Materials Literature
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Intramolecular interactions of noncovalent nature in the conjugated oligomers of co-thiophene−thieno[3,4- b ]pyrazine−thiophene and co-thiophene−benzo[ c ]1,2,5-thiadiazole−thiophene are studied quantum mechanically. S···N contacts are identified by the existence of topological bond critical points (bcp's) along the b…
The influence of pH and ionic strength on the structure and properties of hydrogen-bonded layer-by-layer (LbL) assemblies of poly(ethylene oxide) (PEO) and poly(acrylic acid) (PAA) is explored. The degree of inter- and intramolecular hydrogen bonding is estimated from Fourier-transform infrared spectroscopy, the glass…
The oxidation of a vicinal Pd(553) surface has been studied from ultrahigh vacuum (UHV) to atmospheric oxygen pressures at elevated sample temperatures. The investigation combines traditional electron based UHV techniques such as high resolution core level spectroscopy, low-energy electron diffraction, scanning tunnel…
Structural investigations were performed on combustion synthesized CuFe 2 O 4 nanoparticles and CuFe 2 O 4 −MO 2 (M = Sn, Ce) nanocomposites in different compositions, by means of X-ray absorption fine structure spectroscopy. The studies on CuFe 2 O 4 nanoparticles reveal that the samples have a structure analogous to…
The hydrophobic surface properties of structured poly-(p-xylylene) (PPX) films, as measured by water wettability, are studied as functions of surface chemistry, film composition, and surface roughness. We demonstrate the fabrication of very hydrophobic surfaces and control over adhesion properties via nanoscale modula…
Drei Generationen (G0, G1, G2) von dendrimerstabilisierten Pd-Nanopartikeln (PdNPs) wurden durch Klickchemie synthetisiert. Sie katalysieren Suzuki-Reaktionen von PhX (X=I oder Br) bei 25 °C, wobei die katalytische Aktivität mit sinkender Konzentration steigt. Der G0-Katalysator liefert eine Umsatzzahl von 540 000 bei…
$A$-site ordered perovskites $\mathrm{Ca}{\mathrm{Cu}}_{3}{\mathrm{Ge}}_{4}{\mathrm{O}}_{12}$ and $\mathrm{Ca}{\mathrm{Cu}}_{3}{\mathrm{Sn}}_{4}{\mathrm{O}}_{12}$, which are isostructural to antiferromagnetic $\mathrm{Ca}{\mathrm{Cu}}_{3}{\mathrm{Ti}}_{4}{\mathrm{O}}_{12}$, were found to be ferromagnets. The special a…
Abstract This book describes the basic concepts of various physical phenomena in semiconductors and their modulated structures under high magnetic fields. The topics cover magneto-transport phenomena, cyclotron resonance, far-infrared spectroscopy, magneto-optical spectroscopy, diluted magnetic semiconductors in high…
We report a novel nanoscale thermal platform compatible with extreme temperature operation and real-time high-resolution transmission electron microscopy. Applied to multiwall carbon nanotubes, we find atomic-scale stability to 3200 K, demonstrating that carbon nanotubes are more robust than graphite or diamond. Even…
We have measured shot noise in single-walled carbon nanotubes with good contacts at 4.2 K at low frequencies (f=600-850 MHz). We find a strong modulation of shot noise over the Fabry-Perot pattern; in terms of the differential Fano factor the variation ranges over 0.4-1.2. The shot noise variation, in combination with…
The structural evolution of a diamond-type bicontinuous lipid cubic phase upon application of thermal and chemical (hydration agent) stimuli is investigated by means of small-angle neutron (SANS) and X-ray scattering (SAXS). The soft-matter cubic architecture responds by dramatic swelling (DLarge cubic structure) upon…
Colloidal spheres with unique internal morphologies were prepared by blending symmetrical poly(styrene)- block -poly(butadiene) (PS- b -PB) and polystyrene homopolymer ( h PS) in emulsion droplets and carrying out subsequent solvent evaporation. We found various unprecedented microphases in these spherically confining…
The electrostatic layer-by-layer (LbL) assembly approach offers large potential in the area of drug delivery from thin films; however, because the processing technique is aqueous-based, there have been few strategies proposed to incorporate hydrophobic molecules into these films. Here we create an LbL film that is cap…
SiOC and SiBOC polymer-derived glasses show a complex nanostructure in which nanocrystalline β-SiC and sp 2 C coexists with nanoclusters of amorphous SiO 2 or SiO 2 −B 2 O 3 and with mixed silicon oxycarbide and boron oxycarbide units. The characterization of the nanostructure is performed with a multiple technique ap…
We present theoretical study of shot noise in single wall metallic carbon nanotubes weakly coupled to either nonmagnetic or ferromagnetic leads. Using the real-time diagrammatic technique, we calculate the current, Fano factor and tunnel magnetoresistance in the sequential tunneling regime. It is shown that the differ…
Criterion for contacting is critically important for the Generalized Interpolation Material Point(GIMP) method. We present an improved criterion by adding a switching function. With the method dynamical response of high melting explosive(HMX) with cavities under shock is investigated. The physical model used in the pr…
In this work, a study of epitaxial growth was carried out by means of wavelets formalism. We showed the existence of a dynamic scaling form in wavelet discriminated linear MBE equation where diffusion and noise are the dominant effects. We determined simple and exact scaling functions involving the scale of the wavele…
Electromagnetic metamaterials are a class of materials which have been artificially structured on a subwavelength scale. They are currently the focus of a great deal of interest because they allow access to previously unrealisable properties like a negative refractive index. Most metamaterial designs have so far been…
We determined the intrinsic aqueous solubility of 15 poorly soluble drugs with solubilities ranging from 2.9 nM to 1.1 microM. We then analyzed the data from a physicochemical perspective, using experimentally determined solid-state properties and easily interpretable two-dimensional molecular descriptors, to better u…
The critical behavior of some alloys are analyzed within the framework of Heisenbergs model with long-range interaction. On based experimental values of the critical exponent $γ$ we calculate the value of paerameter of long-range interaction.