Materials Literature
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Inorganic-organic hybrid mesoporous materials were prepared by cocrystallization of a "sandwich" type polyoxometalate, [ZnWZn2(H2O)2(ZnW9O34)2]12-, and branched tripodal organic polyammonium salts, tris[2-(trimethylammonium)ethyl]-1,3,5-benzenetricarboxylate or 1,3,5-tris[4-(N,N,N-trimethylammoniumethylcarboxyl)phenyl…
In this paper, we bring forward an effective strategy, solvothermal postsynthesis, to prepare ordered mesoporous silica materials with highly branched channels. Structural characterizations indicate that the titled mesoporous materials basically have the cubic double gyroidal (space group Ia-3d) structure with small f…
Abstract Creep resistant magnesium alloys are candidate materials for automotive powertrain applications. Since the 90's, a number of new creep‐resistant magnesium alloy systems have been investigated and developed. These are for the most part based on rare‐earth, alkaline earth, and silicon additions. This paper give…
Quantum dots having four different surface coatings were tested for use in in vivo imaging. Localization was successfully monitored by fluorescence imaging of living animals, by necropsy, by frozen tissue sections for optical microscopy, and by electron microscopy, on scales ranging from centimeters to nanometers, usi…
Uniform polyaniline nanofibers readily form using interfacial polymerization without the need for templates or functional dopants. The average diameter of the nanofibers can be tuned from 30 nm using hydrochloric acid to 120 nm using perchloric acid as observed via both scanning and transmission electron microscopy. W…
Abstract The purpose of this paper is to provide a succinct but nevertheless complete mechanistic overview of the various types of magnesium corrosion. The understanding of the corrosion processes of magnesium alloys builds upon our understanding of the corrosion of pure magnesium. This provides an understanding of th…
: In this paper, the optical performance degradation of a liquid crystal (LC) cell due to the instability of pre-tilt angle and polar anchoring strength of the alignment surface of liquid crystal devices is explored. Under accelerated thermal treatment, changes in both the pre-tilt angle and polar anchoring strength a…
This paper presents the results of investigations of the dielectric and spectral properties of NH2(CH3)2Al(SO4)2 × 6 H2O crystals doped with chromium. In particular, it is shown that the dopant noticeably changes the temperature of ferroelectric phase transition and corresponding thermal dipole relaxation with a criti…
The optical convergent-beam technique is used to measure, in 0.3 ms steps, the response of the director in a 4.6-μm-thick ZLI-2293 filled hybrid aligned nematic cell when a 10 kHz, 7 Vrms ac voltage is applied to the cell. The total time taken for the reorientation process is 2.4 ms, with backflow observed during the…
Nuclear magnetic resonance is used to characterize local atomic motions in the glassy and supercooled liquid states of the bulk metallic glass system ${\mathrm{P}\mathrm{d}}_{43}{\mathrm{N}\mathrm{i}}_{10}{\mathrm{C}\mathrm{u}}_{27}{\mathrm{P}}_{20}$. The temperature dependence of the Knight shift reveals that certain…
Gutes Rad ist billig: Eine neue Familie gemischter CeIV-MnIV-Cluster mit Ce:Mn-Verhältnissen zwischen 3:2 und 1:6 wurde hergestellt. Das Bild zeigt den Kern des CeMn6-Komplexes (Ce grün, Mn blau, O rot). Alle Verbindungen weisen antiferromagnetische Wechselwirkungen zwischen den MnIV-Ionen auf.
Gelöst in einer nematischen flüssigkristallinen Phase können starre scheibenförmige Makrolactame hexagonale Röhren bilden. Computermodelle (siehe Bild, O rot, N blau, C grau, H weiß), Raman- und IR-Mikrospektroskopie bringen eine hierarchische Selbstorganisation des Peptids in der flüssigkristallinen Phase zum Vorsche…
The effect of Y3+, La3+, Ga3+, Ti4+ and Nb5+ ions on the physical properties of stoichiometric Mg0.5Cu0.5Fe2O4 ferrite is investigated. The substitutions partially replace the Fe3+ ions and the chemical formula of the investigated ferrites is Mg0.5Cu0.5Fe2−xMe3x/nO4, where Me = Y, La, Ga, Ti and Nb, x = 0 and 0.2, and…
We present electron-spin-resonance (ESR), x-ray-diffraction, and dilatometry studies in a ${\mathrm{La}}_{7/8}{\mathrm{Sr}}_{1/8}{\mathrm{MnO}}_{3}$ single crystal. ESR experiments were performed in the paramagnetic regime ${(T}_{C}$ $\ensuremath{\approx}180\mathrm{K}),$ from 220 K to 570 K at a microwave frequency of…
The analysis of the white photoluminescence (PL) from Si+ and C+ coimplanted SiO2 is reported as a function of the implanted dose. By both steady and time-resolved measurements, the presence of several components in the emission between 2 and 3.3 eV has been resolved. The decays of the PL transients are characterized…
We report the observation of photoluminescence (PL) enhancement and quenching for 580 nm emission following the variation of time decay patterns, induced by Zn2+ and Mn2+ introduction, respectively, in colloidal ZnS:Mn2+ nanoparticles (NPs). The activation and quenching processes are analyzed considering surface nonra…
Degradation of TiO2-based ceramic capacitors was observed after hydrogen incorporation on the termination electrodes of the capacitors via electrolysis of water. Fourier-transform infrared (FTIR) absorption spectra analysis of polished rutile single crystals clearly showed that hydrogen was incorporated into the TiO2…
Außen Molekül – innen Festkörper? Mit einem Durchmesser von 3.7 nm an seiner breitesten Stelle ist [Ag262S100(StBu)62(dppb)6] (dppb=1,4-Bis(diphenylphosphanyl)butan) der größte durch Strukturanalyse charakterisierte Metallchalkogenidcluster (siehe Bild; P grün, S gelb und rot, Ag blau). Das Ag-S-Netz ähnelt Strukturen…
Cation ordering in covalent oxide glasses and melts profoundly affects the macroscopic properties, such as viscosity, diffusivity, and thermodynamic potentials. It is commonly assumed that in glasses and melts nonframework cations such as ${\mathrm{Na}}^{+},$ ${\mathrm{Ca}}^{2+},$ and ${\mathrm{Ba}}^{2+}$ distribute r…
Single crystals of bismuth titanate (BiT) and lanthanum-substituted BiT [Bi4−xLaxTi3O12 (BLT)] were grown by a self-flux method. BLT (x=0.85) showed a smaller remanent polarization (2Pr) along the a(b) axis of 41 μC/cm2 than 98 μC/cm2 for BiT, which mainly originates in its smaller ionic displacements along the a axis…