Materials Literature
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We present a theory of epitaxial growth appropriate to overlayer materials that can adopt a bulk metastable crystal structure with a lattice constant significantly different from that of the stable ground state structure, as is common for metal epitaxy. This requires a generalization of the traditional Frank and van d…
Proton-exchanged K4Nb6O17 showed high activity for H2 evolution from aqueous methanol solution without any assistance from other materials such as noble metals.
A Van der Waals fluid, climbing from a reservoir along a vertical wall, should display a remarkable cascade of events : i) A macroscopic meniscus is set up in a short time t1 and reaches the classical altitude hc∼ 1 mm. ii) A dynamic precursor film appears at a time t2 ∼ 10-2 s. The tip of the « tongue» advances fast…
Moving dislocations in II–VI semiconductors carry a large electric charge. This charge is not in thermal equilibrium, but is due to the sweeping up of electrons from point defects. Its movement produces a dislocation current during plastic deformation, and conversely, the application of an external field changes the f…
The effect of small uniaxial stresses on the sintering of CdO powder compacts was studied using a loading dilatometer. Compacts of two different green densities were sintered at 1123 K and subjected to stresses between 0 and 0.25 MPa. Densification and creep occur simultaneously, and the effects of these two processes…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnhanced photoredox chemistry in quantized semiconductor colloidsJ. M. Nedeljkovic, M. T. Nenadovic, O. I. Micic, and A. J. NozikCite this: J. Phys. Chem. 1986, 90, 1, 12–13Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissu…
Some species of extremely halophilic archaebacteria, Halobacteriaceae, have been shown to accumulate large amounts of poly (beta-hydroxybutyrate) under conditions of nitrogen limitation and abundant carbon source. The production of poly (beta-hydroxybutyrate), at least in large quantities, was restricted to two carboh…
Crystal structure, composition and morphology of the precipitate in an aged Ti-51 at%Ni shape memory alloy have been examined by means of high voltage and high resolution analytical electron microscopy. As a result, the following have been clarified. The precipitate possesses a rhombohedral structure with a=0.670 nm a…
The biologic response to injectable, glutaraldehyde cross-linked, fibrillar collagen implants in the rat subcutaneous model was shown to be a function of the concentration of glutaraldehyde used for cross-linking. The collagen was prepared from bovine hide by pepsin solubilization and reconstituted as a fibrillar susp…
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Binuclear copper(II) complexes, [Cu2(L1)(O2CMe)]·H2O (1), [Cu2(L5)(O2CMe)]·MeOH (2), [Cu2(L5)(O2CPh)]·H2O (3), [Cu2(L3)(O2CMe)](4), [Cu2(L2)(O2CMe)](5), and [Cu2(L4)(OMe)(MeOH)](6) were prepared, where the ligands H3Ln are 1 : 2 Schiff bases derived from 1,3-diaminopropan-2-ol and the carbonyl compounds acetylacetone…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of arm number and arm molecular weight on the solid-state morphology of poly(styrene-isoprene) star block copolymersDavid B. Alward, David J. Kinning, Edward L. Thomas, and Lewis J. FettersCite this: Macromolecules 1986, 19, 1, 215–224Publication Date (Print):January…
To understand the relationship between the proliferation of epidermis and its arachidonic acid metabolism, we studied human keratinocytes grown in vitro at confluent or nonconfluent densities. Keratinocyte cultures incubated with [14C]arachidonic acid synthesized prostaglandin (PG)E2 PGD2, PGF2 alpha, and small quanti…
Description Twenty-two papers appear in this volume. The papers are divided into two areas: • strength and ductility • fatigue and fracture
Pour repousser la limite d'absorption des verres d'oxydes vers une longueur d'onde aussi elevee que possible, on a concu des systemes de verres contenant de l'oxyde de bismuth et de l'oxyde de plomb comme formateurs de reseau primaires, des additions d'oxyde ferrique a PbO−Bi 2 O 3 , CdO−Bi 2 O 3 , CdO−PbO−Bi 2 O 3 ab…
The study of defects in ordered media has become a subject of considerable interest to condensed matter physicists in recent years. This article presents a systematic account of the structures, energies and interactions of defects in the nematic, smectic, cholesteric and discotic phases of liquid crystals. Relevant ex…
On decrit la fabrication de composites de SiC renforces de fibres ceramiques par impregnation de vapeur chimique, liaison reactive par impregnation de silicium liquide, impregnation avec polymerisation subsequente et decomposition thermique des composes organosilicies. Les bases chimiques et physiques de ces processus…
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…