Materials Literature
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Mechanism and effect of DC charge accumulation on the surface of a solid insulating support (spacer) have been studied in compressed SF/sub 6/ gas using various cylindrical model spacers. The distribution of surface charged is closely related to the normal component (gas side) E/sub n/ of electric field on the spacer…
Several new classes of polar and non-polar bicyclohexane liquid crystals comprising alkenyl side chains are presented. The compounds exhibit low optical anisotropies, Δn, < 0.1 and rotational viscosities, γ1, as low as 35 cP at 22°C. This leads, in combination with large elastic expressions k = k 1 + (k 3 - 2k 2)/4 >…
Abstracts A novel degumming process is described that is applicable to both undegummed and water‐degummed oils. Such totally degummed oils have residual iron contents below 0.2 ppm Fe and residual phosphorus contents that average below 5 ppm P. Therefore, they can be physically refined to yield a stable refined oil wh…
An experimental study of the dendritic growth of pivalicacid crystals in the presence of an external controlled Stokes flow is performed. A new experimental law, relating the value of product ${\ensuremath{\rho}}^{2}$V to the external flow velocity, is found.
The Preisach (1935) model has been discussed and extended in papers concerned with ferromagnetic phenomena. More recently, there is a growing interest in the Preisach model as an object of mathematical study. The author summarizes some of these results. Continuity properties and the inverse operator are discussed, and…
The iron and acid-labile sulfide contents and the electron paramagnetic resonance (EPR) properties of hydrogenase I (bidirectional) and hydrogenase II (uptake) of Clostridium pasteurianum (strain W5) have been determined on the basis of quantitative amino acid analyses. The iron and acid-labile sulfide values are appr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnhancement of nitric oxide dimerization by micropore fields of activated carbon fibersKatsumi Kaneko, Naomi Fukuzaki, Kazunori Kakei, Takaomi Suzuki, and Sumio OzekiCite this: Langmuir 1989, 5, 4, 960–965Publication Date (Print):July 1, 1989Publication History Published onl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state emission of dicyanoplatinum(II) and -palladium(II) complexes of substituted 2,2'-bipyridines and 1,10-phenanthroline and x-ray crystal structures of isomorphous M(bpy)(CN)2 (bpy = 2,2'-bipyridine; M = Pt, Pd)Chi Ming Che, Li Yan He, Chung Kwong Poon, and Thomas C…
Mechanism and effect of DC charge accumulation on the surface of a solid insulating support (spacer) have been studied in compressed SF/sub 6/ gas using various cylindrical model spacers. The distribution of surface charged is closely related to the normal component (gas side) E/sub n/ of electric field on the spacer…
We present a density functional approximation for the free energy of a system of hard bodies with arbitrary shape and orientational distribution. For systems with homogeneous density it reduces to existing treatments, which describe the isotropic liquid and the nematic liquid crystal. The treatment of the inhomogeneou…
Abstract The relationship between soil K forms (water soluble, exchangeable, HNO 3 ‐extractable, and mineral) as a function of clay mineralogy and taxonomy, was determined using 102 soils from the continental USA and Puerto Rico, representing 10 soil orders. These relationships may have use in evaluating potential soi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear iron system ferromagnetic in three oxidation states: synthesis, structures, and electronic aspects of molecules with a Fe2(OR)2 bridge unit containing Fe(III,III), Fe(III,II), and Fe(II,II)Barry S. Snyder, George S. Patterson, Andrew J. Abrahamson, and Richard H. H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetastable aluminum chloride, AlCl, as a solid and in solutionMatthias Tacke and Hansgeorg SchnoeckelCite this: Inorg. Chem. 1989, 28, 14, 2895–2896Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published inissue 1 July 1989https://pubs.ac…
Surface modification techniques such as wet chemical etching, oxidizing flames, and plasma treatments (inert ion sputtering and reactive ion etching) have been used to change the surface chemistry of polymers and improve adhesion. With an increase in the use of polyimides for microelectronic applications, the techniqu…
Until now, liquid-crystalline compounds with high negative dielectric anisotropy were usually realized by a lateral cyano group. A drawback to these cyano substituted liquid crystals, namely the considerable increase in the viscosity and the reduction of the thermodynamic stability of the mesophase, has been circumven…
Cellular structures are commonly used by nature as a means of optimizing the strength‐to‐weight ratio of a body. Cellular ceramics may have potential in structural applications requiring a high modulus‐to‐weight ratio. The models that are used to predict the mechanical behavior of these materials describe them as an i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLong-range electron transfer between tyrosine and tryptophan in peptidesM. Faraggi, Michael R. DeFelippis, and Michael H. KlapperCite this: J. Am. Chem. Soc. 1989, 111, 14, 5141–5145Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPillaring of a layered double hydroxide by polyoxometalates with Keggin-ion structuresTaehyun Kwon and Thomas J. PinnavaiaCite this: Chem. Mater. 1989, 1, 4, 381–383Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published inissue 1 July 19…
The incoherent dynamic structure factor Fs has been measured on concentrated dispersions of particles with interactions approximating hard spheres. The particle mean squared displacements and self-diffusion coefficients are obtained from Fs at times and scattering vectors where the Gaussian approximation (for Fs ) is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and chemistry of homocubanes, bishomocubanes, and trishomocubanesAlan P. MarchandCite this: Chem. Rev. 1989, 89, 5, 1011–1033Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published inissue 1 July 1989https://pubs.acs.org/doi/10.…