Materials Literature
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Ordnung reinbringen: Ein freies [2]Catenan und sein Kupferkomplex mit gabelartigen Mesogenen bilden über große Temperaturbereiche nanosegregierte Flüssigkristallstrukturen. Die geordnete Anordnung des freien [2]Catenans in der smektischen A-Phase hat einen erheblichen Einfluss auf die Konformation der beiden Makrocycl…
We study numerically spatio-temporal fluctuations during the out-of-equilibrium relaxation of the three-dimensional Edwards–Anderson model. We focus on two issues. (1) The evolution of a growing dynamical length scale in the glassy phase of the model, and the consequent collapse of the distribution of local coarse-gra…
The structure of columnar phases formed by bent-core mesogens is analyzed. The combination of the X-ray diffraction intensity data and the model predictions for the form factor phases allows for the construction of the electron density maps for these phases. Within the model, the smectic layer fragments are approximat…
We report the polymerization mechanism and kinetics of muconic esters as the 1,3-diene monomers during solid-state polymerization via a crystal-to-crystal transformation. We have revealed a change in the structure of the muconate crystals accompanying the shrinking and expanding of the lattice lengths, on the basis of…
A new defect-forming mechanism is predicted for liquid crystals undergoing an isotropic-to-nematic phase transition. A continuum theory characterizes how +1/2 defects (D<30 nm) evolve within and then shed from the interface (cross section approximately 100 nm) of a growing 5CB (4-n-4'-pentyl-4-cyanobiphenyl) nanodropl…
We illustrate the strong connection between optics and high-frequency electronics by presenting circuit calculations for resonant metamaterials in the optical frequency range. An $RLC$ circuit model is considered. Equations for impedances are derived and used to calculate the resonance positions and quality factors of…
To stick or not to stick? Metastable (α) and stable (γ) polymorphs of indomethacin crystallize concomitantly from ethanol solutions. Crystallization in glass vials functionalized with perfluoroalkyl-terminated silane monolayers, however, leads to the exclusive growth of the stable polymorph. These monolayers create su…
Abstract This investigation deals with the synthesis, characterization and actuation behavior of conductive polyaniline‐coated electroactive paper actuators. The actuator is made by electrochemical deposition of conductive polyaniline on a cellulose paper. The aim of the investigation was to improve the bending displa…
Abstract Natural rubber (NR), epoxidized natural rubber (ENR), and chlorosulfonated polyethylene (CSM) composites filled with conductive carbon black and aluminum powder have been prepared by using a two‐roll mill. An electromagnetic interference shielding effectiveness of those rubber composites was carried out in th…
This study describes the electron transfer (ET) phenomenon through a series of (Pro-Hyp-Gly) repeat units containing collagen mimics. The peptides contain redox-active ferrocene (Fc) and thiol-functionalized cystein (Cys) at the N- and C-terminals, respectively. Peptide films were prepared on gold surfaces and charact…
In this paper we present results of DFT calculations on bare and hydrogenated ${\mathrm{Al}}_{12}$ cluster with icosahedral symmetry, an atomic ``cage'' obtained by removing the central Al ion from the most stable ${\mathrm{Al}}_{13}$ cluster. We discuss similarities and differences between structural, energetic, and…
Plastic deformation of amorphous, thermally noncrystallizable poly(L/DL-lactide) 70/30 (P(L/DL)LA) was induced by a plane-strain compression in a channel-die at different temperatures, above the glass transition (Tg) from 60 to 90 degrees C. Samples undeformed (reference) and deformed to different compression ratios,…
Carbon nanomaterials show a variety of interesting chemical and physical properties. In this Minireview we focus on the mechanical properties of carbon nanomaterials with emphasis on carbon nanotubes and their composite materials. We introduce some recently developed components made of carbon nanotube composite materi…
The biosynthesis of UDP-GlcNAc in bacteria is carried out by GlmU, an essential bifunctional uridyltransferase that catalyzes the CoA-dependent acetylation of GlcN-1-PO(4) to form GlcNAc-1-PO(4) and its subsequent condensation with UTP to form pyrophosphate and UDP-GlcNAc. As a metabolite, UDP-GlcNAc is situated at a…
Ternary clathrates Ba–Zn–Ge: phase equilibria, crystal chemistry and physical properties, Melnychenko-Koblyuk, N, Grytsiv, A, Fornasari, L, Kaldarar, H, Michor, H, Röhrbacher, F, Koza, M, Royanian, E, Bauer, E, Rogl, P, Rotter, M, Schmid, H, Marabelli, F, Devishvili, A, Doerr, M, Giester, G
Novel biobased aromatic triols (1,3,5-(9-hydroxynonyl)benzene and 1,3,5-(8-hydroxyoctyl)-2,4,6-octylbenzene) were synthesized through the transition-metal-catalyzed cyclotrimerization of two alkyne fatty acid methyl esters (methyl 10-undecynoate and methyl 9-octadecynoate) followed by the reduction of the ester groups…
Nanotube templates assembly: Water-soluble conjugates between gold nanoparticles and DNA-wrapped single-walled carbon nanotubes (SWNTs), as shown in the figure, are constructed based on a self-assembly strategy that does not require any chemical modifications to the sidewalls of the SWNTs, which minimizes the possibil…
Size- and shape-dependent optical properties of gold nanorods allow monitoring their growth using a novel fast single-particle spectroscopy (fastSPS) method. FastSPS uses a spatially addressable electronic shutter based on a liquid crystal device to investigate particles randomly deposited on a substrate, orders of ma…
D-Glucose/D-Galactose-binding protein (GGBP) mediates chemotaxis toward and active transport of glucose and galactose in a number of bacterial species. GGBP, like other periplasmic binding proteins, can exist in open (ligand-free) and closed (ligand-bound) states. We report a 0.92 angstroms resolution structure of GGB…
In this study, structure changes of regenerated cellulose fibers wet-spun from a cotton linter pulp (degree of polymerization approximately 620) solution in an NaOH/urea solvent under different conditions were investigated by simultaneous synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering…