO lattice. However, x-…
Phosphonic acids are effective chelating agents. They bind tightly to metal ions. Phosphonic acids have been widely used as corrosion inhibitors along with various metal ions such as Zn2+. The corrosion of various metals such as mild steel, copper, and aluminium have been prevented by phosphonic acids. Phosphonic acid…
Anisotropic properties of columnar nanoporous thin films were utilized to design and fabricate interference mirrors with lossless omnidirectional reflection in the visible spectral range. Index graded columnar films with distributed Bragg reflector (DBR), sinusoidal, and Gaussian refractive index profiles were studied…
We report on ultraviolet photovoltaic effects in a BiFeO3/Nb-doped SrTiO3 heterostructure prepared by a pulsed laser deposition method. The heterostructure exhibits rectifying behaviors in the temperature range from 80 K to 300 K. The photovoltage of heterostructure is about 0.33 V at T = 80 K when it is illuminated b…
Time resolved, in-situ, energy dispersive x-ray diffraction was performed in an electrolysis cell during electrochemical loading of palladium foil cathodes with hydrogen and deuterium. Concentrations of H:Pd (D:Pd) up to 1:1 in 0.1 M LiOH (LiOD) in H2O (D2O) electrolyte were obtained, as determined by both the Pd latt…
BACKGROUND: Dust accumulation on surfaces of critical instruments has been a major concern during lunar and Mars missions. Operation of instruments such as solar panels, chromatic calibration targets, as well as Extra Vehicular Activity (EVA) suits has been severely compromised in the past as a result of dust accumula…
Abstract A fracture mechanics analysis based on the J ‐integral method was adopted to determine the resistance of composites with various concentrations of wood‐flour and ethylene acrylate copolymer ( EAC ) to crack initiation ( J in ) and complete fracture ( J f ). The J in and J f energies of unmodified poly(lactic…
Enzyme-based smart materials constitute a rapidly growing group of functional materials. Often the natively evolved enzymes are not compatible with hydrophobic synthetic materials, thus significantly limiting the performance of enzymes. This work investigates the use of a polyethylene glycol (PEG)-conjugated detergent…
Using the transfer-matrix formalism, the resonance splitting effect of Dirac electrons through two types of magnetic superlattices in graphene is studied theoretically. The numerical results show that the transmission presents (n − 1)-fold resonance splitting for the both magnetic superlattices with n-barrier, similar…
A thermo-mechanical continuum model is proposed that is applicable to dynamically loaded glassy polymers. The underlying theory is based on an ansatz for the Helmholtz free energy where both the deviatoric and the volumetric terms in the free energy have non-equilibrium rate-dependent contributions. The requirement th…
Supported-NiO catalysts obtained with grinded and impregnated method were tested in the synthesis of carbon nanotubes by catalytic decomposition of methane at 650°C. Catalytic activity was characterized by the conversion levels of methane during the first 15 minutes of the reaction. Ni catalysts supported on Al2O3, Mg…
Dendritic polymers have shown great potential as drug carriers due to their precise chemical makeup, nanosized structures and high density of surface functionalities, but most dendrimers bear functionalities only on the periphery, limiting their utility as drug-delivery carriers. Herein, we report synthesis of biodegr…
Nanostructures of cupric oxide (CuO) obtained by ball milling show drastic changes in its magnetic behavior that cannot be only associated to a size effect. While sample of average size D = 29 nm presents a magnetic behavior that resembles that of bulk material with a Néel temperature of 195 K, another sample with D =…
Biopolymers composed of a pH-responsive, hydrophilic poly(methacrylic acid-grafted-ethylene glycol) network polymerized in the presence of poly(methyl methacrylate) nanoparticles were designed for the oral delivery of chemotherapeutics for the treatment of colon cancer. An inulin-doxorubicin conjugate, designed to tar…
Simple analytical expressions for the electron backscattering coefficient, η, are established from published data obtained in the ∼0.4-5 keV range for 21 elements ranging from Be to Au. They take into account the decline in η with a decrease in energy E° for high-Z elements and the reverse behavior for low-Z elements.…
Abstract We demonstrate synthesis of graphene using the solid precursor camphor in a microwave excited surface wave plasma chemical vapor deposition technique. Highly sublimely camphor was introduced into the plasma chamber in the vapor phase along with Ar and uniform plasma formation was obtained. Rapid deposition of…
Epitaxial Mn3O4/La0.7Sr0.3MnO3 (Mn3O4/LSMO) bilayer thin films were grown on lattice-matched single crystal substrates of SrTiO3 (STO) (100) and MgO (100), with Mn3O4 as the top layer, using a pulsed laser deposition technique. X-ray diffraction (XRD) patterns revealed the single crystalline nature and epitaxial relat…
This article reports the results of numerical study on the effect of high frequency ultrasounic waves on heat transfer rate. A cylindrical heater surrounded by water was exposed to a 1.7 MHz piezoelectric transducer, and its temperature was measured with and without employing the ultrasound vibrations. Heat transfer r…
Traditional tube-based x-ray sources are widely employed in medical imaging, security screening, and industrial inspection. The cone-beam produced by these tubes is simple to apply, but often demands a long stand-off distance to the object of interest. When combined with the bulk of tubes and their attendant power sup…