Materials Literature
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The epitactic growth of calcium hexaluminate (CA6) on the basal plane of alumina was observed during an investigation of the interaction between silicate glass films deposited on single-crystal alumina (α-Al2O3). Two distinctly different orientation relationships occurred. The first can be described as perfect hexagon…
In situ spectroscopic ellipsometry (SE) has been successfully used to accurately measure sputter deposition rates and optical constants of un-oxidized metal layers and to control the growth of magnetic multilayers. The structures include [Co/Cu]n, [Co/Au]n, [Co/Ni]n, [Co/Pd]n and [Co/Pd/Au]n. Layer thickness precision…
The synthesis of a hitherto unknown 6 : 5 phase in the quasi-binary system RbCl/PbCl2 and its structure determination is reported. The compound Rb6Pb5Cl16 crystallizes in the tetragonal space group P4/mbm with a large variety of different coordination polyhedra for the cations. Special feature of the structure is a st…
The nonspecific phospholipase C from Bacillus cereus is a zinc metalloenzyme that catalyzes the hydrolysis of phospholipids to yield diacylglycerol and a phosphate monoester. Glu-4 has been proposed as a potential candidate for the general base in the hydrolysis reaction and was shown to interact with the substrate he…
A series of cyclic(arylene ether) oligomers containing the phenylphosphine oxide moiety has been synthesized by reaction of bis(4-fluorophenyl)phenylphosphineoxide with dihydroxy compounds 1a–d as well as 1,2-dihydro-4-(4-hydroxyphenyl) (2H)phthalazin-1-one in DMF in the presence of anhydrous K2CO3 under high dilution…
The synthesis of a series of meso-5,15-diphenylporphyrins strapped by 2,2'-disubstituted biphenyl units (6H(2), 7H(2), 8H(2)) is described. The biphenyl straps used are linked via their 3,3'-positions by CH(2)O groups to ortho-positions of the phenyl rings of the 5,15-diphenylporphyrins. The straps of these porphyrins…
The broad molecular weight distribution (MWD) curves obtained by gel-permeation chromatography (GPC) of polyethylenes prepared in the presence of MgCl2 supported monometallic (Ti or Hf) and bimetallic (Ti/Hf) catalysts were analyzed by deconvolution into component curves. The MWD curves of the monometallic catalysts c…
Abstract A new method of measuring carbon black dispersion in rubber is presented. This method is based on the measurement of the light reflectivity from the rubber sample using standard equipment used in the evaluation of the tint strength of carbon black (ASTM D3265 procedure). This method can be applied for both un…
Abstract The technology of extruding rigid viyl foam has grown substantially over the last 10 years. Formulation additives, tooling and processing expertise have made possible a variety of applications such as profile, sheet, and foam core pipe. Many PVC foam manufactures are interested in reducing the density of thei…
Fractographic features related to fatigue growth in a titanium alloy Ti–6Al–3Mo–2Cr were examined in compressor disks that had failed in service. In‐flight block cyclic loading that included hold‐time loading and variable amplitudes of vibrational loading produced fracture characteristics which mainly reflected the tw…
NADP(+)-specific isocitrate dehydrogenase (EC 1.1.1.42) was purified to homogeneity from the sulfate-reducing bacterium Desulfobacter vibrioformis, and shown to be a monomeric protein with a molecular mass of 80 kDa. The pH and temperature optima were 8.5 and 45 degrees C, respectively. The N-terminal amino acid seque…
This work continues our study of the hot melt adhesive (HMA) model published earlier [1]. This HMA model was developed based on the pressure sensitive adhesive (PSA) tack model established previously [2]: P = P 0 BD (1) where P is the adhesive bond strength, P 0 is the interfacial (intrinsic) adhesion term, B is the b…
Abstract Limiting oxygen index (LOI) value, glass transition temperature (T g ), thermal degradation profile, morphology, and tensile strength and elongation at break of the flame-retarding polycarbonate (PC)-poly(acrylonitrile- butadiene-styrene) (ABS) (7/3) blends were studied. The flame retardants used were huntite…
Abstract We have examined gamma sterilization compatibility for many of medical packaging materials. Techniques used include thermal analysis, physical testing, optical property evaluations, and failure analysis. For a variety of PVC formulations, gamma radiation often leads to discoloration. This results from conjuga…
Mono-layers of stearic and behenic acids, deposited with the Langmuir-Blodgett technique, were used as aligning films in nematic liquid crystal cells. During the filling process the liquid crystal adopts a deformed quasi-planar alignment with splay-bend deformation and preferred orientation along the filling direction…
A diffraction geometry utilizing convergent X-rays from a polycapillary optic incident on a stationary crystal is described. A mathematical simulation of the resulting diffraction pattern (in terms of spot shape, position and intensity) is presented along with preliminary experimental results recorded from a lysozyme…
The acid‐base properties of aluminum surfaces have recently attracted much interest due to their consequences on the adhesion of organic coatings. The present work deals with a novel photoelectrochemical approach to the acid‐base properties of aluminum surfaces. Passive films were considered here as wide‐gap semicondu…
Sintering and crystallization of a 23.12 mol% Li 2 O, 11.10 mol% ZrO 2 , 65.78 mol% SiO 2 glass powder was investigated. By means of thermal shrinkage measurements, sintering was found to start at about 650°C and completed in a very short temperature interval (Δ T similar/congruent 100°C) in less than 30 min. Crystall…
New poly(azomethine urethanes) (PAMU) with linear structures were prepared in the conventional literature manner by reacting 4,4′-methylene bis(4-hydroxybenzylideneaniline) and 4,4′-methylene bis(2-hydroxybenzylideneaniline) as azomethine bisphenols, with various diisocyanates such as 4,4′-methylene bis(4-isocynatophe…
Some aspects of thermal fracture mechanics of ceramics with temperature-dependent properties are studied. It is first shown that the square-root singular field still prevails in the crack tip region. However, the size of the K-dominant zone may be influenced by the effect of temperature-dependent properties. Then the…