Materials Literature
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Organoclay hollow microspheres (see Figure) and spheroids with foam-like interiors have been prepared by an in-situ reaction in water-in-oil emulsion droplets. The materials could be calcined at 673 K with retention of the morphology, thus proving the thermal stability. The technique should be applicable to a wide ran…
We examined a novel approach for nanometer-scale fabrication by controlling self-assembly of organic molecules. Organic amphiphile molecules typically self-assemble into a spherical or tubular structure, which depends on environmental conditions such as temperature, pH, and solvents. Here we demonstrate that self-asse…
The transition that has been observed in the dynamics of hydrated proteins at low temperatures (180-230 K) is normally interpreted as a change from vibrational, harmonic motion at low temperatures to anharmonic motions as the temperature is raised. It is taken to be an intrinsic property of proteins and has been assoc…
Carbon nanotube films that are mechanically robust and light weight (see Figure) have been engineered to coat surfaces of metallic structures or to be embedded within composite/heterogeneous systems. For high-temperature applications the performance of the nanotube films is expected to be superior to conventional damp…
Uniaxial orientation of metal–organic europium complexes (see Figure) has been achieved using ultra-high molecular weight polyethylene. The orientation of the ligand molecules results in the transfer of polarized energy from the ligand to Eu3+, and thus yields polarized emission from the complex. The spectral properti…
The syntheses of new aromatic 30pi heptaphyrins either through a [5 + 2] or a [4 + 3] acid-catalyzed condensation and oxidative coupling reactions of easily available and air-stable precursors are reported. The methodology followed is not only simple and efficient but also allows synthesis of a range of heptaphyrins w…
A porous scaffold as a cell-compatible material was designed and prepared using a phospholipid copolymer composed of 2-methacryloyloxyethyl phosphorylcholine (MPC), n-butyl methacrylate, and enantiomeric macromonomers, the poly(L-lactic acid) (PLLA) macromonomer, and poly(D-lactic acid) (PDLA) macromonomer. On the bas…
Ceramic samples of the tetragonal tungsten bronze Ba2LaTi2Nb3O15, containing B-site disorder of Ti,Nb, have a maximum permittivity of 250–300 at Tc ≈ 200 K and frequency-dependent permittivity below Tc, characteristic of relaxor behaviour.
Tetrathiafulvalene carboxylate associates with the charge neutral complex, Yb.DO3A, in methanolic solution to give rise to a novel ternary species; the tetrathiafulvalene unit transfers energy to the lanthanide, causing luminescence from the Yb metal, indicating for the first time that an electron donor chromophore ca…
Polarization-dependent x-ray absorption measurements were performed on crystalline ZnO three-dimensional arrays consisting of highly oriented microrods as well as on particulate thin films consisting of monodisperse spherical nanoparticles. Strong anisotropic effects have been observed for the highly oriented ZnO rods…
An ordered macroporous carbon with 62 nm spherical pores was synthesized using colloidal-crystal templating and found to exhibit unique gas adsorption properties that have been so far attributed to adsorption in mesopores (size below 50 nm).
We have performed atomistic simulations for cylindrical multi-shell (CMS)-type Cu nanowires containing defects. Our investigation has revealed some physical properties that have not been detected in previous studies that have considered defect-free nanowires. Since the vacancy formation energy is lowest in the core of…
We investigated the effect of SiC nano-particle doping on the crystal lattice structure, critical temperature T_c, critical current density J_c, and flux pinning in MgB_2 superconductor. A series of MgB_{2-x}(SiC)_{x/2} samples with x = 0 to 1.0 were fabricated using in-situ reaction process. The contraction of the la…
3,4-Dihydroxyphenylalanine (DOPA) residues are known for their ability to impart adhesive and curing properties to mussel adhesive proteins. In this paper, we report the preparation of linear and branched DOPA-modified poly(ethylene glycol)s (PEG-DOPAs) containing one to four DOPA endgroups. Gel permeation chromatogra…
Reactive magnesium oxide nanoparticles and halogen (Cl 2, Br 2 ) adducts of these MgO particles were allowed to contact certain bacteria and spore cells. Bacteriological test data, atomic force microscopy (AFM) images, and electron microscopy (TEM) images are provided, which yield insight into the biocidal action of t…
The novel quaternary uranium thiophosphate K11U7(PS4)13 has been synthesized by reacting uranium metal, K2S, S, and P2S5 at 700 degrees C in an evacuated silica tube. The crystal structure was determined by single crystal X-ray diffraction techniques. K11U7(PS4)13 crystallizes in the tetragonal space group I42d (a = 3…
Effizienter Gastaustausch: In einer Iodatmosphäre zeigt das organische Zeolithanalogon TPP⋅x(THF) (x=0.35–0.6) eine sofortige I2-Sorption. Der zuvor farblose Kristall (a) färbt sich an den Kristallenden (b) und ist nach 1–2 Tagen vollständig mit I2 durchdrungen (c). Die elektrische Leitfähigkeit der TPP⋅y(I2)-Kristall…
Sechs Mo-Dimere, die um ein zentrales PO4-Tetraeder gruppiert sind, bilden den Kern des neuartigen, von vier {La(H2O)4}3+-Einheiten umgebenen ε-Keggin-Polyoxokations [ε-PMo12O36(OH)4{La(H2O)4}4]5+ (siehe Struktur). 31P-NMR-spektroskopische Untersuchungen ergaben, dass ε-Keggin-Ionen in wässriger Lösung nicht stabil si…
Abstract A stress‐induced crystallization model for semicrystalline plastics is proposed based on the theory that stress‐induced orientation of molecules and chains increase the melting temperature of thermoplastics, and hence, the supercooling which is the driving force for crystallization. By assuming that the effec…
A detailed investigation of local structure and phase transitions in copper iodide (CuI), at high temperatures, has been carried out performing x-ray absorption spectroscopy (XAS), x-ray absorption temperature scans, and energy scanning x-ray diffraction measurements. Low-noise XAS spectra have been recorded in a wide…