Materials Literature
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The planar aromatic tridentate ligand 2,6-bis(1-methylbenzimidazol-2-yl)pyridine (L(1)) reacts with Ln(III) (Ln = La-Lu) in acetonitrile to give the successive complexes [Ln(L(1))(n)()](3+) (n = 1-3). Stability constants determined by spectrophotometry and potentiometric competitive titrations with Ag(I) show that the…
This research demonstrated for the first time a method for producing net shape polymer, ceramic and carbon composites using wood as a precursor. The conversion of wood to carbon has been practiced for centuries but the controlled thermal decomposition to form a monolithic carbon to be used as a template for composites…
An ionene-type polycation incorporating a nonlinear optical chromophore was synthesized. It was employed for the assembly of alternating polyelectrolyte multilayers on charged and uncharged substrates, using different organic polyanions as well as montmorillonite clay as anionic counterparts. The assembly process was…
peer reviewed
A family of liquid crystalline organic semiconductors based on perylene-3,4,9,10-tetracarboxyldiimide is introduced. The thermal transitions, self-organizing behavior, and change in photophysical properties upon self-organization of one member of the family are described. Red, polycrystalline thin films of spin-coated…
The chain folding behavior of oxyethylene/oxybutylene (E/B) diblock copolymers, with one crystallizable E block and one noncrystallizable B block, has been studied by simultaneous SAXS and WAXS, low-frequency Raman spectroscopy, and differential scanning calorimetry. Two models, normal density (ND) and crystal/liquid-…
The depth distribution of Ge implanted into thermally grown SiO2 films has been studied after annealing using transmission electron microscopy, Rutherford backscattering spectrometry, and x-ray diffraction. At annealing temperatures above 900 °C a significant redistribution of the as-implanted Ge profile was found. Cr…
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…