Materials Literature
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The three-dimensional network complex was prepared by engaging the multibinding terephthalate dianion and nonchelating 3(5)-methylpyrazole as bridge and end-capping ligand, respectively. The overall antiferromagnetism of the complex was explained in terms of blended magnetism of weak antiferromagnetic and ferromagneti…
Complexation of 3,4-dialkoxystilbazoles to Ag I has led to a new series of polycatenar, metal-containing liquid crystals. The complexes were found to show mainly cubic and columnar mesophases, although short-chain homologues showed a different behavior due to a dissociation of one ligand in the melt. On cooling from t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTConcentration Dependence of Aggregation of Polyaniline in NMP Solution and Properties of Resulting Cast FilmsW. Zheng, M. Angelopoulos, A. J. Epstein, and A. G. MacDiarmidView Author Information Department of Chemistry, University o…
A new strategy to create well-ordered latex particle monofilms from polydisperse latex solutions was developed. Due to size-dependent segregation, the spherical particles assemble in grains with a uniform sphere size within each grain. The size-dependent segregation process can be deduced from the action of a single f…
A central unanswered question in phototransduction is how photosensitive molecules, visual pigments, regulate their absorption spectra. In nature, there exist various types of visual pigments that are adapted to diverse photic environments. To elucidate the molecular mechanisms involved in the adaptive selection of th…
Several attempted syntheses of Ti-TMS1, a hexagonal mesoporous TiO2 reported by Antonelli and Ying, have resulted in a lamellar structure as determined by two-dimensional powder X-ray diffraction and transmission electron microscopy (TEM). Regions of partially calcined lamellar materials, when observed by TEM can be m…
Many vascular plant species are unable to colonize limestone soils and the floristic composition of adjacent limestone and acid silicate soils differs greatly. Low-molecular organic acids (LOAs) in root exudates may greatly affect plant availability of nutrients and it is hypothesized that contrasting exudation of LOA…
Undoped or Y 2 O 3 ‐doped ZrO 2 thin films were deposited on self‐assembled monolayers (SAMs) with either sulfonate or methyl terminal functionalities on single‐crystal silicon substrates. The undoped films were formed by enhanced hydrolysis of zirconium sulfate (Zr(SO 4 )·4H 4 O) solutions in the presence of HCl at 7…
We have found a novel feature of the bistable large-spin model described by the Hamiltonian $H{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{-}DS}_{z}^{2}{\ensuremath{-}H}_{x}{S}_{x}$. The crossover from thermal to quantum regime for the escape rate can be either first $({H}_{x}<SD/2)$ or second $(…
The type of bait determines the prey: in a pond with triethanolamine ligands and iron(III) ions, six- (1) or eight-membered (2) iron coronates can be captured, depending upon whether sodium or cesium ions are used as the bait. This finding is especially interesting in connection with a possible combinatiorial approach…
The equations of nematic liquid crystal hydrostatics are used to determine the driving forces that cause the breakup of catenoidal shaped liquid crystalline networks during the phase separation of isotropic and nematic phases. The catenoidal shaped liquid crystalline network is assumed to be an elastic network embedde…
The original theory of the fibrogram as developed by Hertel more than fifty years ago has served as the basis of all subsequent cotton length measurements. Hertel's mathematical derivation is based on the assumptions that the sampling probability of each fiber in forming a fiber beard is proportional to its length and…
Abstract A new superaustenitic stainless steel is described in terms of chemical composition. mechanical properties and corrosion resistance. Results obtained by using this highly alloyed stainless steel, EN 1.4652, in a number of hostile environments are reported. Applications include neutral and acid chloride contai…
The crystal structure of low temperature NaNiO 2 has been refined by Rietveld methods using powder X-ray diffraction and neutron scattering data. The starting model was based on parameters that had been obtained earlier by X-ray film methods. At room temperature NaNiO 2 is monoclinic, C 2/ m , a =0.53192(2), b =0.2845…
Using the p-type surface-conductive layer of diamond film, enhancement mode and depletion mode metal-semiconductor field effect transistors were fabricated on the same surface by changing the metals of the gate electrode. The threshold voltages of p-type metal semiconductor field effect transistors (MESFETs) can be co…
The formidable task of determining a mathematical form of the trap distribution in a solid has been solved for the case of an unusually broad thermoluminescence (TL) glow peak of a Brown microcline (feldspar, triclinic form of KAlSi3O8). An exponential distribution of traps gives the best fit to the experimental glow…
A simple and general stepwise procedure for the synthesis of linear monodisperse liquid crystalline (LC) polyethers with degrees of polymerization (DPs) up to 33 ( M n = 15 090) is presented. The particular examples used for this demonstration are based on the conformationally flexible mesogen 1-(4-hydroxy-4‘-biphenyl…
Polyfurfuryl alcohol (PFA) is pyrolyzed at 600 °C for different lengths of heat-treatment (HT) time (0–50 h) and at different pyrolytic temperatures (600–850 °C) for 4 h. Analysis by Raman spectroscopy shows that the crystallite size of PFA pyrolyzed at 600 °C decreases with increasing HT time. This suggestion is supp…
The theory of space-group representations is extended to aperiodic crystals by reformulating it as the theory of symmetry-required degeneracies of electronic levels that emerges from the Fourier-space approach to crystal symmetry. As an illustration it is shown that the nonvanishing of a simple linear combination of p…
Reports on investigations into the mechanism of sewing thread strength reduction. Results indicate that structural damage, namely, structural openness and pull‐out of fibre ends from the surface are the major cause of strength reduction and that the fibre strength reduction is found to be only marginal compared to the…