Materials Literature
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Phonon modes found in low-frequency Raman scattering from CdS1−xSex nanocrystals embedded in a borosilicate glass arising from confined acoustic phonons are investigated. In addition to the breathing and quadrupolar modes, two additional modes are found in the spectra. In order to assign the new modes, confined acoust…
The structural and magnetic characteristics were studied for martensitic and austenitic Ni–Mn–Ga melt-spun ribbons of as quenched and as annealed at different temperatures. No essential structure change was found before and after annealing, but there are some anomalies in the magnetization process. In the austenite st…
Hexagonal shaped radial and quasialigned arrays of ZnO nanorods with diameter of about 40–60 nm have been deposited on p-Si (100) substrates by vapor-solid method using Zn as the source material. x-ray diffraction, field emission scanning electron microscopy, temperature dependent-photoluminescence, and impedance spec…
The volatile compounds emitted from poly(butylene terephthalate) (PBT) during thermo-oxidative degradation at different temperatures were studied. The experiments were carried out in a flow tubular furnace at the temperatures of 200, 300, 400, 500, 600 and 700°C in an air atmosphere. The weight losses of PBT at differ…
Blending is a widely used technique for improving the mechanical, rheological, and degradative properties of various polymeric materials. It offers the opportunity to formulate a material with more desirable characteristics than either of the individual components. From industrial perspectives, polymer blends with con…
Diffraction anomalous fine structure is a recently developed technique which can provide a measurement of the local structure of a given element in a particular phase or crystallographic site. Most previous investigations have applied the technique to bulk solids, thin films, and nano-dots or wires on crystalline subs…
Interest in carbon-based electronics has been stimulated in recent years, initially through the discovery of carbon nanotubes, but recently with the formation of graphene layers. In this paper metal-oxide-semiconductor (MOS) systems based on these carbon structures are used to model and compare charge transport within…
Here we report on an unconventional Ni–P alloy-catalyzed, high-throughput, highly reproducible chemical vapor deposition of ultralong carbon microcoils using acetylene precursor in the temperature range 700–750 °C. Scanning electron microscopy analysis reveals that the carbon microcoils have a unique double-helix stru…
In this work we used quantum mechanical calculations, molecular dynamics simulations, and QM/MM methods to examine the formation of a pi-stacking ladder and the existence of charge transfer processes in a tubular nanostructure constructed using protein building blocks. Initially, the conformational properties of beta-…
Using the nonequilibrium Green’s function theory, transport properties of nanoscale graphene structures deposited on a SiO2/Si substrate have been investigated taking into account the influence of both lattice defects and charged impurities. The calculation argues the metallic lead-graphene coupling responsible for th…
A new dinuclear complex, [Ni(2)(H(2)O)L(4)].5H(2)O, consisting of chelating bidentate and bridging tridentate coordinated 2-[(4-methylphenylimino)methyl]-6-methoxyphenol (HL) Schiff base ligands and water molecules has been synthesized using a traditional method. The structure of this complex was characterized by FTIR…
The structures of self-trapped holes (STHs) in a disordered ${\text{SiO}}_{2}$ network are investigated using first-principles calculations. We consider two different kinds of STHs: STH1, consisting of a hole trapped on an oxygen atom bridging two silicon atoms, and STH2, a metastable structure, in which the hole is d…
We found strong site-selectivity of double cyclopropanations of the armchair (10,10) nanotube by a bismalonate with 2,3-butanediol tether. We compare this site selectivity with double cyclopropanations by CH 2 and with those of the C 60 fullerene. We employed density functional theory PW91 calculations based on a fini…
We report on the interpretation of thickness-dependent surface potential profiles in insulators on metal substrates measured by Kelvin probe method. The electrical potentials are calculated within a self-consistent model taking both the conductive substrate and the insulator into account. It is shown that interpreting…
The unique combination of physical properties inherent to graphite makes it an attractive material for use as a moderator in high-temperature nuclear reactors. High-temperature physical properties of three nuclear-grade graphites manufactured by GrafTech International Holdings Inc. (GrafTech, Parma, OH), PCEA™, PCIB-S…
In the catalysis of sugar hydrolysis by hen egg-white lysozyme, Asp52 is thought to stabilize the reaction intermediate. This residue is involved in the well-ordered hydrogen bonding network including Asn46, Asp48, Ser50 and Asn59 on the anti-parallel beta-sheet, designated as a 'platform', on which the substrate suga…
An air-passivated hafnium subhydride subcarbide nanopowder of the formula Hf3.47C1.00H2.40Li0.10O0.12 was prepared via a slurry sonochemical reaction of HfCl4 and LiH, followed by a 900 °C vacuum anneal. HRTEM of the nanopowder revealed crystallites of 10 nm average diameter that are agglomerated into larger porous st…
A metal sputtering source suitable for laboratory production of metal hydrides is described. Sputtering from pure nickel or iron in an Ar/H(2) discharge is analyzed at low resolution. High resolution laser excitation and dispersed fluorescence spectra of NiH have also been recorded. The source has been designed to ope…
We present a self-consistent field theory (SCFT) study of spherical micelle formation in a blend of poly(styrene−butadiene) diblocks and homopolystyrene. The micelle core radii, corona thicknesses, and critical micelle concentrations are calculated as functions of the polymer molecular weights and the composition of t…
The integration of suspended carbon nanotubes into micron-scale silicon-based devices offers many exciting advantages in the realm of nano-scale sensing and micro- and nano-electromechanical systems (MEMS and NEMS). To realize such devices, simple fabrication schemes are needed. Here we present a new method to integra…