Materials Literature
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Lanthanide-doped RbY 2 F 7 nanocrystals with a mean diameter of approximately 10 nm were synthesized at 185 °C in the high boiling organic solvent N -(2-hydroxyethyl)-ethylenediamine (HEEDA) using ammonium fluoride, rare earth chlorides, and a solution of rubidium alkoxide of N -(2-hydroxyethyl)-ethylenediamine in HEE…
Currently, we witness a fabulous revival of blue phases. For many years, the small temperature range of blue phase stability in traditional systems seemed to restrict the extremely interesting research on these defect structures to purely academic questions. But the dramatically extended stability range in polymer-sta…
The thermoelectric properties of inclinedly oriented thin films of layered cobaltite Ca x CoO 2 have been investigated in response to infrared lamp heating. Upon heating the film surface, anisotropic voltage signals were identified along the film in-plane directions, which showed a close relation to the inclined cryst…
Abstract Melt polycondensation was used to prepare a systematic series of random and amorphous copolyesters using the following cycloaliphatic diesters: dimethyl‐1,4‐cyclohexane dicarboxylate (DMCD), dimethyl bicyclo[2.2.1]heptane‐1,4‐dicarboxylate (DMCD‐1), dimethyl bicyclo[2.2.2]octane‐1,4‐dicarboxylate (DMCD‐2), di…
With ultrafast electron microscopy (UEM), we report observation of the nanoscopic crystallization of amorphous silicon nitride, and the ultrashort optomechanical motion of the crystalline silicon nitride at the interface of an adhering carbon nanotube network. The in situ static crystallization of the silicon nitride…
Abstract The oxidative/hydrolytic stability of polyurethanes (PUs) containing exclusively polyisobutylene (PIB), or mixed PIB/polytetramethylene oxide (PTMO), or mixed PIB/polyhexamethylene carbonate (PC) soft segments was investigated. The tensile strengths and elongations of various PUs were determined before and af…
Abstract Y 2 Si 2 O 7 is an intriguing material combining a complex structural polymorphism with several important technological applications. Raman spectra were experimentally determined for most of the seven known modifications of Y 2 Si 2 O 7 except the form ε, and in the case of β, γ, δ and ζ for the first time. T…
Spectral fluctuations observed in single CdSe/ZnS nanocrystals at 5 K are found to be entirely the result of discrete charge hops in the local environment of the nanocrystal, which occur at a rate comparable to the acquisition time of a single spectrum. We show that intervals between discrete spectral hops introduce a…
Getrennt und wieder vereint: Die Gegenwart einer Lewis-Base nimmt Einfluss auf die kooperative Selbstorganisation von Zinkporphyrinen. Die Bindung eines solchen axialen Liganden durch das Monomer führte zu einer Depolymerisation von Porphyrinaggregaten, doch bei Verdünnung kam es zur erneuten Aggregation. Theoretische…
Abstract A facile way for the synthesis of hyperbranched poly(4‐chloromethylstyrene) [P(4‐CMS)] with adjustable molar mass by classic atom transfer radical polymerization (ATRP) and mechanistically similar procedures is presented. Subsequently, the chlorine functional groups have been modified to obtain polymers with…
There has been an increased attention to explore the possibility of using polymer materials with rare-earth (RE) metal ions and their complexes as potential optical materials due to their capability of exhibiting novel and unusual properties. The fluorescence characteristics of polymer systems doped with RE metal ions…
Abstract This work reports the surface‐initiated atom transfer radical polymerization (ATRP) from hydrogen plasma‐treated porous poly(tetrafluoroethylene) (PTFE) membranes using the CF groups as initiators. Hydrogen plasma treatment on PTFE membrane surfaces changes their chemical environment through defluorination a…
The synthesis, structure, and magnetochemical characterization of the largest manganese oxime cluster are reported. The Mn(15)/2-pyridinealdoxime compound is mixed-valence (II/III) and possesses an irregular structural motif with a novel Mn/O core. The oximato-bridged cluster exhibits an S = 6 ground state and a negat…
A parametric study of a solid oxide fuel cell-gas turbine (SOFC-GT) hybrid system design is conducted with the intention of determining the thermodynamically based design space constrained by modern material and operating limits. The analysis is performed using a thermodynamic model of a generalized SOFC-GT system whe…
Abstract Three phosphanes containing azobenzene groups were synthesized, and the photochemical behaviour of their platinum complexes was studied by using the light‐induced ( E )/( Z ) isomerization as a switch to change ligand properties.
We report a simple evaporation process using liquid marbles as precursors to produce high sphericity, precisely diameter controlled polyelectrolyte microspheres. We use poly(diallyldimethylammonium chloride) (PDDA) as the test polyelectrolyte for this experimental study. We present measurements of the rate of mass los…
Recent statistics indicate that in 2005 the world consumed about 0.5 ZJ (ZJ = 1021 Joules) of energy. If one assumes that the future world population stabilizes at 10 billions, and the people consume a similar amount of energy per capita to that of the people in the presently developed countries, the world will need a…
We calculate the electrical conductivity of single-layer graphene within the regime of massless Dirac fermions. We consider the electron-LO-phonon interactions as the dominant scattering mechanism. By using the Green's-function method, we are able to obtain the quantitative contribution from the five leading diagrams…
Core/shell CdSe-ZnS quantum dots (QDs) with a peak emission wavelength of 618 nm and size of ~ 5.5 nm were synthesized by thermal deposition approach. High photoluminescence efficiency with a quantum yield of more than 48% has been achieved. Red-shift of a peak emission wavelength from 532 to 568 nm was realized by do…
The exchange coupling observed between a soft ferromagnetic layer and the antiferromagnetic multiferroic compound ${\text{BiFeO}}_{3}$ (BFO) is investigated. Results obtained on BFO ferroelectric and antiferromagnetic multidomain films and monodomain single crystals are compared. A significant interface coupling occur…