Materials Literature
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The oxidation reaction of piranha solutions with purified HiPco carbon nanotubes was measured as a function of temperature. At high temperatures, piranha is capable of attacking existing damage sites, generating vacancies in the graphene sidewall, and consuming the oxidized vacancies to yield short, cut nanotubes. Inc…
There has been substantial renewed interest in negative thermal expansion following the discovery that cubic ZrW 2 O 8 contracts over a temperature range in excess of 1000 K. Substances of many different kinds show negative thermal expansion, especially at low temperatures. In this article we review the underlying the…
This work reports on the capability of the O2-activated Cu-ZSM-5 and Cu-MOR zeolites to selectively convert methane into methanol at a temperature of 398 K. A strong correlation between (i) the activity and (ii) the intensity of the 22 700 cm-1 UV-vis band, assigned to the bis(mu-oxo)dicopper core, is found (i) as a f…
Antireflection coatings (ARC) have been modeled and prepared experimentally for optical and electro-optical applications in the visible spectrum (0.4--0.7 m m) to reduce reflections from the surface of glass. Reflection of BK7 bare glass substrate varies from 3.5 to 6.0% over the desired spectrum. This value is reduce…
We propose a new mechanism leading to the ground state splitting for the ${\mathrm{Mn}}^{2+}$ ion in PbMnTe crystals. The splitting is due to two effects, one of which is the hybridization of $3d$ electrons with the band states and the other is the internal spin orbit interaction in ${\mathrm{Mn}}^{1+}$ and ${\mathrm{…
Two kinds of Ti-rich TiNi shape memory thin films were deposited onto monocrystal silicon substrates at room temperature and high temperature by using the magnetron-sputtering technique. Their crystallizing procedures are different from each other. The first type of film was originally amorphous and post-crystallized…
The use of dedicated PET scanners is becoming more widespread throughout Australia and the world. PET imaging utilizes short-lived (approximately 108 min), high-energy (511 keV) gamma-ray emitters that could result in a high radiation dose being received by staff. As part of a larger staff and area monitoring project,…
Effects of chain ends on the dynamics of atactic poly(methyl methacrylate) (PMMA) was studied by the spin-label technique. PMMA's with well-defined molecular weights were synthesized by atom transfer radical polymerization and selectively labeled at the end or inside sites of the chain with a stable nitroxide radical.…
The dielectric tuning and loss of (Ba,Sr)TiO3:MgO bulk composites depend strongly on the connectivity and interaction among the two phases. To investigate this relationship, the polar structure and dynamics of these composites are mapped as a function of space and time using a pair of three-dimensional probes: second-…
A type of large paramagnetic persistent current is revealed in polygonal carbon nanotube (CNT) tori through calculation of the persistent current-induced magnetic moment using a tight binding model. Polygonal CNT tori, constructed by apices formed at heptagonal and pentagonal defects on the inner and outer fringes, ex…
Abstract Summary: High molecular weight (HMW) poly(vinyl acetate)/silver nanocomposite microspheres (PVAc/Ag), which are promising precursors of embolic materials with radiopacity, were prepared via a suspension polymerization approach in the presence of silver nanoparticles. It was found that a high yield and high mo…
Author name used in this publication: F. G. Shin
The relaxation processes for photoexcited electrons in single-wall carbon nanotubes (SWNTs) are discussed in connection with recent photoluminescence excitation (PLE) spectroscopy experiments. The electron-phonon $(e\text{\ensuremath{-}}\mathrm{ph})$ interaction of SWNTs is calculated for each phonon mode as a functio…
The nuclear magnetic resonance (NMR) spectra of a decagonal ${\mathrm{Al}}_{72.6}{\mathrm{Ni}}_{10.5}{\mathrm{Co}}_{16.9}$ single-grain quasicrystal (QC) were investigated by field- and frequency-sweep techniques in two magnetic fields and the $^{27}\mathrm{Al}$ relaxation rate was determined. The spectra are strongly…
Dielectric nonlinearity is an important characteristic of ferroelectrics. Based on the characteristics of hysteresis loops and ε-E curves in ferroelectric materials, a model for dielectric nonlinearity of ferroelectrics is established. It is verified by the data of barium strontium titanate thin films.
Coupling drives the rotation: A theoretical study of proton-transfer dynamics of 5-methyltropolone (5MTR) has identified a long-range mechanical interaction. Methyl group rotation can be driven by proton transfer because of coupling between hyperconjugation and tautomerization within 5MTR (see HOMO–LUMO interaction).…
Besides inflammation, specific immune responses are seen also after implantation of biomaterials. The aim was to investigate the humoral response to bovine collagen type I following implantation of various polyester (Dacron) prostheses into pigs. In 24 randomized pigs, the infrarenal aorta was replaced with a segment…
We have investigated the effect of film thickness on the distribution of Mn atoms at various lattice sites in Ga1−xMnxAs thin films. We find that the growth surface acts as a sink facilitating the outdiffusion of Mn interstitials (MnI), and thus reducing its concentration in the film. The outdiffused MnI accumulate on…
Structural characteristics of CeO(2)-ZrO(2)/TiO(2) (CZ/T) and V(2)O(5)/CeO(2)-ZrO(2)/TiO(2) (V/CZ/T) mixed oxide catalysts have been investigated using X-ray diffraction (XRD), BET surface area, Raman spectroscopy (RS), and high-resolution transmission electron microscopy (HREM) techniques. The CeO(2)-ZrO(2) (1:1 mole…
The electronic structures of the molecule ${\mathrm{C}}_{50}{\mathrm{Cl}}_{10}$ are studied in the framework of density functional theory (DFT) with the Perdew-Burke-Ernzerhof (PBE) functional. The static polarizability $\ensuremath{\alpha}$ and second-order hyperpolarizability $\ensuremath{\gamma}$ are calculated by…