Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoisomerization and thermal isomerization behavior of azobenzene derivatives in liquid-crystalline polymer matrixesTakeo Sasaki, Tomiki Ikeda, and Kunihiro IchimuraCite this: Macromolecules 1993, 26, 1, 151–154Publication Date (Print):January 1, 1993Publication History Pu…
Rapid-solidification experiments on metallic alloys in the last decade have provided widespread observations of a novel ``banded structure.'' We report the results of numerical and analytical studies of the interface dynamics underlying the formation of this structure in a model of directional solidification which inc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of toluene hydrogenation on a supported nickel catalystLars Peter Lindfors and Tapio SalmiCite this: Ind. Eng. Chem. Res. 1993, 32, 1, 34–42Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 1993https://…
Bright colors have been observed when a metal island film is deposited on top of a silver mirror with a separating quartz layer. For spacer layer thicknesses that are varied from 0 to 140 nm, the visual appearance changes from blue/black to a series of brilliant spectrumlike colors. The sequence is repeated similarly…
The origin, biological function, biochemical properties and cosmetic significance of the silk protein, sericin, are reviewed
Abstract Kaolin is an important industrial mineral and geological indicator. It occurs in hydrothermal, residual and sedimentary deposits. The first two are classed as primary occurrences and the third as secondary. The physical and chemical conditions under which kaolins form are at relatively low temperatures and pr…
The synthesis of 18 new macrocyclic complexing agents incorporating phosphinic acid (and carboxylic acid) groups is reported, based on the 1,4,7,10-tetraazacyclododecane ring. Through selective functionalisation of one ring nitrogen or by changing the nature of the P-substituent, anionic, neutral and cationic complexe…
Three new homologous series of mesogens containing three rings in the main structure and a lateral aromatic branch have been synthesized. When the lateral aromatic branch is attached to the middle ring, monotropic phases are observed, and there is a strong tendency to form the smectic C phase. When the lateral aromati…
The use of lattice energy minimization techniques to generate the structures of titanium dioxide polymorphs is demonstrated, given cell dimensions and contents without symmetry or geometry assumptions. The method yields the structures of rutile, anatase and brookite and, additionally, the TiO2(II) structure. Combined…
Solid solutions of the formula, A2–xLa2Ti3–xNbxO10(A = K, Rb), exist for the range 0⩽x⩽1.0, bridging n= 3 members of the Ruddlesden–Popper series (A2La2Ti3O10) and the Dion–Jacobson series (ALa2Ti2NbO10). For 0⩽x⩽0.75, the phases possess body-centred structures characteristic of the Ruddlesden–Popper phases, while the…
An adequate mathematical model of a three-phase power transformer is one of the important elements in the programs for the computer analysis of power system transients. Featured in this paper is the simulation model of a three-phase, three-limb core-type power transformer. Nonlinear effects of saturation, hysteresis a…
The EM plane-wave shielding properties of anisotropic laminated composites are analyzed, based on a model that treats each lamina as a homogeneous and anisotropic sheet and then uses a method that cascades the wave-transmission matrices in the computation, Numerical results are presented for graphite/epoxy laminates.…
A major light-harvesting complex (LHC) has been obtained from thylakoids of Amphidinium carterae solubilized with digitonin or decylmaltoside and separated by sucrose-gradient centrifugation. The digitonin-LHC forms a dark brown band at approximately 17% sucrose and the decylmaltoside LHC one at approximately 7% sucro…
Radio frequency plasma-deposited thin films offer an advantageous mechanism to alter the surface properties of biomaterials and medical devices without affecting the mechanical properties or primary fabrication. Such coatings are tightly adherent, conformal, and easily applied. They also exhibit excellent biocompatibi…
Microcreep deformations in pure copper specimens are studied by a new moiré method. In this method, a fine micrograting prepared by electron beam lithography is used as a model grating, and a scanning exposure ofthe primary electron beam in a scanning electron microscope (SEM) as a master grating. The scanning exposur…
The physical-mechanical properties of the enteric copolymers, poly(methacrylic acid, ethyl acrylate) Eudragit® L100-55, and Eudragit® L30D have been investigated. Free films of the copolymer containing varying levels of glyceryl triacetate (triacetin) and citrate ester (Citroflex®) plasticizers were prepared by both a…
Fourier-transform infrared photoacoustic spectroscopy (FTIR-PAS) is shown to be a useful tool for structural studies of hydrogen and/or oxygen chemisorption on the surface of diamond powders. As compared with the diffuse reflectance method or the KBr pellet method, it has become clear that PAS has an advantage in term…
The effects of plasticizers, triacetin and three different molecular weights of polyethylene glycol, on the water permeation and mechanical properties of cellulose acetate were investigated. At 37°C, the water permeability of cellulose acetate was found to decrease with increasing plasticizer to a minimum and then to…
Hydrogen-bonded dimers of 4-alkoxy-4′-stilbazole homologues (C n OSB, proton acceptors) and the mono-(2-methylbutyl)ester of terephthalic acid (MBTA, proton donor) behaved like conventional thermotropic mesogens. For chiral MBTA mixtures, chiral nematic and blue phases were observed with n = 1 and 2, and chiral smecti…
A remote plasma reactor, with air as the plasma gas, has been used for in-line surface modification of linear low-density polyethylene tape (LLDPE) passing 10 cm below the main plasma zone. Line speeds of up to 0.70 m/s were tested, allowing the study of 0.014 s exposure times to the plasma. Oxygen to carbon (O/C) rat…