Materials Literature
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The surface of a carbonyl iron powder was chemically modified with functional triethoxysilanes and ethyl n -alkylphosphonates. The grafted layers were examined by x-ray photoelectron spectroscopy and conductivity measurements.
A constrained derivative of Gd-PCTA12, Gd-cyclo-PCTA12, in which one ethylene bridge connecting two nitrogen atoms of the triamine block is replaced by a cyclohexylene bridge, was synthesized and the impact of rigidification was studied by comparing the physicochemical and relaxometric properties of both gadolinium MR…
ABSTRACT: The overall research objective was to investigate the effects of wax application to casein films on the physical, morphological, mechanical, and water barrier properties of the films. Casein films were prepared by cross‐linking with zein hydrolysate using transglutaminase. Wax was either incorporated into th…
Diamond has a unique combination of physical properties for the inertial confinement fusion ablator application, such as appropriate optical properties, high atomic density, high yield strength, and high thermal conductivity. Here, we present a feasible concept for fabrication of diamond ablator shells. The fabricatio…
Elastic constants and their temperature derivatives of orthorhombic 2/1‐mullite single crystals were determined using resonant ultrasound spectroscopy between ambient temperature and 1400°C in air. The values at room temperature given in GPa were c 11 =279.5(4), c 22 =234.9(2), c 33 =360.6(3), c 44 =109.49(7), c 55 =7…
Polycrystalline samples of Sr8GaxGe46−x clathrates with varied nominal Ga contents were prepared by powder metallurgy to produce n-type samples with carrier concentration n of 1.8×1020–1.1×1021cm−3. Their thermoelectric properties were measured in the temperature range from 300to900K. Their Seebeck coefficient and ele…
Abstract The solid state structures of three nitroformate (NF) salts were determined using single crystal X‐ray crystallography. The NF anion was found to be a non‐planar moiety which adopts either the commonly observed C 2v conformation or distorted propeller conformation ( D 3 ) in the case of the silver salts, or,…
The temperature dependences of phase-change random access memory (PCRAM) cells on different Ge–Sb–Te phase-change recording materials are studied and compared. A Ge 2 Sb 2 Te 5 phase-change film has a larger resistance margin and a higher thermal stability than Ge 1 Sb 2 Te 4 and Ge 1 Sb 4 Te 7 films. The set resistan…
Pyrochlore-group minerals that exhibit high Si contents are fairly common in geochemically evolved parageneses. However, the role of Si in the structure of these minerals is unclear. Different explanations have been invoked to clarify the way in which Si is incorporated in natural pyrochlores. These include the presen…
The local structure of syndiotactic poly(methyl methacrylate) (PMMA) has been investigated by combining neutron scattering and fully atomistic molecular dynamics simulations. Selectively deuterating parts of the PMMA monomer, we have accessed five different partial structure factors in the glassy state by neutrons, an…
[reaction: see text] This paper describes the selective formation of a cyclic tetramer from a readily synthesized metalloporphyrin with two self-complementary quadruple hydrogen-bonding units. The extremely strong quadruple hydrogen-bonding unit, 2-ureido-4[1H]-pyrimidinone, enabled the formation of a stable cyclic te…
Composite ZnSnO3 nanowires are synthesized via a one-step thermal evaporation method. The nanowires are of core-shell structures with the presence of grain boundary and out-of-phase boundaries. Transport through individual nanowires shows nonlinear current-voltage (I-V) characteristics in the range of the voltage from…
As an attempt to contribute to the understanding of the corrosion process of steel by hydrogen sulfide (H2S), the corrosion behavior of an X70 pipeline steel immersed in several H2S-containing solutions is analyzed in this work. Linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) tech…
A unique type of carbon nanotubes with 2 to 5 layers of sidewalls and diameters less than 10 nm was synthesized by the thermal chemical vapor deposition (CVD) method with MgO supported Fe/Mo catalyst. Unlike the typical CVD grown multi-walled carbon nanotubes, these few-walled carbon nanotubes (FWNTs) have a high degr…
We grew single crystals of partially Bi-substituted Ca 3 Co 4 O 9 phase in a solution consisting of K 2 CO 3 –KCl solvent. All the X-ray diffraction patterns of the single crystals with different Bi contents were attributable to the Ca 3 Co 4 O 9 structure, although weak diffraction peaks from a secondary phase of Bi…
Experimental data on the effect of grain sizes on the shape and width of the hysteresis loop characterizing a metal-semiconductor phase transition in vanadium dioxide films are analyzed in terms of the classical theory of nucleation. It is shown that the factors responsible for the changes in the shape and width of th…
In this paper, we report on the heat capacities cp of bulk polycrystalline samples of Ti2AlC, V2AlC, and Cr2AlC in the 3–260K temperature range. Given the structural and chemical similarities of these compounds it is not surprising that the cp’s and their temperature dependencies were quite similar. Nevertheless, at a…
In the aim to decrease the degradation rate of magnesium in simulated body fluid, pure magnesium was treated by two different routes, i) by soaking specimens in an HF aqueous solution at 30oC for 30 min and ii) by heating specimens at 345oC for 15 min. The treated samples were immersed in simulated body fluid (SBF) at…
Hoodia gordonii is traditionally used in South Africa for its appetite suppressant properties. P57AS3 (P57), an oxypregnane steroidal glycoside, is the only reported active constituent from this plant as an appetite suppressant. Effective quality control of these extracts or products requires rapid methods to determin…
We report a detailed study on the design of carbon nanotube based microfocus x-ray tube with one electrostatic focusing electrode. Based on the electron optics simulations, such parameters as geometrical distances and applied voltages among all the electrodes are considered, respectively, in relation to the size of x-…