Materials Literature
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The Stokes emission of nanocrystalline and bulk Y 2 O 3:Er 3+, Yb 3+ following 488 nm were reported. Two nanocrystalline samples were studied, one produced via propellant synthesis and the other via wet synthesis. Green, red, and NIR emission from the Er 3+ ion was observed in both bulk and nanocrystalline samples. Em…
A novel heterospin complex containing both macrocyclic and imino nitroxide radical ligands: {[CuL(H2O)](CuL)Mn(IM-2Py)}{[CuL(MeOH)](CuL)Mn(IM-2Py)}(ClO4)4·MeOH, has been synthesized and its crystal structure determined by X-ray diffraction methods. In order to interpret the exchange interaction of this asymmetric hete…
Abstract A styrene–butadiene–styrene triblock copolymer (SBS) was functionalized with glycidyl methacrylate (GMA). Grafting reactions were carried out in an internal mixer at 170°C, using dicumyl peroxide (DCP) as an initiator. The effect of three variables, % GMA, % DCP, and reaction time, on grafting were studied us…
A series of novel chlorosilyl functional initiators have been prepared and applied for the first time in the living cationic polymerization of isobutylene (IB). Well‐defined polyisobutylenes (PIBs) carrying mono‐, di‐, and tri‐chlorosilyl head‐group, and a tert‐chloro end‐group were synthesized using newly designed si…
A novel organic–inorganic hybrid compound [Cu(phen)]2[VIVV4VAs2VO19]·0.5H2O 1 has been hydrothermally synthesized. Its structure, determined by single crystal X-ray diffraction, exhibits an unusual two-dimensional arsenic vanadate layered network grafted with the [Cu(phen)]2+ complex. The chelating phen ligands projec…
Transport properties of the manganites by the double-exchange mechanism are considered. The system is modeled by a simplified double-exchange model, i.e. the Hund coupling of the itinerant electron spins and local spins is simplified to the Ising-type one. The transport quantities such as the electronic resistivity, t…
The elastic properties of planar, C4-symmetric networks under stress and at nonzero temperature are determined by simulation and mean field approximations. Attached at fourfold coordinated junction vertices, the networks are self-avoiding in that their elements (or bonds) may not intersect each other. Two different mo…
Granular γ-Al 2 O 3 support and 8 wt % CuO/γ-Al 2 O 3 catalyst were synthesized by a sol−gel granulation method. The pore structure, crush strength, hardness, and elasticity of these sol−gel-derived catalysts were studied and compared with similar commercial catalysts prepared by non-sol−gel methods. Alumina and CuO-c…
Abstract The synthesis was performed by the electropolymerization of thiophene on a poly(dimethylsiloxane) (PDMS)‐coated platinum electrode at 2.2 V with tetrabutylammoniumtetrafloroborate (TBAFB) as a supporting electrolyte and with acetonitrile as a solvent. The characterization of the PDMS–polythiophene (Pth) compo…
Clay–polymer hybrid materials are prepared from natural attapulgite (ATP) that was first modified with silane coupling agent, and next, graft polymerization processed with butyl acrylate (BA). The silane‐modified ATP dispersed in a solution of acrylate in toluene. In this system, free‐radical polymerization was carrie…
The relaxation process of pristine polypyrrole/dodecyl sulfate (PPy/DS) films at open circuit, immediately after electropolymerization, was studied by in situ spectroelectrochemical, alternating-current conductance, electrochemical quartz crystal microbalance, and pH-metric techniques. A new phenomenon, called irregul…
A one pot reaction between the [Mo IV (CN) 8 ] 4- unit and the [Cu(cyclam)] 2+ complex (cyclam = 1,4,8,11-tetraazacyclodecane) in aqueous solution yields the new cyano-bridged coordination polymer [Cu(cyclam)] 2 [Mo(CN) 8 ]·10.5H 2 O. The compound presents an unusual two-dimensional framework with neutral zigzag sheet…
Calculations have been performed on the transition metal hydroxides CuOH, AgOH, and AuOH using SCF and the coupled-cluster with singles, doubles, and perturbative triples (CCSD(T)) methods. The relativistic effect was included in the third-order Douglas—Kroll approximation. Equilibrium geometries, dissociation energie…
In this paper we demonstrate the crystallization of strontium carbonate in the form of thin sheets/ribbons within thermally evaporated sodium bis-2-ethylhexylsulfosuccinate (aerosol OT, AOT) thin films by a process of Sr 2+ ion entrapment followed by reaction with CO 3 2 - ions within the lipid matrix. The morphology…
This communication reports the SERS observation of p-benzosemiquinone radical anion, produced on reduction of p-benzoquinone by Ag nanoparticles at the metal-water interface. The species is positively identified by comparison of the SERS spectrum with the resonance Raman spectra of the radical anion in aqueous solutio…
Layer-by-Layer (LbL) assemblies are multi-modular constructions created on solid substrate mainly via electrostatic interactions between polyanions and polycations. The LbL approach can be used for the inter-layer immobilization of biomolecules with enhanced properties for biocatalytic and immunosensing applications,…
Self‐assembled monolayers of carbamoylphosphonic acids (acetamide phosphonic acid and propionamide phosphonic acid) on mesoporous silica supports were studied as potential absorbents for heavy and transition metal ions in aqueous wastes. The adsorption capacity, selectivity, and kinetics of the materials in sequesteri…
An analysis is made of the amount of carbonaceous contamination remaining on silicon wafers with a thin oxide overlayer. Wafers are either left “as-received” or deliberately contaminated with a thumbprint and then subjected to one of 42 different cleaning procedures with the remaining carbon level monitored by x-ray p…
Abstract The effects of the blend ratio, reactive compatibilization, and dynamic vulcanization on the dynamic mechanical properties of high‐density polyethylene (HDPE)/ethylene vinyl acetate (EVA) blends have been analyzed at different temperatures. The storage modulus of the blend decreases with an increase in the EV…
Abstract Polystyrene (PS)/organophilic montmorillonite (OMMT) clay nanocomposites were prepared by a solvent casting method using chloroform as a cosolvent. Intercalation of the OMMT in the PS matrix was achieved as revealed by X‐ray diffraction. The IR spectra of the products indicated that the OMMT is homogeneously…