Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent titanium chemistry. Synthesis, reactivity, and x-ray and neutron diffraction studies of Ti(BH4)2(dmpe)2 and Ti(CH3)2(dmpe)2James A. Jensen, Scott R. Wilson, Arthur J. Schultz, and Gregory S. GirolamiCite this: J. Am. Chem. Soc. 1987, 109, 26, 8094–8096Publication Da…
Abstract A series of rigid rod polyimides 1a–f derived from pyromellitic anhydride (PMDA) and 2,5‐di‐n‐alkoxy‐1,4‐phenylenediamine containing flexible alkoxy side chains with 4 to 16 carbon atoms was prepared by solution polycondensation. As demonstrated by model experiments full conversion to the imide structure is a…
Slow strain rate tests (SSRTs) were conducted to study the effect of electrode potential on the intergranular stress corrosion cracking (IGSCC) of Alloy 600 in deaerated 0.01 M H3BO3 + 0.001 M LiOH solution at two different partial pressures of molecular hydrogen at 350 C, using tensile specimens with a cold-pressed h…
Time-domain spectroscopy is used to study the complex permittivity of two types of liquid crystals: heptylcyanobiphenyl (7CB) and octylcyanobiphenyl (8CB). The variation of the dominant relaxation frequency values of both 7CB and 8CB as a function of temperature are very similar, showing no influence of the smectic st…
Abstract have been investigated as function of substrate used and experimental conditions.
Abstract The hyper‐Raman spectra of K 2 SnCl 6 crystals were measured for various scattering geometries at ambient temperature. The F 2u deformation mode of [SnCl 6 ] 2− , which is inactive in infrared and Raman spectra but hyper‐Raman active, was observed at 112 cm −1 . The TO and LO frequencies of an F 1u species ar…
Abstract The production of reinforced plastics has constantly increased since the Second World War. With a forecast growth rate of 8 to 12 percent annually over the next decade, composites are one of the fastest growing sectors of the plastics industry. Advanced composites will show the largest expansion, due to a str…
The corrosion products of steel plate obtained in aqueous solution in the presence or absence of an external magnetic field of 40 oersted (Oe) were studied. The Mössbauer phase composition data of the rust show that the magnetic field has an influence on the corrosion mechanism.
Mr=419.87, trigonal, P3cl, a=7.198(1), c= 13.076 (1) ~k, V = 586.7 A, 3, Z = 6 (30 Mn and 12 Ge per unit cell), Dx=7.129Mgm -3, A(MoKa)= 071069~, /x=31.0mm -~, F(000)=1134.0, T= 295 K. The crystal structure of ~r2-MnsGe2 has been determined using diffraction data derived from a mixed crystal of ~r~-Mns.l~Ge2 and ~'2-M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced electron-transfer reaction from the excited triplet state of ethylindium(III) tetraphenylporphyrin to tetracyanoquinodimethane. Cleavage of the carbon-indium bond in 2-methyltetrahydrofuranMinoru Yamaji, Yoshimasa Hama, Shigeyoshi Arai, and Mikio HoshinoCite thi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModel for a cascade crystallizer in the presence of growth rate dispersionLie Ding Shiau and Kris A. BerglundCite this: Ind. Eng. Chem. Res. 1987, 26, 12, 2515–2521Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Published inissue 1 Dece…
Calcium aluminate glasses show high sensitivity to ultraviolet radiation without the doping of optically active components. A mechanism is proposed to account for their photosensitivity on the basis of the result that the cause of UV‐induced coloring is the emergence of two kinds of paramagnetic centers, an aluminum‐o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemical and electrochemical characterization of the iron-iron multiple-bonded [Fe2(.eta.5-C5H5-xMex)2(.mu.-NO)2]n dimers (x = 0, 1, 5; n = 0, 1-): a structural-bonding analysis of the iron and cobalt nitrosyl bridged [M2(.eta.5-C5H5)2(.mu.-NO)2]n series (M = Fe, n = 0…
Alpha implantations in boron carbide samples were carried out different controlled temperatures ranging from 750 to 1720°C and the irradiated samples were observed in an electron microscope. Below 1500°C one part of the implanted helium produces lenticular bubbles within the grains whereas another part accumulates at…
Abstract The paper starts with some general introductory comments on properties and influence factors such as biocompatibility, surface structure, processibility and purity. Hence it is derived that polyurethanes deserve special attention as biomaterials, which is explained by the variability of the structure. A numbe…
Raman spectra have been recorded for glasses in the binary systems CeO 2 ‐P 2 O 5 and Pr 2 O 3 ‐P 2 O 5 . The cerium phosphate glasses were prepared having different concentrations of CeO 2 and the praseodymium phosphate glasses with different ratios of Pr 3+ to Pr 4+ . The spectra indicate that both cerium and praseo…
Calcium aluminate glasses show high sensitivity to ultraviolet radiation without the doping of optically active components. In this paper, photosensitive characteristics and the cause of UV‐induced coloring were investigated for these glasses. Ultraviolet rays below 270 nm were effective for inducing the coloring. The…
Abstract A ternary‐solvent HPLC method for analysis of the components of the tumor‐localizing product HPD is described. This HPLC system was used to assess the utility of a new method, based on gel exclusion chromatography, for purification of hematoporphyrin.
The complex dielectric constant ε as well as the complex piezoelectric constant d and the complex elastic constant s of iron doped PZT ceramics were measured after poling as a function of time. It was found that the aging behaviour of the material parameters is similar. The time dependence of the losses shows that agi…
The diatom genus Cyclostephanos Round is invalidly published because a legal type was not designated at the time of description. Round apparently intended for Stephanodiscus novaezeelandiae Cleve to be the type of the genus. That species is proposed here as the lectotype of the name Cyclostephanos and a lectotype is p…