Materials Literature
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Six members of a new homologous series of achiral banana-shaped molecules have been synthesized and studied by optical microscopy, differential scanning calorimetry, NMR spectroscopy and X-ray diffraction. According to X-ray diffraction measurements on oriented samples, four homologues form an XB2 phase behaviour. Fro…
Polyaniline (PANI) has been electrodeposited on iron in oxalic medium in order to evaluate the protective character of this polymer. PANI has been found to be efficient for corrosion protection during at least 10 h in a pH 4.5 sulfate medium. Interaction between the passive layer and polymer has been studied using spe…
Photochromism that arises from the main polymer backbone is reported for the first time. The synthesized polymer with the diarylethene repeat unit is demonstrated to have photochromic properties superior to those of the monomer. The polymer has high thermal stability and its cyclization quantum yield (0.85) is very hi…
A sonoluminescing bubble has been modeled as a thermally conducting, partially ionized plasma. The model is more complete than previous models, due to the inclusion of both plasma and normal molecular thermal conduction, vapor pressure, surface tension, the mixing of gas and water vapor in the bubble, and opacities. T…
We consider a model of strongly correlated ${e}_{g}$ electrons interacting by superexchange orbital interactions in the ferromagnetic phase of ${\mathrm{LaMnO}}_{3}.$ It is found that the classical orbital order with alternating occupied ${e}_{g}$ orbitals has a full rotational symmetry at orbital degeneracy, and the…
The third-generation dendrimer with 45 platinum atoms (shown schematically) was synthesized efficiently by a convergent methodology in which two different trialkylsilyl groups (symbolized by the nodal points) are used to protect the bridging triethynylbenzene derivatives. PT=[Pt(PEt3)2].
We describe the introduction of zirconium metal centers into the cubic phase of mesoporous silica. Two methods of zirconium incorporation were compared consisting of hydrothermal Si/Zr coprecipitation and postsynthesis functionalization of surface silanols with zirconium propoxide. Nitrogen sorption and X-ray powder d…
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.…