Novel photocatalysts, ion-exchanged K4Nb6O17, with a layer structure
Proton-exchanged K4Nb6O17 showed high activity for H2 evolution from aqueous methanol solution without any assistance from other materials such as noble metals.
Materials Literature
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Upward creep of a wetting fluid : a scaling analysis
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…
Properties of II–VI semiconductors associated with moving dislocations
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…
Effect of Shear Stress on Sintering
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…
Interphases in systems of conducting phases (Recommendations 1985)
Abstract
Enhanced photoredox chemistry in quantized semiconductor colloids
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…
Accumulation of Poly (β-Hydroxybutyrate) by Halobacteria
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 a Precipitate in an Aged Ti-51 at%Ni Shape Memory Alloy
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…
An examination of the biologic response to injectable, glutaraldehyde cross‐linked collagen implants
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…
Recent studies in phthalocyanine chemistry
Abstract
Crystal structures and magnetism of binuclear copper(II) complexes with alkoxide bridges. Importance of orbital complementarity in spin coupling through two different bridging groups
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…
Effect of arm number and arm molecular weight on the solid-state morphology of poly(styrene-isoprene) star block copolymers
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…
Modulation of keratinocyte proliferation in vitro by endogenous prostaglandin synthesis.
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…
The Use of Small-Scale Specimens for Testing Irradiated Material
Description Twenty-two papers appear in this volume. The papers are divided into two areas: • strength and ductility • fatigue and fracture
Heavy metal oxide glasses containing Bi2O3
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 structure and energetics of defects in liquid crystals
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…
Fiber-reinforced silicon carbide
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…
The relationship between microstructure and mode of fracture in polyhydroxybutyrate
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…
Conducting polymer solutions
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…
Thermal conductivity of metals and alloys
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…