Materials Literature
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Site-specific functionalization of oxide nanostructures gives rise to novel optical and chemical surface properties. In addition, it can provide deeper insights into the electronic surface structure of the associated materials. We applied chemisorption of molecular hydrogen, induced by ultraviolet (UV) light, followed…
The poly(isocyanide) skeleton is shown to be a good support for assemblies of molecular units which permit p-type charge transport. A poly(isocyanide) containing tetrathiafulvalene (TTF) moieties in the side chains has been synthesized and characterized in its neutral state and has been oxidized to generate mixed vale…
Highly-conductive organic charge-transfer complex films are successfully fabricated by an inkjet printing technique in which the soluble donor and acceptor components are printed individually and combine on the substrate to form complex films. The method enables us to produce conductive (10 S/cm) tetrathiafulvalene-te…
Abstract Scaling predictions for bottle‐brush polymers with a rigid backbone and flexible side chains under good solvent conditions are discussed and their validity is assessed by a comparison with Monte Carlo simulations of a simple lattice model. It is shown that typically only a rather weak stretching of the side c…
The psychrophilic cellulase, Cel5G, from the Antarctic bacterium Pseudoalteromonas haloplanktis is composed of a catalytic module (CM) joined to a carbohydrate-binding module (CBM) by an unusually long, extended and flexible linker region (LR) containing three loops closed by three disulfide bridges. To evaluate the p…
We present a hybrid protocol designed to couple the dynamics of a nanoscopic region of liquid described at atomistic level with a fluctuating hydrodynamics description of the surrounding liquid. The hybrid technique is based on the exchange of fluxes and it is shown to respect the conservation laws of fluid mechanics.…
We propose and analyze a physical mechanism for photogeneration of multiexcitons by single photons (carrier multiplication) in semiconductor nanocrystals, which involves intraband optical transitions within the manifold of biexciton states. In this mechanism, a virtual biexciton is generated from nanocrystal vacuum by…
We report physical properties of the conductive oxide PdCoO 2 in the layered delafossite structure through measurements of the electrical resistivity, specific heat, magnetic susceptibility, polarized Raman spectra and infrared absorption. We observed two prominent Raman peaks at 520 and 712 cm -1 . The presence of th…
To establish the validity of various proposed structural models, we have investigated the structure of the binary ${\mathrm{As}}_{x}{\mathrm{Se}}_{100\ensuremath{-}x}$ chalcogenide glass family $(x\ensuremath{\leqslant}40)$ by high-resolution x-ray photoelectron spectroscopy. From the composition dependence of the val…
Blood coagulates faster upon contact with polar glasslike surfaces than on nonpolar plastic surfaces; this phenomenon is commonly termed the glass effect. However, the variable hemostatic response that we report here for contact-activated coagulation by different metal oxides, all of which are polar substrates, requir…
Quantum dot light-emitting diodes with high external quantum efficiency and luminous power efficiency are realized through in situ thermal annealing of a quasi-monolayer of colloidal nanocrystals on a crosslinked hole-transport layer. Partial desorption of quantum-dot surface ligands and improved film morphology contr…
By identifying the carbon atoms in close proximity to the mineral suface in bone, solid-state NMR shows that the vital interface between it and the organic matrix is principally polysaccharide and not protein. The discovery has implications for bone health and design of osteomimetic materials.
In situ Raman experiments together with transport measurements have been carried out on carbon nanotubes as a function of gate voltage. In metallic tubes, a large increase in the Raman frequency of the G(-) band, accompanied by a substantial decrease of its linewidth, is observed with electron or hole doping. In addit…
The photoinduced isotropic (PHI) state of cholesteric liquid crystals (CLCs) induced by the UV irradiation of a highly doped (azobenzene liquid crystal) CLC can be stable for tens of hours dominated by the lifetime of the cis isomers. Low-power laser light can be used to write complex 2D images (a car is shown), where…
Full-color mesophase silicate thin film phosphors incorporated with rare earth ions and photosensitizers exhibit multicolor photoluminescence that covere the whole visible range under UV excitation. The multiple colors can be finely tuned by varying the relative concentrations of the RE trivalent ions and photosensiti…
A self-releasing technique combining the catalytic growth of carbon nanotubes by chemical vapor deposition with an oxidation step is used to obtain ultrathick freestanding carbon nanotube films. Several millimeter thick films, such as the one depicted in the figure, are grown by controlling the gas flow rates and the…
Direct measurements of the acceleration of spheres and disks impacting granular media reveal simple power law scalings along with complex dynamics which bear the signatures of both fluid and solid behavior. The penetration depth scales linearly with impact velocity while the collision duration is constant for sufficie…
SmCo5 magnets are synthesized by the facile Ca reduction of core/shell-structured Co/Sm2O3 nanoparticles, as schematically illustrated in the figure. The magnets exhibit coercivities reaching 24 kOe at 100 K and 8 kOe at room temperature. The synthesis represents an important first step towards the fabrication of SmCo…
Molecular-acceptor doping of polythiophene results in high conductivity, ca. 1 S cm–1, in solution-processed thin films. Charge-transfer complex formation leads to new hybrid orbitals (see figure), which are derived from the highest occupied level of the donor (polythiophene) and the lowest unoccupied level of the acc…
Inhibition of efflux pumps is an emerging approach in cancer therapy and drug delivery. Since it has been discovered that polymeric pharmaceutical excipients such as Tweens or Pluronics can inhibit efflux pumps, various other polymers have been investigated regarding their potential efflux pump inhibitory activity. Am…