Materials Literature
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Abstract The effects of crystallinity and spherulite size on the enzymatic degradation of microbial poly(3‐hydroxybutyrate) (PHB) films have been studied at 37°C and pH 7,4 in aqueous solutions of an extracellular PHB depolymerase from Alcaligenes faecalis T1. The rate of enzymatic degradation of PHB films decreases w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a series of monodisperse, 1,3,5-phenylene-based hydrocarbon dendrimers including C276H186 and their fluorinated analogsTimothy M. Miller, Thomas X. Neenan, Roberto Zayas, and Harvey E. BairCite this: J. Am. Chem. Soc. 1992, 114, 3, 1018–1025…
Part 1 Fundamentals: the 10 nm scale - structure elements of 2...20nm size linear response thermodynamics theoretical physics code. Part 2 Relaxation: three simple models glass transition - multiplicity in amorphous polymers thermal glass transition examples. Part 3 Thermodynamics: thermodynamics of mixtures compatabi…
Ferroelectric lead zirconate titanate (PZT) films with as much as 2.5 times the storage capacity of the best reported silicon oxide/nitride/oxide (ONO) stacked dielectrics have been fabricated. A 2000-AA film with an effective SiO/sub 2/ thickness of 10 AA is demonstrated. Because of the extremely high dielectric cons…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereocontrolled synthesis of disaccharides via the temporary silicon connectionGilbert Stork and Guncheol KimCite this: J. Am. Chem. Soc. 1992, 114, 3, 1087–1088Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January…
Plenary lecture the structure of glass novel glasses and processes relaxation phenomena high temperature studies and crystallization ionic-transport high silica glasses/sol-gel synthesis optical and electrical phenomena mechanical properties chemical interactions resonance phenomena.
Calcined hydrotalcites have been used extensively as catalysts for base-catalysed reactions. The calcination procedure in critical in determining the behaviour of the final material. The characteristics of the hydrotalcite, following the different stages of calcination, have been studied by means of thermogravimetric…
The outline of the Rietveld method is described where structure and lattice parameters are directly refined from powder diffraction data. Several functions such as extinction correction, preferred-orientation function, and profile-shape function, which are contained in the model function, have been improved to give ph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduced molybdenum phosphates: octahedral-tetrahedral framework solids with tunnels, cages, and microporesRobert C. Haushalter and Linda A. MundiCite this: Chem. Mater. 1992, 4, 1, 31–48Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Pub…
Description Materials information is a commercial resource comparable with the finance, plant and the workforce, and it needs management to be used efficiently. The nomenclature and data required to characterize materials and their properties are complex, which makes the need for standards for the exchange and use of…
Abstract The colors and color patterns of soils are widely used to infer other soil properties. It is desirable to understand, at least semiquantitatively, the effect various pigments have on soil color. The purpose of this study was to determine how hematite and goethite pigments influence soil color. We prepared sim…
We study the effects of hydrodynamic interactions on the diffusion of hard spheres in concentrated suspensions. Using a multiple-light-scattering technique, we measure [H(q)], a weighted average of H(q), a function that characterizes the hydrodynamic interaction. By changing the size of the spheres we probe the partic…
A review is presented of the state of the art of conducting polymers. Special attention is given to the high electrical conductivity of highly ordered doped polyacetylene, to the attempts to reproduce σ-values above 10 5 S/cm, and to efforts to correlate the electrical conductivity with other physical parameters (Euro…
The octaamino cryptand, L2, obtained by tetrahydroborate reduction of the [2 + 3] condensation product of tris(2-ethylamino)amine with terephthalaldehyde, acts as a host for pairs of protons or first-series transition-metal cations. An X-ray crystallographic structure determination of [H4L2]4+ reveals a pair of proton…
The distribution of extra-framework cations in zinc/sodium zeolite-Y has been determined by synchrotron X-ray powder diffraction using anomalous scattering methods.
- Particle and Lamella Interaction in Fluid Environments; - Colloidal Particles: Size and Mobility; - Rheology and Stability; - Colloidal Suspensions under Stress; - Surface Properties and Adsorption;
Water-stable, axial dialkoxy hypervalent phosphorus(V)tetraphenylporphyrins have been synthesised in a novel fashion by efficient substitution of axial chloride ligands of dichlorophosphorus(V)-tetraphenylporphyrin.
Book Review| July 01 1992 Fourth Ezra: A Commentary on the Book of Fourth Ezra Fourth Ezra: A Commentary on the Book of Fourth Ezra, Michael Edward Stone. Alden Thompson Alden Thompson Search for other works by this author on: This Site Google Journal of Biblical Literature (1992) 111 (2): 333–335. https://doi.org/10.…
Recent advances in materials technology has led to the development of new and improved optically nonlinear materials that can be used for a wide variety of applications ranging from deep UV conversion for laser fusion experiments to fast optical switching devices in future telecommunication systems. The processibility…
In 1962 Bienenstock and Ewald described a simple and systematic method for computing all the crystallographic space groups in Fourier space. Their approach is reformulated and further simplified, starting from the definition of the point group of a structure as the set of operations that take it into something indisti…