Materials Literature
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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…
This paper describes the synthesis of various star-shaped polymers by means of complexation of bipyridyl-terminated polyoxyethylene with Ru(II) ion. Three kinds of bipyridyl-terminated polyoxyethylenes of different molecular weights were prepared from the corresponding polyoxyethylene monomethyl ethers with narrow mol…
The state of the art in research and application of processes of chemical vapour deposition of noble metal (Pt, Pd, Rh, Ir, Ru, Au) coatings is considered. Systematization of known experimental data on synthesis, thermal properties and saturated vapour pressure of volatile compounds of noble metals with organic ligand…
We show that the variation of the structural unit in tellurite glasses is due to the charge transfer from modifier atoms to ${\mathrm{TeO}}_{6}$ octahedra with use of first-principles molecular-orbital calculations. Mulliken overlap populations indicate that the oxygen coordination number of a Te atom reduces as the c…
The interaction of N-(p-methoxy-o-hydroxybenzylidene)-p-aminopyridine(I) and N-(p-methoxy-o-hydroxybenzylidene)-m-aminopyridine(II) with certain p-alkoxybenzoic acids results in the formation of liquid crystals. Specifically, as established by optical microscopy, DSC and X-ray diffraction studies, complexes of I with…
Based on the fact that the Al 3 Mn phase is closely related to the Al-Mn decagonal quasicrystal, three subunits of the Al-Mn decagonal quasicrystal are deduced from the structure of the Al 3 Mn phase. The existence of these subunits is confirmed by the high-resolution electron microscopy image of the Al-Mn decagonal q…
Abstract Hybrid biomaterials derived from a water‐soluble derivative of polypyrrole, poly(sodium 4‐(3‐pyrrolyl)butanesulfonate), and soluble collagen have been synthesized by chemical polymerization of the 4‐(3‐pyrrolyl)butanesulfonate monomer in a collagen solution. Interaction between the two polymers was evident in…
Existing colorimetric methods for determining phosphorus (P) in citrate‐bicarbonate‐dithionite (CBD) extracts from soils and sediments require pretreatments of extracts prior to the determination of the element. A method is proposed for the determination of P in CBD extracts without any chemical treatments. Maintainin…
Molecular dynamics simulations of the time-correlation functions that appear in the Green–Kubo expression for the shear viscosity are reported for liquid argon over a wide range of densities. The potential part of the microscopic stress tensor is separated into contributions due to the repulsive and attractive branche…
Abstract Conjugated polyanilines bearing long alkyl side chains (dodecyl PANi‐12 and octadecyl PANi‐18) were prepared for the purpose of obtaining well‐mixed conducting polymer blends with insulating flexible polymers. The miscibility of the polyanilines and ethylene‐ co ‐vinyl acetate copolymers (EV A20 with 20 wt %…
Electron microdiffraction experiments have been used to study a fine metastable precipitate (designated X) that forms as platelets on the [111]α planes of the alloy Al-2.5 wt% Cu-1.5 wt% Mg-0.5 wt%Ag, aged at 513 K. Microdiffraction patterns observed from individual platelets indicated that they have a hexagonal struc…