ChemInform Abstract: Porosity and Pore Size Distributions of Porous Silicon Layers
Abstract have been investigated as function of substrate used and experimental conditions.
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Hyper‐Raman spectra of K2SnCl6 crystals
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…
Survey of current status and future trends in reinforced plastics composites
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…
Mössbauer Analysis of Corrosion Products Obtained on Steel in a Low-Magnetic Field
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.
Structure determination of ζ2-Mn5Ge2 using a mixed crystal
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…
Photoinduced electron-transfer reaction from the excited triplet state of ethylindium(III) tetraphenylporphyrin to tetracyanoquinodimethane. Cleavage of the carbon-indium bond in 2-methyltetrahydrofuran
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…
Model for a cascade crystallizer in the presence of growth rate dispersion
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…
Photosensitive Mechanism of Dopant‐Free, Ultraviolet‐Sensitive Calcium Aluminate Glasses
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…
Stereochemical 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, 1-; M = Co, n = 1+, 0)
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…
Behaviour of implanted helium in boron carbide in the temperature range 750 to 1720°C
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…
Polymers for medical applications
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 of Rare‐Earth Phosphate Glasses
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…
Photosensitive Characteristics of Dopant‐Free, Ultraviolet‐Sensitive Calcium Aluminate Glasses
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…
PURIFICATION and ANALYSIS OF HEMATOPORPHYRIN and HEMATOPORPHYRIN DERIVATIVE BY GEL EXCLUSION and REVERSE‐PHASE CHROMATOGRAPHY*
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 aging behaviour of the complex material parameters ε, d and s in ferroelectric PZT ceramics
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…
Validation of the centric diatom genus nameCyclostephanos
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…
Low-frequency dielectric responses in PMN-type ceramics
Dielectric measurements in the frequency range (104 to 10-3 Hz) are presented for opaque PMN [Pb(Mg1/3Nb2/3)O3] hot-pressed ceramic samples. Equivalent results for transparent lanthanum-doped PMN and PMN (90%): PbTiO3 (10%) are also presented. Observation of “Anomalous Low-Frequency Dispersion” has new implications fo…
FINES DESTRUCTION DURING BATCH CRYSTALLIZATION
An analysis of the use of fines destruction during batch crystallization based on the population (number) balance is presented. The effects of operating policy and fines crystal cut size and destruction rate are examined in detail for two cases viz. natural and controlled cooling respectively. It is predicted that use…
Anisotropic reinforcement in elastomers containing magnetic filler particles
Abstract Magnetic particles of iron oxide were blended into portions of a high molecular weight sample of poly(dimethylsiloxane) which were then peroxide cured in a magnetic field. Strips cut from the resulting elastomers parallel and perpendicular to the magnetic lines of force were studied with respect to their equi…
Crystal chemistry and genesis of Nb-, V-, and Al-rich metamorphic titanite from Egypt and Greece
Titanite CaTiOSiOa from calc-silicate rocks of Gebel Umm Shagir, Egypt, associated with garnet, p,'roxene, scapolite, calcite and quartz, contains up to 11 wt.9o Nb2O5, 6 wt.9o Al2O3 and2 *t.Vo V2Oj. Other elements present in minor amounts are Fe, Ta, Sn, and F. The main substiturions are2Ti : Nb + AI, Ti + O = Al + (…