Materials Literature
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Nanoparticle vesicles were spontaneously assembled from homopolymer polyamine polyelectrolytes and water-soluble, citrate-stabilized quantum dots. The further addition of silica nanoparticles to a solution of quantum dot vesicles generated stable micrometer-sized hollow spheres whose walls were formed of a thick, inne…
Novel self-reproducing giant vesicles, consisting of a vesicular amphiphile with an imine group in its hydrophobic chain, were constructed. This vesicular amphiphile, the product of a dehydrocondensation reaction between amphiphilic aldehyde and a lipophilic aniline derivative, could be prepared within the giant vesic…
The chemical structure, synthesis, morphology, and properties of polyurethane elastomers are briefly discussed. The current understanding of the effect of chemical structure and the associated morphology on the stability of polyurethanes in the biological environments is reviewed. The degradation of conventional polyu…
Multilayer ultrathin films composed of exfoliated nanosheets of manganese oxide and poly(diallyldimethylammonium) (PDDA) ions have been fabricated onto various substrates via electrostatic self-assembly technique. Dense monolayer coverage of the substrate surface by the nanosheets was confirmed by atomic force microsc…
It is shown that argon adsorption at 77 K is convenient for the elucidation of pore connectivity in ordered materials with large cagelike mesopores and is capable of providing valuable structural information that may not be available from commonly used nitrogen adsorption at 77 K. The discussed approach is based on th…
Cyanated perylene-3,4-dicarboximides and perylene-3,4:9,10-bis(dicarboximide)s absorb strongly in the visible spectrum and are strong oxidants. The stable radical anions of these molecules form reversibly and are also chromophores. These molecules significantly expand the library of perylene derivatives that can be em…
In this letter we investigate the quantum dynamics of a quasiparticle in the presence of a charged screw dislocation submitted to a uniform magnetic field. Analysing the quantum scattering for this quasiparticle we observed the appearance of a topological quantum phase in the solution and demonstrate that this phenome…
he structural, transport, magnetic and optical properties of the double perovskite $A_2$CrWO$_6$ with $A=\text{Sr, Ba, Ca}$ have been studied. By varying the alkaline earth ion on the $A$ site, the influence of steric effects on the Curie temperature $T_C$ and the saturation magnetization has been determined. A maximu…
A narrow-gap ferromagnetic In1−xMnxSb semiconductor alloy was grown by low-temperature molecular-beam epitaxy on CdTe/GaAs hybrid substrates. Ferromagnetic order in In1−xMnxSb was unambiguously established by the observation of clear hysteresis loops both in direct magnetization measurements and in the anomalous Hall…
Based on the conventional energy band theory, an approach is presented to describe the electronic structure of crystalline insulators in the presence of a finite homogeneous electric field. The expression of polarization is derived which extends the ``Berry-phase'' theory of polarization to nonzero fields. The charact…
Thermal properties - specific heat and heat conductivity coefficient—of polycrystalline BaTiO 3 films on massive substrates were studied as a function of the temperature and the film thickness by the ac-hot probe method. The anomalies of specific heat with the film thickness decreasing from 1100 to 20 nm revealed the…
The explicit dispersion equation for a one-dimensional periodic structure with alternative layers of left-handed material (LHM) and right-handed material (RHM) is given and analyzed. Some unusual phenomena such as spurious modes with complex frequencies, discrete modes and photon tunneling modes are observed in the ba…
We consider a possibility to create a metamaterial with nonlinear magnetic response in the microwave frequency range. Such a metamaterial is a regular periodic three-dimensional-array of resonant conductive elements with diodes as nonlinear insertions. We calculate the arising quadratic nonlinear susceptibility and sh…
Abstract Heat is transported by phonons through dielectric solids such as ceramics and organic insulating resins. Especially in organic insulating resins, phonons scatter intensely mainly by their amorphous structure, which affects their thermal conductivities, usually 1 to 3 orders lower than those of ceramics and me…
The phase behavior of the binary system consisting of the commercial nucleating and clarifying agent 1,3:2,4-bis(3,4-dimethyldibenzylidene)sorbitol (DMDBS, Millad 3988) and isotactic polypropylene ( i -PP) was investigated over the entire concentration range by means of differential scanning calorimetry (DSC), rheolog…
We report on fabrication and electrical characteristics of ZnO nanorod Schottky diode arrays. High quality ZnO nanorods were grown for the fabrication of the Schottky diodes using noncatalytic metalorganic vapor phase epitaxy and Au was evaporated on the tips of the vertically well-aligned ZnO nanorods. I–V characteri…
A gas sensor, fabricated by the simple casting of single-walled carbon nanotubes (SWNTs) on an interdigitated electrode (IDE), is presented for gas and organic vapor detection at room temperature. The sensor responses are linear for concentrations of sub ppm to hundreds of ppm with detection limits of 44 ppb for NO 2…
Tetra(carboxamido)perylen-Farbstoffe können nach einer allgemeinen Methode synthetisiert werden. In DMSO bildet Derivat A nanokristalline Aggregate, deren photophysikalische Eigenschaften sich signifikant von denen des Monomers unterscheiden (siehe Bild). Die Struktur der Aggregate wurde rasterkraftmikroskopisch unter…
Siliciumoxidnitride sind durch Einführung von NHx-Spezies in mesoporöses Siliciumdioxid zugänglich. Die basischen Zentren dieser Materialien erwiesen sich als effiziente Katalysatoren für Knoevenagel-Kondensationen (siehe Bild). Durch ihre große Oberfläche und Poren sind die hochgeordneten mesoporösen Oxidnitride eine…
In the framework of solvent diffusion in glassy polymer films, this paper concerns an experimental study of sorption and desorption kinetics for a model system consisting of statistical PMMA/PnBMA copolymer films of various composition. The experimental results are obtained by performing differential increasing and de…