Materials Literature
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The effect of graphite addition on the high‐energy ball‐milling behavior of zirconium diboride (ZrB 2 ) powder is investigated. It is shown that, regardless of presence or absence of graphite during ball milling, comminution occurs by repeated brittle fracture followed by cold‐welding, thereby resulting in the formati…
We present ab initio calculations of the band structure of graphene and of short zigzag graphene nanoribbons (ZGNRs) by the screened-exchange-local-density approximation (LDA) method within the framework of density functional theory. The inclusion of nonlocal electron-electron interactions in this approach results in…
The morphology of the precipitated silica VN3 filled in styrene butadiene rubber was studied as a function of the volume fraction Φ by means of small-angle X-ray scattering experiments. The wide q-range of 0.008 nm(-1)<q<1 nm(-1) probes the structures of the primary particles, the clusters, and resolves a part of the…
The crystallographic structures of decagonal quasicrystals and their periodic approximants are traditionally described as a periodic stacking of atomic planes. By performing a $^{27}\text{A}\text{l}$ NMR spectroscopic study of the ${\text{Al}}_{13}{M}_{4}$ ($M=\text{transition}$ metal) family of four-layer decagonal a…
This paper reports the effect of Er 2 O 3 concentration on nucleation and optical properties of PbS quantum dots (QDs) formed in a silicate glass under heat treatment at 490° or 500°C. As Er 2 O 3 concentration increased from 0.1 to 0.4 mol%, average radii of PbS QDs decreased from ∼5 to ∼4 nm, and peak wavelengths of…
Quantum dot-doped mesoporous microbeads (QDMMs) are encapsulated with silica shells for enhanced chemical stability. The results show that a micro-emulsion procedure is highly efficient in coating QDMMs with polyvinyl alcohol (PVA), which is important in the subsequent deposition of a silica shell. Incorporation of fl…
Using a laser monitoring technique, the solubility of ibuprofen in ethanol, 1-propanol, 1-butanol, 1-pentanol, 2-propanol, 2-methyl-1-propanol, 3-methyl-1-butanol, acetone, and ethyl acetate was determined in the temperature range from (283.15 to 318.15) K. The solubility data were correlated with a semiempirical equa…
The in‐plane creep–rupture behavior at 1315°C was measured in air for melt‐infiltrated SiC/SiC composite panels reinforced by Sylramic‐iBN SiC fibers with unbalanced three dimensional (3D)‐woven and 2D‐braided fiber architectures that displayed a high stress for the onset of through‐thickness matrix cracking at room t…
Organocomplexes with trivalent erbium are investigated by time-resolved optical spectroscopy techniques. Ultrafast time scales are reported for intraligand intersystem crossing (∼10 ps) and ligand-to-metal resonance energy transfer (∼100 ps), resulting in lanthanide-ion sensitization with nearly unity efficiency. Give…
We report our studies on the crystal structures, morphologies, and superconductivity in CeO 1 − x F x FeAs compounds which were fabricated by solid state reaction. The crystal structures were refined using Rietveld refinement. Superconducting properties such as critical temperature ( T c ), critical current density (…
A melt-infiltrated (MI) woven ceramic matrix composite consisting of a silicon carbide matrix reinforced by boron nitride coated Hi-Nicalon type S TM SiC fiber, Hi-Nic-S/BN/SiC, was tested under tension-tension fatigue loading in combination with combustion conditions representative of those experienced by hot-section…
We study in detail the optoelectronic properties of graphene. Considering the electron interactions with photons and phonons, we employ the mass- and energy-balance equations to self-consistently evaluate the photoinduced carrier densities, the optical conductance, and the transmission coefficient in the presence of a…
The extraordinary sulfur enhanced CO adsorption on Au surface creates curiosity to many scientists in the field, and is expected to have potential applications in catalyst design. In this work, we have investigated the interactions of the coadsorption of CO and various adatoms X (X=Na, S, O, and Cl) on Au and Pd(111)…
Eu‐doped oxyfluoride aluminosilicate glasses were prepared by melt‐quenching method. The glass samples were characterized by photoluminescence (PL) spectroscopy and electron paramagnetic resonance techniques. In the glass samples, the reduction of Eu 3+ to Eu 2+ ions occurred in the air condition. The PL spectra showe…
Hierarchically ordered comb block copolymer (CBCP) stripes are produced by combining top-down, controlled evaporative self-assembly of capillary-held CBCP solution. In the wedge-on-Si geometry, bottom-up, spontaneous self-assembly of CBCP nanodomains is promoted by subsequent solvent vapor annealing.
The synthesis, crystal structure, and electronic properties of perfluoro-isopropyl-substituted perfluorophthalocyanine bearing a copper atom in the central cavity (F(64)PcCu) are reported. While most halogenated phthalocyanines do not exhibit long-term order sufficient to form large single crystals, this is not the ca…
High Resolution Image Download MS PowerPoint Slide We present aerosol-derived alloy powders as a uniquely useful platform for studying the contribution of the metal phase to multifunctional supported catalysts. Multimetallic heterogeneous catalysts made by traditional methods are usually nonhomogenous while UHV-based…
Abstract Growth of anisotropic metal nanostructures with well‐defined shapes on large‐area semiconductor substrates represents a challenge to synthesize hybrid materials with complex functionalities. This Feature Article highlights the approach recently developed in our group for growing nanoplates made of noble metal…
Nonlocal response of the surface to the incident light is included into an ab initio one-step photoemission theory. Surface-state normal emission spectra from Be(0001) and Al(100) are calculated by a full-potential scattering method and are found to agree well with the experiment in a wide energy range. The total exci…
Well-defined poly(N-isopropylacrylamide)s (PNIPAMs) with boron dipyrromethene (BODIPY) in the terminal end were prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization of NIPAM with BODIPY-chain transfer agent (CTA), which was synthesized by the reaction of pyrrole and BODIPY derivative havi…