Materials Literature
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By visualization of the Barkhausen effect using magnetic force microscopy we are able to provide detailed information about the physical principles that govern the magnetization reversal of a granular ferromagnetic thin film with perpendicular anisotropy. Individual Barkhausen volumes are localized and distinguished a…
Platinum and palladium dendrimer-encapsulated nanoparticles (DENs) were prepared within commercially available, fourth-generation, amine-terminated, poly(amidoamine) dendrimers (G4-NH2). The synthesis is carried out by selectively encapsulating metal complexes within the dendrimer and then reducing the resulting compo…
Single-walled nanotubes (SWNTs) industrially produced and multiwalled nanotubes (MWNTs) we produced by catalysis were investigated by transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. The observed spectral features, that is the peak position, intensity, and bandwidth, were rela…
Recently we performed a numerical investigation of antireflection coatings that reduce significantly the reflection over a wide range of wavelengths and angles of incidence, and we proposed some experiments to demonstrate their feasibility. We provide a theoretical description of omnidirectional antireflection coating…
Long rod-shaped M13 viruses were used to fabricate one-dimensional (1D) micro- and nanosized diameter fibers by mimicking the spinning process of the silk spider. Liquid crystalline virus suspensions were extruded through the micrometer diameter capillary tubes in a cross-linking solution of glutaraldehyde. Resulting…
We present a scheme for the calculation of linear optical properties by the all-electron full-potential linearized augmented planewave (LAPW) method. A summary of the theoretical background for the derivation of the dielectric tensor within the random-phase approximation is provided together with symmetry consideratio…
The nanostructural and elastic properties of a single polymeric nanofiber extracted from a nanofibrous scaffold are investigated using atomic force microscopy (AFM). AFM imaging of the nanofibers reveals a “shish-kebab” structure. A portion of the nanofiber is suspended over a microscale groove etched on a silicon waf…
A one-dimensional metamaterial is realized using three connected Ω rings printed back-to-back and reversed on two sides of a dielectric substrate. Both transmission and prism experiments are reported, yielding concordant results of the presence of a left-handed frequency band. Experiments show reduced losses and an en…
Gallium-doped nanostructural zinc oxide fibers have been fabricated by vapor-phase transport method of heating the mixture of zinc oxide, gallium oxide, and graphite powders in air. The zinc oxide fibers grew along [002] direction, forming a vertically aligned array that is predominantly perpendicular to the substrate…
The photovoltaic parameters of donor/acceptor blend organic solar cells are highly influenced by several parameters, such as the strength of the acceptor species, the morphology of the film due to the solvent, and the mobility of the free charge carriers. In this work, the open-circuit voltage (Voc) of solar cells bas…
High-performance enhancement-mode semiconducting carbon nanotube field-effect transistors (CNTFETs) are obtained by combining ohmic metal−tube contacts, high-dielectric-constant HfO 2 films as gate insulators, and electrostatically doped nanotube segments as source/drain electrodes. The combination of these elements a…
Many-electron effects often dramatically modify the properties of reduced dimensional systems. We report calculations, based on an ab initio many-electron Green's function approach, of electron-hole interaction effects on the optical spectra of small-diameter single-walled carbon nanotubes. Excitonic effects qualitati…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract The inclusion of 3d‐impurities Mn(II), Co(II), Ni(II) and Cu(II) in a crystalline precipitate of ZnC 2 O 4 ·2H 2 O is investigated. This study is a part of the systematic one deal with the mechanism of inclusion of 3d‐ions in sparingly soluble oxalate systems. The experiments are carried out in bi‐ end multi‐…
Abstract The influence of the Cu‐content in the quaternary compounds Cu x Ag 1‐ x InTe 2 (0 ≤ x ≤1) on the structural properties of the bulk material was discussed. Bulk ingot materials of Cu x Ag 1‐ x InTe 2 solid solutions ( x = 0.0, 0.25, 0.50, 0.75 and 1.0) have been synthesized by fusion of the constituent elemen…
Pig heart mitochondrial NADP-dependent isocitrate dehydrogenase requires a divalent metal ion for catalysis, and metal-isocitrate is its preferred substrate. On the basis of the crystal structure of the enzyme-Mn(2+)-isocitrate complex, Asp(252), Asp(275), and Asp(279) were selected as targets for site-directed mutage…
Light scattering, rheology, and atomic force microscope (AFM) studies have been performed on solutions of a polyampholyte (gelatin) prepared in water-ethanol marginal solvent. At ethanol concentration approximately 45+/-2% v/v anomalous aggregation led to formation of fractal (on hydrophilic substrates; glass, quartz…
Abstract A new and simple route to synthesize Lead sulfide (PbS) crystals with the clover‐like structure was described in the current paper. PbS was prepared in a simple aqueous solution employing (CH 3 COO) 2 Pb and thiourea as the initial materials under 130 W microwave irradiation. No any surfactant or template inc…
Abstract The first three even moments of the phonon density of states of LiGaO 2 and the anharmonic contribution to the heat capacity at constant volume of the compound are estimated from experimental heat capacity data. The effect of lattice anharmonicity is discussed in terms of perturbation theory. The temperature…
Abstract The impact of a rotating magnetic field (RMF) on the axial segregation in Vertical Gradient Freeze (VGF) grown, Ga doped germanium is investigated. Growth experiments were performed using the VGF‐RMF as well as the conventional VGF technique. Carrier concentration profiles characterising the Ga segregation we…