Materials Literature
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To functionalize Au MPCs (monolayer-protected gold clusters), ligand place-exchange reactions provide a convenient route in which the initial capping ligands are displaced by mixing the MPCs with an excess amount of incoming ones. However, literature reports show that the diameters of the modified products do not alwa…
Ein neuer Dreh bei Halbleitern: Verdampfen von Na aus ionischem intermetallischem NaSi bei 800 °C führt zur Bildung von doppelhelicalen Silicium-Mikroröhren. Die Röhren nehmen eine verzwillingte Struktur mit Einkerbungen in der Röhrenwand ein und haben nanogranuläre oder glatte Oberflächen. Ein Mechanismus für die Bil…
We demonstrate that in the atomic-scale limit the thermal conductance K of the Fermi-Pasta-Ulam (FPU) model and its variants strongly deviates from the mesoscopic behavior due to the relevance of contact resistance. As a result, atomic chains follow log K=nu log T, where the power-law coefficient nu is exactly two tim…
We examined three united atom models in light of their description of polyolefin dynamics and investigated the relative influence of various potentials on the resulting dynamics. Results were compared with a collection of experimental data on polyethylene, poly(ethylene-alt-propylene), polypropylene, and head-to-head…
Impurities, inevitably present in all samples, induce elastic transitions between quasiparticle states on the contours of constant energy. These transitions may be seen in Fourier-transformed scanning tunneling spectroscopy experiments, sorted by their momentum transfer. In a superconductor, anomalous scattering in th…
Physical and mechanical properties of electrospun polyvinyl alcohol (PVA) were related to electrospinning process parameters through fabricated structures, fiber morphology, and diameters. The effects of electrospinning voltage, flow rate and distance between needle tip and collector on tensile strength, strain at max…
The presence of Fe and S containing compounds inside rust layers covering iron archaeological nails was suspected but their real nature was not clearly determined. However, this finding suggested that sulphate reducing bacteria (SRB) could be involved in the corrosion processes. A thorough study focused on SRB and FeS…
Abstract Polymeric nanocomposites are among the most exciting and promising classes of materials discovered recently. A number of physical properties are successfully enhanced when a polymer is modified with small amount of nanoclay on condition that the clay is dispersed at nanoscopic level. In this research, compara…
Hydrogen gas permeation tests were performed on two Nb-modified Zr alloys used in the nuclear industry. The influence of the microstructure on hydrogen diffusivity in each alloy is discussed and a mechanism of hydride formation is presented. The hydrogen binding energy for different trap sites was calculated in the M5…
We succeeded in fabrication of monodispersed diarylethene nanoparticles using the reprecipitation method and controlling nanoparticle size in the range of 40 nm to 250 nm by changing concentration of the injected solution and viscosity of good solvent. The obtained nanoparticles exhibited photochromism by alternate ir…
An inverse way to define the parameters of cylindrical cloaks is developed, in which the cloaking parameters can be independently obtained without any knowledge of the corresponding coordinate transformation. The required parameters are derived in terms of the integral form of cloaking generators, which are very gener…
Abstract CNT‐induced formation of transcrystals of γ‐PP are reported. Formation of these transcrystals occurred when PP was infiltrated into nanotube aerogel fibers to form polymer nanocomposites. The PP morphology and microstructure with particular focus on the interfacial region of the CNTs were investigated by mean…
Abstract Owing to its good affinity with Ag + , Br – is able to truncate a silver thiolate polymer and induce the formation of a high‐nuclearity silver thiolate nanocluster, [Br@Ag 36 (SC 6 H 4 t Bu‐4) 36 ] – . The nanocluster has a disc‐like structure with one Br – anion trapped at the center of the cluster in an oct…
Carbon nanofibre-reinforced polypropylene nanocomposites containing from 5 to 20 wt.% of carbon nanofibres and a chemical blowing agent were melt-compounded and later foamed using compression-moulding. Alongside their foaming behaviour analysis and cellular characterization, foams showing an increasingly finer isometr…
A series of experiments for undergraduate laboratory courses (e.g., organic, polymer, inorganic) have been developed. These experiments focus on understanding the regiochemistry of the conducting polymer poly(3-hexylthiophene) (P3HT). The substitution patterns in P3HTs control their conformational features, which, in…
Abstract The synthetic procedure and the characterization of the new amino derivatives of poly(oxa‐ p ‐phenylene‐3,3‐phtalido‐ p ‐phenylene‐oxa‐ p ‐phenilene‐oxy‐phenylene) (PEEK‐WC) with various average degrees of substitution, is reported. The amino PEEK‐WC was extensively characterised by using Fourier transform in…
A method has been developed to use the finite escape depth of the photoelectrons emitted in ultraviolet photoemission spectroscopy (UPS) to determine the electronic density-of-states at the interface between two dissimilar metal oxides. Ultrathin films of one oxide are grown heteroepitaxially, one monolayer at a time,…
The curvature effects on the magnetic properties of finite-length zigzag carbon nanotubes and curved nanographenes, where one zigzag edge is nonpassivated and the other zigzag edge is hydrogen passivated, are studied by first-principles methods. Both in finite-length nanotubes and nanographenes the gradual increase in…
Abstract Mock‐ups for the International Thermonuclear Experimental Reactor(ITER) were manufactured by depositing W coatings on tubular substrates of CuCrZr alloy via plasma spraying. An appropriate interlayer (of Ni, Al and Si) was optimised to increase the adhesion of W on the Cu alloy and to provide a soft interface…
Recently, polypyrrole has attracted much attention, because it has a high electroconductivity and can be used in a soft actuator. We have recently succeeded in increasing the expansion and contraction ratio of a polypyrrole film by fabricating a Au/polypyrrole stacked structure, whose polypyrrole film was formed on a…