Materials Literature
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The process of combinatorial materials development couples parallel production of large arrays of compositionally varying samples together with measurements of their properties. The diverse spectrum of functionalities in materials represents a significant challenge in high-throughput characterization, often involving…
Abstract Photoluminescence (PL) efficiency of CdTe nanocrystals was investigated as a function of the ratio of surfactant (thioglycolic acid, TGA) to Cd2+ used in aqueous preparation. When the ratio was 1.3, a maximum PL efficiency of 65% was obtained. Within our knowledge, this value is the highest ever reported for…
We demonstrate the feasibility of ultrahigh-density probe recording in chalcogenide-based phase change media. The multilayer medium has been optimized with respect to electrical, thermal, and tribological requirements. Design of the multilayer takes into account the nonlinear dependence of the electrical properties of…
Accurate ab initio methods for performing quantum mechanical calculations have been available for many years, but their speed, complexity and instability have generally constrained researchers to studying only a few systems at a time. However, advances in computer speed and ab initio algorithms have now created fast a…
Lightly phosphorus-doped {111} homoepitaxial diamond films have been grown by microwave plasma-assisted chemical vapor deposition under optimized growth conditions. The Phosphorus concentration in the film can be controlled at a low doping level of the order of 1016cm−3. N-type conductivity of the films with phosphoru…
The ability to precisely place nanomaterials at predetermined locations is necessary for realizing applications using these new materials. Using an organic template, we demonstrate directed growth of zinc oxide (ZnO) nanorods on silver films from aqueous solution. Spatial organization of ZnO nanorods in prescribed arb…
We present results of kinetic lattice Monte Carlo (KLMC) simulations of substitutional arsenic diffusion in silicon mediated by lattice vacancies. Large systems are considered, with 1000 dopant atoms and long range \textit{ab initio} interactions, to the 18th nearest lattice neighbor, and the diffusivity of each defec…
A detailed analysis of damping and noise due to a {\it sd}-interaction in a thin ferromagnetic film sandwiched between two large normal metal layers is carried out. The magnetization is shown to obey in general a non-local equation of motion which differs from the the Gilbert equation and is extended to the non-adiaba…
The palladium-catalyzed liquid-phase reaction of benzyl alcohol to benzaldehyde was investigated in the presence and absence of oxygen by attenuated total reflection infrared (ATR-IR) spectroscopy. The 5 wt % Pd/Al2O3 catalyst was fixed in a flow-through ATR-IR cell serving as a continuous-flow reactor. The reaction c…
Control over the synthesis of monodisperse silica particles up to mesoscopic scale is generally made difficult due to intrinsic limitation to submicrometric dimensions and secondary nucleation in seeded experiments. To investigate this issue and overcome these difficulties, we have implemented single step processing b…
After exposure to ionizing irradiation, mineral zircon exhibits thermoluminescence (TL), which can be used to calculate the irradiation dose and the age of natural samples. Different aspects of the dating procedure based on zircon TL, including laboratory added irradiation at room and elevated temperatures, fading and…
We propose a new procedure in biological cryocrystallography, using the laser-ablation technique. This is the first report on the successful processing of cryo-cooled crystals to create a “protein crystal ball” that is conducive to X-ray diffraction (XRD) data collection. Pulsed UV laser soft ablation (PULSA) modifies…
The effects of end-group balance and moisture level on melt-phase polycondensation reactions were investigated using nylon 612. The polycondensation reaction was determined to be first-order in amine ends and first-order in carboxyl ends at the relatively high temperature (284 °C) and low water concentration condition…
The chemical depth profile of the passive oxides formed on a stainless-steel surface (type 430, Fe–16.3%Cr) in pH 8.4 borate solution was obtained quantitatively by in situ anomalous x-ray reflectivity. The passive film consists of a Cr oxide inner layer and a Fe∕Cr oxide outer layer. The absence of Fe oxide underneat…
Recent experiments indicate that liquid crystals can be used to optically report the presence of biomolecules adsorbed at solid surfaces. In this work, numerical simulations are used to investigate the effects of biological molecules, modeled as spherical particles, on the structure and dynamics of nematic ordering. I…
1,4,8,11,15,18,22,25-Octahexyl-29H,31H-tetrabenzo[b,g,l,q][5,10,15]triazaporphyrin has been isolated as the main side product in the preparation of 1,4,8,11,15,18,22,25-octahexylphthalocyanine via a lithium pentyloxide induced cyclotetramerisation of 3,6-dihexylphthalonitrile.
A simple and versatile light-based strategy to grow low-dimensional gold superstructures is presented; prolonged UV-irradiation of TiO2 nanorod-stabilized Au nanoparticles in organic media promotes the progressive formation of distinctive chainlike metal assemblies, namely segments of a few gold particles, 2D or quasi…
Biphasic electrode systems allow electrochemical reactions to be driven in a microphase of organic liquid (typically 1-100 nL), which is coupled via ion transfer processes to the surrounding aqueous electrolyte medium. Microdroplet deposits on basal plane pyrolytic graphite as well as thin film deposits of the organic…
Time differential perturbed angular correlation measurements in ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{Mn}}_{0.995}{\mathrm{Hf}}_{0.005}{\mathrm{O}}_{3}$, using $^{181}\mathrm{Hf}$/Ta probe nuclei, reveal the presence of two distinct hyperfine components, identified with ${\mathrm{Mn}}^{4+}$ rich and deficien…
Abstract The hydrothermal reaction of VOSO 4 , As 2 O 5 , piperazine and H 2 O produces [H 2 N(CH 2 ) 4 NH 2 ] 4 [β‐As 8 V 14 O 42 (SO 4 )]·2HSO 4 ( 1 ), which is the first arsenic‐vanadium cluster containing a spherical β ‐As 8 V 14 O 42 shell. The structure of this compound was characterized by single crystal X‐ray…