Materials Literature
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Novel copper(II)-nitroxide complexes exhibiting a spin-transition-like behavior have been prepared and characterized. They include meso, chiral, and racemic 2-(3-pyridyl)-nitronyl nitroxides differently substituted in positions 4 and/or 5 by ethyl groups and pyrimidyl nitroxides. Depending on the stoichiometry of the…
Abstract The effects of carbon nanofibers (CNFs) on the microstructure and properties of semi‐crystalline polymers were studied based on the preparation of poly(propylene) (PP) nanocomposites by a twin screw extrusion method. The crystallization behavior and morphology, as well as the thermal and mechanical properties…
An interfacial peptide coating possessing domains that bind to Ti and endothelial cells is synthesized (see figure). Peptides with specific adherence to Ti are identified using phage display, and the RGD motif was selected for cell binding. The peptide can be applied from aqueous solution and possesses micromolar bind…
A novel poly(vinyl)silazane-block-polystyrene diblock copolymer is successfully synthesized by living free-radical polymerization via a reversible addition fragmentation chain transfer (RAFT) route (see figure). The obtained diblock copolymer, having an inorganic volume fraction of 0.69, leads to phase-separation at t…
To overcome shortcomings of current heart valve prostheses, novel hybrid valves were fabricated from decellularized porcine aortic valves coated with poly (3-hydroxybutyrate-co-3-hydroxyhexanoate [PHBHHx]). In the mechanical test in vitro, the biomechanical performance of hybrid valve was investigated. In an in vivo s…
Precise control over the molecular structure of cylindrical micelles yields novel supramolecular architectures.
In order to gain a further insight into the knowledge of point defects of ZnO, positron annihilation lifetime spectroscopy was performed on bulk samples annealed under different atmospheres. The samples were characterized at temperatures ranging from $10\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}50…
Abstract An epoxy‐based negative‐tone photoresist, which is known as a suitable material for high‐aspect‐ratio surface micromachining, is functionalized with red‐light‐emitting CdSe@ZnS nanocrystals (NCs). The proper selection of a common solvent for the NCs and the resist is found to be critical for the efficient inc…
Dielectric measurements on $0.65[\mathrm{Pb}({\mathrm{Ni}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}]\ensuremath{-}0.35\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ ceramic in the temperature range $90--470\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ show a relaxor ferroelectric transition around $350\phantom{\rule{0.3em}{0ex}}\m…
Abstract Hydroformylation of 1‐hexene with rhodium colloids stabilized by poly(ethylene imine) amides with a hyperbranched polyamine core and a lipophilic periphery is reported. The catalyst selectivity for aldehydes increases with increasing temperature or pressure. The ratio of linear to branched aldehydes decreases…
Stimulierbare Fasern: Aggregate aus Nanofasern mit hydrophilen Oligoethylenoxid-Dendronen als Hülle gehen beim Erwärmen reversibel in hydrophobe Nanofaserbündel über, da eine Dehydratisierung der dendritischen Ketten auftritt (siehe Schema). Ein thermischer Sol-Gel-Phasenübergang ist die Folge.
We used small-angle X-ray scattering (SAXS) to quantitatively characterize the morphological characteristics of pristine and mechanically manipulated multiwall carbon nanotube (MWCNT) films. We determined that CNT diameters measured near the edges of a film were smaller compared to those measured in the interior. Unia…
The effect of antimony concentration on the piezoelectric properties of (Na 0.5 K 0.5 ) 0.945 Li 0.055 Nb 1− x Sb x O 3 was examined for 0≤ x ≤0.1. The piezoelectric coefficients exhibited a maximum, d 33 =240 pC/N and d 31 =−82 pC/N at x =0.04, coinciding with the maximum of the grain size and the apparent density at…
Abstract A new partially fluorinated cationic surfactant, 1‐(10‐perfluorooctyldecyl)pyridinium bromide monohydrate, is synthesized and used as the template for mesoporous ceramic and inorganic–organic hybrid particles. Several hydrolyzed alkoxide precursors are shown to co‐assemble with this surfactant to form hollow…
Abstract Novel bisphenol monomers ( 1a‐d ) containing phthalimide groups were synthesized by the reaction of phenolphthalein with ammonia, methylamine, aniline, and 4‐ tert ‐butylanilne, respectively. A series of cardo poly(arylene ether sulfone)s was synthesized via aromatic nucleophilic substitution of 1a‐d with dic…
By combining dielectric, specific heat, and magnetization measurements and high-resolution neutron powder diffraction, we have investigated the thermodynamic and magnetic and structural properties of the metastable orthorhombic perovskite ${\mathrm{ErMnO}}_{3}$ prepared by high-pressure synthesis. The system becomes a…
Abstract Double‐grafted cylindrical brushes with poly(lauryl methacrylate) (PLMA) as the side chains were synthesized using the grafting‐from strategy via atom transfer radical polymerization (ATRP). The polyinitiator poly[2‐(2‐bromoisobutyryloxy)ethyl methacrylate] (PBIEM) with $\overline {DP} _{\rm n}$ = 240 and 1 5…
Long-circulating liposomes, such as PEG-liposomes, are frequently studied for drug delivery and diagnostic purposes. In our group, poly(amino acid) (PAA)-based coatings for long-circulating liposomes have been developed. These coatings provide liposomes with similar circulation times as compared to PEG-liposomes, but…
A synthetic route of potentially wide scope is reported herein for the organoimido functionalization of polyoxotungstates. This report focuses on the reaction between the monovacant lacunary polyoxotungstate, alpha-((n-C4H9)4N)4H3[PW11O39], and W(NC6H5)Cl4 in anhydrous acetonitrile. Evidence from 1H, 31P, 183W, and 1H…
Europium‐doped borophosphate glasses were prepared by the melt quenching method for application in light‐emitting diodes. Emission spectra and electron paramagnetic resonance were studied for the glass samples. The relative intensity ratio of Eu 2+ to Eu 3+ emissions is composition dependent, especially the B 2 O 3 /P…