Materials Literature
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Tetra and octa substituted novel zinc(II) phthalocyanines (3a and 5a) bearing carbazole groups were synthesized by cyclotetramerization of respective phthalonitrile derivatives (3 and 5). The zinc(II) phthalocyanines (3a and 5a) were converted into the water-soluble quaternized derivatives (3b and 5b) by utilizing dim…
The structural, bonding, electronic, mechanical and thermal properties of ternary aluminum silicon carbides Al4SiC4 and Al4Si2C5 are investigated by first-principles calculations combined with the Debye quasi-harmonic approximation. All the calculated mechanical constants like bulk, shear and Young’s modulus are in go…
Abstract A modified procedure for bentonite purification and a new method for the quantitative characterization of bentonite using smectite content are reported. Bentonite found in a drill core of Tsunagi Mine, Niigata, Japan was evaluated by the new method to demonstrate the substantial increase in smectite content f…
Nanoporous epoxy with gyroid texture is fabricated by using a nanoporous polymer with gyroid-forming nanochannels as a template for polymerization of epoxy. The nanoporous polymer template is obtained from the self-assembly of degradable block copolymer, polystyrene-b-poly(l-lactide) (PS-PLLA), followed by hydrolysis…
In the study, a new approach for synthesizing biomedical segmented polyurethanes (SPUs) based on polyethylene glycol (PEG, Mn = 800), poly(ε-caprolactone-co-D,L-lactide) (PCLA) and aliphatic diurethane diisocyanates with a long uniform hard segment was developed. By the chain extension of a mixture of PEG diol and PCL…
A synthetic protocol to synthesize 2-bromobenzo-1,3,2-dithiaboroles in one step from easily accessible benzene bis(isopropyl thioether)s has been developed. The reaction is remarkably specific in converting substrates with two adjacent (i)PrS moieties while leaving isolated thioether functions and other functional gro…
Periodically structured nanomaterials such as superlattices have a wide range of applications. Many electronic devices have been fabricated from these materials. The formation of spontaneous layer structures using epitaxial growth has also been reported for many compound semiconductors but for very few ceramics. We de…
Abstract This article provides a detailed discussion on heat treatment of titanium alloys such as alpha alloys, alpha-beta alloys, and beta and near-beta alloys. Common processes include stress-relief, annealing, solution treating, aging, quenching, and age hardening. It provides information on the effects of alloying…
Abstract Quenching is a widely used technique to strengthen titanium alloys. This article presents the metallurgical and structural background underlying the specific techniques applied in the quenching of various titanium alloys, and the ways to control and reduce residual stresses induced from quenching or other the…
Abstract The effects of chloride concentration, creviced scaling factor and immersion time on the percentage area and maximum depth of attack for Type 304 stainless steel (SS304) in chloride solutions were investigated. The crevice assembly comprised of coupon (SS-304), polytetrafluoroethylene (crevice former) and fas…
Charge Density of Al Doped Lanthanum Orthoferrites R. Saravanan, G. Gowri Bulk Al doped lanthanum orthoferrites (La1-xAlxFeO3-LAFO) have been prepared using the solid state reaction method, for three different concentrations of Al (x=0, 0.40, 0.50). The prepared samples have been characterized by a powder X-ray diffra…
We have studied the reflection spectrum of leucosapphire in the range of 2.5–25.0 μm. Based on the analysis of the known frequency and temperature dependences of the absorption coefficient in the range of 2.5–7.0 μm, its extrapolation to the range of 10.6 μm has been performed. We have shown that the absorption coeffi…
Kovar, a common glass-to-metal sealing alloy, has been analysed by XPS. Monochromatic aluminium and silver sources as well as an achromatic magnesiumx-ray source have been utilised to demonstrate the increased clarity of spectra that can be obtained through the use of each x-ray source in the analysis of a transition…
In this work, sodium dodecyl sulfate (SDS) was used to obtain organically-modified layered double hydroxide (OMgAl-LDH) by anion-exchange reaction. The PLLA/LDH nanocomposites were prepared via direct melt intercalation. The results from both XRD patterns and FTIR spectra showed that SDS entered into the layers of LDH…
The non-vacuum electron beam cladding technology was used to increase wear resistance of commercially pure (CP) titanium by coating the titanium substrate with a powder mixture of boron carbide and titanium. The structure of samples was investigated by optical and scanning electron microscopy. Structural investigation…
Alternative methods for electricity production are needed in view of the scarcity of natural sources resulting from population growth and the consequent demand for energy. The inefficient use of energy requires new recovery processes in order to increase the system's gains. The use of Seebeck modules (TEG) have been s…
This paper concerns a thermomechanical model describing the assisted two-way memory effect of a helical spring. This model takes into account the phase transformation kinetics. A particular attention is paid on the effect of R-phase transformation. The proposed model is validated using experimental results.
Pipelines are one of the most convenient and effectiveways of transporting petrol over a long distance. The environmentapplies, beyond extremely high external pressures, lowtemperatures and intensive corrosive process, the occurrence ofdefects on the pipe body, which compromises the structuralintegrity of pipelines le…
Cu2O is a highly relevant material for application as a top cell layer in a tandem solar cell structure. Phase-pure Cu, Cu2O and CuO have been deposited with reactive magnetron sputtering by varying the oxygen flow during the deposition from 0 to 2 sccm, using a total flow of 51 sccm. The Cu2O films are highly transpa…
Sustainable developments impose increasing pressure on Low Voltage (LV) underground power cables, leading to an increasing interest in condition assessment for LV systems. LV cables have been designed mainly on mechanical considerations taking insulation of low voltage levels for granted. However, concerns on degradat…