Materials Literature
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Adsorption of hard spherical particles onto a flat uniform surface is analyzed by using generalized random sequential adsorption (RSA) models. These models are defined by releasing the condition of immobility present in the usual RSA rules to allow for desorption or surface diffusion. Contrary to the simple RSA case,…
Ferroelectric materials show a spontaneous electrical polarization that can be reversed in sense by an applied external electric field. It should, therefore, be feasible to build a ferroelectric memory device that can store information in digital form. Early attempts to build such a memory have failed for various reas…
Similarities in the inhibition of crevice corrosion and pitting can be explained on the basis of competitive adsorption between inhibitive and aggressive ions. A mathematical model has been developed which takes into account competitive adsorption between aggressive ions (Cl − ) and inhibitive ions , with each ion ads…
Abstract Single-crystal Fourier-transform infrared (FTIR) spectra of Keokuk kaolinite and Ouray dickite were obtained with an FTIR microscope. Although numerous IR, FTIR, and Raman spectra of polycrystalline kaolinite and dickite can be found in the literature, the present data represent the first reported single-crys…
We give a comprehensive presentation of a renormalization-group theory for the study of a set of one-dimensional Schr\"odinger equations on quasicrystalline and hierarchical structures. Particular attention is focused on the spectral clustering and wave-function scaling properties. New results are given on (i) a gener…
Abstract A crystallization rate coefficient (CRC) parameter is introduced which has allowed a direct comparison of the crystallization rates of various polymers on a single scale for the first time. Basically, CRC represents a change in cooling rate required to bring about 1°C change in the supercooling of the polymer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear quadrupole interactions in copper(II)-diethylenetriamine-substituted imidazole complexes and in copper(II) proteinsFeng Jiang, John McCracken, and Jack PeisachCite this: J. Am. Chem. Soc. 1990, 112, 25, 9035–9044Publication Date (Print):December 1, 1990Publication Hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous colloidal dispersions of polyaniline formed by using poly(vinylpyridine)-based steric stabilizersS. P. Armes, M. Aldissi, S. Agnew, and S. GottesfeldCite this: Langmuir 1990, 6, 12, 1745–1749Publication Date (Print):December 1, 1990Publication History Published onlin…
Shape memory alloy hybrid composites have been shown both by analytical simulations and experiments to be effective adaptive materials for active vibration and structural acoustics control [Rogers and Robertshaw, Engineering Science Preprints 25, ESP25.88027, Society of Engineering Sciences (1988) and ASME Paper 88-WA…
Pure BaTiO 3 exhibits a paraelectric‐to‐ferroelectric phase transition at 130°C. When stoichiometric BaTiO 3 is combined with 10 mol% ZrO 2 , the relative permittivity (ε) changes to a broad, relatively insignificant temperature dependence, and the Curie point, T c , is not sharply defined. However, the transition sha…
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Polarized reflection and ESR measurements have been carried out on single crystals of newly synthesized halogen-bridged one-dimensional (1D) metal complexes {M(chxn${)}_{2}$Br}${\mathrm{Br}}_{2}$ (M=Pt, Pd, Ni; chxn=1R,2R-cyclohexanediamine), which have tight hydrogen bonds between ligands (chxn) and counter anions ($…
The dimers 1 can be prepared in 70% yield by Glaser coupling, if the reaction is carried out in the presence of 4,4′-bipyridine as template. With a tripyridyltriazine as template, formation of the corresponding trimer (52%) is favored. Without template the reaction is unselective: Dimer and trimer are formed together…
Higher multipole corrections to the dipole-approximation result for angular distributions of photoelectrons at low photon energies are discussed. The first-order corrections lead to a simplified formula for the angular distribution, which extends the dipole results for linearly, unpolarized, and partially polarized li…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA tetranuclear hydroxo-bridged copper(II) cluster of the cubane type. Preparation and structural and magnetic characterization of tetrakis[(2,2'-bipyridyl)hydroxocopper(II)] hexafluorophosphateJorunn Sletten, Astrid Soerensen, Miguel Julve, and Yves JournauxCite this: Inorg.…
Two quasiperiodic planar patterns with fivefold symmetry are derived from the root lattice A 4 in 4-space. A detailed analysis of the geometry of the A 4 Voronoi complex and its dual complex is presented with special emphasis on fivefold symmetry. By means of the general dualization method, 2D patterns are obtained, o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservation of strain-induced β form in poly(β-hydroxyalkanoates)W. J. Orts, R. H. Marchessault, T. L. Bluhm, and G. K. HamerCite this: Macromolecules 1990, 23, 26, 5368–5370Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inis…
Intrinsic defects have been produced in yttria- and calcia-stabilized zirconia (YSZ or CaSZ) single crystals either by x irradiation at 300 and 77 K or by thermochemical reduction at 1370, 1670, and 1870 K. The spectroscopic properties of the defects have been studied by electron paramagnetic resonance (EPR), optical…
Despite strong twisting of the conjugated system, the tetrathiafulvalene homologue 1 reacts with the electron acceptor tetracyanoquinonodimethane to give the dication 12⊕. The anthracene moiety is embedded in the 12⊕ [(TCNQ)4]2⊖, and the dithiol rings are twisted 86° with respect to the anthracene plane: The 1:4 stoic…
Domain boundaries (DB's) in convection patterns are studied near the onset of convection within the framework of amplitude equations of the Newell-Whitehead-Segel type. It is demonstrated that DB's of an arbitrary direction are possible between domains occupied by convection rolls with different orientations. Those DB…