Materials Literature
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ZnO nanotubes were fabricated by vapor-phase transport using the mixture of ZnO and graphite powders in air. A self-catalyzed growth mechanism was proposed based on microstructure analysis by scanning electron microscopy, transmission electron microscopy, and x-ray diffraction. Raman scattering, integrated photolumine…
The new electrospinning technology Nanospider TM , offering a real potential for industrial production of nanofibers, is used for the preparation of nanofiber sheets from aqueous solutions of polymer blends. The nanofiber sheets are prepared from a mixture of chitosan and polyethylenoxide (PEO) and using the novel con…
Information on preparing multiphase layers on valve metals by the plasma-electrochemical oxidation and deposition from aqueous electrolytes containing polyphosphate and fluoride metal complexes, iso-and heteropolyoxoanions, as well as electrolytes evolving solid precipitates, is summarized. Possible application fields…
We present an analytical device model for a field-effect transistor based on a heterostructure, which consists of an array of nanoribbons clad between the highly conducting substrate (the back-gate) and the top gate controlling the source-drain current. The equations of the model of a grapheme-nanoribbon field-effect…
The linear natural and forced oscillations of a compressible hemispherical bubble on a solid substrate are under theoretical consideration. The contact line dynamics is taken into account by application of the Hocking condition, which eventually leads to nontrivial interaction of the shape and volume oscillations. Res…
Co 1- x Zn x Fe 2 O 4 nanoparticles, prepared by the polyvinyl alcohol sol—gel method, have been investigated by x-ray diffraction and Mössbauer spectroscopy. These results are compared with those for the bulk material. The lattice parameters of CoZn ferrite nanoparticles are larger than those of the bulk material. Th…
The dependency of hydrogen environment embrittlement on applied potential of an ultrahigh-strength steel was explained. This is accomplished through (1) definition of crack chemistry and potential; (2) development of a database of diffusible hydrogen concentration (CH,diff) as a function of local chemistry and potenti…
Ab-initio molecular dynamics simulation of forsterite (Mg 2 SiO 4 ) melt at 2273 K shows the presence of nearly 40% of the Si atoms as (Si 2 O 7 ) 6- dimers. This result is directly corroborated by the 29 Si nuclear magnetic resonance spectrum of bulk Mg 2 SiO 4 glass, prepared by container-less levitation techniques.…
Binary chromophore systems represent a new and very promising class of organic second-order nonlinear optical (electro-optic) materials, where favorable intermolecular electrostatic interactions lead to significantly enhanced electro-optic coefficients and to other favorable physical properties such as low optical los…
Small aluminum oxide cluster cations and anions, produced by laser vaporization, were investigated regarding their reactivity toward CO and N2O employing guided-ion-beam mass spectrometry. Clusters with the same stoichiometry as bulk alumina, Al2O3, exhibited atomic oxygen transfer products when reacted with CO, sugge…
This topical review is intended to describe the x-ray techniques used for human soft tissue analysis. X-ray techniques have been applied to human soft tissue characterization and interesting results have been presented over the last few decades. The motivation behind such studies is to provide improved patient outcome…
Superparamagnetic iron oxide nanoparticles (SPIOs) have been produced and used as a potent and versatile contrast media for magnetic resonance imaging (MRI). Despite a number of efforts to improve their surface chemistry and biocompatibility, the SPIOs half life in blood circulation is very short and they are rapidly…
Space charge measurements using electro-acoustic techniques have dramatically improved in the past 20 years. They have revealed many interesting phenomena in dielectrics. The author believes that the technique is progressing continuously, and that the progress expands the range of applications and raises new topics in…
Highly c axis oriented zinc oxide (ZnO) thin films have been prepared on 1737 Corning glass substrate by planar rf magnetron sputtering under varying pressure (10–50mTorr) and different oxygen percentage (40%–100%) in reactive gas mixtures. The as-grown ZnO thin films were found to have stress over a wide range from −…
Monodisperse and size-tunable hollow silver spheres have been successfully synthesized with phase-transformable emulsions of natural beeswax as templates. Because beeswax is a hard and tough aggregate consisting of multiple small molecules and has a relatively low phase-transformable temperature, this method has the a…
We present novel three-dimensional (3D) hierarchical ZnO and ZnAl 2 O 4 nanostructures produced by multitransformation reactions using Zn as the starting material. In two representative instances selected for illustrating this strategy, various Zn precursors like Zn nanowires and polyhedral Zn microcrystals were first…
A new process to form thick and dense ultra‐high‐temperature ceramic (UHTC) composite coatings over SiC surfaces is described. Coatings of ZrB 2 /SiC/(ZrC) thicker than 100 μm are formed by a reaction‐bonded SiC (RBSC) approach based on Si infiltration into ZrB 2 /C preform coating. The residual Si, typically found in…
Spectroscopic properties of thulium-doped germanate, silica, and phosphate glasses were measured and compared since such glasses are of interest as materials for fiber lasers in the eye-safe wavelength region. F43 excited state fluorescence decay dynamics was investigated at temperatures from 8to300K and the results r…
Particulate composites of Li0.5Co0.75Fe2O4 and BaTiO3 with mixed structure have been synthesized by the normal ceramic method with a variation of the molar percentages. X-ray diffraction was used to carry out the structural analysis and confirm the presence of constituent phases in the composites. The dc resistivity w…
By performing Raman spectroscopic and electrochemical measurements along the nanotube length, we have demonstrated that there is a concentration gradient of structural defects along the tube length for super-long (ca . 5 mm) vertically aligned double-walled carbon nanotubes (SLVA-DWNTs) produced by water-assisted CVD…