Materials Literature
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Abstract Ordered nanowells with diameters of ca. 40 nm and depth of 1–2 nm were prepared on a poly(methyl methacrylate) (PMMA) spherical domain, which was exposed on the polystyrene‐ block ‐poly(methyl methacrylate) (PS‐ b ‐PMMA) copolymer thin film. The PS‐ b ‐PMMA film formed spherical PMMA domains after the film wa…
Peculiarities in the nonlinear dielectric response of the relaxor lead magnoniobate (PMN) are explained within the classic Landau-Ginzburg-Devonshire theory. It turns out that a correction term proportional to the square of the polarization, P 0 2 , of polar nanoregions (PNRs) becomes relevant in relaxor ferroelectric…
We have examined time-averaged charges of the molecular donors around the phase boundary between the insulating, superconducting, and metal phases for ${\ensuremath{\beta}}^{\ensuremath{''}}$-type ET [$\mathrm{ET}=\text{bis}$-ethelenedithio-tetrathiafulvalene] salts with one (two) hole(s) per two (three) molecules by…
Sieving single atoms: The binding of single metal atoms to thin SiO2 films grown on Mo(112) depends on the size of the adatom. While Pd atoms are able to pass the nanopores in the silica network (see figure) and strongly bind to the Mo–SiO2 interface, Au atoms are too big for a penetration and interact only with line…
Half-Heusler alloys of the compositions X 1− a A a Ni 1− b B b Sn and X 1− a A a Co 1− b B b Sb (X = Hf,Zr) were synthesized with transition metals (A, B) substituted at the X and Ni/Co sites with the values of a and b between 0 and 0.15. Thermopower and electrical resistivity measurements from room temperature to 110…
SilconOxyCarboNitrides (SiCNO), made from thermal treatments of highly cross‐linked silicon, nitrogen, and oxygen containing polymers, exhibit intense luminescence that is broadly distributed over wavelengths of 500–800 nm. The intensity is sensitive to the composition, and especially to the heat‐treatment temperature…
Kolloidale Ag-Nanopartikel mit L-Glutathion-Beschichtung, die an Biman-Chromophore gebunden sind, wurden bezüglich ihrer absorptions- und fluoreszenzspektroskopischen Eigenschaften sowie ihres Circulardichroismus (CD) untersucht. Die Abhängigkeit der Verstärkung der Spektren durch resonante Ag-Oberflächenplasmonen von…
In situ monitoring of the transformation of B 4 C under electric field using Raman spectroscopy is reported. Application of electric fields up to 5000 V/cm leads to local segregation of carbon, indicated by the appearance of Raman D and G peaks. At low electric fields (<3000 V/cm) the segregated carbon is amorphous…
Abstract A novel montmorillonite (MMT)/polypyrrole (PPy) nanocomposite (MPN) with high electrical conductivity and thermal stability has been synthesized via in‐situ polymerization. The surface morphology, characterization, thermal stability, and electrical conductivity have been tested by scanning electron microscopy…
We present the calculations of the electronic structure and transport properties on the zinc-blende (ZB) and cinnabar phases of HgTe using the full-potential linearized augmented plane-wave method and the semiclassical Boltzmann theory. Our results show that n-doped cinnabar HgTe has a significant larger Seebeck coeff…
Abstract This paper describes the synthesis of narrowly distributed block copolymers consisting of a hole conducting triarylamine block and an anchor block via RAFT polymerization. The anchor block is thereby introduced via a reactive ester approach. Block copolymers with dopamine anchor groups bind to oxidic semicond…
Abstract The unusual grinding effects observed in the 1D spin crossover polymer [FeL(bipy)] n ( 1 ), with L being a tetradentate N 2 O 2 2– coordinating Schiff base type ligand {(3,3′)‐[1,2‐phenylenebis(iminomethylidyne)]bis(2,4‐pentanedionato)(2–)‐ N,N′,O 2 ,O 2 ′ } and bipy = 4,4′‐bipyridine, are investigated using…
Abstract The self‐assembly of two types of linear ABA triblock copolymers confined in cylindrical nanopores is studied using simulated annealing. The effects of pore size and block copolymer chain architecture on morphology, chain conformations and bridging fraction are investigated. For the bulk cylinder‐forming copo…
The behavior of adsorbed water on rutile TiO 2 (110) and 0.05 ML-equivalent Au/TiO 2 (110) have been probed over the temperature range from 110 to 800 K using a combination of temperature-programmed desorption (TPD), ion scattering spectroscopy (ISS), and X-ray photoelectron spectroscopy (XPS). Water, either predosed…
This article deals with oxy-fluorinated short KevlarTM fiber reinforcement and its effect on the dynamic, mechanical, and rheological properties of the syndiotactic polystyrene composites. The composites were prepared using a twin-screw extruder at 20 rpm and the resulting composite was molded under injection molding.…
We examine designs and operational characteristics of a candidate for universal memory: carbon-nanotube-based electromechanical data storage devices. Memory cells based on the bending of cantilever and suspended carbon nanotubes, and the relative motion of the walls of carbon nanotubes are discussed. These devices sho…
Abstract Pure polyethyl‐methacrylate (PEMA) and PEMA filled with CoCl 2 films were prepared by casting method. The structure and characterization of these film composites were investigated using Fourier transform infrared analysis (FTIR), optical spectra (UV), X‐ray diffraction (XRD), thermogravimetric analysis (TGA),…
Immer heller: Die Absorptionskoeffizienten und Fluoreszenzquantenausbeuten einer Reihe von meso-Oligo(1,4-phenylenethinylen)-substituierten Subporphyrinen werden erheblich größer, wenn die Kettenlänge der Substituenten zunimmt (siehe Bild). Bei den Zweiphotonenabsorptionseigenschaften innerhalb der Reihe konnte die Zu…
LCAO and PW DFT calculations of the lattice constant, bulk modulus, cohesive energy, charge distribution, band structure, and DOS for UN single crystal are analyzed. It is demonstrated that a choice of the uranium atom relativistic effective core potentials considerably affects the band structure and magnetic structur…
Two novel guanidinium iodoantimonate(III) and iodobismuthate(III) crystals, [C(NH 2 ) 3 ] 3 [Sb 2 I 9 ] and [C(NH 2 ) 3 ] 3 [Bi 2 I 9 ], have been synthesized and their structures have been determined by means of single-crystal x-ray diffraction studies at three temperatures (293, 348 and 362 K). Both compounds appear…