Materials Literature
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The use of 4.2 nm gold nanoparticles wrapped in an adsorbates shell and embedded in a TiO2 metal oxide matrix gives the opportunity to investigate ultrafast electron-electron scattering dynamics in combination with electronic surface phenomena via the surface plasmon lifetimes. These gold nanoparticles (NPs) exhibit a…
ZnO nanorods were epitaxially grown by metalorganic chemical vapour deposition (MOCVD) on sapphire (0001) and substrates. The nanorods were elongated along the ZnO c-axis which was parallel to the substrate normal. Good alignment among the rods was achieved both in the length direction and in the in-plane orientations…
We discuss the polarization properties and first‐order diffraction efficiencies of volume phase holographic (VPH) transmission gratings, which can be exploited to improve the throughput of modern spectrographs. The wavelength of peak efficiency can be tuned by adjustment of the incidence angle. We show that the variat…
Abstract Viscosity and cure time of a filled rubber compound having an accelerated sulfur cure system are affected by types and contents of the rubber and the filler as well as of the curatives. Bound rubber content is used as level of the reinforcement. Influence of bound rubber on viscosity and cure time of a rubber…
Metallcluster in einer Proteinkapsel: Solche in situ durch chemische Reduktion von Palladium(II)-Ionen im Apoferritin-Käfig erzeugte Cluster ermöglichen größenselektive Olefin-Hydrierungen wegen der durch die Ferritinkanäle bedingten Größenlimitierung (siehe Schema).
The role of the double-hydrophilic block copolymer poly(ethylen glycol)-block-poly(methacrylic acid) (PEG-b-PMAA) on the morphogenesis of calcium carbonate (CaCO3) was studied by applying the contrast variation small angle neutron scattering technique. The morphology and size of CaCO3 crystals is strongly affected by…
The lyotropic phase behavior of cuboidal particles was investigated via Monte Carlo simulations. Hard cubes were approximated by suitably shaped clusters of hard spheres. Changes in concentration and structure of the system were monitored as a function of osmotic pressure P* (imposed in an isobaric ensemble). As expec…
Biodegradable elastomers represent a useful class of biomaterials. In this paper, we synthesize thermoset elastomers by utilizing the living nature of ring-opening polymerization of a star copolymer of D,L-lactide and epsilon-caprolactone initiated with glycerol and catalyzed by stannous 2-ethylhexanoate. The star cop…
The structure of polymers in the vicinity of spherical colloids is investigated by Monte Carlo simulations and integral equation theory. Polymers are represented by a simple bead-spring model; only repulsive Lennard-Jones interactions are taken into account. Using advanced trial moves that alter chain connectivity, de…
We directly measure the photoinduced insulator-to-metal transition in ${\mathrm{VO}}_{2}$ using time-resolved near-edge x-ray absorption. Picosecond pulses of synchrotron radiation are used to detect the redshift in the vanadium ${L}_{3}$ edge at 516 eV, which is associated with the transient collapse of the low-tempe…
A mild solution method has been designed for the selective synthesis of orthorhombic and hexagonal CeOHCO(3), as well as cubic CeO(2) crystals in an ethanol/water mixed solvent. This study added a new example for selectively controlling different cerium compounds by manipulating the balance between kinetics and thermo…
A comparison is made between the local distortions at room temperature of the $M{\mathrm{O}}_{6/2}$ octahedra in three perovskite $\mathrm{RM}{\mathrm{O}}_{3}$ families in which M is Mn, Fe, or Ni. The comparison distinguishes between distortions arising from cooperative octahedral-site rotation and static Jahn-Teller…
Long-chain-branched isotactic polypropylenes (LCBed PP) were synthesized by copolymerizing propylene with a small amount of nonconjugated α,ω-diene (1,9-decadiene or 1,7-octadiene) using the catalyst system of rac -Me 2 Si(2-MeBenz[ e ]Ind) 2 ZrCl 2 (MBI)/MMAO. In this approach, the LCB structures were introduced by t…
Self-diffusion in a monodisperse suspension of non-Brownian particles in simple shear flow is studied using accelerated Stokesian dynamics (ASD) simulation. The availability of a much faster computational algorithm allows the study of large systems (typically of 1000 particles) and the extraction of accurate results f…
Abstract Organo‐clay polymer nanocomposites offer improved material properties at very low filler loadings making them of immediate interest for application in body panels, claddings, and instrument panels. This improvement in properties requires that the organo‐clay be well dispersed if not completely exfoliated. Con…
Ab initio all-electron molecular-orbital calculations are carried out to study the structures and relative stability of low-energy silicon clusters (Si(n),n = 12-20). Selected geometric isomers include those predicted by Ho et al. [Nature (London) 392, 582 (1998)] based on an unbiased search with tight-binding/genetic…
Abstract The effect of clay concentration on the oxygen permeability and optical properties of a modified poly(vinyl alcohol) (PVOH) was studied. Sodium montmorrilonite (MMT‐Na + ), at a concentration of 10 wt %, was found to decrease the oxygen permeability of the PVOH below 0.001 cc · mil/m 2 /day at 55% relative hu…
Real-time atomic force microscopy observation was carried out during crystallization in thin films of chiral poly(R-3-hydroxybutyrate- co -R-3-hydroxyhexanoate) copolymer, and the development details of single lamellae in the banded spherulites are revealed for the first time. The lamellae exhibit complicated growth b…
The photonic band structure of a three-dimensional lattice of metal spheres is calculated using an embedding technique, in the frequency range of the Mie plasmons. For a small filling factor of the spheres, Maxwell-Garnett theory gives an almost exact description of the dipole modes, and the multipole modes are fairly…
Via computer simulations of the standard binary Lennard-Jones glass former we have obtained in a systematic way a large set of close-by pairs of minima on the potential energy landscape, i.e. double-well potentials (DWP). We analyze this set of DWP in two directions. At low temperatures the symmetric DWP give rise to…