Materials Literature
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Defects and textures were studied in the discotic mesophases formed by an hexa-alkoxy-triphenylene (the pentyl derivative). Two main textures are distinguished, with molecular stacks lying mainly vertical or horizontal. The vertical texture is more frequent between slide and coverslip; the second one is favoured by th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbonyl, thiocarbonyl, selenocarbonyl, and tellurocarbonyl complexes derived from a dichlorocarbene complex of osmiumGeorge R. Clark, Karen Marsden, Warren R. Roper, and L. James WrightCite this: J. Am. Chem. Soc. 1980, 102, 3, 1206–1207Publication Date (Print):January 1, 1…
Electron microscope studies have been made of the propagation of shear cracks and the distribution of dislocations in the plastic zone during in situ tensile deformation of stainless steel single crystals. In thin-foil specimens under plane stress conditions, the plastic zone was coplanar with the crack and it represe…
We present a review of the physical properties of ferroelectric liquid crystals in the chiral smectic C* phase. We describe the measurements of spontaneous polarization and related quantities. We discuss the effects of small and large electric fields on homogeneous textures.
The hydrogen embrittlement of an AISI 304 steel containing different amounts of α′ martensite has been studied by charging the specimens with hydrogen through cathodic polarization and subsequent tensile testing. Increasing α′ martensite content was found to have a great effect on the fracture surface morphology and t…
During the period 1950–1979 the author has, in co-operation with various co-workers, investigated some of the corrosion phenomena occurring in the application of copper materials. A survey is given of some conclusions reached in investigations on the following subjects: the electrode kinetics of copper in acidic coppe…
Abstract The formation of volatile pyrolyzates in poly(vinyl chloride) has been studied by pyrolysis–gas chromatography–mass spectroscopy. Isotopic distributions of pyrolyzates from experiments with perdeutero‐PVC show that pure conjugated aromatic pyrolyzates (e.g., benzene, styrene, naphalene, biphenyl, anthracene)…
A diatomic linear chain with non-linear polarizability in one sublattice is studied as a simplified version of a recent microscopic model for ferroelectric soft modes. The dispersion curves are described in a self-consistent approximation for all temperatures of the paraelectric regime. In three dimensions and for T≥T…
Buildup factors for photons in infinite homogeneous samples of air, water, and iron have been calculated by a moments method code. The photons were assumed to be emitted from a point source. Comparisons of these results to values obtained earlier, both by experiment and by calculation, show reasonable agreement except…
Infrared spectra of the water formaldehyde complex in argon and nitrogen matrices have been obtained. The complex shifts of the water fundamentals clearly show that water forms a hydrogen bond with formaldehyde. HDO prefers to form a D bond, but a metastable H-bonded complex is observed in nitrogen matrices below 20 K.
Freely suspended films of the material DOBAMBC ($p$-decyloxybenzylidene-${p}^{\ensuremath{'}}$-amino 2-methyl butyl cinnamate), which has a layered ferroelectric liquid-crystalline phase (the chiral smectic $C$ phase), are created across a rectangular hole in a glass microscope cover slide. The films are quantized in…
The first paper on librational modes (LMs) of water in hydrated solids appeared in 1956 [l], although some earlier papers mentioned them in the context of other studies [2–4]. No detailed review is available, but articles in some books on water [5, 6], hydrogen bonding [7], and infrared (IR) spectra of inorganic and c…
The physical fact that diamond is electrically insulating while amorphous carbon and graphite are conducting is used in the present work to study the local damage that each implanted ion creates around its track and to conclude about the processes through which implanted diamond turns amorphous. Experimental data for…
The liquid state behavior of the following atactic polymers has been reviewed: the alkyl and cycloalkyl methacrylates; polyisobutylene; polybutadiene, its random copolymers with styrene and acrylonitrile, and S-B diblocks; polystyrene; and the poly-α-olefins C3, C5, and C6. Just as Tg manifests itself through time-dep…
Tetrasulphophthalocyanine and the ZnII and CuII complexes have intense absorption in the near i.r. region but the compounds aggregate in aqueous solution. Aggregation is hindered by addition of organic solvents, such as pyridine, and here H2PcS4– and ZnPcS4– show strong fluorescence. Photophysical data have been colle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of selenides and tellurides with positive halogenating speciesMichael R. DettyCite this: J. Org. Chem. 1980, 45, 2, 274–279Publication Date (Print):January 1, 1980Publication History Published online1 May 2002Published inissue 1 January 1980https://doi.org/10.1021/…
The layered MnPS3 reacts with a wide range of ‘guest’ cations G+, leading to new intercalation compounds of the type Mn1 –xPS3,G2x,(H2O)y.
Photocurrent spectroscopy has been used to examine the early stages of anodic film growth on titanium. Analysis of the photocurrent conversion efficiency as a function of wavelength for films formed at different potentials has shown that the film is essentially pure TiO2 above ca.1.5 V vs. SCE (at pH 0). Photocurrent…
The porphyrin photosensitizer, meso-Tetra (4-N-methyl-pyridyl) porphine tetraperchlorate is shown to unwind supercoiled ColEI DNA at a somewhat lower concentration than ethidium bromide. In contrast to this, the Fe(III) chelate of T4MPyP cannot unwind supercoiled DNA. It is concluded that these results corroborate our…
Anion self‐diffusion coefficients normal to (1102) were obtained for single‐crystal Al 2 O 3 in a 1.3 × 10 3 N/m 2 (10 −5 torr) vacuum at 1585° to 1840°C. Tracer was supplied from an initial 650 to 1300 A Al 2 18 O 3 layer produced by the oxidation of vapor‐deposited Al metal films in an 18 O 2 atmosphere at 520°C. Co…