Materials Literature
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The first global simulation of semiconductor-based quantum-cascade lasers is presented; Our fully three-dimensional approach allows to study in a purely microscopic way -without resorting to phenomenological parameters- the current-voltage characteristics of state-of-the-art unipolar nanostructures. Based on the propo…
Transparent lyotropic ferronematic dispersions are synthesized by admixing a cationic ferrofluid to the lyotropic liquid crystal PL/1D/Wt. The transparency is spontaneous and time-independent. It is observed in zero magnetic field in white and polarized light for disordered layers of ferroliquid crystals of thicknesse…
The properties of neutral and anionic ${\mathrm{Pd}}_{N}$ clusters were investigated with spin-density-functional calculations. The ground-state structures are three dimensional for $N>3$ and they are magnetic with a spin triplet for $2\ensuremath{\le}N\ensuremath{\le}7$ and a spin nonet for $N\phantom{\rule{0ex}{0…
The work function at the tips of individual multiwalled carbon nanotubes has been measured by an in situ transmission electron microscopy technique. The tip work function shows no significant dependence on the diameter of the nanotubes in the range of 14–55 nm. Majority of the nanotubes have a work function of 4.6–4.8…
A low energy Ar + ion-beam was used to modify the surface of a high-density polyethylene (HDPE) dry powder. The modification reaction was promoted by the oxygen gas injected during the irradiation. This simple modification route is characterized as a heterogeneous, solvent-free, environmentally favorable process. The…
The coordination chemistry of a Rh(III) porphyrin building block was investigated with a view to the construction of heterometallic arrays of porphyrins. The Rh(III) porphyrin was found to coordinate methanol in the solid state and weakly in CDCl(3) solution. Crystallization afforded five coordinate pi stacked Rh(III)…
The morphological behavior of a series of binary mixtures of polystyrene- block -polyisoprene (SI) diblock copolymers has been investigated by small-angle X-ray scattering and transmission electron microscopy. These mixtures consist of a given asymmetric SI diblock, coded as, which itself exhibits a morphology of poly…
Thermoplastic sheets prepared from soy protein isolate (SPI) with ethylene glycol (EG) as the plasticizer were obtained by compression molding under a pressure of 15 MPa at 150 °C. The effects of the glycol content on the structure and properties of thermoplastic SPI were investigated by using infrared, X-ray diffract…
The change in hardness and chemical potential along a reaction coordinate has been studied on the basis of the finite difference formula for hardness and chemical potential. The conditions where the hardness profile can have an extremum along the reaction coordinate are identified. Numerical demonstrations of inversio…
The kinetics, molecular weight averages, and the average degree of branching, DB, are calculated for the self-condensing vinyl copolymerization (SCVCP) of a vinyl monomer M with an “inimer” AB* in the case of different reactivities of active species. Emphasis is given to two limiting cases: formation of “macroinimers”…
The synthesis of planar arrays of metal nanoparticles is an important goal in nanotechnology. As shown in the picture, superlattices of gold nanoparticles are readily assembled by biomolecular templating using bacterial S-layer membranes. Only nanoparticles of certain size and charge are organized in regular patterns,…
Silberdoppelsalze mit eingeschlossenen Carbidionen wurden mit [15]Krone-5 (15C5) als Strukturdirektor hergestellt. Die Dimensionalität der Verbindungen ist ausgesprochen niedrig; es handelt sich entweder um diskrete Moleküle oder Zickzack-Ketten. Sie enthalten verschiedenartige Silberkäfige, die sandwichartig durch η5…
The order-disorder phase transitions of ${\mathrm{KNO}}_{2},$ ${\mathrm{CsNO}}_{2},$ and ${\mathrm{TlNO}}_{2}$ have been studied using parameter-free molecular dynamics simulation. It is found that the phase transitions in nitrites investigated are driven by the rotations of the ${\mathrm{NO}}_{2}^{\ensuremath{-}}$ io…
Abstract A new family of porous fluorinated membranes was developed from perfluoropolyethers (PFPEs). The PFFE–dimethacrylate (3) was dispersed in isopropanol to form a clear homogeneous solution, which after UV curing in polypropylene molds formed a porous polymer disk. A series of 10 polymers was prepared with ratio…
Abstract A cationic poly(methyl iodide quaternized styrene– N , N ‐dimethylaminopropylmaleamidic acid) copolymer was synthesized through amidoacidification reaction of styrene‐maleic anhydride copolymer with N , N ‐dimethylaminopropylamine (ring‐opening reaction). Its properties in various aqueous salt solutions and p…
Abstract Cotton fibers treated with liquid ammonia and sodium hydroxide were hydrolyzed with crude cellulase. The structural change in the fibers due to the cellulase treatment was examined in relation to the apparent affinity of Congo Red. The cellulose III crystalline structure collapsed and generated intermediate‐m…
In this paper, we examine the wet-air oxidation (WAO) of four nuclear-fuel-chelating compounds [diethylenetriaminepentaacetic acid (DTPA), ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), and thenoyltrifluoroacetone (TTA)]. The study focuses on the kinetics and mechanism of the degradation process.…
Abstract The morphologies of poly(ϵ‐caprolactone) (PCL) blends with hydroxyethyl cellulose acetate (HECA), a thermotropic liquid crystalline polymer (TLCP), were investigated by optical microscopy. It is demonstrated that when the pure PCL is crystallized from the melt, a spherulitic morphology arises with distinct Ma…
Abstract Eight kinds of self‐catalyzed poly( ortho ‐esters) (POEs) are used to fabricate bovine serum albumin (BSA)‐containing microspheres using a W/O/W double‐emulsion solvent extraction/evaporation method. All eight kinds of POE polymers used in this study are shown able to form microspheres under proposed fabricat…
Abstract High‐speed spinning of poly(ethylene terephthalate) with an intrinsic viscosity of 0.98 dL/g was performed at a take‐up velocity of 2.5–5.5 km/min, and the effects of the fiber structure on the isothermal and nonisothermal shrinkage‐stress evolution in as‐spun filaments were investigated. In isothermal measur…