Materials Literature
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The diffusive-ballistic heat conduction of finite-length single-walled carbon nanotubes has been studied by means of nonequilibrium molecular dynamics simulations. The length dependence of thermal conductivity is quantified for a range of nanotube lengths up to 1.6 µm at room temperature. A gradual transition from nea…
A simple method for controlling the spatial distribution of nanoparticles in a diblock copolymer is shown. By varying the ligand functionality of the nanoparticles, as well as the processing conditions, the distribution of gold nanoparticles in the microdomains of the diblock copolymer was controlled and altered. In a…
We report the growth of ZnO nanowires on nonwoven polyethylene fibers using a simple hydrothermal method at a temperature below the boiling point of water. The ZnO nanowires were grown from seed ZnO nanoparticles affixed onto the fibers. The seed ZnO nanoparticles, with diameters of about 6-7 nm, were synthesized in i…
Kinetics of iron carbonate layer formation in carbon dioxide corrosion has been investigated using a direct method—the corrosion layer weight-change method. The experiments were conducted in a glass cell at the temperatures from 60°C to 90°C, within an iron carbonate supersaturation range from 10 to 350. It was found…
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We investigate the properties of nanotubes obtained from recently described boron alpha-sheet, using density functional theory. Computations confirm their high stability and identify mechanical stiffness parameters. This allows one to further analyze the basic vibrations, including the radial breathing mode Raman freq…
Fully epitaxial magnetic tunnel junctions (MTJs) were fabricated with full-Heusler alloy Co2MnSi thin films as both lower and upper electrodes and with a MgO tunnel barrier. The fabricated MTJs showed clear exchange-biased tunnel magnetoresistance (TMR) characteristics with high TMR ratios of 179% at room temperature…
Intrinsic Josephson-junction stacks realized in high-temperature superconductors provide a very attractive base for developing coherent sources of electromagnetic radiation in the terahertz frequency range. A promising way to synchronize phase oscillations in all the junctions is to excite an internal cavity resonance…
The authors developed a preparation technique of Co2FeSi full-Heusler alloy thin films with the L21-ordered structure on silicon-on-insulator (SOI) substrates, employing rapid thermal annealing (RTA). The Co2FeSi full-Heusler alloy films were successfully formed by RTA-induced silicidation reaction between an ultrathi…
We report a direct observation of dramatic mass transport due to 1.5 MeV Au2+ ion impact on isolated Au nanostructures of an average size 7.6 nm and a height 6.9 nm that are deposited on Si (111) substrate under high flux (3.2x10^10 to 6.3x10^12 ions cm-2 s-1) conditions. The mass transport from nanostructures found t…
We present a detailed investigation of the magnetic and magnetotransport properties of thin films of ferromagnetic Ga1−xMnxAs synthesized using ion implantation and pulsed-laser melting (II-PLM). The field and temperature-dependent magnetization, magnetic anisotropy, temperature-dependent resistivity, magnetoresistanc…
We investigate the influence of impurities and vacancies in the formation of magnetic moment in CaB6 using full potential ab initio band structure calculations. CaB6 is found to be a band insulator with a band gap of about 0.2 eV. The calculated results indicate that carbon and oxygen substitution in boron sublattice,…
High-resolution synchrotron x-ray diffraction measurements were performed on single crystalline and powder samples of $\mathrm{Bi}{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$. A linear temperature dependence of the unit cell volume was found between ${T}_{N}=38$ and $100\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, suggesting that a…
We give a detailed presentation of our recent scheme to include correlation effects in molecular transport calculations using the GW approximation within the non-equilibrium Keldysh formalism. We restrict the GW self-energy to the central region, and describe the leads by density functional theory (DFT). A minimal bas…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTRapid Directed Assembly of Block Copolymer Films at Elevated TemperaturesAdam M. Welander†, Huiman Kang†, Karl O. Stuen†, Harun H. Solak‡, Marcus Müller§, Juan J. de Pablo†, and Paul F. Nealey*†View Author Information Department of…
Nanoparticles of TiO2, ZrO2, AL2O3, CeO2, fullerene (C60), single-walled carbon nanotubes, and polymethylmethacrylate were tested for ecotoxic effects using one or more ecotoxicity endpoints: Microtox (bacteria), pulse-amplitude modulation (algae), Chydotox (crustaceans), and Biolog (soil enzymes). No appreciable effe…
Abstract The total specific surface area ( TSSA ) and smectitic layer charge ( Q s ) calculated from the structural formulae and unit-cell dimensions of 12 pure smectite samples were used as a reference in the design and evaluation of TSSA and Q s measurement techniques based on cation exchange capacity ( CEC ), H 2 O…
This paper provides an overview of the electric field (E-field) distribution on transmission line composite insulators applied in alternating current applications. Factors that affect the E-field distribution are discussed as well as the influence of the E-field distribution on the short and long term performance. Mod…
Organic-coated superparamagnetic iron oxide nanoparticles (OC-SPIONs) were synthesized and characterized by transmission electron microscopy and X-ray photoelectron spectroscopy. OC-SPIONs were transferred from organic media into water using poly(amidoamine) dendrimers modified with 6-TAMRA fluorescent dye and folic a…
Hall effects are investigated for three-dimensional Dirac electrons as a model of bismuth alloys. It is found that there is unconventional contributions to the Hall conductivity $σ_{xy}$ generated by the interband effects of a magnetic field. This phenomena is remarkable near the band-edge. The Hall coefficient exhibi…