Materials Literature
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XPS spectra of graphite-filled poly(vinylidene fluoride) (PVdF) are presented. The specimen consists of 17 wt % PVdF and 83 wt % graphite. A freshly cut surface was examined using monochromated Al Kα x-rays. Spectra include a survey scan, C 1s and F 1s regions, and the F KLL Auger transitions.
Abstract New porous coordination polymer, {(H2dpds)2[V10O26(OH)2]·10H2O}n (H2dpds = bis(4-pyridinium) disulfide), was synthesized and structurally characterized. X-ray analysis demonstrates that the decavanadate anions are doubly bridged by H2dpds ligands to provide a one-dimensional structure. This network affords ch…
The ligand [3-(diphenylphosphino)propyl]-hepta[propyl]-[octasilsesquioxane] (dpps) can be prepared by reacting [3-chloropropyl]-hepta[propyl]-[octasilsesquioxane] (cs) with KP(Ph)2. The transition-metal complexes [Rh(CO)(dpps)2Cl], [Rh(COD)(dpps)Cl] and [Pt(dpps)2Cl2] are synthesized as models of functionalized sili…
This work investigated the weldability and mechanical properties of weldments made with Inconel filler metals I-52 and I-82 in the welding of Inconel alloy 690. Gas tungsten arc welding was used with different multipass sequences. The microstructures of the fusion and heat affected zones were examined and weldment pro…
Abstract Single crystals of the new compound Li 2 Co 3 (SeO 3 ) 4 have been synthesized under low-hydrothermal conditions. The structure was determined by direct methods from single crystal X-ray diffraction data (monoclinic, space group P 2 1 / c , a = 8.095(2) Å, b = 9.236(3) Å, c = 7.781(2) Å, β = 115.76(1)°, V = 5…
Nernst coefficient measurements of ${\mathrm{La}}_{0.88}{\mathrm{MnO}}_{3}$ (${T}_{c}\ensuremath{\sim}265$ K) are reported as a function of temperature (100--320 K) in moderate applied magnetic fields $(0.38<H<1.8$ T). For $T>{T}_{c},$ our data can be accounted for by the transport behavior of small polarons.…
The surface insulation resistance (SIR) test has traditionally been performed by taking measurements at certain points during a seven‐day test under well established environmental conditions. The work reported here explores the influence of test temperature and humidity when using a typical resin flux, a weak organic…
X-ray crystal structure analyses of the 4-(4-halobenzylideneamino)TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidyl-1-oxyl) radicals 4-(4-fluorobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl, 4-(4-chlorobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl, 4-(4-bromobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-o…
An inclusion complex of plumbagin with β-cyclodextrin was prepared with a view to increasing the aqueous solubility and stability of the drug. The drug complex and the free drug were entrapped in niosomes using a lipid layer hydration method with cholesterol, Span 60 and dicetyl phosphate. The niosomal entrapment effi…
The quasi-living cationic copolymerization of 3,3-bis(chloromethyl)oxetane (BCMO) and ε-caprolactone (ε-CL), using boron trifluoride etherate as catalyst and 1,4-butanediol as coinitiator, was investigated in methylene chloride at 0°C. The resulting hydroxyl-ended copolymers exhibit a narrow molecular weight polydispe…
A new compound in the Lys-HIO(3)-H(2)O system (where Lys = lysine), lysine-iodic acid (1/3), C(6)H(14)N(2)O(2).3HIO(3), has been discovered. Its crystals display nonlinear optical properties. They were investigated by X-ray analysis, IR spectroscopy and NQR methods. The parameters of the unit cell are a = 8.360 (2), b…
The barrier performance and properties (resistivity, crystalline phase and surface microroughness) of tantalum nitride films, as well as the relationship between grain size and diffusivity of copper films, are reported. The resistivity and R a roughness of Ta2N film formed by reactive sputtering using argon and nitrog…
Within the four-particle cluster approximation for the proton ordering model, we study effects of external pressures which do not lower the crystals symmetry on deuterated ferroelectrics and antiferroelectrics of ${\mathrm{KH}}_{2}{\mathrm{PO}}_{4} $ family. The theory provides a satisfactory description of the availa…
Blended organosilicon precursors containing 10 or 20% of poly(vinylsilane) (PVS) in polycarbosilane (PCS) were prepared and shaped into fiber form by melt‐spinning. The influence of PVS addition on the spinning, radiation‐curing, and pyrolysis processes was investigated. The addition of PVS increased the spinability o…
The chemical state of analyte species collected on a water-cooled silica tube during atom-trapping atomic absorption spectrometric determination is investigated with the use of X-ray photoelectron spectroscopy (XPS) for Bi and Mn. Analysis of the Bi 4f 7/2 peak reveals that the chemical state of Bi is +3 during initia…
The effect of additions of vanadium with simultaneous additions of other carbonitride forming microalloying elements (Ti, Nb, Zr) or Al on the hardenability of steels of composition Fe–0·4C–1·5Mn–(0·004–0·021)N (wt-%) was investigated. Using a thermodynamic model, the composition of the austenite and the amount of und…
We report on the alignment transition of a nematic liquid crystal from initially homeotropic to quasi-planar due to field-induced anchoring breaking. The initial homeotropic alignment is achieved by Langmuir-Blodgett monolayers. In this geometry the anchoring strength can be evaluated by the Frederiks transition techn…
Models for the interaction of uranium silicide dispersion fuels with an aluminum matrix, for the resultant reaction product swelling, and for the calculation of the stress gradient within the fuel particles are described within the context of DART fission-gas-induced swelling models. The effects of an aluminide shell…
The spin-lattice and spin-spin NMR relaxation times ${T}_{1}$ and ${T}_{2}$ of ${}^{55}\mathrm{Mn}$ and ${}^{139}\mathrm{La}$ were measured as a function of temperature in several $(\mathrm{LaNa}){\mathrm{MnO}}_{3}$ perovskites, which are ferromagnetic and exhibit metallic conductivity. Exponential dependence was obse…
Silver nanoclusters in poly(methyl methacrylate) (Ag/PMMA) were prepared by bulk polymerization of methyl methacrylate with radical initiators in the presence of silver(I) trifluoroacetate (AgTfa), followed by a period of heating. To compare the influence of the type of radical initiator on the formation of Ag nanoclu…