Materials Literature
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The miscibility of homogeneous diblock copolymers of 1-4-polybutadiene and cis-1-4 polyisoprene with either or both of the corresponding linear homopolymers was found to depend upon the relative lengths of the block segments and upon the coordinates of the binary or ternary mixture on the appropriate triangular compos…
SUMMARY Previous work, at foreign laboratories, essentially based on electron microscopy of longitudinal sections, has suggested a radial morphology for the aromatic poly‐amide high modulus fibres; the present paper gives direct evidence of such a morphology, thanks to a special preparation technique which allows a gr…
Compositionally modulated single-crystal InSb/GaSb superlattice structures have been grown by multitarget sputtering in order to investigate the effects of film growth parameters on the defect structure, abruptness, and coherence of sputtered heterojunctions. The layer thicknesses studied ranged from 12 to 70 Å. The p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic-exchange interactions in binuclear transition-metal complexes. 19. Imidazolate- and biimidazolate-bridged copper(II) complexes. Crystal structure of .mu.-biimidazolato-bis(1,1,4,7,7-pentamethyldiethylenetriamine)dicopper(II) tetraphenylborateMuin S. Haddad, Eileen N…
The guest-host interactions of pleochroic dyes dissolved in nematic liquid crystals has been reviewed, particularly with respect to the application in electrooptic displays. The role of the dye structure and the liquid crystal mixture is considered with respect to factors such as order parameter, absorption spectra an…
In vitro corrosion experiments were conducted employing potentiostatic polarization techniques, a saline environment and candidate biomaterial alloy/carbon combinations. Corrosion currents and potentials of carbon/metal couples were predicted by mixed-potential theory utilizing the polarization curves generated. The a…
The crystal and molecular structures of the title complexes cis-[MoO2Br2(PPh3O)2](1), cis-[MoO2Cl2(PPh3O)2](2), and the i.r. spectra of these complexes and of a third complex, cis-[MoO2F2(PPh3O)2](3), have been determined. Crystal data: (1), space group P21/c, Z= 4, a= 19.081(1), b= 9.964(1), c= 19.202(1)Å, β= 111.52(…
Article General Aspects of Trace Analytical Methods—IV. Recommendations for Nomenclature, Standard Procedures and Reporting of Experimental Data for Surface Analysis Techniques was published on January 1, 1979 in the journal Pure and Applied Chemistry (volume 51, issue 11).
A simplified technique to prepare fungal specimens for scanning electron microscopy is described and discussed. Fixation in either 6% glutaraldehyde or 2% Os04 (both unbuffered aqueous solutions), yielded good results. The minimum fixation time in OSO4 was 2 h, in glutaraldehyde 4 to 5 h. Chemical dehydration with 2-m…
Abstract Although synthetic fibers have achieved much greater importance in the textile industry over the years, wool still remains the fiber type most frequently encountered in Home Office forensic science laboratories.
(1979). Phase Behavior of Some Linear Polyphenyls. Molecular Crystals and Liquid Crystals: Vol. 49, No. 7, pp. 207-209.
Abstract Microscopic observations and Coulter counter measurements of the secondary nuclei produced when a parent crystal of potash alum was contacted with a solid rod suggest that these nuclei are born by an attrition mechanism which appears to be dependent on the growth rate of the crystal. The nuclei can be up to 5…
X-ray diffraction results are presented on very well aligned samples of several smectic B phases which show the existence of several kinds of interlayer correlations. The hexagonal closepacked layers may be stacked with ordered ABA... or ABCA... arrangements (where A, B and C denote the relative position of the layers…
The adhesion of uniform spherical colloidal particles of chromium hydroxide (modal diameter 0.28 µm) on stainless steel surface and their subsequent removal by rinse solutions of various pH and Ca(NO3)2 concentrations were studied using the packed column technique. The particles were deposited on steel at pH 5. The pH…
The solid solubility in equilibrium with hydride and the diffusion coefficient of hydrogen around room temperature are determined in pure vanadium and its alloys. Both determinations are made with the resistivity measurement. The solid solubility is increased by the addition of Ti and Zr, slightly increased by Mo, not…
Abstract Nuclear magnetic resonance and dielectric data on hydrated collagen are interpreted in terms of Ramachandran's hydration model. It is found that all data are compatible with this model, indicating two specific binding sites per three amino acids in the threefold collagen helix. Sorption data have been interpr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRhenium formyl and carboxy complexes derived from the cyclopentadienyl(dicarbonyl)nitrosylrhenium(1+) cation: models for the Fischer-Tropsch and water gas shift reactionsCharles P. Casey, Mark A. Andrews, and James E. RinzCite this: J. Am. Chem. Soc. 1979, 101, 3, 741–743Pub…
Tackification of block copolymers of the linear ABA or radial (AB) x type, in which the center block (B) is in the rubbery state at use temperature, follows principles established for other rubbery polymers except for peculiarities of the systems introduced by the block polymer domain structure. Successful pressure-se…
Image profiles obtained in the scanning electron microscope operating in the charge-collection mode are calculated for a dislocation perpendicular to a surface barrier. The image resolution is not limited by the minority-carrier diffusion length in the semiconductor, but only determined by the generation volume, in ag…
The pathway of acetate assimilation in Methanosarcina barkeri was determined from analysis of the position of label in alanine, aspartate, and glutamate formed in cells grown in the presence of [14C]acetate and by measurement of enzyme activities in cell extracts. The specific radioactivity of glutamate from cells gro…