Materials Literature
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The development of reference materials for toxicology and metrology is a critical component in establishing testing strategies and methods for human health hazard assessment of nanoparticles. A UK-based project (REFNANO) employed a workshop-based process to identify a priority list of candidate reference materials to…
The electronic structures of SrCu2O2 and PbCu2O2 have been studied by density functional theory calculations in conjunction with high resolution X-ray photoemission spectroscopy (XPS) and electron paramagnetic resonance spectroscopy (EPR). In both materials there is linear O–Cu–O coordination and a band of Cu 3d state…
The synthesis and characterization of bent-core liquid crystals which incorporate TTF groups is reported; different bent-core mesophases are induced depending on the molecular structure and properties derived from their compact packing have been studied.
We study the wetting behavior of water droplets on superhydrophobic arrays of lithographically fabricated square posts. To determine the droplet wetting state, we measure static contact angles and compare the results to predictions for equilibrium Cassie and Wenzel states. Surprisingly, we find that roll-off angles ar…
Vertically aligned ZnO nanowires with controllable density were successfully synthesized by nanoparticle-assisted pulsed-laser deposition (NAPLD), by which nanoparticles formed in the gas phase by the condensation of the ablated species are transported onto the substrate, and nanoparticles play an important role in de…
The present work studies the effects of the diameter of carbon nanotube (CNT) as well as CNT weight fraction on the uniaxial stress‐strain behavior, stiffness, and strength of CNT‐reinforced epoxy‐matrix composites. The experimental results show that average Young′s moduli of 5 wt%‐CNT/epoxy composites with a CNT diam…
We report the fabrication of novel hollow particles, with a hole engineered in the shell, via a coacervation technique. These particles are termed colloidal buckets. Two sets of conditions were explored: (i) lowering the operating temperature to reduce the solvent evaporation rate, and (ii) incorporation of a third co…
Modeling of corrosion pit chemistry in applied polarization mode is carried out using finite element method calculations. The results lead to the formulation of critical conditions for pit stabilization in terms of the pit geometry and the applied potential. More detailed computing is performed to compare the behavior…
By using solid state reaction method we have fabricated the hole doped $La_{1-x}Sr_xFeAsO$ superconductors with Sr content up to 0.13. It is found that the sharp anomaly at about 150 K and the low temperature upturn of resistivity are suppressed by doping holes into the parent phase. Interestingly both the superconduc…
Fabrication of display products by low cost printing technologies such as ink jet, gravure offset lithography and flexography requires solution processable semiconductors for the backplane electronics. The products will typically be of lower performance than polysilicon transistors, but comparable to amorphous silicon…
In this study, we fabricated an anode-supported microtubular solid oxide fuel cell (SOFC) with the cell configuration (LSCF)– (CGO) cathode/CGO buffer layer/ (ScSZ) electrolyte/Ni–ScSZ anode. A power generation test of the SOFC was carried out at 0.1–0.7 MPa at . By using a wet gas mixture and air, the maximum power d…
We have investigated transparent conducting properties of using In-doped (4 at. %) zinc oxide (IZO) thin films deposited on glass substrate by pulsed DC magnetron sputtering at low processing substrate temperatures. As increase of the substrate temperature, IZO thin films with better c -axis orientations were grown in…
Using ab initio molecular dynamics simulations we demonstrate that surfaces of stoichiometric silica exhibiting non-bridging oxygen defects can be surprisingly resistant to attack by water.
Glass ceramic phosphors containing fresnoite (Ba2TiSi2O8) were prepared from glasses both within and outside the immiscibility region of the BaO-TiO2-SiO2 system by conventional melt-quenching and subsequent heat treatment. The phosphors showed blue-white photoluminescence (PL) under ultraviolet excitation, and the ef…
We have performed a femtosecond pump-probe and nanosecond flash-photolysis measurements on a new type of photochromic molecules. These photochromes incorporate an indolo[2,1-b][1,3]benzoxazine ring system which opens upon UV light excitation and closes back within a few tens of ns. The details of ring opening and spec…
Hypoeutectic cast irons containing 16 mass% and 26 mass% Cr with single additions of Ni, Cu, Mo and V as well as without alloy addition were prepared to investigate variations of micro-hardness of matrix during heat treatment. In the as-hardened state, Ni and Cu decreased the micro-hardness but Mo increased it slightl…
We present an experimental study of the photosensitive properties of a narrow bandpass filter based on a Ge(15)Sb(20)S(65) spacer fabricated by electron beam deposition. For a single layer, near the optical bandgap of this chalcogenide material, the efficiency of the photo-bleaching increases as the central wavelength…
A first-principles density functional theory study of the recently reported IrN2 and OsN2 as well as the as yet not synthesized RhN2 transition metal nitrides is presented. It is found that although IrN2 has a slight preference for the arsenopyrite structure, OsN2 prefers the marcasite structure and RhN2 has no clear…
Electrocrystallization of iodinated TTF molecules in presence of trinuclear [Mo3S7Cl6]2−cluster anions provides the first example of radical salts with halogen bonding interactions at the organic/inorganic interface.
The structure and morphology of thin In 2 O 3 films deposited on NaCl(001) single-crystal cleavage faces and thin sapphire sheets has been studied by transmission electron microscopy techniques and scanning electron microscopy. Both the substrate temperature and the nature of the substrate proved to be crucial for the…