Materials Literature
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Ein Stück oder zwei! Durch selektives Ätzen verzwillingter Keime, das durch HCl und Luftsauerstoff vermittelt wird, sind perfekte einkristalline Silbernanowürfel in hohen Ausbeuten und unterschiedlichen Größen (30–130 nm) zugänglich. Das Chloridion verstärkt die Oxidation und verhindert die Aggregation, das Proton ver…
Phase resolved partial discharge measurements offer excellent possibilities to characterize the properties of defects in insulation materials. The appearance of the partial discharge pattern reflects the defect's geometry, the availability of the initial electron, and the properties of the contributing materials. With…
The exponential correlation function is theoretically incorrect in the entire frequency range of interest for processes described in terms of linear response theory. The Lorentzian lineshape results from an inconsistent assumption of exponential correlation at timescales smaller than the relaxation time. A new correla…
We report on the fabrication and current-voltage (IV) characteristics of very narrow, strip-like arrays of metal nanoparticles. The arrays were formed from gold nanocrystals self-assembled between in-plane electrodes. Local cross-linking of the ligands by exposure to a focused electron beam and subsequent removal of t…
This paper investigates the thermal stability of single and multi-walled carbon nanotubes (CNTs). The modeling and simulation of the problem are carried out using molecular dynamics simulation incorporating the Berendsen thermostat scheme for both open-ended and close-capped CNTs. It is found that single-walled CNTs a…
We use experiment and theory to demonstrate a mechanism for directive emissions, which involves a double-plate resonance cavity made with metamaterials. In contrast to other mechanisms employing Fabry-Pérot cavities, photonic crystals, or zero index materials, our system is significantly thinner than the working wavel…
We measured the bias stress characteristics of poly(thiophene) semi-crystalline thin-film transistors (TFTs) as a function stress times, gate voltages and duty-cycles. At room temperature, the bias stress has two components: a fast reversible component and a slow irreversible component. We hypothesize that the irrever…
The fluctuation-dissipation relation (FDR) is measured on the dielectric properties a polymer glass (polycarbonate). It is observed that the fluctuation dissipation theorem is strongly violated for a quench from above to below the glass transition temperature. The amplitude and the persistence time of this violation a…
The origins of an ultrahigh dielectric constant in polycrystalline CaCu3Ti4O12 (CCTO) were studied using the combination of impedance spectroscopy, electron microscopy, and scanning probe microscopy (SPM). Impedance spectra indicate that the transport properties in the 0.1Hz–1MHz frequency range are dominated by a sin…
We propose an equivalent circuit representation of the photogenerated charge separation and propagation in dye sensitized polycrystalline semiconductor in contact with a redox electrolyte. The suggested equivalent circuit for this type of photocell is based on an electrical transmission-line, and uses distributed phot…
Au nanoparticles, prepared by thermal evaporation under high vacuum condition on Si substrate, are irradiated with Au ions at different ion energies. During ion irradiation, embedding of nanoparticles as well as ejection of nano-clusters is observed. Ejected particles (usually smaller than those on the Si substrate) d…
Rheological properties, especially 'shear-thinning', of dense colloidal dispersions are discussed on three different levels. A generalized phenomonological Maxwell model gives a broad framework connecting glassy dynamics to the linear and non-linear rheology of dense amorphous particle solutions. First principles mode…
One lump or two! Selective etching of twinned seeds, mediated by HCl and the oxygen in air, resulted in high yields of perfect single-crystal silver nanocubes in a range of sizes (30–130 nm). The chloride ion enhances oxidation and prevents aggregation, while the proton decreases the rate of reduction and facilitates…
A simple model for solid friction is analyzed. It is based on tangential springs representing interlocked asperities of the surfaces in contact. Each spring is given a maximal strain according to a probability distribution. At their maximal strain the springs break irreversibly. Initially all springs are assumed to ha…
Magnetic domain walls in thin films can be well analyzed using polarized neutron reflectometry. Well defined streaks in the off-specular spin-flip scattering maps are explained by neutron refraction at perpendicular Néel walls. The position of the streaks depends only on the magnetic induction within the domains, wher…
Hexapotassium dihydrogen monotitanoundecatungstocobaltate(II) tridecahydrate, K6H2[TiW11CoO40]·13H2O, crystallizes from aqueous solution in the cubic space group P\overline{4}3m. The structure was refined as an inversion twin. The [TiW11CoO40]8− anion has a Keggin structure with one W-atom site occupied by titaniu…
A tremendous effort has been devoted in the past two decades to the preparation and study of molecule-based materials derived from organometallic or metalorganic species. The work described in this paper is directed to the study of vapor deposited and electrodeposited thin films of these systems. Amorphous thin films…
The organically templated compound (NH 4 ) 3 (4,4′-Hbpy)[(V IV O) 6 ( μ 4 -O) 2 ( μ 3 -OH) 2 ( μ 3 -SO 3 ) 4 ( μ -SO 3 )]·15/2 H 2 O 1 is the first example of an extended structure in which a polyoxometalate anion, [H 2 V 6 IV S 4 IV O 22 ] 2– , is linked by the pyramidal μ 2 -bridging sulfite group forming a linear p…
The structure of amorphous Ge 15 Te 85 has been studied by neutron and x-ray diffraction. Experimental data have been modelled simultaneously with the reverse Monte Carlo simulation method. The contrast between structure factors together with the application of some plausible physical constraints allowed the separatio…
The three-dimensional structures of NAD-dependent D-lactate dehydrogenase (D-LDH) and formate dehydrogenase (FDH), which resemble each other, imply that the two enzymes commonly employ certain main chain atoms, which are located on corresponding loop structures in the active sites of the two enzymes, for their respect…