Materials Literature
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Crack resistance characteristics and fatigue properties have been studied in four types of Y 2 O 3 –TZP ceramics including one containing Al 2 O 3 . The largely linear‐elastic behavior connected with the very small transformation zone (<5 μm) explains the absence of any resistance‐curve behavior and the flaw‐contro…
Two configurations of the phase compensation method are presented to measure the cell gap of a filled twisted nematic liquid crystal display (TN-LCD). The twist angle of the TN-LCD can be any value between 0° and 360° and the pretilt angle can be any practical value. The cell gap measured by this method is the true TN…
Octa(dodecyl)etrapyrazinoporphyrazine (C12)8PzH2 the corresponding metal (II) complexes (C12)8PzM3M: Cu, Ni, Co, octa(2-ethylhexyl)tetrapyrazinoporphyrazine (2-EtC6)8PzH2 and the corresponding copper (II) complex (2-EtC6)8PzCu have been synthesized and their liquid crystalline states characterized. These properties ha…
Biofilm formation on 304 stainless steel (S30400) does not necessarily result in an ennoblement of the corrosion potential. Instead, biofilms composed of aerobic and anaerobic bacteria from Gulf of Mexico water formed an anaerobic biofilm/metal interface and caused the corrosion potential to move in the negative direc…
A new series of optically active dipole dopants - diesters of 4,4″-terphenyl dicarboxylic acid - have been prepared. Most of the components are high melting substances. Some of 2-chlorine substituted compounds show a chiral smectic C* phase. The Ps value induced by optically active dipole dopants depends on several fa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline polyethers based on conformational isomerism. 16. Hexagonal columnar phase (.PHI.h) in a nondiscotic copolyether based on 1,2-bis(4-hydroxyphenyl)ethane, 1,8-dibromooctane, and 1,12-dibromododecane, and the novel 2-dimensional-3-dimensional .PHI.h-sB trans…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of silver ionic clusters and silver metal particles in zeolite rho studied by electron spin resonance and far-infrared spectroscopiesBo Xu and Larry KevanCite this: J. Phys. Chem. 1991, 95, 3, 1147–1151Publication Date (Print):February 1, 1991Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic investigations of specific interactions in amorphous polymer-polymer blends: poly(vinylphenol) and poly(vinyl methyl ketone)Chuan Qin, Alfredo T. N. Pires, and Laurence A. BelfioreCite this: Macromolecules 1991, 24, 3, 666–670Publication Date (Print):February 1…
<div class="htmlview paragraph">The three-dimensional non-reacting flow field inside a typical dual-monolith automotive catalytic converter was simulated using finite difference analysis. The monolithic brick resistance was formulated from the pressure gradient of fully developed laminar duct-flow and corrected…
An electrochromic window was built using WO 3 as electrochromic material and V 2 O 5 as counterelectrode. Both were deposited onto ITO‐coated glass panes by vacuum evaporation and were amorphous to x‐ray diffraction. The electrolyte was a lithium‐conducting polymer consisting of a poly(ethylene oxide)‐lithium salt com…
A surprisingly low VIV/VV ratio is present in the cluster anion of 1. Its structure (picture right; V black, As shaded, O open circles) may be described as a {AsV12O38} unit with Oh symmetry. It is formed from twelve VO6 octahedra sharing edges, which each also share a face with the central AsO6 octahedron. Two additi…
Abstract The Kimmeridgian-Volgian(-Ryazanian) clay stone is the principal oil source rock in the troughs of the North Sea. Randomly (R0) ordered mixed-layer illite/smectite (I/S) appears to have transformed to R1-(IS) or R3-(ISII) ordered simultaneously with oil generation. The proportion of illite layers in I/S incre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface studies of polymer blends. 4. An ESCA, IR, and DSC study of the effect of homopolymer molecular weight on crystallinity and miscibility of poly(iε-caprolactone)/poly(vinyl chloride) homopolymer blendsMichael B. Clark, Cindy A. Burkhardt, and Joseph A. GardellaCite th…
The thermal stability of the ethyl, isobutyl, silaneopentyl and phenyl complexes 1–4 is surprising. At room temperature they are colorless, very volatile liquids and solids and are formed in a procedure (equation (a)), which is quite general.
Abstract Various approaches to the preparation and verification of single‐molecule single crystals are discussed for polyethylene and poly (oxyethylene). Analytic tools are electron microscopy, electron diffraction, and differential scanning calorimetry. The main difficulty in producing a single‐molecule single crysta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA reinvestigation of the molecular structures of cis-mer-MoOCl2(PR3)3: do bond-stretch isomers really exist?Keum Yoon, Gerard Parkin, and Arnold L. RheingoldCite this: J. Am. Chem. Soc. 1991, 113, 4, 1437–1438Publication Date (Print):February 1, 1991Publication History Publi…
The gene encoding aspartate aminotransferase of a thermophilic Bacillus species, YM-2, has been cloned and expressed efficiently in Escherichia coli. The primary structure of the enzyme was deduced from nucleotide sequences of the gene and confirmed mostly by amino acid sequences of tryptic peptides. The gene consists…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced resonance Raman scattering from cytochromes P-450 adsorbed on citrate-reduced silver solsBernard N. Rospendowski, Kim Kelly, C. Roland Wolf, and W. Ewen SmithCite this: J. Am. Chem. Soc. 1991, 113, 4, 1217–1225Publication Date (Print):February 1, 1991Publica…
Monte Carlo simulations are performed on the rhombohedral random-tiling model of icosahedral quasicrystals. Long-range order is observed in agreement with a squared-gradient form of the coarse-grained free energy, and the two independent phason elastic constants are determined. Schematic transmission electron microgra…
We found that the stable decagonal quasicrystal of Al-Cu-Co undergoes a structural change at low temperatures. The Al 65 Cu 15 Co 20 alloy quenched from 800°C shows diffraction patterns with sharp spots placed at nearly perfect decagonal symmetry positions, but by annealing at 550°C the diffraction patterns show a rem…