Materials Literature
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An interrupted field time-of-flight (IFTOF) technique that enables displacement-current-free measurement of the photocurrent in the conventional transient photoconductivity experiment is described and implemented. During the drift of the photoinjected charge carriers across the sample, the applied field is removed at…
Colloidal dispersions of polymer-protected Pd/Pt and Pd/Au bimetallic clusters were prepared by reduction of an alcoholic solution of PdCl2 and H2PtCl6 or HAuCl4 in the presence of poly(N-vinyl-2-pyrrolidone). The reduction can be carried out by refluxing in alcohol or by irradiation with visible light. The dispersion…
Experimental methods are presented for the determination of fracture initiation toughness of ceramics and ceramic composites in pure tension under quasi‐static and dynamic loading conditions over a range of temperature spanning 20° to 1300°C. Circumferentially notched and cyclic fatigue precracked rods of a variety of…
Small unilamellar liposomes that contain the lipophilic chelate DTPA-stearate (DTPASA) were used as carriers for the paramagnetic metal ions gadolinium, manganese, and iron. The iron liposomes were unstable in vitro and thus not studied further. The natural targeting properties of these liposomes to the reticuloendoth…
Residual strains and stresses were determined in hot‐pressed α‐Al 2 O 3 composites containing 29, 18, and 10 vol%β‐SiC whiskers using X‐ray diffraction. A 29 vol% SiC hot‐pressed specimen containing whiskers coated with a 5‐ to 10‐nm‐thick carbon film was also investigated. Strains were determined from the 511 and 333…
Summary Published parachor-correlation predictions diverge for high-molecular-weight (MW) components. This divergence stems from a lack of data. This paper incorporates parachor measurements for high-MW mixtures that have not been used in the preparation of previously published parachor correlations into new parachor…
A numerical approach based on the boundary-element method (BEM) is described for the analysis of plane-wave diffraction from groove-type gratings. First, the diffraction problem is exactly analyzed as a two-medium boundary-value problem. Further, for metallic gratings, a simple method in which an approximate boundary…
The model developed in Part 1 for the solidification and convection that occurs when an alloy is cooled from above is extended to investigate the role of disequilibrium at the mush–liquid interface. Small departures from equilibrium are important because in a convecting system an interfacial temperature below its equi…
Two amino acid residues, His274 and Asp375, were replaced singly in the active site of pig citrate synthase (PCS) with Gly274, Arg274, Gly375, Asn375, Glu375, and Gln375. The nonmutant protein and the mutant proteins were expressed in and purified from Escherichia coli, and the effects of these amino acid substitution…
A numerical simulation approach is used to investigate various aspects of dynamic metal powder consolidation. A two-dimensional continuum model is employed where only a few powder particles, and the interparticle voids, are considered. Consolidation is achieved by introducing large compressive stress waves in type 304…
Abstract Binuclear complexes, [Cu(L)Cu(L′)(H2O)2]X2 (H2L=3,3′-trimethylenedinitrilobis(2-butanoneoxime) (H2dopn) or 3,3′-ethylenedinitrilobis(2-butanoneoxime) (H2doen); L′=2,2′-bipyridyl (bpy) or 1,10-phenanthroline (phen); X=ClO4 or NO3), [Ni(dopn)Cu(bpy)(H2O)](ClO4)2, and [Ni(dopn)Ni(bpy)2](ClO4)2, have been prepare…
An alternative method, based on dielectric measurements on thick samples, for determining the Goldstone-mode rotational viscosity and the twist elastic constant of ferroelectric, chiral smectic-${\mathit{C}}^{\mathrm{*}}$ liquid crystals is presented. By the use of this method the temperature dependence of these quant…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemically induced isothermal phase transition in polymer liquid crystals with mesogenic cyanobiphenyl side chainsTomiki Ikeda, Seiji Kurihara, Durga B. Karanjit, and Shigeo TazukeCite this: Macromolecules 1990, 23, 17, 3938–3943Publication Date (Print):August 1, 1990Pu…
Molecular nano‐composites of two electrically active but chemically deverse components, organic conducting polymers and inorganic metaloxide bronzes, can be formed by the in situ intercalative oxidative polymerization of aniline in FeOCl. Two forms of the normally amorphous polyaniline, in a cryustalline, well‐defined…
A Schiff's base ferroelectric liquid-crystal P-hexyloxybenzylidene-p'-amino-2-chloro-\ensuremath{\alpha}-propyle-cinnamate was spread on water to create a monomolecular film. Lateral compression led to several collapses at areas in the relation 1:1/2: 1) / 3 , etc. suggesting that smectic layers had been formed. The t…
A novel electrochromic device utilizing a single film of Prussian blue is described, and its optical switching behavior is characterized. Light transmission through the device can be increased by the application of 2–12V across the film; the larger voltages bleach more of the Prussian blue up to a maximum of about 50%…
Spherical, submicrometer particles of zinc sulfide were homogeneously precipitated by thermal decomposition of thioacetamide in acidic aqueous solutions. The rate of sulfide ion generation, determined by various combinations of temperature, PH, and initial concentrations of zinc ions and of thioacetamide, as related t…
Diamondlike a-C:H films have been deposited by decomposition of C2H2. By the combination of Brillouin scattering and the ultralow load indentation technique, the following mechanical properties of the films were studied: the microhardness H, the Young’s modulus E, the shear modulus μ, and the Poisson’s ratio ν. From t…
Abstract Samples of mixed-layer illite/smectite were investigated from a single bentonite bed zoned with respect to expandability from 90 to 30%. Chips of natural rocks were embedded in a resin, using a procedure designed to preserve the original fabric, cut with an ultramicrotome, and observed by high-resolution tran…
Quantum-confinement-induced shifts in the fundamental absorption edge of isolated CdTe crystallites are reported in CdTe-glass composite thin films produced using a sequential rf magnetron sputtering process employing two separate sputtering sources. Films ranging in thickness from 0.5 to 4.5 μm and containing as much…