Materials Literature
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Simultaneous surface enhanced Raman scattering (SERS) and fluorescence is demonstrated from single conjugated polymer chains. As resonance enhancement of SERS depends on the spectral overlap of the polymer's absorption and the incident laser, resonance Raman and fluorescence effectively probe the absorbing and emittin…
Two new three-dimensional open frameworks, {[Cu 4 V 13 IV V 5 V O 42 (NO 3 )(C 3 H 10 N 2 ) 8 ]·10H 2 O} n ( 1 ) and {[Cu 4 V 12 IV V 6 V O 42 (SO 4 )(C 3 H 10 N 2 ) 8 ]·10H 2 O} n ( 2 ), have been hydrothermally synthesized. Structural analysis indicates that both complexes are isomorphic and are constructed from a c…
Kooperative Kristalle: In ferroelektrischen Cokristallen von Iodanilsäure (siehe Bild, orange) und 5,5′-Dimethyl-2,2′-bipyridin (grün) sind die Moleküle durch OH⋅⋅⋅N- und N+H⋅⋅⋅O−-Wasserstoffbrücken zu polaren Ketten verknüpft. Anlegen eines kleinen elektrischen Feldes E bewirkt einen kooperativen Protonentransfer übe…
The influence of the rigidity of polymer backbones on the side-chain crystallization and phase transition behavior was systematically investigated by a combination of differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), Fourier transform infrared spectroscopy (FTIR), and high-resolution solid-…
A novel method for producing full‐dense nano‐grained alumina was reported. The heat generated by the combustion reaction (or self‐propagating high‐temperature synthesis (SHS)) was applied to act as a heating source. An alumina compact was loaded inside the combustion reactants. After reaction, the temperature of the a…
For biomineralization processes, the interaction of the surface of calcite crystals with organic molecules is of particular importance. Especially, biologically controlled biomineralization as in exoskeletons of mollusks and echinoderms, e.g., sea urchin with single-crystal-like spines and shells,1-3 requires molecula…
Piezoelectric actuators generally are driven with unipolar electric load cycles. Although the obtainable strain is increased by small excursions into the negative field regime, this type of load cycle is rarely considered, as its long‐time reliability has been questioned. Here, we investigate the degradation of lead z…
The electron states of a finite-width graphene sheet in the presence of an electrostatic confining potential and a perpendicular magnetic field are investigated. The confining potential shifts the Landau levels inside the well and creates current-carrying states at or close to the interface with the potential barriers…
The enantiomerically pure bis-bidentate ligands of bis(pyrrol-2-ylmethyleneamine)cyclohexane [H2(LR,S)] are easily synthesized from condensation of the pure R,R and S,S enantiomers of the 1,2-diaminecyclohexane spacer with 2 equiv of pyrrole-2-carbaldehyde. The coordination of [H2(LR,S)] with a H2O molecule and metal…
[structure: see text] We demonstrate that incorporating nonplanar spiro-bridged structures is an effective strategy for tuning supramolecular interactions of optoelectronic functional moieties. In the model compounds spiro-bridged oligothiophene-S,S-dioxides (BSiSDTFO), unusual dimers constructed by spiro-bridged spac…
The pore hierarchy of a hierarchical porous SiO2 with 14 nm spherical mesopores and 3 nm worm-like pores (KLE1C16) is studied by small-angle neutron scattering (SANS) in combination with in-situ nitrogen sorption at 77 K. A novel setup is used developed at Hahn-Meitner Institute, Berlin. It is demonstrated that in the…
Genetic engineering provides a useful strategy to generate native and designed fibrous proteins, such as silks and collagens, for fundamental and applied studies. Recent studies on biosynthesized spider and silkworm silks, and human collagens, are reviewed with a focus on genes, expression systems and biomaterial appl…
Bicyclo[2.2.2]octadiene-connected pyrrolo-porphyrins have been prepared by an inverse-type [3+1] porphyrin synthesis of a bicyclo[2.2.2]octadiene-fused dipyrrole with a tripyrrane dicarbaldehyde. Another [3+1] porphyrin synthesis of pyrrole-connected porphyrins with the same or other tripyrrane dicarbaldehydes gave bi…
We fabricate oil-in-water emulsions above the melting temperature of the oil phase (hexadecane and/or paraffin). Upon cooling, the oil droplets crystallize and the initially fluid emulsions turn into hard gels. The systems evolve by following two distinct regimes that depend on the average droplet size and on the oil…
The Raman piezo‐spectroscopic constants of tetragonal prime yttria‐stabilized zirconia under uniaxial compression have been determined. Although the Raman band at 461 cm −1 is not the most intense, it is the most appropriate peak for stress measurement because of its large stress‐induced peak shift and the minimum ove…
Aerodynamic levitation combined with laser heating was used to prepare melts in the HfO 2 –La 2 O 3 (–Gd 2 O 3 ) systems. All melts crystallized upon quenching in oxygen. Hf 2 La 2 O 7 pyrochlore and Gd 0.5 Hf 0.5 O 1.75 fluorite phases were identified. Gd 0.5 Hf 0.5 O 1.75 fluorite was transformed into the pyrochlore…
Formation of ${\mathrm{Ag}}_{6}{\mathrm{Mo}}_{10}{\mathrm{O}}_{33}$ nanowires, ${\mathrm{Ag}}_{2}\mathrm{Mo}{\mathrm{O}}_{4}$ nanoparticles, and ${\mathrm{Ag}}_{2}{\mathrm{Mo}}_{2}{\mathrm{O}}_{7}$ nanorods embedded in silver molybdate glassy matrix has been confirmed from x-ray diffraction, field-emission scanning el…
Hyperbranched poly(amido amine) (h‐PAMAM) was synthesized from different feed ratios of diethylene triamine and methyl acrylate by the simple one‐pot and commercial synthesis method. Reaction procedures and products were intensively studied by FTIR, inherent viscosity and fluorescence techniques. The ill‐structured h‐…
The biofunctionalization of materials creates interfaces on which proteins, cells, or tissues can fulfill native or desired tasks. Here we report how to control the assembly of type I collagen into well-defined nanoscopic matrices of different patterns. Collagen fibrils in these ultrathin (approximately 3 nm) matrices…
In $\mathrm{Sm}\text{\ensuremath{-}}\mathrm{Co}∕\mathrm{Fe}$ exchange-spring magnet films, the magnetization reversal processes of constituent elements and layers were studied with an emphasis on the role of diffused Co atoms. Enhanced coupling effectiveness was observed in a film with a graded interface where signifi…