Materials Literature
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The in vitro degradation of glycine-DL-lactic acid copolymers was studied as a function of the composition. These polydepsipeptides were prepared by ring-opening copolymerization of 6-methyl-2,5-morpholinedione and DL-lactide. The degradation of discs of the copolymers was performed in a phosphate buffer at pH 7.4 and…
Abstract The surface charges and the zeta potential of a Na-montmorillonite (Na-mont) and two pillared montmorillonite (MP1 and MP2) samples with different aluminum contents were determined by Potentiometric titrations and electrophoretic measurements. At pH >9 the two pillared montmorillonite samples showed zeta p…
This study was part of an overall effort to explore the feasibility of using psycho physical methods to assess one component of sensorial comfort, moisture sensation in clothing, We have used a psychophysical approach to assess the relationship between moisture stimulus intensity and moisture sensation in subjects for…
Diamond particles 10–500 nm in diameter were produced by microwave-assisted combustion of acetylene in oxygen. Both premixed and diffusion flame configurations were investigated. A mixture of cubic and hexagonal polytypes of diamond were identified. Larger particle sizes were observed at lower reactor pressure and hig…
Abstract The photelectron spectra of five different liquid silanes were measured. Their C 1s spectra and measured compositions were all consistent with the theoretical formula of these compounds. Subsequently, E‐glass fibers were exposed to dilute aqueous solutions of these silanes, and their adsorption on the fiber s…
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…