Materials Literature
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Abstract The Raman and infrared spectra of vanadinite [Pb 5 (VO 4 ) 3 Cl] specimens from three localities were studied. Raman spectra were found to be both orientation and temperature dependent. Measurement of the Raman spectra at liquid nitrogen temperature allowed better band separation and increased the intensities…
Polymeric micelles composed of block copolymers of poly(l-lactide) (PLLA)/poly(ethylene glycol) (PEG) of which end was modified with a novel pH sensitive element of a sulfonamide, sulfadimethoxine (SD; pKa 6.1), or a polymer (PSD; Mw: 3000) of its derivative were investigated. PSD was synthesized by radical polymeriza…
A new 1,10‐phenanthroline‐containing π‐conjugated polymer, the color of which can be tuned from blue to red by metal complexation, has been synthesized. The polymer responds sensitively to various metal ions due to its high coordinating ability, and the Figure shows emission from the polymer–metal complexes under 365…
Carbon capsules with hollow cores and mesoporous shells (HCMS) containing entrapped Au particles were prepared by template replication from solid core/mesoporous shell silica spheres with encapsulated Au particles. The resulting HCMS carbon capsules were then nanocast one step further to generate Au-trapping hollow co…
The reverse micelle technique , here used to synthesize divanadium pentoxide nanorods, enables the nanorod length to be tuned easily by simply keeping them in the micellar solution after the synthesis. The nanorods are characterized by transmission electron microscopy, X‐ray photoemission spectroscopy, and X‐ray diffr…
Thermally stable mesoporous core-shell structured titania microspheres with well-defined hollow interiors were directly prepared by a novel hydrothermal precipitation of TiCl4 in the presence of urea and ammonium sulfate.
Abstract A pentadentate phenol‐containing ligand (H 3 L) with N 2 O 3 donor atoms yields Ni II 2 ( 1 ), Ni II 4 ( 2 ), Cu II 2 ( 3 ) and Cu II 4 ( 4 ) complexes, which have been structurally characterized by X‐ray diffraction. Complex 1 contains a single‐atom O ‐bridged urea. The compounds were characterized by IR, UV…
Mimicking the texture and anisotropy of the template, birefringent conducting polymer films (see picture) have been obtained by electropolymerization of 3,4-ethyldioxythiophene (EDOT) within a hexagonal lyotropic liquid crystal. Using a self-assembled template to control molecular orientation in conducting polymers co…
Not π stacking but CH⋅⋅⋅π-ring center interactions lead to the fluorescence emission observed for the first time from a heteromolecular excimer complex. In single crystals a toluene molecule is located perpendicular to a Ph2P(S)-disubstituted anthracene chromophore. This toluene complex fluoresces (see picture) but t…
Because of their potential to reduce the environmental impact and geopolitical consequences of the use of fossil fuels, fuel cells have emerged as tantalizing alternatives to combustion engines. Like a combustion engine, a fuel cell uses some sort of chemical fuel as its energy source but, like a battery, the chemical…
Poly(vinylalkohol), ein inhärent amphiphiles Material, kann nach Abscheidung auf einer Aluminiumoxidmembran in Form von Nanofasern (siehe Bild) als superhydrophobe Oberfläche wirken. Die Anordnung der hydrophoben und hydrophilen funktionellen Gruppen sowohl auf der Oberfläche als auch innerhalb des Materials hat einen…
Abstract Depolymerization of poly(ethylene terephthalate) waste (PETW) was carried out by methanolysis using zinc acetate in the presence of lead acetate as the catalyst at 120–140 °C in a closed batch reactor. The particle size ranging from 50 to 512.5 µm and the reaction time 60 to 150 min required for methanolysis…
The magnetization reversal and dynamics of a spin valve pillar, whose lateral size is 64$\times$64 nm$^2$, are studied by using micromagnetic simulation in the presence of spin transfer torque. Spin torques display both characteristics of magnetic damping (or anti-damping) and of an effective magnetic field. For a ste…
The continuum theory of partially fluidized shear granular flows is tested and calibrated using two dimensional soft particle molecular dynamics simulations. The theory is based on the relaxational dynamics of the order parameter that describes the transition between static and flowing regimes of granular material. We…
We present a theoretical analysis and numerical simulations of lateral current density fronts in bistable resonant-tunneling diodes with Z-shaped current-voltage characteristics. The bistability is due to the charge accumulation in the quantum well of the double-barrier structure. We focus on asymmetric structures in…
Low temperature specific heat $C(T)$ and zero-field muon spin resonance ($μ^+$SR) measurements were performed in Gd(hfac)$_3$NITiPr, a quasi one-dimensional molecular magnet with competing nearest neighbor and next-nearest neighbor intrachain exchange interactions. The specific heat data exhibit a $λ$-peak at $T_0$=2.…
In many situations the process of crystallisation from solution is known to occur via metastable crystalline states (polymorphs or solvates). Here we present what we believe to be a novel example of small molecule crystallisation in which the initial separation of a solute rich liquid phase precedes the crystallisatio…
Metal nanorods and nanowires (see Figure) have been synthesized using multiwalled carbon nanotubes (MWCNTs) as templates and supercritical CO 2 as the reaction medium. This rapid, direct, and clean approach can also be used to fabricate other metal/CNT composites and to coat the CNTs with metal films or nanoparticles.
Several alternative possibilities of how to create an electromagnetic device being able to reconstruct near-field distribution of a source with sub-wavelength resolution (so-called perfect lens) are considered. It is shown that there is a variety of such means not involving double-negative (left-handed, or Veselago) m…
We have examined the electrical transport in disordered molecular solids. It has been found that mobility is a function of electric field and temperature due to hopping conduction. Several theoretical models for charge transport in disordered solids have been debated over the role of spatial and energetic correlation…