Materials Literature
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The crystal structure of a high pressure polymorph of CaAl 2 O 4 has been investigated using laboratory X-ray powder diffraction data. The compound was prepared from a ceramic precursor in a piston cylinder apparatus at 800 °C and 20 kbar. The quenchable so-called phase-II of monocalcium aluminate adopts the monoclini…
Abstract NdFeB/α‐Fe nanocomposite magnetic powders were prepared by sonochemical process. The powders were then submitted to a hot press and subsequent hot deformation process by spark plasma sintering (SPS) technique. Effect of α‐Fe content on structure and magnetic properties of both isotropic and anisotropic magnet…
Successful rehabilitation of transverse cracked hot mix asphalt (HMA) pavements has been a challenge for state DOTs. Conventional thin HMA overlays allow the rapid return of the existing transverse cracks and thicker HMA overlays are cost prohibitive. Cold In-Place Recycling (CIR) has been shown to be a cost-effective…
Abstract A multi-methodological study, based on electron microprobe analysis (in wavelength dispersive mode), single-crystal X-ray diffraction (XRD), transmission electron microscopy and single-crystal Fourier transform infrared spectroscopy was performed in order to describe the crystal chemistry of four leucite samp…
Layered double hydroxides (LDH) are a class of ionic lamellar solids with positively charged layers of two kinds of metallic cations and exchangeable hydrated anions. Quasi-elastic neutron scattering (QENS) measurements are performed in this type of LDH structured hydrated hydrotalcite sample to study the dynamical be…
Abstract We report scanning tunneling microscopy (STM) study of surface electronic properties and charge ordering of epitaxially grown magnetite, Fe 3 O 4 , (001) films exhibiting high density of antiphase domain boundaries (APBs). STM measurements using a W tip reveal surface termination at B‐sites. Fe ions with a 0.…
El presente trabajo est abocado al estudio morfolgico, taxonmico y distribucional de las especies de diatomeas pertenecientes a los gneros Asterionellopsis, Cerataulina, Ceratoneis y Leptocylindrus halladas en aguas costeras
Abstract The use of silicon-based ceramics in power generation applications is limited by recession of the passivating SiO 2 when it reacts with water-vapor to form a volatile hydroxide. Environmental barrier coatings are used to prevent diffusion of reactive species to the structural ceramic substrate. Often these ba…
X-ray powder diffraction technique and the Rietveld refinement method have been used successfully for the qualitative and quantitative analyses of Pingguo bauxite from Guangxi, China. Qualitative phase analysis shows that the Pingguo bauxite contains diaspore (AlOOH), hematite (Fe 2 O 3 ), goethite (FeOOH), anatase (T…
The relation between the optical anisotropy of rubbed polyimide layers and the rubbing process is investigated using the recently developed polarization‐conversion guided mode technique. Results indicate that the effective optical anisotropy of the polyimide layers may be substantially changed by the rubbing process,…
Cellulose esters with linear aliphatic acyl substituents [C8 (octanoyl chloride) to C18 (stearoyl chloride)] were synthesized in homogeneous solution (DMAc/LiC1) using triethylamine (TEA) as acid-scavenger and characterized by means of elemental analysis, FT-IR and CP/MAS 13 C Solid State NMR spectroscopy. Wide angle…
Using synchrotron radiation, a single crystal investigation has been performed at 293 and 100 K for the structural characterization of the manganoan pectolite, Na(Ca 1.73 Mn 0.27 )[Si 3 O 8 (OH)] (from the pegmatite at Mt. Koashva, Khibiny alkaline massif, Kola peninsula, Russia). The data obtained are compared with o…
Hydroxyapatite/detonation nanodiamond composites are created on silica glass and cover glass by simple soaking process in an open deposition type set-up. The supersaturated solution (simulated body fluid, SBF) is prepared in a way to resemble the composition of human blood plasma. The composite growth is carried out t…
Abstract The magnetotransport properites of individual ferromagnetic nanowires (e.g. Ni, Co 23 Ni 77 , Ni 85 Fe 15 ) with 200 nm diameters were investigated. The ferromagnetic nanowires were successfully electrodeposited within an anodized alumina by controlling solution composition, temperature, and current density.…
The specific features in the structure of nanostructured glass-ceramic materials based on sodium zinc silicate glasses doped with lead sulfide are investigated using small-angle X-ray scattering and X-ray powder diffraction. It is established that a close-to-monodisperse size distribution of PbS nanocrystals is an imp…
Abstract The objective of this work was to synthesize boron incorporated PVA/Zinc acetate nano precursor composite polymer fibers using electrospinning technique. Produced fibers, are useful reagents in organic synthesis of zinc oxide nano structures which have gained wide interest because of their potential applicati…
This paper presents the mechanical methods used for calcite scale cleaning of wells in the Kizildere geothermal field in Western Turkey. A geothermal power plant with a capacity of 20.4 MWe has been operating in the field since 1984. During production well diameter reduces because of calcite scaling which has been a c…
The thermal properties of compounds of the general formula Bi m + 1 Fe m − 3 Ti3O3m + 3, which are layered perovskite-like phases of the Aurivillius type, are investigated as a function of their composition. It is demonstrated that the temperature of decomposition of the Bi m + 1 Fe m − 3 Ti3O3m + 3 compounds decrease…
Abstract Cellulose fibres were prepared from N-methylmorpholine-N-oxide (NMMO) as a direct solvent. The specific chemical properties of NMMO allow in-situ silver particles to be generated during the process of cellulose dissolution. The fibres obtained contained 0.005% (50 ppm) to 3% w/w of silver. The SEM images show…
Abstract A method to create networks of intricate fluidic channels formed from metals and ceramics is proposed and demonstrated. The method exploits buckle delamination of a thin compressed film bonded to a substrate. A low adhesion layer coinciding with the desired layout of the channel network is laid down prior to…