Materials Literature
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A novel method is reported for the preparation of transparent polycrystalline yttria ceramics in oxygen atmosphere. Zirconia and other additives were added to control the grain growth. Pores can be eliminated clearly at a temperature <1650°C with the grain size around 1 μm. The grain growth kinetics and the mechani…
The spatial distribution of photocurrents generated in nanoscale devices comprising a contact between a graphene sheet and a cadmium sulfide nanowire is explored. The magnitude and spatial extent of the photocurrent can be improved through appropriate chemical modification of the graphene–CdS interface. Moreover, the…
The effect of electron-impurity and electron-electron interactions on the energy spectrum of electrons moving in graphene is investigated in the presence of a high magnetic field. We find that the width of the broadened Landau levels exhibits an approximate $1/B$ dependence near half filling for charged impurity scatt…
New blood vessel formation is a critical requirement for treating many vascular and ischemia related diseases, as well as for many tissue engineering applications. Angiogenesis and vasculogenesis, in fact, represent crucial processes for the functional regeneration of complex tissues through tissue engineering strateg…
Two-dimensional crystalline micro-tiles are prepared from a small organic hexaphenylsilole (HPS) compound by a self-assembly process. Characteristics of the single micro-tiles indicate that they can serve as active directional optical waveguides. When the excitation point is at one end of a micro-tile, waveguided ligh…
Starting with elemental chunks of bismuth, antimony, tellurium and selenium, densified bulk materials (Bi 0.95 Sb 0.05 ) 2 (Te 1− x Se x ) 3 ( x = 0.10, 0.13, 0.15 and 0.17) were prepared by melt spinning subsequently combined with a spark plasma sintering process. The prepared bulk materials display fine grain size a…
Via catalyst‐assisted pyrolysis, Si 3 N 4 and SiC nanowires were produced on the cell walls of polymer‐derived ceramic foams. The pyrolysis atmosphere and temperature were the main parameters affecting their development: silicon nitride single‐crystal nanowires formed under nitrogen, while silicon carbide ones were pr…
In this study, the impact strengths of E-glass, coir, oil palm as well as E-glass/coir and E-glass/oil palm hybrid polyester composites were studied. All types of composites were reinforced with fiber volume fractions of 30%, 40%, and 50% and fiber lengths 3, 7, and 10 mm. Composite laminates reinforced with longitudi…
A previously unreported anhydrous polymorph (Form IV) of theophylline has been crystallized and characterized. Solubility determination, crystallization, and equilibration experiments indicated that Form IV is the most thermodynamically stable anhydrous polymorph. The hydration behavior of theophylline was investigate…
The first crystal structure of a copper beta-octabromo-meso-triarylcorrole exhibits a uniquely saddled corrole macrocycle, where adjacent pyrrole rings are tilted relative to each other by 60-80 degrees. Such strong nonplanarity may be contrasted with the essentially planar macrocycle conformations observed in the vas…
Sticking together: The pore entrances of dye-loaded green or red zeolite L crystals can be site-specifically modified with either alkoxyamines or nitroxide radicals. Mild radical nitroxide exchange reactions of alkoxyamine-terminated “green” zeolite crystals with nitroxide-terminated “red” crystals leads to highly reg…
Block copolymer nanopaticles were prepared from the mixture solutions containing good/poor solvents by a simple evaporation process. The block copolymers formed disorder, unidirectionally stacked lamellar, and onion-like structures in nanoparticles depending on preparation temperatures. Thermal annealing induced the d…
Low-energy electron microscopy and microprobe diffraction are used to image and characterize corrugation in SiO(2)-supported and suspended exfoliated graphene at nanometer length scales. Diffraction line-shape analysis reveals quantitative differences in surface roughness on length scales below 20 nm which depend on f…
We show by molecular dynamics simulations that there exists a reversible domino process in single walled carbon nanotubes (SWCNTs). SWCNTs with one end collapsed and the other circular are chosen for demonstration. At a low temperature, the collapsed zone spreads over the whole tube, while at a higher temperature, the…
We investigate the functionalization of functional groups to graphene nanoribbons with zigzag and armchair edges using first-principles calculations. We find that the formation energy for the configuration of the functional groups functionalized to the zigzag edge is ~0.2 eV per functional group lower than that to the…
We report time-resolved Kerr effect measurements of magnetization dynamics in ferromagnetic SrRuO3. We observe that the demagnetization time slows substantially at temperatures within 15K of the Curie temperature, which is ~ 150K. We analyze the data with a phenomenological model that relates the demagnetization time…
Structural control, and especially chirality control, remains a significant challenge in the synthesis of single-walled carbon nanotubes (SWNTs). We report herein a rational approach to engineering fullerene caps for growing SWNTs with controlled structures via chemical vapor deposition (CVD). Opening of fullerendione…
We analyze both experimentally (where possible) and theoretically from first principles the dielectric tensor components and crystal structure of five classes of $Pbnm$ perovskites. All of these materials are believed to be stable on silicon and are therefore promising candidates for high-$\ensuremath{\kappa}$ dielect…
We present empirical potentials for dilute transition metal solutes in a-iron. It is in the Finnis-Sinclair form and is therefore suitable for billion atom molecular dynamics simulations. First principles calculation shows that there are clear trends across the transition metal series which enable us to relate the res…
Vertically aligned multiwall carbon nanotubes were grown by water-assisted chemical vapor deposition on a large-area lithium tantalate pyroelectric detector. The processing parameters are nominally identical to those by which others have achieved the "world's darkest substance" on a silicon substrate. The pyroelectric…