Materials Literature
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Contrary to interstitial metal hydrides, where the thermodynamic stability of the metal hydride can be tuned by substitutions on the metal lattice, few examples of such substitutions have been reported for complex hydrides. The present paper shows a new and alternative approach to affect the stability of complex hydri…
The enormous species diversity of diatoms correlates with the remarkable range of cell sizes in this group. Nuclear DNA content relates fundamentally to cell volume in other eukaryotic cells. The relationship of cell volume to G1 DNA content was determined among selected members of the genus Thalassiosira, one of the…
The synthesis and structural study of the stoichiometric perovskite La 0.5 Ba 0.5 CoO 3 have allowed three forms to be isolated. Besides the disordered La 0.5 Ba 0.5 CoO 3 and the perfectly ordered layered LaBaCo 2 O 6, a third form called nanoscale-ordered LaBaCo 2 O 6 is obtained. As evidenced by transmission electr…
Abstract Poly(vinylidene fluoride) (PVDF) was electrospun into ultrafine fibrous membranes from its solutions in a mixture of N , N ‐dimethylformamide and acetone (9:1, v/v). The electrospun membranes were subsequently treated by continuous hot‐press at elevated temperatures up to 155°C. Changes of morphology, crystal…
The nucleation and growth of three-dimensional superlattices of gold nanoparticles has been followed directly in situ by means of small angle x-ray scattering. These assemblies spontaneously form in a dilute solution providing the particles are large enough to generate a van der Waals driven attraction sufficient to c…
The impact of microbial activity on biofilm calcification in aquatic environments is still a matter of debate, especially in settings where ambient water has high CaCO3 mineral supersaturation. In this study, biofilms of two CO2-degassing karst-water creeks in Germany, which attain high calcite supersaturation during…
We present the ReaxFF reactive force field developed to provide a first-principles-based description of oxygen ion transport through yttria-stabilized zirconia (YSZ) solid oxide fuel cell (SOFC) membranes. All parameters for ReaxFF were optimized to reproduce quantum mechanical (QM) calculations on relevant condensed…
Desorption kinetics of methanol on Au(111) and the oxidation of methanol on atomic oxygen pre-covered Au(111) have been investigated employing temperature programmed desorption (TPD) and molecular beam reactive scattering (MBRS). On clean Au(111), methanol is weakly adsorbed and desorbs molecularly. Three adsorption s…
Abstract NaBH 4 · 2H 2 O and NaBH 4 were studied by single‐crystal X‐ray diffraction and vibrational spectroscopy. In NaBH 4 · 2H 2 O, the BH 4 – anion has a nearly ideal tetrahedral geometry and is bridged with two Na + ions through the tetrahedral edges. The structure does not contain classical hydrogen bonds, but r…
Oxidation ohne Organik: Ein Tetraruthenium-Polyoxometallat-Hybrid (siehe Bild; Ru blau, O rot, Si gelb, W schwarz) katalysiert die schnelle Oxidation von H2O zu O2 bei Raumtemperatur. Der unter den Reaktionsbedingungen stabile Komplex wurde unter anderem kristallographisch und cyclovoltammetrisch charakterisiert.
The structural, dynamical and dielectric properties of the cubic phase of perovskite barium stannate BaSnO3, a potential candidate as protonic conductor for solid oxide fuel cells, have been investigated by the means of first-principles density functional calculations, and the structural and electrical properties have…
Shell cross-linked (SCL) thermoresponsive hybrid micelles consisting of a cross-linked thermoresponsive hybrid hydrophilic shell and a hydrophobic core domain were synthesized from poly(N-isopropylacrylamide-co-3- (trimethoxysilyl)propyl methacrylate)-b-polymethyl methacrylate (P(NIPAAm-co-MPMA)-b-PMMA) amphiphilic bl…
The annealing behavior of poly( l -lactic acid) (PLLA) and poly( d -lactic acid) (PDLA) single crystals was investigated in order to reveal the mechanism of chain diffusion in their solid states, below their melting points. The structural changes of the sedimented single-crystal mats on continuous heating were followe…
A series of electroactive aromatic polyamides with 4-(dimethylamino)triphenylamine [(NMe 2 )TPA] units in the backbone were prepared from a newly synthesized diamine monomer, 4,4′-diamino-4′′-(dimethylamino)triphenylamine, and various aromatic dicarboxylic acids via the phophorylation polyamidation reaction. These pol…
We show that the bulk transport magnetic current is generated by the moving magnetic kink crystal (chiral soliton lattice) formed in the chiral helimagnet under the static magnetic field applied perpendicular to the helical axis. The current is caused by the non-equilibrium transport momentum with the kink mass being…
Tunneling spectroscopy was performed on Nb pieces prepared by the same processes used to etch and clean superconducting radio frequency (SRF) cavities. Air exposed, electropolished Nb exhibited a surface superconducting gap delta=1.55 meV, characteristic of clean, bulk Nb. However the tunneling density of states (DOS)…
We measure the microwave signals produced by spin-torque-driven magnetization dynamics in patterned magnetic multilayer devices at room temperature, as a function of the angle of a magnetic field applied in the sample plane. We find strong variations in the frequency linewidth of the signals, with a decrease by more t…
Recently, it has been demonstrated that a careful treatment of both longitudinal and transverse matrix elements in electron energy loss spectra can explain the mystery of relativistic effects on the magic angle. Here, we show that there is an additional correction of order ${(Z\ensuremath{\alpha})}^{2}$, where $Z$ is…
We have studied the chemical potential shift as a function of temperature in ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ by measurements of core-level photoemission spectra. For ferromagnetic samples ($x=0.4$ and 0.45), we observed an unusually large upward chemical potential shift w…
Heterostructures consisting of PbZr0.2Ti0.8O3 and PbZr0.4Ti0.6O3 films grown on a SrTiO3 (100) substrate with a SrRuO3 bottom electrode were prepared by pulsed laser deposition. Using the additional interface provided by the ferroelectric bilayer structure and changing the sequence of the layers, the dislocation conte…