Materials Literature
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Departures from standard Lifshitz-Kosevich behavior observed in the oscillatory magnetization and magnetoresistance of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) charge-transfer salts in high magnetic fields are investigated using a numerical model of the Landau levels in a quasi-two-dimensional metal. The numer…
The structure of an orthorhombic phase (ξ′ phase) with Al73·5Pd224Mn4·1 composition was solved by applying the direct methods and refined by a least-squares procedure. The space group is Pnma and the magnitudes of cell parameters are a = 23·541 Å, b = 16·566 Å and c = 12·339 Å. The final reliability factor is R = 0·07…
Boron‐doped diamond electrodes have many possibilities for electroanalytical and electrosynthetic application because of their stability and range. However, their combination of semiconductive origin, nearly metallic resistive characteristics when heavily doped, and surface inertness make the understanding of electron…
We present a study of the morphology dependence of the photoluminescence (PL) properties of the pyridine-based polymers poly(p-pyridyl vinylene), poly(p-pyridine), and poly(p-pyridyl vinylene p-phenylene vinylene) (PPyVPV). The photoluminescence of solution samples is characterized by high quantum efficiency (>70%…
In April 1995, we carried a detailed review of the major suppliers of industrial peristaltic pumps. In this issue, we carry a short update, with news of a redesigned range, some interesting application stories and details of an additional supplier, not featured last year.
We report x-ray photoemission spectra of the surface of iron (III) oxide (γ-Fe2O3) particles. The research grade high purity (99.0%) (γ-Fe2O3) sample was commercially obtained from Alfa/AESAR. The XPS spectra were measured with the Physical Electroncs Model 5400 x-ray photoelectron spectrometer using unmonochromatized…
We report x-ray photoemission spectra of the surface of iron (III) oxyhydroxide (α-FeOOH) particles. Research grade purity (99.0%) α-FeOOH sample was commercially obtained from Alfa/AESAR. The XPS spectra were measured with the Physical Electronics Model 5400 X-ray Photoelectron Spectrometer using unmonochromated Mg K…
Most biological fluids are supersaturated with calcium salts. A mechanism controlling crystal growth is therefore necessary to prevent excessive precipitation and development of a lithiasis. In pancreatic juice, calcite precipitation is prevented by lithostathine, a glycoprotein that inhibits calcite crystal growth. W…
Ricki Lewis; Unraveling the weave of spider silk: One of nature's wondrous chemical structures is being dissected so that it can be used in human inventions, Bi
The reflection flat-sample asymmetric geometry is an attractive set-up for powder diffraction measurements, as compared to either conventional Debye–Scherrer or symmetric Bragg–Brentano geometries. Combined with grazing- or fixed-incidence-angle X-rays, it is suitable for surface-structure or thin-film texture analysi…
This paper describes an extension into three dimensions of an existing two-dimensional technique for simulating brittle solid fracture. The fracture occurs on a simulated solid created by "gluing" together space-filling polyhedral elements with compliant interelement joints. Such a material can be shown to have well-d…
Abstract Na2[(Hamp)2Mo5O15]·6H2O (where amp is adenosine-5′-monophosphate) has been crystallized by acidifying a solution containing Na2MoO4·2H2O and adenosine-5′-monophosphoric acid (AMP = H2amp) to pH 3—4. A single-crystal X-ray structural analysis of a colorless crystal of Na2[(Hamp)2Mo5O15]·6H2O [space group P3121…
Abstract To study runaway behavior in autoclave low‐density polyethylene (LDPE) reactors, a kinetic model for a perfectly stirred tank reactor is presented. The kinetic model not only includes the standard initiation, propagation, and termination reactions for polymerization, but it also has free radical reactions tha…
A rapid fixation/dehydration method of plant specimens for scanning electron microscopy is presented. Prior to critical‐point drying (CPD) the specimens are immersed in pure methanol. Methanol incubation instantly fixes the elastically extended cell walls. Owing to this instant fixation, shrinking of the specimens is…
Other| October 01, 1996 Synthesis, characterization, and energetics of solid solution along the dolomite-ankerite join, and implications for the stability of ordered CaFe(CO 3 ) 2 L. Chai; L. Chai Princeton University, Department of Geological and Geophysical Sciences, Princeton, NJ, United States Search for other wor…
The electrical performance of outdoor insulation degrades severely during combinations of factors that include surface contamination (C), ice (I), fog (F) and an ambient temperature that rises through 0 C (T{sub 0{degree}}). Failures at operating voltage on 115-kV, 230-kV and 500-kV systems occur with increasing proba…
The antiferroelectric (AFE)-ferroelectric (FE) phase transformation under dc bias and hydrostatic pressure conditions in tin-modified lead zirconate titanate ceramics [Pb(Zr,Sn,Ti)O3, i.e., PZST] was investigated. The shifting of transformation temperature under these conditions and an electric field induced lattice s…
Atomic force microscope examinations of the free surface and of microtome cuts of a cholesteric oligomer are reported. The obtained images lead to a model of the structure of cholesteric focal conic domains that appear spontaneously at the free surface. These domains develop in order to fulfill the boundary condition…
Abstract The influence of lactide configuration on the chain microstructure of lactide/ε‐caprolactone copolymer was investigated. The copolymerization was carried out in the presence of Al(acac) 3 , AlEt 3 and ZnEt 2 as initiators. The chain microstructure analysis of the copolymers was performed by means of 13 C NMR…
A modified electrochemical noise (EN) technique (electrochemical emission spectroscopy [EES]) was developed for nondestructive, real-time corrosion rate measurements. Unlike conventional corrosion-rate measuring techniques that use external signals, this technique uses signals generated by the corroding system. It can…