Materials Literature
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Soluble phthalocyanines, including organo-soluble tetrakis(2,9,16,23-tert-butylphthalocyanines) ( M ( TBPc ), M = H 2 , Cu , Mg ; M ( TBPc ) 2 , M = Tb , Dy ) as well as the water-soluble sodium salt of sulfonated phthalocyanines (( MPc ( SO 3 Na ) 4 ), M = Cu , Zn , Mg ), and perylene tetracarboxylic derivatives (N,N…
The development of the microstructure in Mg-Al-Ca alloys was investigated both in the as-cast condition and after solution heat treatment at 415 °C for 0.25 -120 h, using secondary electron imaging, electron probe microanalysis and X-ray diffraction analysis in combination with light microscopy and image analysis. The…
Abstract For a vuleanized elastomer compound containing no filler, variation of dynamic moduli with strain was examined in the transition zone approaching glass transition at 0.1, 1, 10, and 15 Hz. In the complete absence of filler‐filler/filler‐polymer interactions, the nonlinearity in dynamic moduli becomes enhanced…
Electrically induced photoluminescence (PL) quenching from reverse-biased p+-type porous silicon (PS) and forward biased oxidized n-type PS, as well as their dynamics, have been investigated. The two systems exhibit common properties. The energy selectivity of the PL quenching by the applied potential is much lower th…
Abstract The title compound, a versatile and chemically stabilized oxidant, which is used technologically on a large scale, builds up an intercalation‐type of crystal structure with alternating sheets of sulfate and peroxomonosulfate anions, interspersed by the potassium cations. The sulfate ions are joined by a very…
The mechanism of hypervelocity impact crater formation in metallic and composite space debris shields has been investigated. Both normal and oblique impact crater formations have been investigated using 2.2-mm-thick aluminum (At 2017), carbon fiber reinforced plastic (CFRP) and aramid fiber reinforced plastic (AFRP) s…
Carbides and the matrix microstructure in high carbon hard facing weld metals reinforced with strong carbide forming elements were investigated by means of electron probe microanalysis (EPMA), energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM). The thermodynamics and the effect on the matr…
A systematic transmission electron microscopy (TEM) study was performed on the size distribution of antiphase domains in omphacite from eclogites from the Adula/Cima Lunga nappe. The measured mean antiphase domain size is shown to depend on peak temperature, duration of peak metamorphism, cooling rate, and composition…
To provide additional validation data for the multizone airflow and contaminant model, CONTAMW, experiments were performed in an occupied 3-story townhouse in Reston, VA. A tracer gas, sulfur hexaflouride (SF6), was manually injected within one room of the house and the concentration of SF6 was measured in each zone.…
The high‐temperature oxidation of SiC‐based structural ceramics is accelerated in the presence of KCl vapors. The corrosion products are primarily alkali silicates and the rate of attack is approximately proportional to the vapor pressure of KCl in the atmosphere. When both KCl and H 2 O are present in the oxidizing a…
In the automotive and aeronautic industries, security is of prime importance and so corrosion prevention is essential. Steel parts were once protected with deposits such as cadmium or zinc - nickel produced using a chromatation treatment but recent environmental directives dictate that these methods are no longer acce…
Frequency (10 Hz–1 MHz) and temperature (22–80 °C) dependent dielectric constant (both real and imaginary) of a ferroelectric liquid crystal ZLI-4851 film (21 μm thickness) showing a second order SmC*-SmA phase transition around 63.2 °C have been reported. The variation of dielectric constant as a function of temperat…
Thermal decomposition of TTIP was compared with oxidation of TiCl 4 in morphology and primary particle size of produced TiO 2 particles in a tubular reactor 2.7 cm in diameter and 54 cm in length under equal rate constants. The reactor temperature was varied from 850 to 1000°C for TiCl 4 oxidation and from 492 to 579°…
The magnetic properties of La 2−2 x Sr 1+2 x Mn 2 O 7 polycrystals ( x =0.3–0.4) are studied over a broad temperature range 80–600 K. Quasi-two-dimensional manganites have a complex magnetic structure that undergoes several transitions from one type of magnetic ordering to another. A specific feature of these manganit…
Abstract Fluoronyböite, ideally NaNa 2 (Al 2 Mg 3 )(Si 7 Al)O 22 F 2 , has been found in the Jianchang eclogite pod, Su-Lu coesite-eclogite province, China. It has been approved as a new mineral by the IMA. Single-crystal structure refinement and electron microprobe analysis were used for characterization: C 2/ m , wi…
The crystallisation of lead strontium titanate solid solution phase in glass ceramics in the [(Pb1 - xSrx)O.TiO2] - [2SiO2.B2O3]-[K2O]system (x = 0, 0·1, 0·2, 0·3, 0·4) has been studied. Perovskite titanate was found to be the major phase in all samples investigated. The actual composition of the crystallites develope…
A heteroepitaxial system of h-BN/monolayer graphene on Ni(111) has been investigated by means of vibrational spectroscopy, accompanied by low energy electron diffraction (LEED) and Auger electron spectroscopy (AES). The system was prepared in an epitaxial manner on a Ni(111) surface by chemical vapor deposition (CVD).…
This paper is concerned with bubble contraction in porous media otherwise filled with viscous fluid. We suppose that an external pressure is applied to the (fixed) boundary of a porous medium, forcing a bubble to contract towards a point. By using the Baiocchi transform, we are able to give a rather complete asymptoti…
Abstract Two polymer molecules of the same length ( n ) and the same number of branch points ( N ) can have different properties, since they may possess distinct architectures. In this paper we present a conditional Monte Carlo algorithm for the virtual synthesis of metallocene‐catalyzed polyethylene (PE) in a continu…
Room temperature powder infrared and Raman measurements for the new melaminium salt, bis(2,4,6-triamino-1,3,5-triazin-1-ium) sulfate dihydrate, 2C 3 H 7 N 6 + ·SO 4 2- ·2H 2 O, in the crystalline state, were carried out. The vibrational spectra in the region of internal vibrations of the ions corroborate recent X-ray…