Materials Literature
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Through the polycondensation of a four-functional amine with pyromellitic dianhydride, a hyperbranched polyimide (HPI) was synthesised in this study. The HPI was used for liquid crystal alignment layers. Wide angle X-ray diffraction measurement showed that the HPI film was amorphous. The morphology of the surface laye…
Space Launch Vehicles are subjected to rigor dynamic environment during lift-off and ascent phase of launch. The intense sound generated by the rocket propulsion system exerts significant acoustic pressure which induces vibrations. In addition, intense vibrations are generated by space propulsion engine ignitions, shu…
One of the most frequent causes of failure of overhead high- and medium-voltage transmission and distribution lines is contamination of the insulators with diverse substances such as saline and industrial substances. The contamination mechanically degrades the insulators and affects the electrical characteristics of t…
The experimental neutron and x-ray diffraction data for stoichiometric and S-deficient Ge(x)As(x)S(100-2x) glasses with x = 18.2, 25.0, and 33.3 at.% have been modeled simultaneously using the reverse Monte Carlo (RMC) technique. Nearest-neighbor coordination environments, as obtained in previous x-ray absorption spec…
We report on the electrical resistivity, thermoelectric power, and electronic phase diagram of rhodium-doped NdFeAsO. Rhodium doping suppresses the structural phase transition and spin-density wave observed in the undoped material, and superconductivity emerges at $x$ close to 0.05, despite the distortion of ${\text{F…
A novel nonaqueous route was applied for the synthesis of rare earth phenylphosphonate hybrid nanostructures by reacting rare earth chlorides with phenylphosphonic acid in benzyl alcohol. Powder X-ray diffraction and transmission electron microscopy studies reveal the ordered lamellar structure, with an interlayer dis…
CePO(4):Tb/LaPO(4) nanowires with a core/sheath architecture have been successful synthesized by a facile aqueous chemical method mediated by original CePO(4):Tb aggregation seeds. The seed crystals serve as both a luminescence center and a nucleation site for epitaxial growth. The seed nanocrystals have an irregular…
We report the construction of a molecular recognition layer composed of polyelectrolyte brushes and metal complexes on the surface of a quartz crystal microbalance (QCM) and the sensing abilities for various volatile organic compounds (VOCs). Atom-transfer radical polymerization of 2-(dimethylamino)ethyl acrylate from…
A graphical representation for two-dimensional periodic structures is introduced that provides the full information contained in the dispersion equation: not only for the pass band but for the neighboring stop bands as well. It is a seamless natural extension of Brillouin diagrams obtained by adding eight new zones wh…
The facile synthesis of a novel electron-precise paramagnetic hexamanganese carbonyl selenide cluster [Se(6)Mn(6)(CO)(18)](4-) (1) was discovered, which demonstrates contrasting reactivity toward O(2) and Se(8) under markedly mild conditions to afford the O- and Se-inserted clusters [Se(6)Mn(6)(CO)(18)(O)](4-) (2) and…
Smart catalysts for new materials: A syndiospecific yttrium catalyst that operates by a chain-end-control mechanism enabled the highly alternating ring-opening polymerization of a mixture of two different enantiomerically pure 4-substituted β-propiolactones of opposite absolute configuration (see scheme). This strateg…
p-type Sb-doped ZnO (ZnO:Sb)/n-type Ga-doped ZnO (ZnO:Ga) junctions were grown on c -plane sapphire substrates using plasma-assisted molecular-beam epitaxy. Mesa geometry light emitting diodes (LEDs) were fabricated using standard photolithography and lift-off process, with ohmic contacts achieved using Au/Ni and Au/T…
Doping and temperature dependent studies of optical phonon modes in Fe-122 pnictides are performed using Raman scattering experiments and compared with model calculations to elucidate the role of electron-phonon and spin-phonon interaction in this family of compounds. The frequency and linewidth of the B(1g) mode at a…
We report measurements and analyses of resistivity, thermopower and the Hall coefficient of single-crystalline samples of the layered Rh oxide K(0.49)RhO(2). The resistivity is proportional to the square of the temperature up to 300 K, and the thermopower is proportional to the temperature up to 140 K. The Hall coeffi…
Multilayer technology relies heavily on the chemical compatibility of metal and ceramic. This work focuses on the ceramic–electrode interaction between 92Bi 0.5 Na 0.5 TiO 3 –6 BaTiO 3 –2K 0.5 Na 0.5 NbO 3 [(Bi 0.46 Na 0.47 Ba 0.06 K 0.01 )(Nb 0.02 Ti 0.98 )O 3 ], a promising actuator material and forerunner to an eme…
Growing onions: Formation of onion-type MoS2 fullerenes was monitored by taking TEM snapshots of reaction intermediates in the thermal decomposition of amorphous precursor particles, which led first to giant multiwall fullerenes (d>150 nm) in which, at higher temperature, smaller daughter fullerenes segregated (see TE…
The temperature dependence of $1/f$ noise and resistivity in single-walled carbon nanotube (CNT) films are studied. We find that as the temperature decreases, resistivity monotonically increases whereas $1/f$ noise amplitude first decreases, then increases, reaching a minimum at around 40 K. At temperatures considerab…
Poly(ethylene terephthalate) (PET) fibers are widely used in various fields owing to their good physical properties and chemical resistance, but PET hydrophobicity heavily compromises its use in many applications. Wet-chemical treatments are often required to induce hydrophilicity, but these can damage the polymer mat…
The successful in situ synthesis of platinum nanoparticles (PtNPs) on a microstructured paperlike matrix, comprising ceramic fibers as main framework and zinc oxide whiskers as selective support for the PtNPs, is reported. The as-prepared hybrid material (PtNPs@ZnO "paper") resembles ordinary paper products because it…
Surface enhanced raman scattering (SERS) of triphenylene (TP) has been recorded on Ag nanoparticles functionalized with the molecular assembler bis-acridinium lucigenine dication (LG) which approaches the adsorbate to the metal surface allowing for its detection. Structural information on the host and the analyte can…