Materials Literature
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The effect of selective inhibition of nanodiamond oxidation upon heating of detonation carbon in air is used to extract nanodiamonds from the detonation products. The methods for cleaning nanodiamonds from nondiamond carbon modifications are described depending on the synthesis conditions.
We report that the optical frame orientation is wavelength independent over the entire transmission range of the nonlinear monoclinic crystal Ca4YO(BO3)3 (YCOB). We used a new method based on internal conical refraction associated with x-ray diffraction on a single crystal cut as a sphere. Direct phase-matching-angle…
Ferroelectric polyamide 11 films were prepared by melt-quenching, cold-drawing and electrical poling. Their ferroelectricity was studied by means of dielectric-hysteresis measurements. A remnant polarisation of up to 35 mC/m/sup 2/ and a coercive field of 75 MV/m were obtained. The piezoelectric d/sub 33/ coefficient…
13C-NMR measurements have been carried out on the quasi two-dimensional organic conductor, α-(BEDT-TTF) 2 I 3 . We measured the angular dependence of 13 C-NMR spectrum at several temperatures above metal-insulator transition temperature, 135 K (=T MI, ). We found that charge (spin) disproportionation already exists in…
We report the preparation of metal-carbonyl-dendrimer-antibody conjugates. These metal-carbonyl-multilabeled antibodies are designed to be used in a new solid-phase-format carbonyl metallo immunoassay (CMIA). A fourth-generation polyamidoamine dendrimer was labeled with 10-25 (eta5-cyclopentadienyl)iron dicarbonyl (et…
Carbon black, silica and calcium carbonate were used as fillers in polypropylene–natural rubber–recycle rubber powder (PP–NR–RRP) composites. The effects of filler loading on processability, tensile properties, swelling behavior and morphology of PP–NR–RRP composites at a fixed weight ratio of 70/15/15 were studied. T…
The take-off run for aerospace composites has been prolonged, but now that designers feel more comfortable with these materials, they are incorporating them into primary aerostructures – as well as into the design codes, qualification loops and other features of the necessarily safety-first aviation culture. As a resu…
Structural, dielectric, ferroelectric and piezoelectric properties of lead magnesium niobate–lead titanate, PMN–PT (66:34), prepared at different sintering temperatures (1150–1250°C) are discussed for actuator applications. System sintered at 1200 and 1250°C showed better perovskite phase stabilization and higher valu…
A trimer of isophorone diisocyanate (IPDI) was prepared considering its industrial applications and safety associated with it was compared to normal diisocyanates. The IPDI trimer has been characterized by PMR and IR spectroscopies, physical constant (melting point) and isocyanate content. This trimer was used for pre…
The effects of low-energy electron irradiation on spin-coated films of regioregular poly(3-hexylthiophene) have been studied with fluorescence, mass spectrometry, and a variety of electron spectroscopies, including photoemission. Electron impact by 180 eV electrons causes a decrease in photoluminescence intensity, bro…
We have used a density-functional-based tight-binding method in order to create structural models of the canonical chalcogenide glass, amorphous ${\mathrm{As}}_{2}{\mathrm{S}}_{3}.$ The models range from one containing defects that are both chemical (homopolar bonds) and topological (valence-alternation pairs) in natu…
This study evaluates the effect of poly(L-lactic acid) (PLLA) and poly(hydroxybutyrate-cohydroxyvalerate) (PHBV) bioabsorbable polymers and their blends on the induction of alteration of cell growth pattern in vitro. Vero cells were cultured on PLLA, PHBV, and different blends (100/0, 60/40, 50/50, 40/60, and 0/100).…
A new and improved solution to the helicopter blade-tracking problem has been investigated. A discrete, blade-installed actuator utilizing shape memory alloy (SMA) torsion tubes has been developed to enable in-flight rotor tracking. SMA torsion tubes from three materials were tested and one was selected for its cyclic…
A high-pressure phase of TiO 2 with a baddeleyite-type related structure has been synthesized via very rapid heating-cooling under energetic Nd-YAG laser pulse irradiation of the Ti target in oxygen ambient. Spherical nanoparticles transformed martensitically into baddeleyite-type and then α-PbO 2 -type structures wit…
An incubation experiment lasting 111 d was carried out to study the effect of the addition of three clay minerals (Na-bentonite, Ca-bentonite, and zeolite) to soil derived from sewage sludge on water-extractable and exchangeable forms of four heavy metals (Zn, Cd, Cu, and Ni), as well as on soil organic matter mineral…
Within the “International Collaborative Programme on Organosilane Adhesion Promoters” (ICOSAP), scientists from the U.S. and Europe contributed to the understanding of an organosilane primer process, based on an aqueous solution of γ-glycidoxypropyl trimethoxysilane (γ-GPS), used currently for aerospace repair purpose…
Abstract Sugar cane bagasse fibers were modified by surface treatments using either physical or chemical methods in order to improve their adhesion to polystyrene matrices. The surface treatment methods used were alkaline treatment, treatment with silane coupling agents, physical coating with polystyrene and grafting…
A study has been conducted on the sintering of a ceramic ferrite having the composition (Cu 0.25 Ni 0.25 Zn 0.50 )Fe 2 O 4 . The study analyzes the evolution of ferrite relative to density and microstructure with peak sintering temperature and dwell time at peak temperature. The densification and grain‐growth rates ar…
This study evaluates neutrophil responses on aluminum oxide membranes. Using an in vitro cell culture system, we have found that the pore size (20 and 200 nm in diameter) of alumina membranes have a significant effect on leukocyte morphology and activation. Specifically, our results show that 20-nm pore-size membranes…
Abstract X-ray diffraction with a position-sensitive detector (XRD-PSD) was used to make a time-resolved study of the dynamics of deposition and dehydration of Na-montmorillonite crystallites on flat substrates from deionized water suspensions. The static PSD geometry and simultaneous counting procedure allowed the ac…