Materials Literature
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Energy dispersive extended X-ray absorption fine structure spectroscopy (ED-XAFS), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and mass spectrometry (MS), have been combined for the structure-function study of Rh and RhPd supported catalysts for the reduction of NO by CO. The combined results…
The on-off optical gain measurements as a function of the pump power were performed on porous silicon planar waveguides codoped by erbium and ytterbium ions. These measurements were obtained for different ratios of Yb concentration to Er concentration. The highest value of the gain was reached when the Yb concentratio…
The Aharonov-Bohm effect on optical absorption of light polarized perpendicularly to the tube axis in semiconducting carbon nanotubes is studied by taking account of exciton and depolarization effect within an effective-mass approximation. The excitation energy and oscillator strength exhibit weak and quadratic depend…
Abstract The crown‐ether functionalized 2‐( N ‐acetyl‐ N ‐arylaminomethylene)benzo[ b ]thiophene‐3(2 H )‐ones exhibit photochromic behavior involving photoinitiated Z/E ‐isomerization around the exocyclic CC bond followed by a fast thermal N → O acetyl migration and syn → anti isomerization of the resulting kinetical…
Oriented polycrystalline BiFeO3 (BFO) films are deposited on single crystal LaAlO3 (001) substrates by nebulized spray pyrolysis technique at low temperature of ∼300°C. Annealing of the as deposited films in air and oxygen at ∼550°C for 1h is found to produce crystallization and BFO phase formation. X-ray diffraction…
High-voltage vacuum insulator failure is generally due to surface flashover rather than insulator bulk breakdown. Vacuum surface flashover is widely believed to be initiated by a secondary electron emission avalanche along the vacuum-insulator interface. This process requires a physical mechanism to cause secondary el…
This study reports the design, fabrication, and characterization of a tachometer utilizing magnetoelectric (ME) laminate composites with sandwich structure consisting of Pb(Zr,Ti)O3 (PZT) and Galfenol. High temperature characterization of Galfenol shows that it can sustain the magnetic property over 500°C. The Curie t…
Solvatochrome Gele: Merocyanin-Farbstoffe mit einer gelbildenden Cholesterin-Gruppe aggregieren im unpolaren Cyclohexan und im polaren Aceton zu nanoskopischen Fasern und bilden Organogele, die infolge einer Exzitonenkopplung deutlich veränderte optische Eigenschaften aufweisen. Der Wechsel resultiert aus einer unters…
Abstract The amino substituted gallatetrahedranes described herein, Ga 4 (tmp) 4 [tmp = 2,2,6,6‐(tetramethylpiperidino)] and Ga 4 [N(SiMe 3 )dipp] 4 (dipp = 2,6‐diisopropylphenyl), are the first oligomeric gallium(I) amides to be reported. These compounds are formed in a facile manner from “GaI”. A new hexagallane wit…
The wetting of amorphous poly(dimethylsiloxane) (PDMS) surfaces by water has been studied using molecular dynamics simulations. PDMS surfaces were generated by compressing a long PDMS chain between two elastic boundaries at atmospheric pressure. Oxidation of the PDMS surface, achieved in real systems by exposure to ai…
Dielectric relaxation spectroscopy experiments have been performed in a polyimide (PI) in order to measure its electrical conductivity from 200to400°C. The high temperature static (dc) conductivity in PI appears as superimposed by electrode polarization due to the building up of thin space-charge capacitor layers at t…
We present calculations of the laser-induced force between metallic nanospheres, similar and dissimilar in character, and that between a metallic nanosphere and a planar surface. When the separation between these objects is in the 0.5-2 nm range, we find very strong resonances in the laser-induced force associated wit…
Incorporation of sulphur in silicate glasses produced by reactions between melts and sulphur‐bearing sources at high temperatures was studied by X‐ray absorption near edge structure (XANES) spectroscopy at the sulphur K edge. Three types of syntheses were performed using sodium trisilicate, soda lime silicate, and flo…
The availability of well defined inorganic nanocrystals allows the construction of aligned structures with characteristic architectural elements in the nanometer range, the mesoscale. Contrary to alignment driven by external conditions and fields, we focus on strict "self-effects", where the organization is already en…
The authors report on the growth of organometallic dots for optical applications using electron beam induced gold deposition on a transparent substrate. The effects of the substrate material and the deposition parameters, such as beam current and water vapor pressure, on both the deposition rate and gold purity are in…
In this letter, the authors demonstrate reversible color switching from blue to red in polymer stabilized chiral nematic liquid crystals when viewed at oblique angles. A series of unusual colored scattering states, different from those noted in polymer-free samples, was observed in cells that had been prepared using a…
The amorphous carbon film/n-Si (a-C∕Si) junctions have been fabricated by magnetron sputtering. The results show that these junctions have good rectifying properties and high ammonia (NH3) gas sensitivity. For a given reverse bias voltage, the resistance of the junction can increase by 100 times rapidly when exposed t…
We fabricated c ‐axis‐oriented KSr 2 Nb 5 O 15 (KSN) ceramics using a rotating strong magnetic field with subsequent sintering. The degree of orientation of the green compact was about 0.1 for (00 l ), as evaluated from the Lotgering factor in X‐ray diffraction. The orientation of the structure was enhanced by sinteri…
Porous anodic films on aluminium have attracted much recent attention with a view to the generation of templates with ordered nanoporosity. The present work addresses the mechanism of film formation and pore development, through examination of films formed in phosphoric acid, with focus on the influence of current den…
ZnO nanorod arrays with perfect order and uniformity were prepared using a simple, low-cost, commonly available and scalable nanosphere lithography for patterning gold catalyst particles and a successive bottom-up growth technique in a tube furnace chemical vapor deposition system. Each rod in the arrays had perfect s…