Materials Literature
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The origin of the considerable thickness of the 90-degree head-to-tail domain wall in BaTiO 3 is discussed in the framework of the phenomenological Ginzburg-Landau-Devonshire theory. For this purpose, domain wall widths of 90-degree and 180-degree domain walls in BaTiO 3 and PbTiO 3 are compared. It is argued that the…
Abstract Ionic liquid, 1‐butyl‐3‐methylimidazolium chloride ([BMIM]Cl), was used as solvent for the polymerization of acrylonitrile (AN) and the resulting polymer solution was directly applied for spinning to produce polyacrylonitrile (PAN) fiber for the first time. Acrylic polymers with high content of AN, large mole…
Porous titania beads were synthesized by a sol−gel templating method using agarose gel as template. The morphology and structure of the materials were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and N 2 adsorption analysis, etc. It was found that…
Thermal and electrical conductivities in composites (CMs) based on various types of polymer matrix – epoxy resin (epoxy) and polyethylene oxide (PEO) have been investigated in the temperature range 150–300 K. A few types of carbon materials have been used as a filler in CMs: thermoexfoliated graphite (TEG) (TEG conten…
Thin liquid foam films stabilized with the addition of a temperature-sensitive neutral polymer, poly(N-isopropylacrylamide) (PNIPAM), in the presence of varying amounts of an anionic surfactant, SDS, were investigated using the thin-film balance. Data were analyzed in light of new and previously reported neutron refle…
End-tethered cationic polypeptide brushes of poly(L-lysine) (t-PLL) were combined with three anionic polymers, poly(acrylic acid) (PAA), poly(L-glutamic acid) (PLGA), and poly(L-aspartic acid) (PLAA), to form reversible polyelectrolyte complex films at surfaces at neutral pH. The polyelectrolyte complex formation was…
We demonstrate that left-handed resonance transmission from metallic metamaterial, composed of periodically arranged double rings, can be extended to visible spectrum by introducing an active medium layer as the substrate. The severe ohmic loss inside metals at optical frequencies is compensated by stimulated emission…
Landau-Ginzburg-Devonshire type phenomenological models have been widely used to study ferroelectric phase transitions and domain pattern formation. By including time variation, such models become the time dependent Ginzburg-Landau (TDGL) theory, which may be used to study the kinetics of domains and predicting time v…
Structural transformations in extended solids result from local atomic rearrangements and phase growth mechanisms. A broad class of technologically relevant properties critically depends on local structural issues connected with domain sizes, domain boundary geometries, and defects. However, a precise understanding of…
Als optische Sensoren für biokatalytische Prozesse, die unter Beteiligung NAD+-abhängiger Enzyme ablaufen, und, durch Aufzeichnung des intrazellulären Stoffwechsels, zum Screening von Tumortherapeutika dienen CdSe/ZnS-Quantenpunkte, die mit NAD(P)H-sensitivem Nilblau funktionalisiert sind.
Water-medium clean organic reactions including isomerization and hydrogenation were carried out over a Ru(II) mesoporous organometallic catalyst (Ru-MOC) synthesized based on surfactant-directed coassembly of a bridged Ru(II) organometallicsilane and tetraethoxysilane. Owing to the large surface area, the ordered meso…
The IVA group metal Pb was found to be an efficient catalyst for the chemical vapor deposition (CVD) growth of single-walled carbon nanotubes (SWCNTs) under suitable conditions. Especially the volatility of Pb made it feasible to realize the direct growth of SWCNTs with no metallic catalyst residues. Three methods inc…
The precipitate formed by the addition of an aqueous solution of Co(NO 3 ) 2 and Al(NO 3 ) 3 to LiOH solution has been thoroughly studied as a function of the Al:(Al+Co) ratio, z, for 0 ≤ z ≤ 1, using X-ray diffraction and thermogravimetric analysis. For 0 ≤ z ≤ 0.2, the precipitate was a mixed phase of Co(OH) 2 and t…
BaF2fled no more: Monodisperse cubic- and orthorhombic-phase BaF2 nanocrystals were formed readily by the liquid–solid–solution approach. Nucleus growth of BaF2 occurs under kinetic control, whereby their size and morphology depend greatly on the ripening time and concentration of surfactants (see scheme). The phase o…
A novel, facile modified hydrothermal reaction route to nearly free-standing lead zirconate titanate (PZT) particles is presented. Simple mixing of fresh coprecipitates and mineralizer KOH followed by a hydrothermal treatment at 200 °C, produced PZT nanoparticles. Mineralizer KOH plays an important role in the size co…
The liquid crystal phase diagram of the discotic hard spherocylinder fluid is investigated by Monte Carlo simulations. Thickness-to-diameter aspect ratios within L/D=0.2-0.5 are considered. Three distinct columnar phases are found, namely, a hexatic interdigitated phase (D(hi)), a hexatic ordered phase (D(ho)), both w…
The electronic structures of undoped and fluorine-doped LaFeAsO superconductors and fluorine-doped SmFeAsO superconductors are studied using soft x-ray absorption and emission spectroscopy combined with full potential linearized augmented planes waves (FP LAPW) calculations. The comparison between the numerical simula…
Environment-induced effects on the E 2G G-band and A 1 ′ 2D-band Raman spectral features of single-layer graphene provide insights on the intrinsic and extrinsic dependences of the phonon energy and line width on temperature. Graphene prepared via mechanical exfoliation in air exhibits a G-band line width that increas…
We investigated the recently found superconductor ${\text{LaFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ by x-ray absorption spectroscopy. From a comparison of the $\text{O}\text{ }K$ edge with LDA calculations we find good agreement and are able to explain the structure and changes in the spectra with electron doping. F…
Double-sided comb-like ZnO nanoferns have been successfully synthesized via a one-step hydrothermal synthesis without using any catalysts or templates. Their structure and morphology were characterized by scanning electron microscopy, transmission electron microscopy, and Fourier fast transformation technique. A possi…