Materials Literature
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Tensile properties were investigated from room temperature to 673 K of a binary Mg–0.9 mass%Ca alloy where Mg2Ca phase was dispersed as lamella. The 0.2% proof stress significantly increased by the Mg2Ca phase in the temperature range investigated. It was suggested that strengthening by stable lamella Mg2Ca in the gra…
We created a model system made up of PU networks containing reactive surfactant additives in small amounts (<1%), brought in during the synthesis and able to reorient when changing the surrounding medium. The surfactants were made of fluorinated chains, sulfonamide kneecaps, and alkyl chains with a hydroxyl function a…
A series of meso-η1-platiniometalloporphyrins comprising DPP (= dianion of 5,15-diphenylporphyrin) and the first row transition metal ions Mn(III), Co(II), Ni(II) and Zn(II) has been prepared. The syntheses, spectroscopy and voltammetry as well as crystal structures of several of these derivatives are reported. The –P…
The extended use of Zircaloy cladding in light water reactors degrades its mechanical properties by a combination of irradiation embrittlement, coolant-side oxidation, hydrogen pickup, and hydride formation. The hydrides are usually concentrated in the form of a dense layer or rim near the cooler outer surface of the…
Two types of products were isolated from the reaction of NH4Se2P(OR)2 (R = Pr, Pri), Cu(CH3CN)4PF6, and Bu4NI in a 3 ∶ 2 ∶ 2 molar ratio in diethyl ether. The formulation of 1, Cu8(μ8-Se)[Se2P(OR)2]6, and 2, Cu11(μ9-Se)(μ3-I)3[Se2P(OR)2]6, was confirmed by elemental analyses, positive FAB mass spectrometry, multinucle…
A review of the current understanding of the effect of crystal lattice defects on the low-frequency dielectric relaxation properties in single crystals and polycrystalline polar dielectrics is given. Special attention is paid to different long-term phenomena, found in dielectric experiments, such as a low frequency re…
Fouling in crude oil preheat trains is a significant industrial problem which has restricted the application of process integration techniques such as "pinch technology" in this sector. A semiempirical fouling model for crude oil fouling developed by Panchal and co-workers allows the effects of fouling to be considere…
Electrodeposition of copper on activated carbon fabric was conducted in an attempt to promote the capacitance of the carbon fabric employed as electrodes in electrochemical capacitors using KOH solutions as the electrolyte. The deposition was conducted in for different lengths of time at a current density of and this…
The new non-stoichiometric mixed perovskite SrMn0.5Nb0.5O3−δ has a cubic double perovskite structure similar to that of Sr2CrNbO6 with space group Fmm (225), a = 7.9338(3) Å, V = 499.39(6) Å3 according to X-ray diffraction. The material is redox stable and maintains its structure in a reducing atmosphere. After reduci…
Carbon fibers are oxidized in two electrolytes at different electrolyte concentrations and potentials. The chemical composition of the fiber surface changes considerably in both cases. The oxidation in H2SO4 results in the formation of sulfur containing groups, but quinoidal compounds are also detected on the surface.…
Measurements of dielectric properties (a real part of dielectric permittivity and a dielectric loss tangent tan in the microwave range (0.5-2.5 GHz) at room temperature and at temperatures from room one up to 490 K at microwaves have been carried out in the BiFeO3-SrTiO3 system. Both and tan maximum values (sigma = 53…
ZnO quantum dots were prepared by the reaction of Zn2+ with OH— in alcoholic solution. By annealing (150–500 °C), both the particle size and the surface conditions could be changed intentionally. The structural properties of the dots were characterized by X-ray diffraction and Raman measurements, and the optical prope…
This work reports on the synthesis of tin and germanium phthalocyanine complexes containing phenoxy and substituted phenoxy groups as phthalocyanine ring substituents. The compounds studied are: dichlorogermanium phthalocyanine complexes containing eight phenoxy (4a), o-methyl phenoxy (4b) or estrone (4c) groups on th…
Pr 3 + -doped YF 3 , LiCaAlF 6 , and LiSrAlF 6 polycrystalline samples were prepared and investigated by means of high energetic excitation with synchrotron radiation. In the emission spectra, bands due to the intraconfigurational 1 S 0 → 4 f 2 transitions were observed. Simultaneously observed emission bands due to 4…
The book summarizes the history and current status of the development of gas turbine engines and ancillary equipment using ceramic hot section components. Specifically, the book focuses on the evolution of component and engine designs, and the demonstration of design concepts through rig and engine testing of the cera…
Emulsification of vegetable oil-based resins was a daunting task when the author began his research, but the subsequent technology spawned a generation of stable emulsions for waterborne coatings base
Abstract Nanocrystals of metals covered by alkanethiols organize themselves in two-dimensional arrays. We discuss such arrays of metal nanocrystals at length, with focus on the dependence of the structure and the stability of the arrays on the particle diameter and the distance between the particles. Three-dimensional…
Atomic force microscopy (AFM) was used to examine the surface structure of self-assembled films obtained from water-soluble chitosan rich solution precursor. The film was supported onto functionalized glass slides resulting in a mountain-and-valley structure. This feature is attributed as resulting of the experimental…
Stable icosahedral quasicrystals with wide composition ranges have been found in the systems Cd-Mg-Yb and Cd-Mg-Ca. The icosahedral quasicrystals form in the following composition ranges: 25-85at.%Cd, 0-60at.%Mg and 10-20at.%Yb for the Cd-Mg-Yb system; 33-85at.%Cd, 0-52at.%Mg and 10-20at.%Ca for the Cd-Mg-Ca system. A…
The X-band ( x ; 9.4 v GHz) electron spin resonance (ESR) spectra of the un-doped isotopically enriched lithium tetraborate (LTB) Li 2 B 4 O 7 single crystals, irradiated by thermal neutrons (fluences | n =2.74 ‐ 10 15 1 1.79 v ‐ 10 18 v cm m 2 ) were investigated at 300 and 77 v K. The LTB crystals of high chemical p…