Materials Literature
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Abstract We applied the hard and soft acid-base (HSAB) model (Xu and Harsh 1990a, 1990b) to bivalent cation exchange on a purified Ca-montmorillonite. As a result, a satisfactory model is proposed to describe the gradual selectivity of exchange with Ca for 4 of the 6 metals studied (Cd, Cu, Pb, Zn). The selectivity is…
The inhibiting effect of cationic surfactant N, N, N‐dimethyl 4‐methylbenzyl dodecyl ammonium chloride on mild steel in hydrochloric acid solutions was investigated by surface and thermodynamic measurements, weight loss tests, polarization measurements and EDS techniques. The data obtained from surface and thermodynam…
X-ray photoemission measurements of Cu(OH)2 are presented.
A method to determine the surface azimuthal anchoring energy of a nematic liquid crystal is proposed. The technique implies the measurement of the director deviation on the cell substrate as a function of strength and direction of the applied magnetic field. As an example, the dependence of the azimuthal anchoring coe…
Abstract The equilibrium structures of cubic, tetragonal and orthorhombic phases of magnesium silicate perovskite are found from first principles electronic structure calculations. Zone centre and zone boundary phonons of each phase are also calculated from ab initio forces from finite displacments, and phase transiti…
The Nakamura‐Avrami method has been revised to derive reliable solutions for describing the kinetics of crystallization on heating with variable temperature. The corresponding numerical solutions for first‐order phase‐boundary‐controlled growth were computed to evaluate the errors that should be expected when using si…
Alkoxide‐derived boehmite precipitates were subjected to different post‐precipitation treatments to obtain a peptized sol, an unpeptized slurry, and an ethanol‐washed gel precipitate. These materials were dried further to obtain the corresponding gels. Changes in the surface area, porosity, and pore size with temperat…
Velocity profiles of the free surface of shock-loaded zinc crystals are measured in two different orientations. The test temperature is varied from room temperature to 410 °C. The results of the measurements show that the high-velocity deformation and fracture are athermal processes and that the fracture stresses are…
Polymer-like hydrogenated amorphous carbon (a-C:H) films have been grown in a dual-plasma [radio frequency (rf)–microwave (MW)] reactor using butane as a carbon precursor and different mixtures (H2–Ar or He–Ar) in the MW plasma in order to vary the atomic hydrogen flux impinging on the growing film. Decreasing the rf…
This study measures the x-ray-absorption spectra of a crystalline (c)-Si-C-N thin film at the C and Si K edge using the sample drain current mode and at the N K edge using the fluorescence mode. A resonance peak resembling the C 1s core exciton in the chemical-vapor-deposition-diamond/Si is observed. In addition, a br…
Though the bulk of research involving photocatalytic oxidation (PCO) of volatile organic compounds (VOCs) has involved the remediation of pollutants at high inlet concentrations, there has been some implication that PCO can be used to reduce exposure to low concentrations of VOCs and improve the quality of indoor air.…
Safe storage and handling of acrylic monomers assumes detailed knowledge about possible reactions and influence parameters on the radical polymerization. An investigation was made in order to predict the stability of the monomers by quantifying the oxygen consumption due to the inhibition process for different influen…
Cubic Y 6 WO 12 , which has a defect fluorite‐type structure with disordered cation and anion sublattices, was synthesized for the first time at the low temperature of 600°C by a polymerized complex method. The crystallization process of Y 6 WO 12 from an amorphous precursor has been investigated in detail using TG‐DT…
The application of shape memory alloy (SMA) thin films in optical devices is introduced and explored for the first time. Physical and optical properties of titanium-nickel (TiNi) SMA thin films change as these films undergo phase transformation on heating. An optical beam can be modulated either mechanically with a Ti…
The tripodal ligand tris[4-(2-hydroxy-3-methoxyphenyl)-3-aza-3-buten]amine (H3vantren) offers two coordination sites, an inner N4O3 one and an outer O6 one. Therefore, it can successively encapsulate two different metal ions, a 3d(III) ion in the N4O3 site, and a 4f(III) ion in the O6 site. This general route to homo-…
The micromechanical deformation behavior of transparent rubber-toughened poly(methylmethacrylate) (RTPMMA) was investigated by electron microscopy. With increasing volume fraction of particles (from 4 vol% to 35 vol%) RTPMMA showed a transition of deformation mode from brittle to ductile. In both cases the particles d…
The preparation of organic–inorganic polymer hybrids consisting of carbon–carbon and siloxane chains was investigated by radical polymerization of 3-methacryloxypropyltrimethoxysilane (MAS) followed by acid-catalyzed hydrolytic polycondensation. The condensation of poly(3-methacryloxypropyltrimethoxysilane) (S-PMA) of…
An experimental study on the thermal expansion of a collection of crosslinked low-density polyethylene (LDPE) foams with closed-cell structure is presented. The thermal characterization of these materials, the relationships between the linear thermal expansion coefficient and the structure of the foams, and the determ…
Abstract The structures of hexagonal μ -MgZnRE phases of Mg 28.3 Zn 65.2 Sm 6.5 and Mg 28.6 Zn 63.8 Gd 7.7 , were determined by single crystal X-ray structural analysis: μ MgZnSm, P 6 3 / mmc (No. 194), a = 14.619(1) Å, c = 8.708(1) Å, atoms/cell = 92, F (000) = 2484, μ = 27.44 mm −1 , D calc = 5.621 Mg m −3 , R = 0.0…
We present 14 examples of crystal structures that were originally described as triclinic, but are properly described as either C -centred monoclinic (ten examples) or rhombohedral (four examples). There is also one example each of changes from P 1 to P 1¯ and from Cc to C 2/ c .