Materials Literature
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Electrospun fabrics, prepared from 5, 7 and 10%w/v were Poly(vinyl alcohol) (PVA) solutions successfully prepared. The electrospinning condition was 15 kV, distance 15 cm, flow rate of 1 ml/hr and spinning time of 5 hours. Physical properties of electrospun PVA fabrics were analysed by SEM, FE-SEM and contact angle me…
Based on the assumption that sp3 hybridization is more stable in bulk silicon, this study is a step forward in understanding the structures and mechanical properties of silicon nanotubes (SiNT). Using the well tested form of Tersoff potential we have calculated cohesive energy and other parameters for SiNT of various…
Barium strontium titanate (Ba0.6Sr0.4TiO3, BST) nano-powders were prepared using Ba(NO3)2, Sr(NO3)2, oxalic acid dehydrate, and tetrabutyl titanate (Ti(OC4H9)4) as precursors by the chemical co-precipitation method. The product was characterized by thermogravimetry-differential scanning calorimetry (TG-DSC) thermal an…
Water tree degradation phenomenon constitutes a serious problem in XLPE insulated power cables. The presence of water trees lead to harmonic components in the insulation loss current, of which analysis provides a powerful indication of the state of the degradation. The first goal of this study is to establish a proced…
A scapolite sample, Me79.6, from Slyudyanka, Siberia, Russia, has been studied using in situ synchrotron powder X-ray diffraction (XRD) and Rietveld structure refinements on heating from 26 to 900 °C and on cooling to about 300 °C. The structure was modeled and refined in space group I4/m. An accurate room-temperature…
A series of silicon carbide ceramic samples with variable characteristics of the microporosity and strength, such as the ballistic strength σ B and the static strength σ S , are investigated. The dependences of the strength on the integral porosity for ceramic materials are determined. It is established that the stren…
Ce3+:(Lu0.7Y0.25La0.05)2O3 transparent ceramics were fabricated with nanopowders and sintered in H2 atmosphere. The spectral properties of Ce3+:(Lu0.7Y0.25La0.05)2O3 transparent ceramics were investigated and the luminescence of Ce3+ in the solid solution of Lu2O3, Y2O3 and La2O3 has been found. The ceramics has high…
The radiation shielding properties of steel and its variation with the boronizing process have been investigated. For this purposes the linear attenuation coefficients of steel have been measured before and after boronizing the steel at the photon energy of 662 and 1250 keV. The measured results before boronizing were…
The toxicological effect of TiO 2 nanoparticles with different crystal structure (80 nm for rutile and 155 nm for anatase) on female mice was investigated through intranasal instillation. After exposure for 30 days at the dose of 50 mg/kg body weight, no abnormal activity and mortality were observed with the normally…
Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008
The surface of the poly(monochloro- para -xylylene) (parylene-C) films after O 2 plasma and successive Ar and NH 3 plasma treatment was investigated using a contact angle and an X-ray photoelectron spectroscopy (XPS) measurement. In this work, it was confirmed that the polymer hydrophilicity after the O 2 plasma treat…
Global thermally stimulated discharge current (TSDC) and partial thermally stimulated discharge current (PTSDC) spectra were recorded to investigate the molecular motions at glass transition temperature (Tg) level in both sided vacuum aluminized 30 μm thick poly (methyl methacrylate) samples. The calculated values of…
This paper presents a reliable method for the growth of single-walled carbon nanotubes (SWNTs) at room temperature by using localized heating. A surface micromachining technique is used to create suspended microstructures for good thermal isolation. Pt resistors are integrated as the heating source, and the local grow…
Silane-based dusty plasmas are widely used in plasma-enhanced chemical vapor deposition processes to synthesize silicon nanoparticles and/or nanostructured thin films. Under certain conditions, it is possible to access to the inner structure of the thin film by scanning electron microscopy, using the ldquoholerdquo du…
The dependence of the fragility on the Grüneisen lattice parameter, which is a measure of the anharmonicity of lattice vibrations, is established for lead silicate and sodium borate glasses. An expression relating the fragility of glasses to the parameters of the Williams-Landell-Ferry equation is obtained. The calcul…
Four flaky graphite cast irons of different graphite structures with a pearlitic matrix were prepared to clarify the graphite structure's influence on the dry sliding wear property. Two melts of cast iron with different carbon contents were solidified at two different cooling rates. The four resultant samples had type…
ZnO and Al-doped ZnO (AZO) were etched in Cl 2 /CH 4 /H 2 /Ar (Cl 2 -based) and BCl 3 /CH 4 /H 2 /Ar (BCl 3 -based), inductively coupled plasmas (ICPs) and their etching characteristics were compared by varying the Cl 2 /(Cl 2 +CH 4 ) and BCl 3 /(BCl 3 +CH 4 ) flow ratios, top electrode power and dc self-bias voltage…
Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008
The crystallization of strontium borate glasses containing 16.7–43.0 mol % SrO is investigated. New crystalline compounds of the hypothetical compositions 2SrO · 3B 2 O 3 (metastable) and SrO · 5B 2 O 3 (stable below 750°C), as well as the metastable diborate modification β-SrO · 2B 2 O 3 , are revealed, and their X-r…
Abstract Polymer nanocomposite films with unusual and anisotropic optical properties were obtained by the controlled in‐situ generation of noble metal nanoparticles (NPs). Poly(vinyl alcohol) (PVA) and poly(ethylene‐ co ‐vinylalcohol) (EVAl) nanocomposites containing gold and silver NPs were efficiently produced by a…