Materials Literature
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Results of the idealized mode-coupling theory for the structural relaxation in suspensions of hard-sphere colloidal particles are presented and discussed with regard to recent light scattering experiments. The structural relaxation becomes nondiffusive for long times, contrary to the expectation based on the de Gennes…
Polyaniline films are studied by using potentiodynamic experiments simultaneously with the electrochemical quartz crystal microbalance. The influence of the chemical nature of different anions on the electropolymerization of aniline is investigated. Also, the role of ionic transport during redox reactions is emphasize…
An important aspect of molecular fluids is the relation between orientation and translation parts of the two-particle correlations. Especially, a detailed knowledge of the influence of orientation correlations is needed to explain and calculate in detail the occurrence of a nematic phase. The simplest model system tha…
In this paper, we present the results of studies on the synthesis and properties of a series of liquid–crystalline lanthanide complexes of imine ligands. We describe the liquid–crystalline behaviour as a function of the metal, ligand and anion employed and we report on the nature of the coordination between different…
A stable phase of relatively large hexagonal-wurtzite silicon crystals (up to 20 μm) was directly deposited at low pressure using ultraviolet laser ablation. The films were grown on a variety of substrates at room temperature from a single crystal, cubic silicon target. Crystallites of the hexagonal-wurtzite phase of…
Surface enhanced Raman (SER) spectra were acquired continuously with time during the galvanostatic reductive dissolution of the passive film grown on iron in borate buffer (pH 8.4) by anodic polarization at one of three different potentials, +1000, +600, and 0 mV (SCE). Complementary measurements of the SER spectra of…
This paper presents a procedure to characterize deformation behavior applicable to various engineering materials in machining processes. Orthogonal machining tests are used to obtain the relationship between shear stress, strain, strain rate and temperature. Shear plane temperature is measured by an infrared thermal i…
The geometry, harmonic vibrational frequencies and stability of the structural isomers of small aluminum nitride clusters have been investigated using density functional theory. The lowest energy structures are cyclic. The cyclic structures have Dnh symmetry. The caged structure for Al4N4 lies higher in energy than th…
Knowledge of the composition and ecological preferences of diatom assemblages in northern regions is important for paleoenvironmental reconstructions of variables related to climate and/or anthropogenic disturbances. Relatively little is presently known about diatoms from circumpolar treeline areas, especially for lak…
We investigated the effect of characteristics of raw Al 2 O 3 powder on the synthesis of AlN by the carbothermal reduction‐nitridation method, in which CaF 2 was added as a catalytic material. Four types of Al 2 O 3 powders were selected. An Al 2 O 3 /C molar ratio of 0.29 was fixed, and the amount of CaF 2 was varied…
Abstract Highly dispersed titanium oxide catalysts have been prepared within the mesoporous cavities of the FSM-16 zeolite (Ti-oxide/FSM-16 catalyst) by a CVD method and utilized for the photocatalytic reduction of CO2 with H2O to produce CH4 and CH3OH at 328 K. These Ti-oxide/FSM-16 photocatalysts exhibited high reac…
A new strategy for encapsulating neutral nanoclusters is presented which employs surfactants with large concave headgroups and multiple contact sites. Au nanoclusters ranging from 3 to 20 nm in diameter were generated in the vapor phase and dispersed into dilute solutions of resorcinarenes 1 − 3, where they were stabi…
Molybdenum (Mo) doped vanadium dioxide thin films were synthesized using a Mo striped vanadium (V) target during pulsed laser ablation process. The film structure was characterized by high resolution x-ray diffraction, x-ray rocking curve and Rutherford backscattering/channeling measurements. The results show that the…
Polypropylene hybrid composites were made using coconut and glass fibers as reinforcing agents in the polypropylene matrix. The incorporation of both fibers into the PP matrix has resulted in the reduction of flex-ural, tensile, and impact strengths and elongation at break. The reduction has been attributed to the inc…
Tetragonal BaTiO 3 powders were prepared hydrothermally, using Ba(OH) 2 ·8H 2 O and TiO 2 (anatase), in the absence of anions such as chloride ions, at a temperature of 220°C for several days. Characterization via X‐ray diffractometry, scanning electron microscopy, and differential scanning calorimetry confirmed that…
We present large scale atomistic simulations of crack growth in iron under quasistatic loading in mode I. We show that long cracks display a brittle character of extension, while the growth of smaller cracks is accompanied by emission of partial dislocations from the crack tip and subsequent transformation of the stac…
Abstract Seeded batch experiments were conducted at low magma densities and moderate ionic strength to determine the growth and aggregation rate constants for calcite precipitation in a stirred vessel. The growth was found to be surface‐reaction‐limited, and the growth rates agreed broadly with other studies of calcit…
Fully dense disks, each consisting of a single crystal (111) plate of the relaxor‐based ferroelectric Pb(Mg 1/3 Nb 2/3 )O 3 ‐35 mol% PbTiO 3 (PMN‐35PT) embedded in a 0.48 ± 0.05 µm grain size polycrystalline matrix of the same composition, were formed by hot‐pressing at 950°C for 30 min under 20 MPa. Specimens were su…
The dibutyltin diacetate-catalyzed reaction of (tridecafluoro-1,1,2,2-tetrahydrooctyl)triethoxysilane (FTEOS) with dihydroxy-terminated poly(dimethylsiloxane), HO(Me 2 SiO) n H, has been used to prepare surface-modified siloxane networks. Surface characterization of these elastomers was carried out with electron spect…
Effects of the support environment on the existence of Cu ion pairs in Cu-exchanged ZSM-5 catalysts are examined using density functional theory. Results for the molecular and electronic structures of O- and O 2 -bridged Cu oxocations ([CuOCu] 2+ and [CuO 2 Cu] 2+ ) are presented, including two distinct isomers for th…