Materials Literature
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We describe the design of polycyclic aromatic compounds with high performance that dissolve single-walled carbon nanotubes (SWNTs). Synthetic amphiphiles trimethyl-(2-oxo-2-phenylethyl)-ammonium bromide (1) and trimethyl-(2-naphthalen-2-yl-2-oxo-ethyl)-ammonium bromide (2) carrying a phenyl or a naphtyl moiety were no…
The photoluminescence dynamics of colloidal CdSe/ZnS/streptavidin quantum dots were studied using time-resolved single-molecule spectroscopy. Statistical tests of the photon-counting data suggested that the simple "on/off" discrete state model is inconsistent with experimental results. Instead, a continuous emission s…
The bactericidal effect of photocatalysis with TiO2 is well recognized, although its mode of action is still poorly characterized. It may involve oxidation, as illuminated TiO2 generates reactive oxygen species. Here we analyze the bactericidal effect of illuminated TiO2 in NaCl-KCl or sodium phosphate solutions. We f…
Intracellular uptake and degradation of polyelectrolyte capsules is reported in this work. Two types of intracellular degradable capsules are described: enzyme-sensitive and hydrolysis- sensitive capsules (see figure). The results may be a significant step towards the biomedical application of polyelectrolyte capsules.
A drop of water thrown on a super-hydrophobic solid will often bounce off. Here we discuss the conditions to be fulfilled on the surface design (which provides super-hydrophobicity) to observe such a behavior. This allows us to precise how a material can be made water-repellent. We show in particular how the reduction…
We present an experimental and theoretical study of the fluorescence rate of a single molecule as a function of its distance to a laser-irradiated gold nanoparticle. The local field enhancement leads to an increased excitation rate whereas nonradiative energy transfer to the particle leads to a decrease of the quantum…
The spectra of collective excitations of liquid and glassy tellurium have been studied by means of inelastic neutron scattering. Here we report on the dynamics of liquid Te as measured at two different temperatures, just above melting $({T}_{m}=723\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ and at $\ensuremath{\sim}1000\p…
The optical properties of barium strontium titanate (Ba0.7Sr0.3TiO3; BST) thin films are described. The BST thin films were epitaxially grown upon MgO (001) substrates by pulsed laser deposition. The crystallographic properties of the BST thin films were examined by x-ray diffraction. The BST thin films were highly op…
We report the fabrication of three-dimensional lattices of bipolar nematic liquid crystal droplets. The electro-optic properties of these materials consist of transitions between opaque, Bragg diffracting, and transparent states. These occur continuously at moderate electric (E) fields through bipolar axis rotation of…
Abstract Blending systems based on polypropylene (PP) and ultrahigh‐molecular‐weight polyethylene (UHMWPE) were prepared via a melt extrusion by the four‐screw and the twin‐screw extruders, respectively. The mechanical evaluation demonstrated that the synchronous toughening and reinforcing effects could be achieved fr…
Memory in ferroelectric liquid crystals (FLCs) is well known in the literature where thickness of the cell is less than the pitch value of the material. Here, we report a thickness independent memory in a class of FLCs called the de Vries electroclinic liquid crystals. Thickness independency of memory effect is observ…
A temperature-dependent x-ray absorption spectroscopy (XAS) study was performed to investigate the changes in electronic and atomic structure of La-deficient ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.2}\mathrm{Fe}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ (L7S2FO3) and stoichiometric ${\mathrm{La}}_{0.8}{\mathrm{Sr…
Abstract The objective of this work is to understand the effect of shear force on the properties of epoxy–clay nanocomposites. The shear force was controlled by changing the revolutions per minute on a mechanical mixer. Differences in the aspect ratio of clay layers and differences of clay particle distribution in the…
What happens in between? A nonanuclear gallium(III) cluster (see structure: white H, gray C, red O, orange Br, beige Ga) is a potential intermediate in the assembly of a dinuclear helicate. The cluster could be isolated because of conformational restrictions at the ligand which disfavor the formation of the triple-str…
Abstract Environmental concerns associated with the level of volatile organic compounds used in surface coatings have stimulated increased scientific research toward novel methods of developing environment‐friendly coatings. Prototype wood finish products containing polymerized whey proteins (PWP) were formulated. The…
Effiziente Leuchtstoffe finden sich bei Verbindungen aus der Familie β-NaLnF4 (Ln=Y, La–Lu). Durch Kombination von Einkristall-Tieftemperaturabsorption und diffuser Röntgenstreuung konnten zwei kristallographisch nicht äquivalente spektroskopische Lagen eindeutig identifiziert werden. Die hohe Lichtausbeute dieser Leu…
Abstract Biaxially oriented linear low density polyethylene (LLDPE) films were produced using the double bubble process with different machine direction (MD) orientation levels and the same transverse direction (TD) blow‐up ratio. Their mechanical behavior was characterized in terms of the tensile strength and tear re…
Psoralen photophysics has been studied on quantum chemistry grounds using the multiconfigurational second-order perturbation method CASPT2. Absorption and emission spectra of the system have been rationalized by computing the energies and properties of the low-lying singlet and triplet excited states. The S1 pipi* sta…
Abstract Summary: SAXS was used to investigate the morphological responses of two commercial thermoplastic poly(ether‐ co ‐urethane) elastomers during repeated uniaxial extension and stress‐relaxation at constant strain. Experimental data was analysed using a ‘globular’ morphological model, which has previously been s…
Einfach, aber gut: Das leicht zu handhabende und umweltverträgliche Oxone erzeugt Singulettsauerstoff, der unter milden Bedingungen selektiv und mit guten bis ausgezeichneten Ausbeuten para-Alkylphenole 1 oxidativ zu para-Peroxychinolen 2 desaromatisiert. Auch para-Chinole 3 können in einem Eintopfverfahren aus 1 durc…