Materials Literature
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Abstract Polyhydroxybutyrate (PHB) is a bacterially produced thermoplastic. Melt‐cast PHB sheets are usually quite brittle. We show that this brittleness is due to cracks within the spherulites. These cracks, which may be either radial or circumferential within the spherulites, depending on the crystallization tempera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConducting polymer solutionsJane E. FrommerCite this: Acc. Chem. Res. 1986, 19, 1, 2–9Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissue 1 January 1986https://pubs.acs.org/doi/10.1021/ar00121a001https://doi.org/10.1021/ar0…
The theory of the thermal conductivity of metals and alloys is reviewed. There are two components: electronic and lattice. The electronic component is related to the electrical conductivity by the Lorenz ratio. Deviations from the Sommerfeld value of the Lorentz ratio are discussed. At high temperature deviations are…
After a brief historical survey of cavitation and its deleterious effects, erosion and material response are considered from the point of view of stress field generation caused by cavitation collapse and the ensuing physical and chemical processes which contribute to erosion damage. The microstructural aspects of plas…
Abstract The literature abounds with the application of optimization methods for estimating model parameters in equation systems. The utility of these methods is frequently demonstrated on pathological examples using simulated data generated from a known model with a random error component and a known statistical dist…
The dependence of growth and photosythesis on cell size in diatoms is evaluated in terms of an energy-balance model of microalgal physiology. Based on a review of available observations it appears that cell size can account for much of the interspecific variability in maximum growth rate ( p, , , ) and in optical abso…
Interaction of benzene with boron trichloride at 800 °C yields a graphite-like metallic solid of composition BC3, and chlorine–pyridine mixtures at 800 °C give a nitrogen–carbon also having a graphite-like structure.
The oxidation of pyrrole by iron(III) chloride in aqueous solutions of methylcellulose yields colloidal solutions of conducting polypyrrole which can be used to prepare thin films with maximum conductivity of 0.2 S/cm.
This article describes the progress in experimental studies of liquid-crystalline blue phases during the past 5 years. Additionally, these results are compared critically with the predictions of theories of the blue phases. Areas considered in this review include (i) the thermodynamic stability of the three polymorphi…
Approche unifiee a l'algebre de la polarisation en utilisant les groupes unitaires speciaux SU(2) et SU(4) et leurs homomorphismes respectifs et les groupes orthogonaux reels O + (3) et O + (6)
Since 1935, various mechanisms have been suggested for the formation of subsurface lesions and, in particular, the surface layer covering enamel lesions. The relatively intact mineral-rich and porous surface layer is most likely caused by kinetic events. The suggested mineral-rich outer layer in sound enamel, the orga…
Biological mineralization processes are extremely diverse and, to date, it is an act of faith rather than an established principle that organisms utilize common mechanisms for forming crystals. A systematic analysis of the structural organization, as far as possible at the molecular level, of five different extracellu…
Abstract There is given a list of 323 taxa of freshwater diatoms occurring in waters of Central Europe. Each taxon is characterized by 10 balls of saprobic valence, the indicative weight of species (I i ) and by the individual saprobic index (S i ) indicating its position on a conventional scale of saprobity. Diatoms…
This book attempts to provide basic knowledge about the structure, properties, and processing of engineering materials and their applications. The first chapter gives an introduction to materials science and engineering and briefly describes the main types of engineering materials. Chapters 2 to 4 cover basic material…
Homopolymers and copolymers of 3-alkylthiophenes incorporating alkyl groups equal to or greater than butyl in size can be handled in solution and form highly conducting, environmentally-stable compositions on doping.
Tractable polythiophenes which are soluble in ordinary organic solvents at ambient temperatures are prepared by the electrochemical polymerization of thiophenes having a long alkyl chain.
The electrochemical oxidation of aromatic heterocyclic compounds thiophene, pyrrole, and indole and benzenoid and nonbenzenoid polycyclic hydrocarbons azulene, fluorene, and pyrene yield electrically conducting polymers with conductivities of 10 −5 –10 S/cm. The presence of substituents affects the electrical conducti…
ZSM-5 zeolites containing Cu2+ ions showed unusually high and steady state activity for the catalytic decomposition of nitrogen monoxide; for example, the degrees of conversions of NO, and of conversion into N2 and O2 were 97, 85, and 70%, respectively, at 823 K with a contact time of 10.0 g s cm–3 over 73% exchanged…
Various thermoelectric linear transport coefficients are defined and calculated for two reservoirs connected with ideal multichannel leads and a segment of an arbitrary disordered system. The reservoirs have different temperatures and chemical potentials. All of the inelastic scattering (and, thus, the dissipation) is…
Introduction. Basic theory. Antireflection coating. Neutral mirrors and beam splitters. Multilayer high-reflectance coatings. Edge filters. Band-pass filters. Tilted coatings. Production methods and thin-film materials. Factors affecting layer and coating properties. Layer uniformity and thickness monitoring. Specific…