Materials Literature
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The growth of CdS 0.08 Se 0.92 nanoparticles in glass is studied through the analysis of optical absorption spectra with the help of a quantized-state effective-mass model in which the conduction band effective mass is particle size dependent. The glass includes nanoparticles with an initial average size of ~1.4 nm on…
Stable translucent aqueous suspensions of ligand-functionalized nanoparticles, with average diameters ranging from 12 to 20 nm and containing from 0.25 to up to 0.75 mmol of ligand/g, are readily obtained by copolymerization in oil-in-water microemulsions of a polymerizable tetraaza macrocycle, vinylbenzylcyclam (cycl…
A new series of regioregular poly(terthiophenes), bearing bis(thioether) side groups, has been prepared by electrochemical oxidation. Cyclic voltammetry of the parent trimers reveals an increase in electron donating ability in cyclic thioether derivatives. For example, one compound containing a central ethylenedithiot…
Using a simple mean-field density functional approach we investigate the adsorption of a binary fluid mixture of repulsive Gaussian core particles at a repulsive planar wall. For certain choices of wall-fluid potential we find a first-order wetting transition, and the accompanying pre-wetting line, whereby the fluid p…
Fluoropolymer films were deposited on pristine and N2 plasma-pretreated copper foil surfaces by plasma polymerization of allylpentafluorobenzene (APFB) under different glow discharge conditions and using argon as the carrier gas. The effect of the radio-frequency (RF) plasma power on the surface composition and chemic…
An organic soluble polyimide was prepared from 3,3′-dihydroxybenzidine and 2,2-bis(phthalic anhydride)hexafluoropropane. The two hydroxy groups in the repeating unit of the polyimide thus prepared were utilized in attaching 4-nitro-4′-diphenylaminoazobenzene chromophores onto the main chain perpendicularly (or in an e…
Abstract A series of amphoteric polyacrylamides with different molecular weights and charges were prepared by the copolymerization of acrylamide with sodium acrylate and a subsequent Mannich reaction. The copolymerization was carried out with a redox initiation system via inverse emulsion polymerization. Reaction cond…
Abstract A spherical TiCl 4 /MgCl 2 ‐based catalyst was used in the synthesis of in situ isotactic polypropylene/ethylene–propylene random copolymer blends by propylene bulk polymerization and subsequent gas‐phase copolymerization of ethylene with propylene. Different copolymerization conditions, such as the reaction…
We study the effects of pressure on the existence of floppy modes in silica glass. We find that small values of pressure do not alter the ability of silica glass to sustain floppy modes, as long as they are not accompanied by changes in the topology of the glass, and thus do not change the balance between the number o…
Introduction of a single meso substituent into ClFe(III)(OEP) or K[(NC)(2)Fe(OEP)] results in significant changes in the geometric and/or spectroscopic properties of these complexes. The mono-meso-substituted iron(III) complexes ClFe(III)(meso-Ph-OEP), ClFe(III)(meso-n-Bu-OEP), ClFe(III)(meso-MeO-OEP), ClFe(III)(meso-…
The air-synthesized La 1- x Ba x MnO 3 system was revisited for 0.4⩽ x ⩽0.9. We show that this system exhibits an insulator-metal like transition, T IM (175-230 K), far below the Curie temperature ( T C ≈335 K). In contrast to previous studies, we demonstrate that this system is multiphase, i.e. involving a hexagonal…
Ion-beam-induced microstructures in magnesium aluminate (MgAl 2 O 4 ) spinel have been examined using transmission electron microscopy (TEM). Irradiations were performed at cryogenic temperature (~120 K) on MgAl 2 O 4 spinel single-crystal surfaces with (111) orientation, using 180 keV neon (Ne + ) ions to ion fluence…
The intercalation process of hexadecylamine into bentonite and the fine structure of hexadecylamine in nanoscale confined space are studied by differential scanning calorimetry and X-ray diffraction. Intercalated amine exhibits multiple melting temperatures that are approximately 30 °C higher than the bulk amine, prov…
An efficient computational scheme based on the first-principles pseudopotential method is proposed for the electron emission from nanostructures under an applied electric field. The emission rate of the electron through the potential barrier is calculated by integrating the time-dependent Schr\"odinger equation for th…
Abstract A series of uniform, macroporous particles with different surface chemistries were prepared with different acrylic comonomers [methyl methacrylate (MMA), butyl methacrylate (BMA), epoxypropyl methacrylate (EPMA), 2‐hydroxyethyl methacrylate (HEMA), and methacrylic acid (MAA)] with styrene–divinylbenzene (S–DV…
Abstract Model bioactive compounds with different molecular and functional characteristics were entrapped in gel beads prepared by polyelectrolyte complexation of chitosan and pentasodium tripolyphosphate (TPP). Three compounds of interest to the food and biomedical industries were tested: (1) lysine, (2) bovine serum…
Abstract A series of hyperbranched polyurethane acrylates containing phosphorus were prepared by reaction of a phosphorus‐containing triol with toluene‐2,4‐diisocyanate and hydroxylethyl acrylate at given ratios. The resins obtained were found to polymerize rapidly in the presence of a photofragmenting initiator under…
The reaction of pyridyl functionalized porphyrins with Re(CO)(5)Cl in THF results in the formation of porphyrin dimers which, despite incorporation of rhenium into the assemblies, remain fluorescent. The rigid compounds provide an efficient geometry and/or orbital pathway for singlet energy transfer, rendering these c…
Abstract Ground rubber tire (GRT) powder was maleated in an internal mixer using maleic anhydride and dicumyl peroxide at 160°C. Maleated GRT was characterized by using X‐ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, wettability, and differential scanning calorimetry. The physical properties…
Using first-principles band structure methods we have systematically studied the electronic and optical properties of p-type transparent conductive oxides ${\mathrm{SrCu}}_{2}{\mathrm{O}}_{2}$ and related compounds ${A}^{\mathrm{II}}{\mathrm{Cu}}_{2}{\mathrm{O}}_{2},$ where $A=\mathrm{Mg},$ Ca, and Ba, as well as thei…