Materials Literature
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Abstract A protoporphyrin IX derivative having a phospholipid residue (lipid-porphyrin) was synthesized. The lipid-porphyrin itself formed an oval multilamellar vesicle in an aqueous medium. The spectral features of the lipid-porphyrin vesicle indicated a stacked configuration of the porphyrin moiety.
Article The crystal structure of wolframite type tungstates at high pressure was published on November 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 207, issue 1-2).
Analysis of net and bottle samples from the southern Gulf of Mexico allowed documentation of the morphological variation exhibited by 201 chains of the planktonic diatom Chaetoceros diversus Cleve. Considerable variation existed in the length (i.e. number of cells) and curvature of chains, dimensions of individual cel…
The texture and microstructure of rolled and annealed pure Ta was investigated by means of quantitative texture analysis and metallography. The rolling textures were discussed using simulations according to Relaxed Constraints Taylor Theory. The annealed samples revealed recovery and continuous recrystallization for w…
Abstract Isotropic and oriented thin films of rigid‐rod, rigid‐rod pseudo‐ladder, and ladder polymers were ion‐bombarded with 84 Kr + to a dose of 4 × 10 16 ions/cm 2 . The bombardment was conducted at two conditions: one at 190 keV energy with 0.12 μA/cm 2 current density and the other at 200 keV energy with 2.0 μA/c…
Nd/sub 5/Fe/sub 17/ (also referred to as A/sub 2/-phase) is prepared by rapid-quenching and subsequent annealing. Due to the fine, homogeneous distribution of the elements in the melt-spun ribbons, only a short reaction time is required in the annealing treatment. The samples are almost single-phase, as revealed by X-…
The typification of Pleurosigma obscurum W. Smith is discussed with reference to material collected by W. Smith. The placing of the species in the genus Gyrosigma in recent publications is incorrect. All intact cells of this organism were collected in non-marine samples. Claims in the literature for a marine-brackish…
The depth profiles of activated boron concentration N B in the Al/p + -diamond Schottky diodes were systematically investigated from the junction capacitance-voltage ( C - V ) curves. The observed 1/ C 2 vs V plot did not fall on straight lines, indicating a nonuniform depth profile of N B . Using these C - V curves,…
The magnetization of a MnFeAs/sub y/P/sub 1-y/ system for y=0.275 and y=0.30 is measured under a static magnetic field up to 28 T at temperatures from 4.2 to 400 K. Field induced phase transitions are observed, and the critical points are found on (B, T) phase diagrams. In the case of y=0.275, the pressure measurement…
Many discussions of miscibility in polymer blends are based on the Gibbs free energy for a strictly-binary system, usually in the approximation of Flory,l hug gin^,^^^ and Staverman and Van Santen,4y5 which we call the FHS model.We find, by sample calculations described below, that the presence of polydispersity in on…
Abstract Mangetic bead cellulose was prepared from viscose and ferrite powder by employing the suspension procedure using the thermal sol‐gel transition. The particles thus obtained can be stirred if acted upon by an external rotary magnetic field of a common permanent magnet. Isolation of the particles from reaction…
The stress corrosion susceptibility of 25Cr–6Ni–3Mo duplex stainless steel (alloy 255, UNS S32550) in boiling 35% MgCl 2 solution has been examined in terms of the relationship between the critical cracking potential E cc for duplex stainless steel. Mill-annealed alloy 255 loaded to 90% of the yield strength in a boil…
Abstract This review article, supported by some original experimental results, explains the nature of the Cook‐Gordon (C‐G) mechanism of crack blunting. Examples are given of how the C‐G mechanism influences the toughness of several anisotropic materials: fibrillated polymeric films, composites based on oriented polym…
Shake-up lines associated with the ${\mathrm{Na}}^{+}$ [1s2p]3p atomiclike configurations in NaCl and several Na compounds have been identified in x-ray photoelectron spectra using commercial Al and Mg K\ensuremath{\alpha} sources. Two clearly separated peaks in a ratio of about 1:2 split by 4.4 eV and with a binding…
The addition of 2 at.% Ta or 1 at.% Ti into a (Nd,Dy)-(Fe,Co)-B alloy is very effective in improving room temperature coercivity and thermal stability. The Ta containing alloy shows 30% higher coercivity value than that of a Ta-free alloy at temperatures higher than 100 degrees C. Both Ta and Ti alloying greatly reduc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmmonia radio frequency plasma treatment of composite-filled poly(tetrafluoroethylene) and poly(tetrafluoroethylene) laminated to copperMebrahtu G. Fessehaie, Skye McClain, Carlos L. Barton, Gwo S. Swei, and Steven L. SuibCite this: Langmuir 1993, 9, 11, 3077–3084Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structural characterization, and reactivity of the (.eta.2-benzoato)iridium(III) hydride complex [mer-(Me3P)3Ir(.eta.2-O2CC6H5)(H)][PF6]Folami T. Ladipo and Joseph S. MerolaCite this: Inorg. Chem. 1993, 32, 23, 5201–5205Publication Date (Print):November 1, 1993Pub…
Analytical electron microscopy offers two main techniques of interest to materials science: electron energy-loss spectroscopy (EELS) and energy-dispersive x-ray analysis (EDX). The scientist is confronted with the choice of one of the two for the problem under consideration, although it is possible to employ both simu…
A new approach is presented for determining surface state parameters at semiconductor interfaces using time resolved surface photovoltage spectroscopy. The analysis provides precise determination of surface state energies, densities, occupancies, and cross sections for electrons and photons (including the wave-length…
A new six-dimensional Burgers vector of dislocations in Al–Cu–Fe and Al–Pd–Mn icosahedral quasicrystals has been determined to be 1/2〈11 – 200 – 2〉 by means of defocused convergent-beam electron diffraction. The component of the Burgers vector in the physical space is parallel to a twofold axis with a magnitude of 0·1…