Materials Literature
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H(2) and D(2) adsorption on single-wall carbon nanohorns (SWNHs) have been measured at 77 K, and the experimental data were compared with grand canonical Monte Carlo simulations for adsorption of these hydrogen isotopes on a model SWNH. Quantum effects were included in the simulations through the Feynman-Hibbs effecti…
Glycerol was used as a substrate in the bio-production of poly(hydroxyalkanoates) (PHAs) in an effort to establish an alternative outlet for glycerol and produce value-added products. Pseudomonas oleovorans NRRL B-14682 and Pseudomonas corrugata 388 grew and synthesized poly(3-hydroxybutyrate) (P3HB) and medium-chain-…
We present a charge and self-energy self-consistent computational scheme for correlated systems based on the Korringa-Kohn-Rostoker (KKR) multiple scattering theory with the many-body effects described by the means of dynamical mean field theory (DMFT). The corresponding local multi-orbital and energy dependent self-e…
The gate-controlled electron spin interference was observed in nanolithographically defined square loop (SL) arrays fabricated using In$_{0.52}$Al$_{0.48}$As/In$_{0.53}$Ga$_{0.47}$As/In$_{0.52}$Al$_{0.48}$As quantum wells. In this experiment, we demonstrate electron spin precession in quasi-one-dimensional channels th…
Temperature dependences of the optic phonons in $\rm PbSc_{1/2}Ta_{1/2}O_3$ sol-gel films deposited on sapphire substrates were studied by means of Fourier transform far-infrared transmission spectroscopy in the temperature range 20-900\K. Four films displaying different B-site order with both ferroelectric and relaxo…
Repellent films: Poly(alkylpyrrole) conductive films with a water contact angle larger than 150° are stable to temperature, organic solvents, and oils and are super water-repellent. The surface of the film is a fractal and consists of an array of perpendicular needle-like structures (see picture; inset: digital camera…
Abstract Als wichtigster Gerüstbildner der Pflanzenwelt ist das Polysaccharid Cellulose ein nahezu unerschöpflicher polymerer Rohstoff mit einem faszinierenden Struktur‐ und Eigenschaftspotenzial. Durch reguläre Verknüpfung von D ‐Glucose‐Bausteinen gebildet, zeichnet sich das hochfunktionalisierte lineare und kettens…
Using a global optimization approach that directly searches for the composition of greatest stability, we have been able to find the particularly stable structures for binary Lennard-Jones clusters with up to 100 atoms for a range of Lennard-Jones parameters. In particular, we have shown that just having atoms of diff…
The ${\mathrm{Fe}}^{3+}$ center in ferroelectric $\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ together with an oxygen vacancy forms a charged defect associate, oriented along the crystallographic $c$ axis. Its microscopic structure has been analyzed in detail comparing results from a semiempirical Newman superposition mod…
The use of new shell cross-linked micelles as pH-responsive particulate emulsifiers is described for the first time. 1-Undecanol-in-water emulsions of 18 mum diameter are formed at pH 8, whereas complete demulsification occurs at pH 2.
Reversible optical control of protein structure and function offers the possibility of probing and manipulating individual proteins within the complex environment of a living cell. As a first step toward creating artificial photocontrolled proteins, we have designed and synthesized reversible, photocontrolled peptide…
The ability to control and enhance the response of polyaniline nanofibers to molecules such as hydrogen sulfide is demonstrated through the formation of nanostructured, conducting organic/inorganic hybrid materials. Polyaniline nanofiber composites with transition-metal chlorides have remarkable responses to hydrogen…
As the most important skeletal component in plants, the polysaccharide cellulose is an almost inexhaustible polymeric raw material with fascinating structure and properties. Formed by the repeated connection of D-glucose building blocks, the highly functionalized, linear stiff-chain homopolymer is characterized by its…
The crystal structure of 1,2:3,4-dibenzanthracene, C22H14, was solved by simulated annealing from laboratory X-ray powder diffraction data collected at room temperature to 1.8 Å resolution. Subsequent Rietveld refinement yielded an Rwp value of 0.036. The molecules crystallize in space group P21 with two independent m…
Abstract The shear viscosity, extensional viscosity, and die swell of the PTT melt were investigated using a capillary rheometer. The results showed that the PTT melt was a typical pseudoplastic fluid exhibiting shear thinning and extensional thinning phenomena in capillary flow. There existed no melt fracture phenome…
Nanowires of antimony (Sb) with diameters ranging from 90 down to 20 nm have been synthesized by electrodeposition within nanoporous polycarbonate membrane. The salient point of the present work is the detailed examination of each wire individually giving evidence of their good quality. The growth morphology, crystall…
The structure of AgCd2GaS4, known from powder data, has been redetermined by means of single-crystal X-ray diffraction. The structure can be described as a superstructure of wurtzite. All metal atoms are in a slightly distorted tetrahedral environment formed by the S atoms. The Ag, the Ga and two S atoms are situated…
A mathematical model is proposed for predicting the copolymer composition of the microbially synthesized polyhydroxyalkanoate (PHA) copolymers. Based on the biochemical reactions involved in the precursor formation and polymerization pathways, the model correlates the copolymer composition with the cultivation conditi…
An explanation is proposed for spontaneous magnetism in the material, ``carbon nanofoam,'' in terms of random ferrimagnetism. Wherever a carbon nanotube branches out, an electron trap is created at the junction. Electrons occupying neighboring junctions align their spins antiparallel. Given that there are more sites o…
Abstract The effect of molecular weight of poly(ε‐caprolactone) (PCL) on the formation and stability of inclusion complexes (ICs) between α‐cyclodextrin (α‐CD) and PCL was investigated by FTIR, WAXD, and DSC measurements. ICs between α‐CD and PCLs with a wide range of number‐average molecular weight, M n = 1.21 × 10 4…