Materials Literature
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Abstract Potential dependences of the Current and differential double‐layer capacity were used to investigate the processes that take place on a graphite electrode in acidic media containing 1, 5‐diphenylcarbazide (DPCI) and 1, 5‐diphenylcarbazide (DPCO). It is shown that adsorption of the enol form of these compounds…
Results of nonresonant and resonant Raman scattering from single crystals of ${\mathrm{Zn}}_{3}$${\mathrm{P}}_{2}$ are reported. When the exciting radiation energy is tuned well above the 1.5-eV fundamental absorption region, zone-center optical phonons are observed that are consistent with the tetragonal crystal stru…
ADVERTISEMENT RETURN TO ISSUEPREVArticleControlled synthesis and spectroscopic characterization of multifunctional hybrid silazane/silylamine preceramic telechelic oligomersKe Feng and Yitbarek H. MariamCite this: Macromolecules 1991, 24, 16, 4729–4732Publication Date (Print):August 1, 1991Publication History Publishe…
Abstract Ethylene‐vinyl alcohol (EVAL) copolymers and ethylene‐vinyl alcohol‐vinyl acetate (EVALVA) terpolymers with different VA content were achieved by hydrolysis of ethylene‐vinyl acetate (EVA) copolymers of low vinyl acetate content. Several experimental techniques (elemental analysis, thermogravimetry, NMR and I…
The axisymmetrical steady flow of an incompressible nematic liquid crystal around a sphere is studied on the basis of the Leslie-Ericksen equations. We assume low Reynolds numbers and a fixed director orientation parallel to the moving sphere (or the moving liquid crystal at infinite distance). The influence of the Le…
Article The crystal structure of rutile as a function of temperature up to 1600° C was published on August 1, 1991 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 194, issue 1-4).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic susceptibility, EPR, Moessbauer, and x-ray investigations of heteropolynuclear clusters containing iron(III) and copper(II) ions: {Cu(Mesalen)}2 Fe(acac) (NO3)2 and {Cu(Mesalen)}3 Fe(acac) (PF6)2Irene Morgenstern-Badarau, Daniel Laroque, Eckhard Bill, Heiner Winkler…
Abstract Successive temperature-programmed desorption (TPD) after temperature-programmed reduction (TPR) (Combined TPR-TPD) was performed in order to characterize supported platinum catalysts (Pt/SiO2, Pt/Al2O3, Pt/ZrO2 and Pt/TiO2) as well as to judge the validity of the apparent TPR profiles. In successive H2-TPD ru…
Summary This paper presents the results of laboratory investigations conducted to better our definition of the serviceability of bimetallic pipe manufactured by the thermohydraulic (tight-fit) method for Mobile Bay service. Both Alloy 625/API X-65 and Alloy 825/API X-65 tight-fit pipe (TFP) were evaluated under condit…
Heat-capacity measurements by adiabatic equilibrium calorimetry are reported for γ-phase Pr2S3, Tb2S3, and Dy2S3 between 5 and 350 K. Highly purified samples were prepared and their composition verified by chemical analysis. Precision lattice parameters were determined for each compound and are compared with literatur…
Under shear, nematic liquid crystals can exhibit localized excitations that propagate much faster than simple one-dimensional analysis can predict. We describe a two-dimensional theory in which the excitations are fronts between distinct solutions of the steady-state Ericksen-Leslie equations. We find that a front's s…
The change in energy related to the dissociation of a 1/2 〈1l0〉 screw dislocation into two Shockley partials or of an edge dislocation into the Lomer-Cottrell configuration has been recalculated. It is shown that the exact value, and even the sign, of this change cannot be found using linear isotropic elasticity when…
Abstract The adsorption of citrate, at 10 4 −10 −3 M initial concentration, by pseudoboehmite suspended in 0.02 M NaC1O 4 was investigated at varying pH. Citrate shows a strong affinity for the pseudoboehmite surface, as seen in the adsorption isotherm at pH 6. Adsorption envelopes of adsorbed citrate vs. pH for a giv…
Irradiation by red light at T ≲ 40 K induces the transition of the stable high‐spin state of 1 to a metastable low‐spin state, which, at T < 40 K, has a lifetime of days to weeks, The transition occurs via double intersystem crossing, 5 T 2 → 5 E → 3 T 1 → 1 A 1 . Compound 1 is only the second compound to show this…
Abstract A series of works with the aim of clarifying the mechanisms of thermal and photochemical degradation of PVC are reviewed. They include studies on: i) degradation of PVC samples of various tacticities; ii) degradation of PVC after modification by stereoselective nucleophilic substitution; iii) influence of tem…
The electronic-energy-straggling values for 50--250-keV ${\mathrm{H}}^{+}$ beams penetrating Cu, Ag, and Pt have been measured using backscattering. The Cu, Ag, and Pt layers with a thickness of about 30 nm were deposited onto Si, ${\mathrm{SiO}}_{2}$, ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$, and ${\mathrm{ZrO}}_{2}$ su…
Abstract New measurements of the heat capacity in the melt of poly(trimethylene succinate) (PTMS), poly(trimethylene adipate) (PTMA), and poly(hexamethylene sebacate) (PHMS) from 310 to 400 K are presented. Based on these data and literature data on eight other molten polylactones and poly(ethylene sebacate) (PES), an…
Abstract Changes in the fine structure of cellulose samples of different origin during treatment with sodium hydroxide in ethanol/water mixtures were studied. A computer program was written for peak separation and profile analysis. The presence of an amorphous phase was taken into account by adding a Gaussian type fun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShort synthesis of (.+-.)-5-(3-furyl)octahydro-8-methylindolizines, alkaloids related to a component of Castoreum. Use of radical cyclizationDerrick L. J. Clive and Raymond J. BergstraCite this: J. Org. Chem. 1991, 56, 16, 4976–4977Publication Date (Print):August 1, 1991Publ…
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