Materials Literature
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We report a new paradigm for tuning the optical properties of gold nanorods by organizing them longitudinally, using thioalkylcarboxylic acid based bifunctional molecules. The rationale behind the selection of the bifunctional molecule is based on the fact that the thiol group binds to the ends of the nanorods, which…
A trifluoroethylester-terminal poly(ethylene glycol) (PEG) silane was synthesized and self-assembled on iron oxide nanoparticles. The nanoparticle system thus prepared has the flexibility to conjugate with cell targeting agents via either carboxylic or amine terminal groups for a number of biomedical applications, inc…
Abstract The clay mineral content of the < 2 µm fraction in tidal flat sediments in the former Harle Bay on the Lower Saxony coast has changed considerably since the thirteenth century up to the present time. The proportion of smectite has decreased from 29 to 11 wt%, whereas the proportion of illite has increased…
Abstract Planar stress distribution of cucumber fruits was visualized for four cultivars. The planer stress distribution of a cross‐sectional sample was measured using a multiple‐point sheet sensor during uniaxial compression by an Instron universal testing machine. The concentric distribution pattern of stress gradie…
Surface-specific sum-frequency vibrational spectroscopy and second-harmonic generation were used to study the structures of polyimide (PI) surfaces for homeotropic liquid crystal (LC) alignment and the molecular orientation of LC adsobates on these surfaces. The imide ring was perpendicular to the surface with one of…
The electronic structure of the protonic conductor Y-doped BaCeO 3 (BaCe 0.90 Y 0.10 O 3-δ ) has been studied by photoemission spectroscopy and X-ray absorption spectroscopy. The Fermi level ( E F ) of H 2 -annealed BaCe 0.90 Y 0.10 O 3-δ shifts to the conduction band side by approximately 0.4 eV. The holes and accept…
Field-induced changes in Brillouin scattering spectra of the PbMg1/3Nb2/3O3 relaxor ferroelectric have been examined in the vicinity of a diffuse phase transition under a dc electric field oriented along the [111] direction. It has been established that the transition into an electric-field-induced ferroelectric phase…
Abstract Summary: Polypyrrole (PPy) microtubes with an actinomorphic morphology are synthesized by a chemical method in the presence of an inclusion complex (IC) of mono [6‐deoxy‐6‐(2‐butenedinitrile‐2,3‐dimercapto sodium salt)]‐ β ‐cyclodextrin (6‐mnt‐ β ‐CD) with methyl orange (MO) as a dopant in aqueous solution. T…
Abstract The microstructure of the plasma‐polymerized methylmethacrylate (ppMMA) films is characterized using neutron reflectivity (NR) as a function of the plasma reaction time or film thickness. Variation in the crosslink density normal to the substrate surface is examined by swelling the film with a solvent, d‐nitr…
Phosphorus (P) is rapidly immobilized in Chilean volcanic soils and its availability to plant is greatly reduced. Chemical forms of P accumulated in soils would eventually determine its availability of plants and its potential to cause pollution in water bodies down stream. To characterize different chemical P species…
We report a study on the synthesis, electrical transport, and magnetic properties of Pr-doped LaMnO3 ceramic material. We have found that La1−xPrxMnO3+δ (x=0.3) synthesized using solid-state reaction shows semiconductor behavior, and no colossal magnetoresistance (CMR) effect; while it shows CMR behavior when it is an…
Abstract Pure and gallium or lanthanum substituted MgCu ferrites, Mg 0.5 Cu 0.5 Fe 2‐x M x O 4 (with x = 0 or 0.2 and M = La or Ga) have been prepared by solid state reaction. Sintering experiments were carried out at different temperatures between 900 and 1100°C. The phase composition and lattice parameters were dete…
Surface divacancy at MgO(100) and its reactivity with water are studied by first-principles simulations. Among the most frequent point defects at MgO(100), the divacancy is estimated to be stable with respect to the formation of neutral oxygen and magnesium vacancies in moderate O environments. A single water molecule…
The structural properties and lattice instabilities of perovskites in the $(\mathrm{T}\mathrm{h},\mathrm{P}\mathrm{b},\mathrm{B}\mathrm{i},\mathrm{Y}){\mathrm{ScO}}_{3}$ system are investigated by first-principles density-functional calculations with the linearized augmented plane-wave method. In all cases, Th is foun…
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The relationship between the number-average sequence length and the melting temperature of the block copolyesters prepared by quench after the transesterification reaction between poly(ethylene terephthalate) and poly(butylene terephthalate) was reported. The number-average sequence length was determined by the triad…
Electronic structures and stability of substitutional Ti3+ clusters in Al2O3 were investigated by first-principles pseudopotential calculations using large supercells. It was found that a substitutional Ti3+ defect induces an extra defect level in the band gap, and the defect levels have strong bonding interactions in…
To develop a high-performance pyroelectric infrared detector, large-size and high-quality 0.2 mol % Fe-doped Pb(Mg1/3Nb2/3)O3-0.38PbTiO3 single crystals have been grown by a modified Bridgman technique with a seed crystal. At 50 Hz, the doped single crystal showed a lower dielectric constant of 310 compared with the p…
Clay dispersion affects both soil productivity and environmental quality through its effect on structure degradation. The effect of solution concentration (C), sodium adsorption ratio (SAR), and mechanical disturbance on clay dispersion, particle size of dispersed clay and critical flocculation concentration (CFC) was…
First-principles electronic structure calculations and angle-scanned x-ray photoelectron diffraction experiments reveal the geometrical structure of the Mg(0001) surface upon oxidation. In contrast to previous studies of Mg(0001) oxidation and unlike the case of aluminum oxidation we determine a surface oxide structur…