Materials Literature
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Boltron H30 is a polyester polyol with a dendritic structure, developed by Perstop Corp. Complete methacrylated H30 oligomers were obtained by using three different reaction routes, i.e., treatment of H30 with methacrylic anhydride, methacryloyl chloride and 2-isocyanatoethyl methacrylate (IEM). The viscosities of the…
Results of local spin-density approximation (LSDA) and LSDA + U calculations of the electronic structure and magnetic configurations of the 50% hole-doped pseudocubic perovskite La 0.5 Sr 0.5 MnO 3 and double-layered LaSr 2 Mn 2 O 7 are presented. We demonstrate that the on-site Coulomb correlation ( U ) of Mn d elect…
The synthesis, photophysical, and photochemical properties of a series of stable bacteriochlorins containing a fused six-member anhydride or an imide ring are discussed. The Q y band (a 1u → e gx transition) in the near-infrared region (NIR) lies between 788 and 831 nm depending upon the macrocycle substituents. Compo…
Abstract These days, auditors are more concerned than ever about what is “material.” SEC Staff Bulletin No. 99 listed qualitative factors to consider when determining materiality. It's worth re‐examining. © 2002 Wiley Periodicals, Inc.
A new mixed-valent silver complex [AgII(tmc)][AgII(tmc)(H2O)]2·[AgI11(C2)(CF3CO2)12(H2O)4]2 (tmc = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane) was synthesized by adding tmc to a concentrated aqueous solution of silver trifluoroacetate containing dissolved silver acetylide. Single-crystal X-ray analysis rev…
The calculation of dipole moments of nonlinear optical (NLO) chromophores can be carried out with a variety of theoretical approaches. A systematic study of the available calculation methods is presented. The study focuses on a series of NLO chromophores with varying electron-donor and electron-acceptor fragments and…
Thermally induced transition between anhydrous and hydrated forms of highly crystalline beta-chitin was studied by differential thermal calorimetry (DSC) and X-ray diffraction. DSC of wet beta-chitin in a sealed pan gave two well-defined endothermic peaks at 85.2 and 104.7 degrees C on heating and one broad exothermic…
Electron paramagnetic resonance, electronic absorption, and resonance Raman spectroscopy reveal that in the oxalate-bridged compounds, [[(tBuCO2)3M2]2(mu-O2CCO2)]+[PF6]-, the unpaired electron is delocalized over four metal centers (M = Mo or W) as a result of M2 delta to bridge pi conjugation, but in the related cati…
Glycofunctionalized gold nanoparticles can easily be manipulated as water-soluble macromolecules, highly stable in colloidal solutions. Different nanostructures (see Figure for an example) have been obtained by varying the particle concentration, the Ca2+ level in the solution, and type of oligosaccharide. A potential…
Cationic terbium complexes bearing an N-methylphenanthridinium chromophore have been incorporated in sol–gel thin films and their response characteristics analysed with respect to variations in dissolved oxygen concentration. Analysis of the emission lifetime decay curves (547 nm) has allowed a linear calibration mode…
Self-assembled multilayers composed of alternated layers of glucose oxidase (GOx) and poly(allylamine) covalently attached to [Os(bpy) 2 ClPyCOH] + (PAH−Os), deposited on a 3-mercaptopropanesulfonic acid (MPS)-modified gold surface were studied “ex situ” and “in situ” (with the films in contact with water) by ellipsom…
We show that magnetic structures involving partial disorder of local magnetic moments on the Mn atoms in (Ga(1)-(x)Mn(x))As lower the total energy, compared to the case of perfect ferromagnetic ordering, when As defects on the Ga sublattice are present. Such magnetic structures are found to be stable for a range of co…
We present results of a dc magnetization study which show interesting thermomagnetic history effects across the antiferromagnetic-to-ferromagnetic transition in Ce(Fe 0.96 Al 0.04 ) 2 pseudobinary alloy. Specifically, we observe (i) the degree of ZFC/FC irreversibility rising with increasing field; (ii) the virgin cur…
This work discusses the current situation in the study of bulk defects in diamond, grown by chemical vapour deposition (CVD), using optical absorption, luminescence, and electron spin resonance techniques. CVD diamond appears distinct from other types of diamond in that it exhibits significant concentrations of bulk d…
Abstract Polypyrroles doped with two dopants were prepared by chemical polymerization in aqueous solutions of pyrrole monomer. The solutions contained dodecylbenzenesulfonic acid (DBSA) as a dopant, tetraethylammonium tetrafluoroborate (TEABF 4 ) as a codopant, and ammonium persulfate (APS) as an oxidant. The PPy comp…
Crack growth resistance curves for the non-linear fracture parameters KR, JR and R were measured for unirradiated PGA and IM1-24 graphites that are used as moderators in British Magnox and AGR nuclear reactors respectively. All the curves show an initial rising part, followed by a plateau region where the measured par…
Budlike single-wall carbon nanohorns (SWNHs), being capped hollow materials, were oxidized by heating in oxygen to produce nano-order windows in the walls. The opening of budlike SWNHs was studied with transmission electron microscopy and nitrogen adsorption at 77 K. The adsorption isotherms show development of the po…
In this paper we review the existing theoretical literature on hydrogen storage in single-walled carbon nanotubes. The importance of theoretical simulations for understanding the adsorption procedure and for improving the storage capacity of these nano-materials is underlined. We report two different categories of the…
Supramolecular triads of the type (donor-1)−acceptor:(donor-2) composed of free-base porphyrin, fullerene, and zinc porphyrin, have been formed by a “covalent-coordinate” approach. Toward this, two diads, namely, 5-(3‘-(2‘ ‘-(3‘ ‘‘ or 4‘ ‘‘-pyridyl)fulleropyrrolidinyl- N )ethoxyphenyl)-10,15,20-triphenylporphyrin, bea…
36 kinds of donor(D)–acceptor(A) type charge transfer (CT) solids were prepared based on ethylenedioxyethylenedithiotetrathiafulvalene (EDOEDT-TTF or EOET), which is a hybrid molecule of bis(ethylenedioxy)-TTF (BEDO-TTF or BO) and bis(ethylenedithio)-TTF (BEDT-TTF or ET). A plot of the first CT absorption bands in sol…