Materials Literature
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Research News: The pores in a microporous membrane can act as templates for the synthesis of polymeric and metallic microtubules. The tubules thus produced (see Figure) have monodispersed diameters and lengths and potential applications ranging from drug‐delivery systems to microwave components and in electronic and o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination oligomers and a coordination polymer of zinc tetraarylporphyrinsEverly B. Fleischer and Amy M. ShachterCite this: Inorg. Chem. 1991, 30, 19, 3763–3769Publication Date (Print):September 18, 1991Publication History Published online1 May 2002Published inissue 18 Se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular second-order optical nonlinearities of metallocenesJoseph C. Calabrese, Lap Tak Cheng, Jennifer C. Green, Seth R. Marder, and Wilson TamCite this: J. Am. Chem. Soc. 1991, 113, 19, 7227–7232Publication Date (Print):September 1, 1991Publication History Published onli…
The addition of a tertiary radical to an electron-deficient alkene proves to be the decisve step in the synthesis of the four-directional cascade polymers 1 and 2, which have no heteroatoms in the initial core, in the branching centers, or in the repeat units. Only the periphery is highly fuctionalized.
An efficient procedure for calculating the contribution of the thermal diffuse scattering to the absorptive form factor is outlined. For an isotropic Einstein model all integrations could be performed analytically by using suitable functions to fit the elastic electron scattering amplitudes. The result is cast into a…
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Steel in contact with fresh concrete is covered by a layer of passivating oxydes due to the alkaline nature of the pore solution. The presence of oxygen plays an important role in this passivation process as well as in the corrosión one when is developped due to the ingress of aggressives, such as, chloride ions. In t…
The object of this study is the characterization of several sized fractions from a "spanish fly ash" originating in the thermoelectric power plant in Andorra (Teruel). Physical (size distributions, densities) chemical (chemical composition) and mineralogical characteristics (X-ray diffractograms and infrared spectra)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThird-order optical nonlinearities and their wavelength dispersion in thin films of conjugated rigid-rod polyquinolines and a random copolymerAshwini K. Agrawal, Samson A. Jenekhe, Herman Vanherzeele, and Jeffrey S. MethCite this: Chem. Mater. 1991, 3, 5, 765–768Publication…
Five types of stone used in Andalusian Cathedrals have been treated with different water-repellent treatments, to evaluate the effects of this products. The stones studied are limestone, calcarenite and dolomite; the products applied are organosilicones and acrylics. In this work properties related with water access a…
The technologically important viscoelastic structural properties of glasses are largely determined at the glass transition, where the supercooled liquid falls out of equilibrium. We examine recent experimental evidence that there is a thermodynamic critical point underlying this transition. We argue that the behavior…
It is shown that the sum of the intensities for magnetic dipole transitions between crystal-field components of two free-ion levels in lanthanide spectra is almost independent of the symmetry of the environment. A mean theoretical sum value of 18×10−7𝒟2, 94×10−7𝒟2, and 9×10−7𝒟2 for, respectively, the 5D1←7F0, 5D0←7F1,…
Electrical properties and microstructures of a holmium-doped (Ba 1.01 Mg 0.01 )O 1.02 (Ti 0.98 Zr 0.02 )O 2 system were studied. Additions of Ho 2 O 3 had little effect in preventing the dielectrics from reducing at high temperature, but the resistivity at low temperature increased with increasing amount of Ho 2 O 3 w…
A mathematical analysis is carried out for the Cahn–Hilliard equation where the free energy takes the form of a double well potential function with infinite walls. Existence and uniqueness are proved for a weak formulation of the problem which possesses a Lyapunov functional. Regularity results are presented for the w…
The most comprehensive collection of time-temperature diagrams for irons and steels ever collected. Between this volume and its companion, Atlas of Time Temperature Diagrams for Nonferrous Alloys, you'll find the most comprehensive collection of time-temperature diagrams ever collected. Containing both commonly used c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConjugated aromatic poly(azomethines). 1. Characterization of structure, electronic spectra, and processing of thin films from soluble complexesChen Jen Yang and Samson A. JenekheCite this: Chem. Mater. 1991, 3, 5, 878–887Publication Date (Print):September 1, 1991Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereocomplex formation between enantiomeric poly(lactic acid)s. 4. Differential scanning calorimetric studies on precipitates from mixed solutions of poly(D-lactic acid) and poly(L-lactic acid)Hideto Tsuji, Suong Hyu Hyon, and Yoshito IkadaCite this: Macromolecules 1991, 24…
Air-filled microbubbles are in clinical use as echo-contrast agents for sonographic applications. The synthesis of aqueous suspensions of air-filled proteinaceous microbubbles involves the ultrasonic irradiation of aqueous protein solutions in the presence of O2. Yields and size distributions of human and bovine serum…