Materials Literature
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Abstract A brief review is given of the ways in which the local structure in glass can influence the microstructure that supports ionic transport. This in turn contributes to the co-operative nature of ion dynamics and ways in which this underpins the ‘mixed alkali effect’ are discussed. Glass microstructure too is ex…
Abstract The crystal structure of the high-pressure phase-II of cristobalite has been solved by neutron diffraction (space group P 2 1 / c , a = 8.3780(11) Å, b = 4.6018(6) Å, c = 9.0568(13) Å, β = 124.949(7)°, at P = 3.5 GPa). This phase corresponds to a distortion of the high-temperature cubic β-phase, rather than o…
Low‐oxygen silicon carbide fibers (Hi‐Nicalon) were oxidized at temperatures from 1073 to 1773 K under an oxygen partial pressure of 0.25 atm. The strength of the unoxidized core was practically unaffected by the oxidation temperatures. The strength of the as‐oxidized fibers with an SiO 2 film decreased markedly with…
Proton, deuteron, and carbon NMR methods were applied to study various isotopic species of supercooled and glassy propylene carbonate. The molecular diffusion was investigated via static field gradient diffusometry and yielded evidence for a particularly pronounced enhancement of the translational over the reorientati…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.Highly Efficient Complexations of a Porphyrin Dimer with Remarkably Small Differences between Nucleosides and Nucleotides/The Predominance of Stacking Interactions for Nucleic Acid ComponentsMallena…
The uniaxial anisotropy energy of arrays of submicronic (30--500 nm) Ni wires synthesized by electrodeposition into cylindrical pores of track-etched polycarbonate membranes is studied as a function of temperature. At room temperature, the uniaxial anisotropy is equal to the shape anisotropy whereas an additional cont…
With 1999 marking the 100th anniversary of the discovery of organic photochromic compounds1, it is a fitting time to reflect back on commercial uses that have developed from this interesting class of organic compounds over the years. From the many applications that have been proposed, including security devices and op…
The base hydrolysis of gallium chloride and gallium nitrate was followed by combining 71 Ga NMR and Ga K-edge X-ray absorption spectroscopy measurements. Using such an approach, it can be shown unambiguously that the solution contains various trimeric and tetrameric species in the early hydrolytic stages before the fo…
The structure factor of a fragile glass-forming liquid orthoterphenyl was measured in the previously inaccessible intermediate q range between the conventional light scattering (LS) and small-angle x-ray scattering (SAXS) q ranges using the low-angle scattering beam line at the European Synchrotron Radiation Facility.…
ADVERTISEMENT RETURN TO ISSUEPREVNoteADDITION / CORRECTIONThis article has been corrected. View the notice.Stability and Structure of Doubly N-Confused PorphyrinsHiroyuki Furuta, Hiromitsu Maeda, and Atsuhiro OsukaView Author Information Department of Chemistry, Graduate School of Science, Kyoto University, 606−8502 K…
Scanning electron microscopy was used to study the morphology of metal−TiO 2 composite films prepared for photoelectrochemical applications. These films consisted of electrodeposited Ni, Cu, Ag, or In with TiO 2 (Degussa P-25) particles occluded in them. In the case of Ni−TiO 2 composites, co-clusters of nickel and Ti…
Hypercrosslinked polystyrene samples were prepared by an intensive postcrosslinking of highly swollen styrene–divinylbenzene copolymer beads to extremely high degrees of crosslinking that amounted to 100% or even higher. When in the dry state, the materials obtained represent transparent beads of reduced density. Desp…
A vertical sweating skin model is developed and changes in vapor pressure within a clothing system are measured to investigate the effects of fiber type, air layer thickness, and garment openings on the microclimate. Cotton broadcloth, polyester broadcloth and cotton canvas are considered. Openings of a garment, such…
Novel structural microspheres of the Janus type, with microphase-separated polystyrene (PS) and poly(tert-butyl methacrylate) (PBMA) shells and crosslinked poly(2-vinyl pyridine) (PVP) cores, were synthesized with the crosslinking of PVP spherical domains in poly(styrene-block-2-vinyl pyridine-block-tert-butyl methacr…
Amorphous carbon films with an sp3 content up to 25% and a negligible amount of hydrogen have been grown by evaporation of graphite with concurrent Ar+ ion bombardment. The sp3 content is maximized for Ar+ energies between 200 and 300 eV following a subplantation mechanism. Higher ion energies deteriorate the film due…
In this work, the nucleation and crystallization of immiscible blends of poly(propylene) (PP) with ethylene/α-olefin copolymers of different branching contents (Linear Low Density Poly(ethylene), LLDPE, Very Low Density Poly(ethylene), VLDPE, and Ultra Low Density Poly(ethylene), ULDPE) were studied. Melt-mixed blends…
Electron paramagnetic resonance (EPR) and high-resolution fluorescence spectra of ${\mathrm{Nd}}^{3+}$ ions in weakly doped ${\mathrm{LiYF}}_{4}$ and ${\mathrm{YVO}}_{4}$ crystals are analyzed. A simple model, based on an effective spin-Hamiltonian approach is proposed to explain the general features of the EPR and op…
A monodisperse liquid foam is allowed to coarsen while subject to a constant flow of liquid. The average bubble size is indirectly monitored by measurement of the velocity of forced drainage waves. After an initial period the average bubble diameter is found to increase with the square root of time. The rate of this i…
LALP70 is a novel lysosomal membrane protein belonging to the apyrase protein family. The apyrase protein family comprises enzymes capable of cleaving nucleotide tri- and diphosphates in a calcium- or magnesium-dependent manner, not being altered by P-type, F-type, or V-type NTPase inhibitors. In this study we have cl…
The growth rates of four saline-lake diatom taxa were measured under varying conditions of salinity (5, 8 and 11‰), brine type (sulfate- versus bicarbonate-dominated) and nitrogen form (NH4+ versus NO3–), using a full factorial design. With NO3– as the nitrogen source, Cyclotella quillensis, Cymbella pusilla and Anomo…