Materials Literature
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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…
Photo electrochemical current response of passive film was investigated for pure Cr and Fe-xCr (x = 8, 14, 18) alloys polarised potentiostatically in 0.1 kmol.m -3 H 2 SO 4 solution. Photo electrochemical action spectrum could be separated into two or three constituents. These components were considered to be derived…
Summary The cellular anatomy of the green alga, Chara corallina, was exploited to isolate putative plasmodesmataassociated proteins. In C. corallina , large internodal cells are symplastically connected via intervening nodal complexes of smaller cells which have plasmodesmata in their cell walls. Comparison of protein…
The effectiveness of chlorinated polyethylene-graft-polystyrene (CPE-g-PS) as a polymeric compatibilizer for immiscible poly(vinyl chloride)/polystyrene (PVC/PS) blends was investigated. The miscibility, phase behavior, and mechanical properties were studied using differential scanning calorimetry (DSC), dynamic mecha…
Vascular prostheses coated with collagen carefully prepared to avoid contamination were tested to see if it could induce endothelial cell lining throughout the graft surface in a natural way. The collagen fibers were succinylated. Hydrogel produced with the succinylated collagen was used for the sealant to reduce the…
A series of new soluble aromatic polyimides with inherent viscosities of 0.65–1.12 dL/g were synthesized from 1,3-bis(4-aminophenyl)-4,5-diphenylimidazolin-2-one and various aromatic tetracarboxylic dianhydrides by the conventional two-step procedure that included ring-opening polyaddition and subsequent thermal cyclo…
The magnetic susceptibility of the diluted magnetic ${\mathrm{Lu}}_{2\ensuremath{-}x}{\mathrm{Gd}}_{x}{\mathrm{O}}_{3}$ $(x=0.06,$ 0.10, 0.22, 0.40, 1.00, 1.40, 1.80) was measured in the temperature range 1.7--295 K. The inverse susceptibility changes slope to a smaller value below 2.2 K for the samples with $x<~0.…
Abstract Monte Carlo simulations of bulk polyethylene were performed on a high‐coordination lattice. In this study, we investigated the effect of coarse‐grained short and long range interaction parameters on the dynamic properties of the bulk system. As a result of fine tuning of the simulation parameters, our coarse‐…
This paper introduces a method of objectively designing the optimum silhouette of ladies' garments based on fabric mechanical properties, rather than relying on designers' experience. The optimum silhouette is objectively discriminated by a discriminant equation. Approximately 300 fabric samples for ladies' garments a…