Materials Literature
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Thermally stimulated discharge currents and time domain dielectric spectroscopy were employed to characterize the behavior of clay-filled ethylene propylene rubber. Measurements were made on samples with different clay concentrations and particle sizes. The main effect of the clay filler on the electrical properties i…
A simple, unified form of the fluorine-fluorine interionic potential is deduced from the modelization of many fluoroperovskites through a rigid-ion model. The Born-Mayer potential appears to be the most convenient description (${\mathit{V}}_{\mathrm{F}\mathrm{\ensuremath{-}}\mathrm{F}}$=\ensuremath{\lambda}${\mathit{e…
Abstract Crystals of Na 2 [Bi 2 Cu 3 O 4 (AsO 4 ) 2 ] · H 2 O and K 2 [Bi 2 Cu 3 O 4 (AsO 4 ) 2 ] · 2 H 2 O were synthesized under hydrothermal conditions at T ≤ 503 K. Their crystal structures were determined from single crystal X-ray data (Na 2 [Bi 2 Cu 3 O 4 (AsO 4 ) 2 ] · H 2 O: a = 9.716(1) Å, b = 5,203(1) Å, c =…
Abstract The Middle Proterozoic (1.1 Ga) Nonesuch Formation, host of the stratiform copper deposit at White Pine, Michigan, consists of 200 m of principally dark grey clastic sediments which contain detritus obtained dominantly from underlying mafic to intermediate volcanic rocks. Clay minerals from samples collected…
In situ real-time scanning tunneling microscopy is used to study Si etching in alkaline solutions modified by addition of Triton, a commonly used nonionic surfactant. On Si(111), time sequences of images, with the resolution of atomic steps, show that the rate of the nucleation of etch pits is decreased on terraces wh…
Crack propagation in an electrostrictive PMN-PT material under applied electric fields is studied using the Vickers indentation technique. It is observed that the applied electric field can enhance or inhibit crack propagation in the electrostrictive material depending on the orientation of the crack with respect to t…
X-ray photoelectron spectroscopy (XPS) has been used to study the interfacial chemistries of a 65-Å film prepared by depositing zirconium in an oxidizing environment onto a methane-pretreated 11-Å thick zirconium oxide film, which initially was deposited onto a gold substrate. The second metal deposition results in an…
A theoretical approach to the self-organization phenomena in irradiated crystals, which contain traps for vacancies and interstitials, is developed. In considered system two kinds of dissipative structure can arise. Temporal structures develop owing to release of energy in the processes of radiation-defect recombinati…
Abstract Five, ten, and twenty percent by weight blends of polysulfone in polycarbonate and polyetherimide in polycarbonate were produced by melt blending. The materials were injection molded into plaques. Mechanical analysis consisting of tensile, pendulum impact, and ballistic impact testing was conducted using the…
Partial reduction reactions in the NiAlO system, starting with the spinel compound NiAl2O4, are used to form metal-ceramic microstructures in situ. Two different morphologies of nearly pure Ni particles, equiaxed and rod-like, form within a ceramic matrix, which is either α-Al2O3 or a metastable ‘defect spinel’ depe…
The cratering and penetration behavior of annealed aluminum 1100 targets, with thickness varied from several centimeters to ultra-thin foils less than 1 micrometer thick, were experimentally investigated using 3.2 mm diameter spherical soda-lime glass projectiles at velocities from 1 to 7 km/s. The objective was to es…
The hydroxyl end-member ofhumite, Mg7Si3012(OH)2,was synthesized at 30 kbar and 940°C in the system MgO-SiOrH20 (MSH). Optical properties are nx = 1.6348(10), ny = 1.6397(10), nz = 1.6612(10), 2Vz = 56.1(2)°, -~n = 0.026. Results of single-crystal X-ray diffraction gave a = 4.78(2), b = 10.22(3), c = 21.02(9) A, V = 1…
Abstract A poly(methylphenylsilane) containing anthracene units in the polymer backbone was synthesized by the Wrutz-type reaction of 9,10-bis(methylpropylchlorosilyl)anthracene and methylphenyldichlorosilane. This polymer exhibited light blue photoluminescence with 87% quantum efficiency. The excitation spectrum sugg…
The spreading of a thin, planar drop of fluid that completely wets a solid surface is described, from an initial state in which the drop has a compact shape through its final approach to an infinitesimally thin film extending to infinity. Because the slope of the drop surface is everywhere small, the lubrication appro…
Data analysis of the compression of a fabric can only be done using a mathematical model to smooth the results. The best formula is Van Wyk's, although the meaning of the physical parameters is very difficult to define for a fabric. On the basis of Van Wyck's equation, a study of the compressibility of a fabric whose…
An inflation rule is given which proves the existence of infinite decagonal rectangle-triangle tilings. Such tilings correspond to the maximum possible density of a decagonal disc packing and can be used to model decagonal quasicrystals. A lower bound 0.0336 per vertex is found for the entropy density of the correspon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReductive Polycondensation. Synthesis of Polyethers Consisting of One Unit from Dialdehydes and of Polyethers Consisting of Two Alternating Units from Dialdehydes and Alkylene Bis(trimethylsilyl) Ethers1Tsutomu Yokozawa and Fumitoshi NakamuraCite this: Macromolecules 1995, 2…
The science and technology of chromogenic materials for switchable glazings in building applications is discussed. These glazings can be used for dynamic control of solar and visible energy. Currently many researchers and engineers are involved with the development of products in this field. A summary of activities in…
Abstract Using chemical transport reactions well-shaped crystals of In 2 (SO 4 ) 3 and Ga 2 (SO 4 ) 3 can be prepared in a temperature gradient ( T 2 → T 1 ) using Cl 2 as transport agent. The two modifications of In 2 (SO 4 ) 3 were formed by variation of the transport temperature. The low-temperature modification of…
Distinct improvement in adhesion of diamond coatings on hard metal substrates was achieved by following substrate surface pretreatment [1] : First WC was removed from the substrate surface by etching with Murakami solution (K3[Fe(CN)6] in KOH), after which the Co binder network was etched with H2SO4/H2O2 solution. The…