Materials Literature
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Amorphous silicon quantum dots ( $a\ensuremath{-}\mathrm{Si}$ QDs) were grown in a silicon nitride film by plasma enhanced chemical vapor deposition. Transmission electron micrographs clearly demonstrated that $a\ensuremath{-}\mathrm{Si}$ QDs were formed in the silicon nitride. Photoluminescence and optical absorption…
We report on the magnetic properties of an oxide-diluted magnetic semiconductor (DMS), Zn0.64Mn0.36O. The temperature dependence of the magnetization shows a spin-glass behavior with the large magnitude of the Curie–Weiss temperature, corresponding to a stronger antiferromagnetic exchange coupling than other II–VI DMS…
Alternation of melting points in the series of odd- and even-numbered monoacid triacylglycerols has been known for a long time, but hitherto little experimental evidence has been available to support existing theories. In this paper the melting point alternation of β-C n C n C n -type triacylglycerols is discussed, ba…
The new pnictide oxide Sr 2 MnZn 2 As 2 O 2 is reported. The crystal structure of this compound consists of a 1:1 intergrowth of square-planar MnO 2 2 - layers and ThCr 2 Si 2 -type Zn 2 As 2 2 - layers interspersed by Sr cations. This compound has been prepared by sintering the stoichiometric ratio of SrO, Mn, Zn, an…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFormation of Unsymmetrical Polyoxotungstates via Transfer of Polyoxometalate Building Blocks. NMR Evidence Supports the Kinetic Stability of the Pentatungstate Anion, [W5O18]6-, in Aqueous SolutionNebebech Belai, Masahiro Sadakane, and Michael T. PopeView Author Inform…
Both polymer blends and diblock copolymers have been investigated with small-angle neutron scattering (SANS) in varying temperature and pressure fields. Four samples were studied: a polymer blend of near critical composition and the corresponding symmetric diblock copolymer of poly(ethylethylene) (PEE) and poly(dimeth…
In the present work, a generalization of some of the interpretations of heterogeneous catalysis to the case of oxide film electrocatalysts has been attempted, using conductive boron-doped diamond supports. The very high stability of this material allowed the study of the catalytic properties of noble-metal oxide modif…
Synthesis, structural, and spectroscopic characterization of the linear cationic complex [LCr(III)(mu-[dmg)(3)Zn(II))Cr(III)L](2+) (1) in which L = 1,4,7-trimethyl-1,4,7-triazacyclononane and dmg is the dimethylglyoximato anion are reported. The Cr...Cr distance of 1 is 7 A. SQUID magnetic susceptibility measurements…
The formation rate of porous silicon by photoelectrochemical etching of n -type silicon is measured in situ by a novel technique. The reflection of the laser beam used to drive the reaction contains circular patterns, the outer radius of which bears a linear relationship to the depth of etching. The use of the radius…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTImproved Synthesis of Indolyl FulgidesCraig J. Thomas, Mason A. Wolak, Robert R. Birge, and Watson J. LeesView Author Information Department of Chemistry and W. M. Keck Center for Molecular Electronics, Syracuse University, Syracuse, New York 13244-4100 [email protected]Cite th…
A general equation, obtained from the classical TPD theory and statistical thermodynamics, has been designed for determining the enthalpy of adsorption, Δ H, from a series of temperature-programmed desorption (TPD) runs carried out with various sample masses, heating rates, or inert gas flow rates. This equation appli…
Five isostructural compounds, K 1.25 Pb 3.5 Bi 7.25 Se 15 ( I ), K 1.46 Sn 3.09 Bi 7.45 Se 15 ( II ), Rb 1.45 Pb 3.1 Sb 7.45 Se 15 ( III ), K 1.45 Pb 3.1 Sb 7.45 Se 15 ( IV ), and K 2.15 Pb 1.7 Sb 8.15 Se 15 ( V ) were prepared by the molten flux method as silver rodlike air-stable crystals. They all crystallize in th…
A new low band gap conducting polymer, poly(2-decylthieno[3,4- b ]thiophene-4,6-diyl) ( 5 ), predicted to have nearly equi-energetic aromatic and quinonoidal forms, was synthesized by a multistep sequence involving FeCl 3 polymerization of 2-decylthieno[3,4- b ]thiophene ( 7 ) and studied. A film of 5 showed a vis−NIR…
The photophysical properties of Rh(2)(O(2)CCH(3))(4)(L)(2) (L = CH(3)OH, THF = tetrahydrofuran, PPh(3) = triphenylphosphine, py = pyridine) were explored upon excitation with visible light. Time-resolved absorption shows that all the complexes possess a long-lived transient (3.5-5.0 micros) assigned as an electronic e…
The nonlinear dynamic response of polymer melt brushes to large amplitude oscillatory shear is studied using melt state rheology of end-tethered polymer layered−silicate nanocomposites. These model melt brushes exhibit reversible strain hardening at moderate strain amplitudes, characterized by the presence of a critic…
The miscibility of random fluorinated tetrafluoroethylene copolymers is investigated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). In particular, mixtures composed of poly(tetrafluoroethylene)- co -(hexafluoropropylene) (FEP) containing 1 mol % of comonomer and poly(tetrafluoroethylene)- co -…
The interface in composite materials containing an ultrathin layer of poly(methyl acrylate)-d(3) (PMA-d(3)) on silica was studied using deuterium NMR. PMA-d(3) was deposited from solution at saturation coverage from toluene onto silica. The samples were dried and composite samples made by hot pressing the PMA-d(3)/sil…
We describe the structure and dynamical behavior of a homogeneous mixture of hairy nanospheres, i.e., polyorganosiloxane microgels grafted with polystyrene chains, and linear polystyrene chains. Previously, it has been found that such mixtures are only homogeneous if the molecular weight of the polymer hairs is at lea…
Acid−base properties of alumina-supported rare-earth oxides (Ln/Al 2 O 3; Ln = La, Ce, Eu, Tb, and Yb) were investigated with α-pinene isomerization, 2-butanol decomposition, and temperature-programmed desorption and FTIR techniques. The structural characterization was carried out by means of XRD, Raman, and XAFS spec…
New Dion−Jacobson-type layered perovskite oxyfluorides, ASrNb 2 O 6 F (A = Li, Na, and Rb), have been prepared by conventional solid-state reaction, and their fluorine distribution in an anion sublattice was studied by performing 19 F MAS NMR spectroscopic analyses and lattice energy calculations to probe the evolutio…