Materials Literature
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The dielectric function of SiO2 films deposited by electron-beam evaporation on silicon substrates is determined by infrared ellipsometry between 700 and 5000 cm−1 one month after venting. Analysis of the absorption band associated with the Si–O–Si stretching mode at about 1075 cm−1 and of the water absorption band at…
We investigate the domain growth and phase separation of two-dimensional binary immiscible fluid systems using dissipative particle dynamics. Our results are compared with similar simulations using other techniques, and we conclude that dissipative particle dynamics is a promising method for simulating these systems.
The La3+ ion of a quantum paraelectric perovskite La1/2Na1/2TiO3 was substituted with the smaller tripositive lanthanide ions Ln3+. The X-ray structural study and Rietveld refinement of Ln1/2Na1/2TiO3 for Ln=Pr to Tb showed that they are synthesized as orthorhombic perovskite structure with the space group Pnma. Their…
Abstract The transport of moisture in shrinking food gels during drying is studied based on a novel thermomechanical theory accounting for a structural transition in the material—from the rubbery to the galssy state—during drying. The proposed theory is applied to the drying of a model cylindrical starch–gluten gel sy…
Piezoelectric effects in quasicrystals induced by both phonon and phason fields are investigated. Some characteristic features are predicted. Nonvanishing piezoelectric coefficients are deduced for two-dimensional quasicrystals with crystallographically allowable and forbidden symmetries as well as three-dimensional i…
Evaluation of Surface Complementarity, Hydrogen bonding, and Electrostatic interaction in molecular Recognition (ESCHER) is a new docking procedure consisting of three modules that work in series. The first module evaluates the geometric complementarity and produces a set of rough solutions for the docking problem. Th…
A systematic study of the efficiency of photoluminescence (PL) quenching of nanocrystalline porous Si by aromatic triplet energy acceptors was carried out. The effects of molecular triplet energy, molecular size, and the porous Si emission energy on PL quenching efficiency were probed. Photoluminescent porous Si sampl…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA New Type of Divalent Niobium Compound: The First Nb−Nb Triple Bond in a Tetragonal Lantern EnvironmentF. Albert Cotton, John H. Matonic, and Carlos A. MurilloView Author Information Laboratory for Molecular Structure and Bonding and Department of Chemistry, Texas A&M…
▪ Abstract Optimal design of the fiber-matrix interface in ceramic-matrix composites is the key to achieving desired composite performance. In this paper the interface-controlling parameters are described. Techniques for measuring interfacial properties are reported. Examples of interface design of both oxide and non-…
SAXS and TEM measurements are employed in order to study the morphology of poly(styrene)- block -poly(ethene- co- but-1-ene)- block -poly(styrene) (SEBS) with 29 wt % styrene (Kraton G1652) in bulk and at interfaces to different polymers. Temperature-dependent SAXS measurements of the SEBS bulk sample reveal that PS c…
Free-standing ultrathin films of a porphyrin homopolymer have been synthesized by interfacial polymerization of a mercaptoporphyrin. Coupling of 5,10,15,20-tetrakis(α-mercapto- p -tolyl)porphyrin at the water/chloroform interface by copper acetate yields continuous, flexible films after drying with supercritical CO 2…
Like many other prokaryotes, the photosynthetic bacterium Rhodobacter capsulatus produces high levels of polyhydroxyalkanoates (PHAs) when a suitable carbon source is available. The three genes that are traditionally considered to be necessary in the PHA biosynthetic pathway, phaA (beta-ketothiolase), phaB (acetoacety…
Successive ionic layer adsorption and reaction (SILAR) technique was used to deposit cadmium sulfide (CdS) and zinc sulfide (ZnS) thin films on (100)GaAs. CdS thin films were also grown on ITO-covered glass substrates. Multilayer CdS/ZnS thin films were deposited on glass substrates. The crystallinity of the thin film…
The lattice constant, density, electrical resistivity, activation energy, carrier concentration, mobility and Vickers hardness were studied on rare-earth-substituted nickel–zinc ferrites, with formula Ni0.7Zn0.3Fe1.98R0.02O4, where R = Yb, Er, Dy, Tb, Gd, Sm and Ce. We have found that all the rare-earth ions favor the…
Abstract: The impact damage resistance of Fibre Metal Laminates (FML) is studied. FML is a new family of laminated materials which consist of thin aluminium layers bonded together by intermediate fibrelepoxy layers. Different glass fibre FML variants are compared with A1 2024-T3, and carbodPEI composites. The effect o…
The gene encoding citrate synthase from a novel bacterial isolate (DS2-3R) from Antarctica has been cloned, sequenced and over expressed in Escherichia coli. Both the recombinant enzyme and the native enzyme, purified from DS2-3R, are cold-active, with a temperature optimum of 31 degrees C. In addition the enzymes are…
Abstract Mixtures of nematic 4-cyano-4′-pentylbiphenyl and (R)-2,2′-dihydroxy-1,1′-binaphthyl-condensed fulgide derivatives form stable cholesteric liquid crystalline states. Photochromic reactions of them induced the change of their cholesteric pitch reversibly.
Pyruvate kinase M1, a non-allosteric isozyme, was converted into an allosteric enzyme by replacement of an amino acid in the intersubunit contact. The substitution of Ala-398 with Arg resulted in the pronounced allosteric enzyme. The Hill coefficient and the substrate concentration giving one-half of Vmax for the muta…
Previous studies have shown that both polyester and polyether-based polyurea-urethanes are susceptible to cleavage by hydrolytic enzymes. Furthermore, it has been hypothesized that the degree of hard segment micro-domain formation in polyurethane materials, as well as its structure, influences the ability of enzymes t…
An experimental study is presented of the behavior of a molten contact line under conditions which simulate what happens when a molten droplet touches a subcooled solid, spreads partly over it, and freezes. We restrict our attention to the case where the solid and melt are of the same material and have approximately t…