Materials Literature
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Superconductivity arises in the layered iron-pnictide compounds when magnetic long range order disappears. We use first principles density functional methods to study magnetic arrangements that may compete with long range order near the phase boundary. Specifically, we study the energetics and charge density distribut…
The use of inelastic x-ray scattering (IXS) to investigate phonons and phonon dispersion in crystals opens the field of phonon spectroscopy, allowing measurements on tiny samples: micrograms of material, or single crystals ~10 to 100 micron diameter are sufficient. Here we review the technique as it is practiced at BL…
We study coherent electron dynamics in a biassed undriven ideal semiconductor superlattice coupled to the continuum, near energy level anticrossings. In particular, we examine the dependence of wavepacket dynamical characteristics on electric field detuning, and investigate mixed regimes involving a superposition of e…
We demonstrate a simple and reproducible way to produce quasi-spherical Au nanoparticles (NPs) with a fairly narrow size distribution in water by rapidly adding a mixture solution of HAuCl(4), sodium citrate, and a trace amount of silver nitrate into boiling water. The sizes of quasi-spherical Au NPs obtained increase…
Molecular dynamics simulations, used in conjunction with a set of Born model potentials, have been employed to study oxygen transport in tetragonal La2NiO4+δ. We predict an interstitialcy mechanism with an activation energy of migration of 0.51 eV in the temperature range 800–1100 K. The simulations are consistent wit…
Light work: Studies into the mechanism of AAQ, a photoswitchable blocker of voltage-gated K+ channels, led to the discovery and development of photochromic ligands that act at the internal tetraethylammonium binding site (see picture). These molecules can be applied from the extracellular side to impart long-lasting p…
Silver nanoparticles (Ag NPs) may present a risk to the environment due to their expected toxicity and wide exposure. The interactions between Ag NPs and laboratory-grown Pseudomonas putida biofilms were investigated under a range of environmentally relevant conditions (pH 6 and 7.5; presence and absence of Suwannee R…
peer reviewed
The catalytic activity of Au-embedded graphene is investigated by the first-principle method using the CO oxidation as a benchmark probe. The first step of CO oxidation catalyzed by the Au-embedded graphene is most likely to proceed with the Langmuir−Hinshelwood reaction (CO + O 2 → OOCO → CO 2 +O), and the energy bar…
ADVERTISEMENT RETURN TO ISSUEPREVReviewDendron-Mediated Self-Assembly, Disassembly, and Self-Organization of Complex SystemsBrad M. Rosen, Christopher J. Wilson, Daniela A. Wilson, Mihai Peterca, Mohammad R. Imam, and Virgil Percec*View Author Information Roy & Diana Vagelos Laboratories, Department of Chemistry, Univ…
A three-dimensional finite element model for phase change random access memory (PCRAM) is established for comprehensive electrical and thermal analysis during SET operation. The SET behaviours of the heater addition structure (HS) and the ring-type contact in bottom electrode (RIB) structure are compared with each oth…
In 1948, De Beers launched an advertising campaign headed by the slogan ”Adiamond is forever,” convincing the American public that diamonds are synonymous with romance, glamour, and prestige. Since then, diamonds have been desirable as symbols of social and economic success. The expensive price tag, associated with to…
The rapid dendritic growth of primary Ni 3 Sn phase in undercooled Ni-30.9%Sn-5%Ge alloy is investigated by using the glass fluxing technique. The dendritic growth velocity of Ni 3 Sn compound is measured as a function of undercooling, and a velocity of 2.47 m/s is achieved at the maximum undercooling of 251 K (0.17T…
The high-temperature Raman spectroscopy technique is applied to investigate the phase transition of LiB 3 O 5 crystal. The result shows that the crystal is stable in the range of 293–893 K. When the temperature increases up to above 1107K, the phase transition occurs. In the liquid phase, Li 2 B 4 O 7 crystal precipit…
Fe-doped In2O3 films are grown epitaxially on YSZ (100) substrates by pulsed laser deposition. The in-situ reflection high-energy electron diffraction, the atomic force microscopy, and the x-ray diffraction patterns show that the films have a well defined cubic structure epitaxially oriented in the (100) direction. Ro…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Glow discharges of oxygen and nitrogen were applied to low density polyethylene thin films in order to study accelerated oxidation and nitridation in the polymer. The studies were focused on the morphologic, crystalline and hydrophilic evolution promoted by plasma exposure. The particular chemical characteristics of t…
Carbon nanotube (CNT) emitters were formed on line-patterned cathodes in microtrenches through a thermal CVD process. Single-walled carbon nanotubes (SWCNTs) self-organized along the trench lines with a submicron inter-CNT spacing. Excellent field emission (FE) properties were obtained: current densities at the anode…
Magnetic composites of carbon nanotubes (CNTs) are synthesized by the in situ catalytic decomposition of benzene at temperatures as low as 400°C over Fe nanoparticles (mean grain size = 26 nm) produced by sol-gel fabrication and hydrogen reduction. The yield of CNT composite is up to about 3025% in a run of 6 h. FESEM…
Dielectric tunable composite ceramics Ba 0.6 Sr 0.4 TiO 3 -Mg 2 TiO 4 (BST-MT) are prepared with a heterogeneous nucleation sol-gel approach. The Mg 2 TiO 4 powders are synthesized by the conventional solid-state reaction method. The micro-sized MT powders with dispersant Ciba-4010 are introduced into Ba-Sr-Ti sol to…