Materials Literature
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Fillers with dimensions in the nanometer range are important components of nanocomposites materials. A crucial point for the modeling of the resulting mechanical properties is to determine their average dimensions accurately as is required for the mechanical coupling modeling. In this work, reinforcing particules are…
The effect of ratio z on the high temperature magnetic properties of Sm(Co, Fe, Cu, Zr)z magnets have been examined in a range of ratio z values from 6.7 to 9.1. Reasonably high coercivity at room temperature has been achieved in all the magnets. It was found that the lower the ratio z, the smaller the temperature coe…
Modulation of the frequency and polarisation of emitted light is achieved with the structurally rigid tetraamide complexes of lanthanides (Ln = Eu, Tb, Yb and Dy; Ar = Ph, p-X-Ph; X = Br, CN, CO2Me; see picture). The configuration at C determines the metal-centred helicity, and overall quantum yields of up to 0.81 wer…
Factors affecting the synthesis and properties of a new generation of fine particle low voltage phosphors in field emission displays are reviewed. The morphology and particle size, the composition and stoichiometry, the stability, together with the nature and shape of the particle surface, all play important roles in…
We have investigated theorectically the elastic and yield behaviors of strongly flocculated colloids by first examining the yield forces between two particles within the framework of Derjaguin‐Landau‐Verwey‐Overbeck (DLVO) interactions. Under highly attractive conditions, i.e., in the absence of the secondary minimum…
We present detailed Monte Carlo results for the two-dimensional melting transition of various systems up to $N=65536$ hard disks. The simulations are performed in the $\mathrm{NVT}$ ensemble. In the isotropic phase the bond orientational correlation length ${\ensuremath{\xi}}_{6}$ and the susceptibility ${\ensuremath{…
Thermoelectric materials have the ability to convert heat to electricity and are currently used in Peltier cooling devices. Here is reported the combination of electrodeposition with template synthesis to prepare thermoelectric bismuth telluride nanowires within the pores of an alumina template membrane. The individua…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT"N-Fused Porphyrin" from N-Confused PorphyrinHiroyuki Furuta, Tomoya Ishizuka, Atsuhiro Osuka, and Takuji OgawaView Author Information Department of Chemistry, Graduate School of Science Kyoto University, Kyoto 606-8502, Japan Institute for Fundamental Research of Orga…
We estimate the rate at which randomly stacked hard-sphere crystals transform into the thermodynamically stable face-centered cubic phase. As an input for this estimate we need both the free-energy difference between bulk face-centered cubic (fcc) and hexagonal close packed (hcp) phases, and the hcp–fcc interfacial fr…
Hierarchical ordering of mesoporous silica induced by fluoride addition is described for aqueous acid-syntheses. The authors report that small amounts of fluoride make it possible to control the organization of the mesoporous materials on different length scales. At low pH, fluoride addition brings about the formation…
Programmed with an unusual number of functions, the tetraethynylethene derivative 1 exhibits three addressable switching subunits, which can undergo individual reversible switching cycles that are controllable by pH and light. Three "write/erase" processes and one "AND" logic gate process can be separately addressed,…
Summary 1. Diatoms were sampled in the spring of 1994 and the autumn of 1995 at 137 pristine or near‐pristine reference sites on large and small streams at various altitudes in eastern New South Wales and Victoria. Scrapings were taken from five firm substrata across a range of microhabitat conditions at each site on…
Self-assembly of predesigned angular and linear dipyridylporphyrin modules with bisphosphine-coordinated Pd(II) and Pt(II) angular and linear modules leads to cyclic porphyrin arrays containing two or four units and ranging in size from 15 to 39 Å. Multinuclear NMR spectra indicate high symmetry for these macrocycles.…
A new and simple chemical route has been used to synthesize mixed‐oxide powders. The method uses long‐chain polymers, such as poly(vinyl alcohol) and poly(ethylene glycol). The chemistry of the precursor solution differs from other solution‐polymerization techniques. The stabilization of the cations in the precursor i…
The effect of near-by-electrode charge injection on switching of a thin film ferroelectric capacitor is theoretically analyzed. We develop a model of switching affected by charge injection through a surface dielectric layer to calculate the coercive field of the capacitor as a function of both film thickness and maxim…
A novel hexagonal columnar liquid crystalline superlattice is coassembled from backbone(s) coated with a three-cylindrical bundle supramolecular dendrimer self-assembled from polymers containing twin dendritic benzamide side groups and their low molar mass side groups which self-assemble into supramolecular cylinders.
It is argued that the facile electron field emission from carbon systems occurs primarily because surface groups such as C–H can produce large changes in local electron affinity, so that electric fields from the anode can be focused toward unhydrogenated surface areas of high affinity, the fields ending on negative ch…
We have made a high-resolution quasielastic incoherent neutron scattering (QENS) study of the translational dynamics of supercooled water contained in micropores of Vycor glass at different hydration levels. QENS spectra from the confined ${\mathrm{H}}_{2}\mathrm{O}$ are analyzed in terms of the \ensuremath{\alpha}-re…
1,2-Bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene ( 1a ) was found to undergo photochromism in a single crystalline phase. Upon irradiation with ultraviolet light the colorless crystal turned red with keeping the crystal shape. The red color is due to the closed-ring form 1b . The red color was bleached by irradiat…
The electric field dependence of the piezoelectric properties of rhombohedral 0.955Pb(Zn1/3Nb2/3)O3–0.045PbTiO3 crystals were investigated as a function of orientation with respect to the prototypic (cubic) axes. For 〈111〉 oriented fields, depolarization and subsequent domain reorientation resulted in an apparent maxi…