Materials Literature
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<div class="htmlview paragraph">ϵ-caprolactam was polymerized in the interlayer space of montmorillonite, the clay mineral yielding a nylon-clay hybrid (NCH). X-ray and TEM measurements revealed that each template of the silicate, which was 1 nm thick, was dispersed in the nylon 6 matrix, and that the interlayer…
The density and refractive index variation with temperature in N(p-n-butoxybenzylidene)p-n-alkylanilines viz., 40.m compounds for m = 4 to 12 are presented. The density, thermal expansion coefficient and the refractive index results infer first order character for IN, AB and CB transitions and a second order character…
Isocyanide and chelate complexes have medical implications. Chelate complexes containing di- and triisocyanide could not, however, be synthesized in the past because of the extreme ring strain in the almost linear MC NR unit. With novel triisocyanide ligands (1 (sketched on the right), and (N(CH2CH2CH2NC)3) an only…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new tetranuclear chromium(III) complex with a [Cr4O2] core: synthesis, structure, and magnetic properties of [Cr4O2()2CCH3)7(bpy)2]PF6 (bpy = 2,2'-bipyridine)Avi Bino, Ruthie Chayat, Erik Pedersen, and Andreas SchneiderCite this: Inorg. Chem. 1991, 30, 4, 856–858Publicatio…
SUMMARY Current scanning electron microscopes, equipped with field emission guns and high‐performance immersion lenses, can achieve spatial resolutions of the order of 1 nm in both secondary and backscattered imaging modes over a wide range of operating energies. The generation and interpretation of images with nanome…
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…