Materials Literature
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A series of flexible polyurethane slabstock foam samples were prepared with varying water content and studied using transmission electron microscopy (TEM), video-enhanced optical microscopy (VEM), and small-angle X-ray scattering (SAXS). A new TEM sample preparation technique was developed in which the foam is impregn…
All articles of this category pyrroles - formylation - pyrrole-2,5-dicarbaldehydes
The host-associated luminescence of highly dense transparent YAG ceramic material is characterized and compared to that of a single crystal. The UV emission from the ceramic shows a red shift of almost 100 nm from its position in the single crystal, along with major differences in excitation spectrum. The disparities…
An experimental investigation has been conducted to reduce NOx from combustion flue gases by means of corona discharge activated methane radical injection methods. Two types of corona radical injectors, the hollow needle type and the multihole type, are used in the present investigations. Experiments are conducted for…
Monolithic polymer-derived Si–C–N ceramics were processed by blending 70 vol% of both crosslinked and pyrolyzed Si–C–N powder particles with an oligomeric Si–C–N precursor (liquid polysilazane). The respective Si–C–N powder particles were prepared from the same liquid precursor, however, pre-heated at 300 and 1000 °C.…
We study the crack patterns produced by thermal shock in ceramic tableware. Cracks produced at sufficiently high-temperature gradients partition the surface plane of a ceramic material into cells forming a random two-dimensional space-filling cellular structure. The topological and geometrical properties of these stru…
There has been enormous interest in preparing the superhard material ${\mathrm{C}}_{3}{\mathrm{N}}_{4}$, with the large nitrogen concentration being one factor limiting preparation. Using an ab initio supercell approach we simulate the electronic structure about a N vacancy and investigate the effect it has on the bul…
This paper shows how structure and formation of metal-polymer interfaces depend strongly on the preparation process and the interfacial chemistry. Emphasis is placed on results obtained from transmission electron microscopy (TEM), X-ray photo electron spectroscopy (XPS), radiotracer measurements and computer simulatio…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation S. L. Elliott, W. B. Russel; High frequency shear modulus of polymerically stabilized colloids. J…
In April 1995, Health Physics published a review paper titled "Radioactive Materials in Recycled Metals." At that time, 35 accidental meltings of radioactive sources in metal mills were reported, including 22 in the U.S., along with 293 other events in the U.S. where radioactive material was found in metals for recycl…
The degradation mechanism of hydrogen storage alloy in nickel‐metal hydride (Ni‐MH) sealed batteries and effects of corrosion on cell performance during cycling are investigated. A general equation for the corrosion of AB 5 alloy is derived from analyses of corrosion products in cycled electrodes and measurements of n…
The cholesteric polymer films described here, i.e., the “locked in” chiral nematic phase of polymer liquid crystals, have several advantages as materials for optical applications. The Figure shows schematically a cholesteric network based on a chiral isocyanate terpolymer in styrene in which the cholesteric liquid-cry…
Certain applications of magnetic materials require the knowledge of the magnetocaloric effects, i.e., the adiabatic change of temperature or the isothermal change of the entropy upon application or removal of magnetic field. While the isothermal magnetic entropy change can be calculated from magnetic data only, the ca…
Abstract Two‐proton exchange along the two hydrogen bonds mediates the tautomerization in benzoic acid (BA) dimers. Optical spectroscopy and quasi‐elastic neutron scattering (QENS) have been employed to characterize the proton dynamics in doped and pure BA crystals. The proton motion in BA is governed by a multidimens…
Electrochemical characteristics of three types of (LSC) and (LSM) electrodes, (dense, porous, and porous/dense double layer) were measured. The dense layers of LSC and LSM were prepared by a laser ablation method and the porous layers were prepared by a tape‐casting method. Electrochemical measurements (ac impedance a…
Mixtures consisting of polyamine (branched polyethyleneimine (PEI) and polyallylamine (PAA)) and n-alkanoic acid (C n: n = the carbon number of alkanoic acid) were prepared and their thermal and liquid crystalline properties were examined. The occurrence of proton transfer from the carboxylic acid to the amine groups…
In earlier sodium dodecylsulfate-polyacylamide gel electrophoresis (SDS-PAGE) studies it has been found that commonly utilized commercial hen egg-white lysozyme (HEWL) preparations contained 0.2-0.4 mol% covalently bound dimers. Here it is shown, using high-performance capillary electrophoresis (HPCE), that HEWL conta…
Using a two-dimensional self-consistent field calculation, we determine the equilibrium morphology of thin films of ABC triblock copolymers confined between hard, smooth plates. The B segment is chosen to be the central block and all the blocks are incompatible. The chains microphase-segregate into a lamellar phase, w…
Dielectric relaxation has been observed for a wide variety of materials. Specifically for dielectric thin films, a typical Curie - von Schweidler relaxation has been reported by many groups in the literature. Although some possible reasons for these relaxation phenomena have been discussed, a comprehensive understandi…
Benzene oxidation at two equivalence ratios (φ = 0.19 and 1.02) was studied in a well-mixed reactor with a 50 ms mean residence time at 350 torr and 900–1300K. The temperature for 20% benzene conversion is shifted to approximately 90K higher temperatures for the stoichiometric condition as compared to the lean conditi…