Materials Literature
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The dipole polarizabilities, second-order polarizabilities, and origin of second-order nonlinear optical (NLO) properties of trisorganotin-substituted beta-Keggin polyoxotungstate [XW9O37(SnR)3](11-n)- (X = P, Si, Ge, R = Ph; X = Si, R = PhNO2, PhCCPh) have been investigated by using time-dependent density functional…
The piezoelectric properties of {001} oriented 0.5Pb(Yb1∕2Nb1∕2)O3–0.5PbTiO3 films were studied. It was found that the films show Rayleigh-like behavior in that the magnitude of the piezoelectric coefficient depends linearly on the amplitude of the exciting ac electric field used for the measurement. The reversible an…
Sol-gel process was adopted to prepare BiFeO3 films. Pure phase BiFeO3 films were deposited on LaNiO3 coated Si (111) substrates at various annealing temperatures of 450–600°C. The films annealed at 450–600°C are (110) and (1̱10) biaxis preferential oriented. Below 550°C, the remnant polarization increases with the an…
Abstract Summary: Molecular dynamics simulations of a coarse‐grained bead‐spring model of flexible macromolecules tethered with one end to the surface of a cylindrical pore are presented. Chain length N and grafting density σ are varied over a wide range and the crossover from “mushroom” to “brush” behavior is studied…
We determine the phase diagram of ${\mathrm{Ni}}_{2+x}{\mathrm{Mn}}_{1\ensuremath{-}x}\mathrm{Ga}$ as a function of $x$ $(0<x\ensuremath{\leqslant}0.35)$ from ac susceptibility and differential scanning calorimetry (DSC). Total energy and density of states calculated using the ab initio full potential linearized pl…
Abstract A series of novel dendritic carbazole‐based porphyrins [T(Cz‐G n )Ps] have been synthesized by a combination of Ullmann coupling and Adler condensation reactions and their intramolecular energy‐transfer properties have been studied by absorption and steady‐state fluorescence spectroscopy. It has been found th…
Ceramics with zero thermal expansion coefficients at room temperature (293K) were investigated. We found the thermal expansion coefficient was controlled by a compounding ratio of lithium aluminum silicate (LAS) and silicon carbide (SiC), which have negative and positive thermal expansion coefficients respectively. Al…
We report on the temperature dependence of the intrinsic resistance of long individual disordered single-wall carbon nanotubes. The resistance grows dramatically as the temperature is reduced, and the functional form is consistent with an activated behavior. These results are described by a Coulomb blockade along a se…
Abstract The thermal stabilities, mechanical properties, and morphologies of nanocomposites of poly(ethylene terephthalate) (PET) with two different organoclays are compared. Dodecyltriphenylphosphonium‐montmorillonite (C 12 PPh‐MMT) and dodecyltriphenylphosphonium‐mica (C 12 PPh‐Mica) were used as reinforcing fillers…
The corrosion behaviors of Ln2Si2O7 (Ln=Yb and Lu) and ASiO4 (A=Ti, Zr and Hf) EBC's were examined at 1500oC in water vapor environment. These oxides were coated on silicon nitride specimens by oxidation-bonded reaction sintering technique. Among Ln2Si2O7 system, though the thermal expansion coefficient of Yb2Si2O7 ph…
As-doped p-type ZnO films were grown on GaAs by sputtering and thermal diffusion process. Hall effect measurements showed that the as-grown films were of n-type conductivity and they were converted to p-type behavior after thermal annealing. Moreover, the hole concentration of As-doped p-type ZnO was very impressible…
Density functional theory (DFT) quantum chemical calculations are used to determine adsorption energies and geometries of NO, NO(2), CO(2), and H(2)O on a barium oxide (100) surface. The study includes two adsorption geometries for NO(2). All species form thermodynamically stable adsorbates, and adsorption strength in…
The electronic structure and x-ray magnetic circular dichroism (XMCD) spectra of the Heusler alloy Co2MnGe were investigated theoretically from first principles, using the fully relativistic Dirac linear muffin-tin orbital band structure method. Densities of valence states, orbital and spin magnetic moments, as well a…
Thin films with sinusoidally varying refractive index profiles display photonic band gap effects. Intentional deviations from the periodic index profile can be used to tailor the optical properties of the resulting thin film. We present experimental characterization of TiO2 films with periodic index profiles fabricate…
In order to study the pathobiological impact of the nanometre-scale of materials, we evaluated the effects of five different materials as nanoparticulate biomaterials in comparison with bulk samples in contact with living tissues. Five groups out of 10 rats were implanted bilaterally for up to 12 months with materials…
We show that chemical cross-linking of hydrogen-bonded poly(methacrylic acid)/poly(vinylpyrrolidone) (PMAA/PVPON) capsules deposited onto silica core with ethylenediamine (EDA) followed by core dissolution and pH-triggered removal of PVPON produces amphoteric hydrogel hollow capsules, whose walls are composed of cross…
A combination of Langmuir-Blodgett and Langmuir-Schaefer techniques was employed to deposit 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) bilayers at a gold electrode surface. One leaflet consisted of hydrogen-substituted acyl chains, and the second leaflet was composed of molecules with deuterium-substituted acy…
Ultrathin films of the conducting polymer system PEDOT:PSS, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), were fabricated through layer-by-layer assembly with PAH, poly(allylamine hydrochloride). A variety of grades of PEDOT:PSS were used to study the effects of the PEDOT to PSS weight ratio and particle si…
Ba Fe 12 O 19 hexaferrite thick films having high hysteresis loop squareness (Mr∕Ms) and low ferromagnetic resonance (FMR) linewidths were processed through the use of a screen printing technique coupled with hot-press sintering. Scanning electron microscopy and x-ray diffraction measurements exhibit strong crystallog…
The amphoteric nature of ZnO is used to produce the material from strongly alkaline solution. The solution pH is lowered globally to produce ZnO powder, and it is lowered locally at a Au(111) surface to produce epitaxial films. ZnO powder is precipitated from a solution of 10 mM Zn(II) in 0.25 M NaOH by simply adding…