Materials Literature
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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…
The synthesis, crystal structure, and characterization of a non-centrosymmetric oxide, TeSeO4, are reported. The material was synthesized by combining TeO2 and SeO2 in a quartz tube and heating at 370 degrees C. TeSeO4 has a three-dimensional structure containing [SeO(3/2)](+) cations linked to [TeO(5/2)](-) anions. B…
Several mechanisms for the peroxide oxidation of organosilanes to alcohols are compared by quantum chemical calculations, including solvation with the PCM method. Without doubt, the reaction proceeds via anionic, pentacoordinate silicate species, but a profound difference is found between in vacuo and solvated reactio…
Enantiomeric poly(lactide)s were assembled on a quartz crystal microbalance (QCM) substrate, which detects the mass of the polymers from the frequency shift, following immersion of QCM into alternating acetonitrile solutions. A quantitative QCM analysis at each step and a differential scanning calorimetric study of th…
The morphological changes during the quasi-isothermal melt crystallization of a linear polyethylene sample at 126 °C were monitored by synchrotron WAXD and SAXS and compared to TMDSC data. A blocklike temperature-profile with an amplitude of 1 °C and a period of 2 min was applied. AFM at room temperature reveals lamel…
We have studied the characteristic features of viscoelastic phase separation in three dimensions by using numerical simulations, focusing on the morphological development. The Langevin-type equations of a two-fluid model, which includes both bulk and shear viscoelastic stresses, are solved numerically. The origin of p…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEnhanced Triple Helix Stability of Collagen Peptides with 4R-Aminoprolyl (Amp) Residues: Relative Roles of Electrostatic and Hydrogen Bonding EffectsI. Ramesh Babu and Krishna N. GaneshView Author Information Division of Organic Chemistry (Synthesis) National Chemical…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.Synthesis of Novel Expanded Calixphyrins: Anion Binding Properties of a Calix[6]phyrin with a Deep CavityChristophe Bucher, Rebecca S. Zimmerman, Vincent Lynch, Vladimir Král, and Jonathan L. Sessler…
Dry reverse micelles of the anionic twin-tailed surfactant bis(2-ethylhexyl) sulfosuccinate (AOT) dissolved in nonpolar solvents spontaneously form an organogel when p-chlorophenol is added in a 1:1 AOT:phenol molar ratio. The solvents used were benzene, toluene, m-xylene, 2,2,4-trimethylpentane (isooctane), decane, d…
Thermogravimetry has been used to study the kinetics of the thermal dissociation of solid and liquid ammonium nitrate. Model-fitting and model-free kinetic methods have been applied to the sets of isothermal and nonisothermal measurements to derive kinetic characteristics of the processes. The application of the model…
Homopolymer and block amphiphilic polymer brushes on silicon wafers have been successfully prepared by combining the self-assembled monolayer of initiator and atom transfer radical polymerization (ATRP). Two methods for self-assembly of initiator monolayer were compared: One was to treat the silicon surface with 6-((2…