Materials Literature
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An actinometric optical emission spectroscopy (AOES) study of the trends in the concentrations of the plasma species H, CH, CO, OH, and CN in film-producing glow discharges of mixtures of isopropanol and nitrogen was undertaken. Conventional AOES was used to obtain the trends in the plasma concentrations of these spec…
double‐oxide films were formed on Pt substrates by low‐pressure metallorganic chemical vapor deposition using iron acetylacetonate and tetraisopropoxytitanium as precursors and as a reaction gas. Fe‐Ti alloys were fabricated by an ion‐beam sputter and an arc‐melting process. The corrosion resistances of the films and…
Tetramethylammonium sulfate, [N(CH 3 ) 4 ] 2 SO 4 , was prepared in high purity via ion exchange. Two reversible first-order phase transitions at 263 ± 3 and 462 ± 3 K have been established by differential thermal analysis and temperature-dependent X-ray powder diffraction. Crystal structure determinations at 223 and…
Several worst case scenarios were carried out for safety evaluation of an existing nitration process. Heterogeneous nitric acid decomposition is observed to be the worst credible scenario in the toluene nitration process. Fire or explosion may subsequently develop due to temperature or pressure runaway from the undesi…
Incommensurate tridymite L3-T O (MX-1) shows a cascade of five phase transitions at 65, HO, 150, 200, and 380 ℃ upon heating. The X-ray diffraction patterns were investigated with a Buerger precession camera revealing a sequence of four incommensurate phases in the range from room temperature to 200 ℃. The phases form…
Film-forming properties of plant proteins vary, depending on the protein's amino acid composition and molecular characteristics. Proteins from soy bean, wheat, and corn are readily available and films from these proteins have been investigated extensively. The proteins are normally dissolved or dispersed in suitable s…
A number of the new chiral side-chain menthyl containing copolymers were synthesized. Phase behavior, optical properties, and structures of the synthesized copolymers with different compositions were studied. For the first time a specific mesophase induction in side-chain copolymers, containing nonmesomorphous side gr…
Despite angle dependence and polarization selectivity, the color of cholesteric liquid-crystal (CLC) polysiloxane films can be quantified by standard colorimetry. A new fractured form of the film called “flakes” makes it possible to use the Center of Gravity Color Mixing Principle to predict the chromaticity of CLC co…
Bis(benzene)chromium [(η 6 -C 6 H 6 ) 2 Cr] (BBC) is shown to readily trap radical species R (R = H, D, isobutyronitrile (IBN)) to form complex paramagnetic adducts whose structure has been identified in frozen solution by ENDOR (electron nuclear double resonance spectroscopy). It is shown that radical attack yields t…
Results from a high-speed photographic study made at a framing speed of one million frames per second of the disintegration of Prince Rupert's drops made of soda-lime glass and immersed in a transparent liquid of a matching refractive index are described. The refractive index matching made the cracks through the drop…
A strong dependence of the rotational dynamics of the mesogenic units (β-relaxation) on the order of the mesophase was found in sidechain liquid crystal polymers. The preexponential frequency factor, \documentclass{article}\pagestyle{empty}\begin{document}$ f_{\beta \infty }^* $\end{document} and the activation energy…
Iron bands, fragipans and duripans are common in yellow low-activity clay soils developed from the Barreiras Group in coastal plateaus of northeastern Brazil. Such indurated horizons are found in depressions of the plateaus where sugar cane growth is greatly reduced. Little research has being done on the nature of the…
In the last 25 years, plastics have faced a massive demand in packaging technology due to their desirable properties, such as flexibility, light weight, etc. Moreover, their packaging applications have spread in the area of food and pharmaceutical products. Much concern has arisen from that fact as most of these plast…
Abstract Thermal decomposition of the ammonium analogue of the mineral dawsonite, NH4Al(OH)2CO3·H2O, yields high surface area γ-alumina. The surface area can remain as high as 145 m2/g after calcination at 1000 °C. NH4Al(OH)2CO3·H2O can also be used as precursor for alumina-based binary or mixed oxides. Treatment of N…
In rapid solidification experiments on metallic alloys structures have been observed which are periodic along the growth direction. The origin of these banded structures has been ascribed to an oscillatory instability of the solid-liquid interface characterized by large variations of the interface velocity; this insta…
The stability of thin liquid films on solid surfaces is fundamental to many phenomena such as dropwise and filmwise condensation, evaporation and boiling, as well as self-assembly of clusters and molecules. The free energy of a liquid film consists of a surface tension component as well as highly nonlinear volumetric…
peranne and powder neutron-diffraction data collected at 12 K. Single-crystal neutron-diffraction data, collected at room temperature by Rothbauer (1971), were re-examined using a split-site model for H in the sp:rce group CAc.Lnw-temperawe neutron-ditftaction data were used to evaluate the thermal-vibrational effect…
Point defects were found in as‐quenched GeO 2 , 65CaO35Al 2 O 3 , and 65SrO35Ga 2 O 3 glasses on the basis of electron paramagnetic resonance (EPR) measurements. These defects were identified as Ge É centers in GeO 2 glass and O ‐ 2 , O ‐ 3 , and M‐OHC (oxygen hole center) (where M = Al, Ga) in 65CaO35Al 2 O 3 and 65S…
Perfluoroalkyl-substituted benzothiazolyl bisazo dyes showed higher solubility and greater bathochromicity than the corresponding alkyl derivatives. These dyes showed good dichroism (order parameter S>0.75).
Abstract Polymerisation conditions have a remarkable effect on the various material properties of polypyrrole. Care has to be taken to ensure identical conditions for electrochemical experiments when films electropolymerised differently are examined in comparison. The effect of a variety of experimental parameters on…