Materials Literature
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This paper deals with the structural and adsorptive characterisation of a Zn–Al-type layered double hydroxide to be used for the retention of chromate ions from aqueous media. Structural characterisation by X-ray diffraction and FT-IR spectroscopy showed that the material was a layered double hydroxide with carbonate…
Abstract Elastomer nanocomposites reinforced with low volume fraction of nanofillers, such as nanoclays and carbon nanofibers, have long been known to possess significantly improved mechanical, thermal, dynamic mechanical, flame retardant, and barrier properties. The present work attempts to evaluate the effect of nan…
We construct a phenomenological model to describe the general features of chiral smectic C* (Sm C*) phase and Sm A–Sm C* phase transition properties of ferroelectric liquid crystals. The free-energy density of the system is expanded in terms of three degrees of freedom – tensor orientational order Q ij , scalar smecti…
The effect of antimony ( Sb ) substitution for niobium ( Nb ) on potassium sodium niobate (KNN) ceramic was investigated with respect to the densification behaviour at different sintering temperatures, microstructure and electrical properties. A small amount of Sb 5+ was added while simultaneously lowering the amount…
The effect of disorder on the orbital state in the spinel FeCr 2 S 4 has been investigated with the substitution of Cr by Al, Ga, and Fe, respectively. For polycrystalline FeCr 2 S 4 , being related to the orbital-ordering transition around 9 K, the temperature dependence of magnetization shows a step-like transition,…
An instrument is developed to evaluate the performance of heat dissipative coatings. The instrument has features to measure the apparent emissivity of a given surface under different input power settings. The emissivity of aluminum (Al Q-panel) and copper, as measured from 60-135 degrees C, showed a value of 0.15+/-0.…
The synthesis and surface modification of ZnO nanoparticles, achieved through a controlled precipitation reaction using NaOH as precipitating agent with a 0.2 molar ratio were studied. The surface modification was carried out through a chemical hydrolysis reaction at 80°C for 6 h, in order to promote better adhesion b…
Zinc protective coatings on high carbon SWRH82B-1 steel were sherardized to markedly improve corrosion resistance of the high-strength steel bridge cable wires (SBCW). Sherardizing parameters have been optimized by optical microscopy (OM) /scanning electron microscopy (SEM), X-ray diffraction (XRD) and potentiodynamic…
We report the effect of a 4d ion (Ru3+) substitution on structural disorder and magnetic ordering in the cyanide-bridged molecular magnets, RuxNi3-3x/2[Cr(CN)6]2⋅zH2O (0≤x≤0.5). Structural analysis, by employing Rietveld refinement of x-ray diffraction patterns, reveals a face centered cubic structure for all these co…
Bi 2 FeCrO 6 thin films were epitaxially grown by pulsed laser deposition on (100)-oriented LaAlO 3 , ( LaAlO 3 ) 0.3 ( Sr 2 LaTaO 6 ) 0.7 and SrTiO 3 single crystalline substrates with and without epitaxial CaRuO 3 buffered layer. The in-plane compressive strain induces monoclinic distortion of the Bi 2 FeCrO 6 latti…
We have characterized ultrananocrystalline diamond films with different surface terminations by x-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). The surface terminations were performed by plasma functionalization in at…
Two types of lanthanide-containing derivatives of the 19-tungsto-2-arsenate(III) [As 2 W 19 O 67 - (H 2 O)] 14 − (As 2 W 19 ) have been synthesized in mildly acidic aqueous media and characterized in the solid state. The ytterbium(III)-containing anion [Yb(H 2 O) 2 K(H 2 O) 2 As 2 W 19 O 67 (H 2 O)] 10− (1) was formed…
A total of 18 species of silica-scaled chrysophytes (Chrysophyceae: one species each in Chrysosphaerella, Spiniferomonas, and Paraphysomonas; Synurophyceae: 11 Mallomonas spp. and four Synura spp.) was recorded from river samples collected in Edo State, Benin, Nigeria, from both dry and rainy seasons in 2003. Identifi…
The magnetic, electric, and magnetoresistive properties of bulk samples of La1−xNaxMnO3±δ (x=0.08–0.16) are studied. It is shown that at low temperatures all samples are ferromagnetic and the temperature of the transition from the paramagnetic into the ferromagnetic state increases with increasing sodium content. It i…
Cross-links are nowadays recognized to play a key role in the overall mechanical strength of buckypapers, nanotube or graphene based materials; material scientists or chemists are thus developing new nanomaterials with denser and stronger cross-links in order to maximize their mechanical strength. However, in spite of…
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We report resistivity and thermo-electric power measurements of the anatase phase of TiO2under pressure up to 2.3 GPa. Despite its transparent appearance, the single crystal of anatase exhibits a metallic-like resistivity above 60 K, at all pressures. The rather high value of the thermo-electric power at room temperat…
This letter evaluates the electrical and reliability performances of a back-end-of-line Cu/ultralow-k(ULK) dielectric interconnect with features of gouged via and damage-free profile. The interconnect structure in ultralarge-scale integrated circuits forms vias between successive layers by forming first the via openin…
Abstract The optical properties of the TlInS 2x Se 2(1‐x) mixed crystals (0.25 ≤ x ≤ 1) have been investigated through the transmission and reflection measurements in the wavelength range of 400–1100 nm. The optical indirect band gap energies were determined by means of the analysis of the absorption data. It was foun…
Abstract Summary : High‐yield synthesis of gold microplates is achieved through autoreduction of hydrogen tetrachloroaureate (III) hydrate (HAuCl 4 · 3H 2 O) in aqueous solutions of poly(ethylene oxide)‐poly(propylene oxide)‐poly(ethylene oxide) block copolymer (Pluronic L64, EO 13 PO 30 EO 13 ) at ambient conditions,…