Materials Literature
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Temperature-dependent 1 H NMR and dilute solution viscometry coupled with dynamic light scattering techniques were used to elucidate the aqueous phase conformation of several poly(vinyl alcohol)s (PVAs) differing in their molecular architecture (i.e., degree of blockiness, molecular weight, and degree of hydrolysis).…
We developed a CVD system employing inductively coupled micronplasma generated by applying UHF (UHF microplasma). This system can be operated easily in air at atmospheric pressure with a few tens of watts of UHF power and enables us to deposit material on a wide variety of substrates. Deposition of carbon from CH 4 /A…
PMMA/Pd nanocomposites were prepared by means of free radical polymerization of methyl methacrylate using AIBN initiator in the presence of palladium acetate at 50 °C (48 h), and subsequent thermal conversion of palladium acetate into palladium metal at 120 °C (1 h). Morphological, thermomechanical, and thermal proper…
A polyelectrolyte architecture was fabricated that was composed of chitosan and organophosphorus hydrolase polycations along with thioglycolic acid-capped CdSe quantum dots (QDs) as the polyanion. This film was imaged by epifluorescence microscopy. UV−vis and emission spectroscopies were used to monitor the growth of…
Abstract The first part of this investigation focused on the synthesis and characterization of a new type of intumescent flame‐retardant (IFR) agent. Four steps were used in the synthesis process. The structure was characterized by FTIR, magic‐angle spinning nuclear magnetic resonance (MAS‐NMR) 13 C spectroscopy, and…
PURPOSE: The purpose of this study was to compare contrast enhanced MR angiography (MRA) with gadopentetate dimeglumine (Gd-DTPA) to MRA with gadobenate dimeglumine (Gd-BOPTA), a high relaxivity paramagnetic contrast agent. MATERIALS AND METHODS: Twelve patients referred for carotid artery stenosis were examined with…
Abstract In this research, a flame‐retardant water‐dispersed polyurethane resin was synthesized through incorporating phosphonate groups into the polyurethane structure in the chain‐extension step. A phosphorus‐containing reactive flame‐retardant compound was synthesized for this purpose. First, bis(4‐nitrophenyl)phen…
In contrast to the conventional photoorientation process with blue light, an orientation of 4-cyano-4‘-alkoxyazobenzene side groups parallel to the electric field vector of the incident light is generated upon irradiating films of a liquid-crystalline side-chain polymer with linearly polarized red light. The polyester…
The chemisorption of atomic hydrogen on the single-walled armchair and zigzag carbon nanotubes is studied with ab initio calculations. The binding energy of H adsorption at the exterior of the nanotubes is much greater than that at the interior. We predict that two rows of H atoms chemisorbed on selective sites exteri…
Abstract Fly ash, a waste productof thermal power stations generated in huge quantities, has been posing problems of its disposal. As such it contains a variety of inorganic oxides and is available in finely powdered form. Attempts have been made for its use as a filler in elastomers and plastics. It is important to n…
Carrier-doping effects on the structural phase transitions in ${\mathrm{SrTiO}}_{3}$ are investigated by the first-principles calculations. It is found that the instabilities of the cubic phase to both the ${\mathrm{TiO}}_{6}$-octahedron rotated phase and the ferroelectric phase are modulated characteristically by the…
The novel conjugated polymer ( 12 ) which has [2.2]paracyclophane and ferrocene units in the polymer backbone was synthesized by palladium-catalyzed polycondensation of the monomer ( 10 ) with diiodoferrocene ( 11 ). The obtained polymer ( 12 ) was soluble in common organic solvents, and the structure of 12 was confir…
The room temperature photoluminescence property of ZnO particles embedded in sol–gel silica was investigated. Three ZnO emissions at about 3.25 eV (ultraviolet (UV)), 2.8 eV (blue), and 2.45 eV (green) were observed. The blue and green emissions were ascribed to interstitial zinc and oxygen vacancy defects in ZnO. At…
High-pressure micro-discharges are promising sources of light, ions, and radicals and offer some advantages in materials processing applications as compared to other more conventional discharges. We review here results from etching experiments using stencil masks where the discharge is formed only in the pattern cutou…
Physicochemical, binding, and antibacterial properties of chitosans prepared without and with deproteinization (DP) process (5, 10, 15, and 30 min at 15 psi/121 degrees C) were compared. Chitosan from DP 0 min had comparable nitrogen content, lower degree of deacetylation and solubility, but higher molecular weight an…
The thermal stability and folding kinetics of a 15-residue beta-hairpin (SESYINPDGTWTVTE) have been studied by using infrared (IR) spectroscopy coupled with laser-induced temperature-jump (T-jump) technique for rapid folding-unfolding initiation. An alternative method based on analyzing IR difference spectra was also…
Abstract Poly(ethylene terephthalate) (PET)/silica nanocomposites were fabricated by direct polymerizing PET monomer dispersed with organic modified silica nanoparticles. The characteristics and properties of these nanocomposites were investigated by the transmission electron microscopy, differential scanning calorime…
Lattice effects in a cerium based clathrate compound ${\mathrm{Ce}}_{3}{\mathrm{Pd}}_{20}{\mathrm{Ge}}_{6}$ with a cubic ${\mathrm{Cr}}_{23}{\mathrm{C}}_{6}$-type structure have been investigated by ultrasonic and thermal expansion measurements. Elastic softenings of ${(C}_{11}\ensuremath{-}{C}_{12})/2$ and ${C}_{44}$…
Three-dimensional porphyrin-monolayer-protected gold clusters with different chain lengths (MPCs) have been prepared to examine the structure and photophysical properties, in comparison with self-assembled monolayers (SAMs) of the porphyrins on a flat gold surface. The three-dimensional porphyrin MPCs exhibit electroc…
Microplasma devices fabricated in silicon, ceramic, and metal/polymer structures: arrays, emitters and photodetectors, J G Eden, S-J Park, N P Ostrom, S T McCain, C J Wagner, B A Vojak, J Chen, C Liu, P von Allmen, F Zenhausern, D J Sadler, C Jensen, D L Wilcox, J J Ewing