Materials Literature
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The adsorption and electrooxidation of CO at a Ru(0001) electrode in perchloric acid solution have been investigated as a function of temperature, potential and time using in situ FTIR spectroscopy. This builds upon and extends previous work on the same system carried out at room temperature. As was observed at room t…
We have investigated the self-assembly of ultrathin zirconium coordination monomer and polymer films using a layer-by-layer approach. These materials are of great interest for incorporating metal ion (inorganic) moieties in organic (polymer) films with applications ranging from conductors to catalytic materials. The d…
Four isotypic compounds Hg3AsS4Cl, Hg3AsS4Br, Hg3AsSe4Br, and Hg3AsSe4I were synthesized in the quaternary system mercury/arsenic/chalcogen/halogen by vapor transport reactions from As, Hg(II) halide, Hg(II) chalcogenide, and elemental chalcogen at temperatures between 250 and 310 degrees C. Their structures were solv…
The synthesis of a novel biphenol from phenolphthalein that contains an anhydride group is described. The biphenol readily undergoes further reactions. Two biphenols that contain the 1,2-benzoylenebisbenzimidazole or phthaloperin-12-one moiety, respectively, were prepared from the biphenol anhydride by reaction with a…
The relationship between the spreading of antifoam oils and their performance is much discussed in the literature, but a demonstrated connection between antifoam spreading and performance has been lacking. This paper reports the performance of a poly(dimethylsiloxane) (PDMS)-based antifoam on foam produced by 12 surfa…
A poly(styrene- block -isoprene- block -styrene) (SIS) triblock copolymer with a polystyrene (PS) cylinder morphology was globally oriented via roll-casting. Transmission electron microscopy (TEM) was used to assess the quality of orientation. The roll-casting process produces films with near-single-crystal-like orien…
The Zr x Ce 1 - x (OH) 4 solids were prepared by simple precipitation of hydroxides from known solutions of ZrOCl 2 ·8H 2 O and Ce(NO 3 ) 3 ·6H 2 O in aqueous ammonium hydroxide. For x ≤ 0.5, the presence of a CeO 2 phase with a mixed Zr−Ce hydroxide has been evidenced by thermal analysis and Raman and EPR spectroscop…
Amorphous SiO2 surfaces are generated from bulk–liquid configurations using simulations employing a polarizable-ion model. The surfaces are characterized in terms of the ion environments as a function of depth into the surface. Comparison is made to previous simulation studies and subtle differences are highlighted an…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.Novel Photoisomerization of Azoferrocene with a Low-Energy MLCT Band and Significant Change of the Redox Behavior between the cis- and trans-IsomersMasato Kurihara, Takayuki Matsuda, Akira Hirooka, T…
1,2-Bis(2-ethyl-5-phenyl-3-thienyl)perfluorocyclopentene ( 1a ) was found to undergo a thermally reversible photochromic reaction in solution as well as in the single-crystalline phase. Upon irradiation with ultraviolet light the hexane or toluene solution containing 1a and single-crystal 1a turned blue along with the…
A heuristic treatment of the connectedness Ornstein–Zernike equation is developed for macromolecular fluids within the framework of the polymer reference interaction site model (PRISM). Results are presented for the critical volume fraction at the percolation threshold and for the mean number of interchain contacts pe…
The mechanism of the enzymatic degradation of poly([R]-3-hydroxybutyrate) (PHB) was investigated by using well-defined model substrates, including both linear and cyclic [R]-3-hydroxybutyrate (3HB) and [R]-3-hydroxyvalerate (3HV) oligomers, with two different PHB depolymerases. The linear and cyclic oligomers containi…
Three different lithium manganese(III) oxides (the orthorhombic LiMnO 2 phase, monoclinic layered LiMnO 2 and tetragonal Li 2 Mn 2 O 4 ) were studied with 6 Li magic-angle spinning (MAS) NMR spectroscopy. Much smaller shifts of 36−143 ppm are observed for the Mn(III) phases, in comparison to the other lithium manganes…
We show that the emeraldine base form of polyaniline (PANI) forms self-organized (mesomorphic) structures upon mixing with an amphiphilic oligomer zinc dodecyl benzenesulfonate, Zn(DBS) 2 . The number of Zn(DBS) 2 molecules vs the number of PhN repeat units of PANI was selected to be x = 0, 0.125, 0.25, 0.5, and 1.0,…
The oxidation state of Cu species dispersed in a Cu-ZSM-5 zeolite obtained by a nonconventional gas-phase CuCl exchange, and nominally containing only Cu(I) species, was studied by x-ray photoelectron spectroscopy (XPS) and x-ray absorption near edge structure (XANES) analyses. The oxidation of Cu(I) species to Cu(II)…
An alternating deposition film of a copolymer of p -(hexaflouro-2-hydroxylisopropyl)-α-methylstyrene and styrene (PSOH) and poly(4-vinylpyridine) (PVP) was fabricated on the basis of hydrogen bonding between hydroxyl and a pyridine ring in chloroform. It is found that the selection of solvent is very important for suc…
A simple theoretically motivated model to extrapolate the correlation energy based on correlation-consistent polarized X-tuple basis sets is suggested. It has the form EXcor=E∞cor[1+A3 X−3(1+A4 X−1)], where EXcor is the energy for the X-tuple basis set, E∞cor and A3 are parameters to be determined from a set (Xmin−Xma…
Electrostatic layer-by-layer thin films may be directed to specific regions of a surface based on electrostatics, secondary interactions, and steric repulsion. In this study, a series of polyamines ranging from hydrophobic polyallylammonium hydrochloride (PAH) to hydrophilic linear polyethyleneimine (LPEI) were coadso…
Viscosity measurements in a broad temperature range display a variation over 11 orders of magnitude and show a crossover at about T+=285 K, comparable with dielectric results from a Stickel evaluation. The index R, i.e., the product of dielectric loss peak maximum frequencies times the viscosity, divided by temperatur…
Periodic mesoporous organosilicas with two-dimensional and three-dimensional hexagonal as well as cubic ( Pm 3 n ) symmetry were synthesized using bridged silsesquioxane species (RO) 3 Si−CH 2 −CH 2 −Si(RO) 3 as precursors and cetyl- or octadecyltrimethylammonium chloride (C 16 TMACl or C 18 TMACl) as structure-direct…