Materials Literature
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ABSTRACT Particle surface temperatures were measured by liquid crystals that allowed unrestricted motion of the monitored particles. Liquid‐particle film heat transfer coefficients (h p ) were considerably higher than published values which were determined with particles attached to thermocouple wires. In general, as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly(arylene sulfides) by cationic oxidative polymerization of diaryl disulfidesKimihisa Yamamoto, Mitsutoshi Jikei, Junya Katoh, Hiroyuki Nishide, and Eishun TsuchidaCite this: Macromolecules 1992, 25, 10, 2698–2704Publication Date (Print):May 1, 1992Publicatio…
Ninety-eight slides from eight lakes in the Adirondack Mountains of the northeastern United States have been distributed as an exsiccata to 16 museums and collections around the world. The slides were prepared from sediment cores representing microfloras dating from 1830 to 1983. Lake size varies from small ponds (1.0…
Results of in situ electron spin resonance, optical absorption, and Fourier transform infrared spectroscopic studies during electrochemical doping and undoping processes of viologen functionalized poly (3-alkylthiophenes) are reported. Effects of the functional group on the electronic properties of the polythiophene b…
Two new methods to synthesize macrocyclic β-keto lactones have been developed. The first involves the synthesis of ω-halo-β-keto esters and an intramolecular alkylation of the dianions to these compounds. The reaction is complicated by elimination in the small and medium ring systems and by difficulties in purifying t…
Abstract Novel μ-carboxylato-μ-hydroxo-bridged binuclear copper(II) complexes with 1,10-phenanthroline, [Cu2(OH)(RCOO)(phen)2]X2·H2O (where R = H, X = BF4 (1); R = CH3, X = NO3 (2); R = C2H5, X = NO3 (3)) were prepared and characterized by elemental analyses, electronic spectra, magnetic susceptibilities, and X-ray st…
The existence of polar electro-optic effect induced by a surface polarization of a nematic liquid crystal is proved using a simultaneous action of vertical dc and high-frequency ac electric fields on the homeotropically aligned nematic liquid crystal with positive dielectric anisotropy. The proposed method enables us…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic strategies in the formation of iron-modified polyimide filmsJoseph J. Bergmeister and Larry T. TaylorCite this: Chem. Mater. 1992, 4, 3, 729–737Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://pub…
Summary This paper describes a field-scale sensitivity study of the effect of the presence of oil on foam performance in a steam-foam-drive process. The 2D field-scale simulation was based on a field pilot in the Karamay formation in Xin-Jiang, China. Numerical results showed that the detrimental effect of oil on the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of isoxazole: experimental and modeling studyAssa Lifshitz and Dror WohlfeilerCite this: J. Phys. Chem. 1992, 96, 11, 4505–4515Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://pubs.acs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSquaraine chemistry. Design, synthesis and xerographic properties of a highly sensitive unsymmetrical fluorinated squaraineKock Yee LawCite this: Chem. Mater. 1992, 4, 3, 605–611Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published iniss…
Site-selective spectroscopy of rare-earth-doped materials has proven to be a powerful method for investigating solid-state defect chemistry at the atomic level. In this paper, the spectral transitions of single-crystal and polycrystalline samples of ${\mathrm{SrTiO}}_{3}$:${\mathrm{Eu}}^{3+}$ are sorted by site-select…
Ferroelectric liquid crystals (FLCs) have great potential in the future development of high‐resolution displays. A key requirements for their application is an understanding of the relationship between the molecular structure of the liquid crystals and their spontaneous polarization ( P 8 ) which in turn influences th…
Lithium aluminate (LiAl02) is one of the probable candidates for tritium breeding material because of its potential to give a fair tritium breeding ratio, stability at high temperature and stability in atmosphere containing water vapor. Clarification of the adsorption performances of water on LiAl02 is important for o…
The Ornstein-Zernike equation is used to analyze adsorption at, and the forces between, solutes and walls in near-critical fluids. The density profile is shown to decay exponentially with the bulk correlation length. The forces between solutes and between walls are also exponentially long ranged with the bulk correlat…
Piezoelectric PZT ceramics with the addition of 1.3–13.2 vol% ZrO2 were prepared. It was found that the addition of up to 8 vol% ZrO2 leads to higher values of flexural strength as compared to pure PZT, whereas the electric properties of the composites decrease with ZrO2 addition. Both phenomena are explained on the b…
Abstract The Yb(III) and Lu(III) sandwich complexes of 2,3,9,10,16,17,23,24-octabutoxyphthalocyanine (H2obPc) were prepared and characterized. Those electrochemical properties in CH2Cl2 were studied by means of cyclic voltammetry and absorption spectra in 320–1600 nm region monitored during controlled-potential electr…
Rhombohedral-type boron nitride (rBN) has been studied to pressures of 61 GPa at room temperature in a diamond-anvil cell by in situ x-ray diffraction. Synchrotron radiation was employed as an x-ray source. A precursory structural change occurs at \ensuremath{\sim}5 GPa. A transition to the cubic zinc-blende form (cBN…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrolysis chemistry of poly(organosilazanes) to silicon ceramicsHelen N. Han, David A. Lindquist, John S. Haggerty, and Dietmar SeyferthCite this: Chem. Mater. 1992, 4, 3, 705–711Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inis…
The technique of infrared emission spectroscopy (IRES) is reviewed and further examined in this study as a surface analysis tool. A system has been designed which allows simultaneous kinetic and in situ infrared emission analysis of catalyst surfaces. IRES spectra of several gas mixture/solid systems are obtained in o…