Materials Literature
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Yttrium tartrate (YT) single crystals have been grown by gel encapsulation technique. The crystallinity of the grown crystals was confirmed by XRD technique. The dielectric constant, dielectric loss and ac conductivity was measured as a function of frequency in the range 1 kHz to 1 MHz and temperature range of 30°C to…
The structural, electrical and magnetic properties of the La 0.7 Sr 0.3 Mn 1− x Ti x O 3 system characterized by rhombohedral lattice distortions are studied. Substitution of titanium for manganese weakens ferromagnetism and leads to an increased resistivity. Using x-ray Rietveld full-profile refinement data and ferro…
Compounds having the BLSF structure are interesting in view of their ferroelectric properties and also various applications. These are Aurivillius phases having the general formula (Bi2O2)2+ (An−1BnO3n+1)2− where A represent the 12-fold coordinated cation with low valancies in the perovskite sub lattice; B denotes the…
The effects of high-pressure water vapor annealing (HWA) on the photoluminescence (PL) of quantum-sized silicon materials have been studied for as-anodized or electrochemically oxidized heavily doped n-type porous Si (PS) and electrochemically oxidized p-type PS. PL efficiency and stability are markedly enhanced in al…
Two functional N-substituted maleimide monomers, namely N-(4-carboxyphenyl)maleimide (CPMI) and N-(4-formylphenoxy-4′-carbonylphenyl) maleimide (FCPMI), were copolymerized with N Vinyl-2-pyrrolidone (NVP) at 90° C in the presence of 2,2′-azobisisobutyronitrile as initiator in dimethylformamide. The monomers reactivity…
Pearl oysters (Pinctada imbricata) were held in the laboratory and exposed to various levels of the heavy metals lead and zinc and the aliphatic hydrocarbons hexadecane and octacosane for 2 months. Individual oysters were followed over the course of the experiment, allowing specific calculation of total oyster growth…
The fluorescence of terbium (III) was enhanced by about three orders of magnitude in the presence of trimellitic acid (benzene-1, 2, 4-tricarboxylic acid (TLA)) in aqueous solution at pH 6. The fluorescence intensity could be greatly increased when the system of Tb 3+ -TLA was treated with La 3+ (or Gd 3+ ) and Triton…
The Fe 50 Co 50 , Fe 65 Co 35 , and Fe 35 Co 65 alloys heat-treated between 500 and 1300°C were characterized by x-ray diffraction and transmission electron microscopy. The surface layer of the alloys was found to phase-separate in the range 900–1300°C, leading to the formation of alternating α and γ zones on the orde…
Ab initio molecular dynamics (MD) is used to investigate NO reaction processes on the (001) surface of CaO. A novel path is proposed for the first steps of nitrogen oxides reactivity catalyzed by the CaO surface. The mechanism consists of the formation of anionic dimers, adsorbing on the surface cations, at the expens…
The changes in surface morphology of Tencel fabric at each step of the fibrillation process were investigated by means of scanning electron microscopy. The results showed that after the removal of sizing materials in the desizing process, fibrillation started to occur and the fibrillation effect was further enhanced w…
A phenomenological continuum model is adapted to describe the transverse mechanical behavior of Kevlar ® KM2 single fibers in compression. This model could be used for numerical simulations of the mechanical behaviors of fabrics made of Kevlar ® KM2 fibers. An equivalent fiber model is used to form the phenomenologica…
The grafting of polyolefins with maleic anhydride (MA) has been incorporated into industrial practice to generate copolymers that can act as coupling agents between the non-polar polyolefins and different polar fillers and reinforcements. In the present study, two different peroxides were used to initiate the MA graft…
Poppiite, a new mineral from Gambatesa mine (Val Graveglia, Genova, Northern Italy), is the V 3+ end-member of the pumpellyite group [ [VII] (Ca 7.68 Na 0.27 K 0.03 Rb 0.02 ) Σ8.00 [VI] (V 3+ 1.26 Fe 3+ 1.02 Mg 0.78 Mn 2+ 0.59 Al 0.31 Cu 2+ 0.04 ) Σ4.00 [VI] (V 3+ 6.89 Al 1.07 Ti 0.04 ) Σ8.00 [IV] (Si 11.69 Al 0.31 )…
Having nanosize and unique electrical properties, carbon nanotubes (CNTs) attract lot of interest among scientific community all over the world. One of the recent observations is its role as nanosensors. Obviously the nanosize and high strength of CNT are most preferred parameter for technical and electromechanical fi…
Zeolites are crystalline porous aluminosilicate framework solids. Although there are many reports of how the structures change as a function of temperature, similar studies as a function of high pressure are relatively scarce. With the increasing availability of synchrotron X-ray sources and greater knowledge in the c…
Differential thermal analysis (DTA) method was applied to study the pressure–temperature phase diagrams for four members of the 4′-alkyl-4-isothiocyanato-biphenyl (nBT) homologous series (n = 9–12). These compounds exhibit a smectic E polymorphism enriched by a smectic A phase for two longest members. Measurements wer…
Chenille yarns are vulnerable to abrasion because of easy pile loss. In this study different chenille yarns were produced from sirospun and two-folded ring, 100% wool and 50% wool-50% polyester blend yarns of different fiber fineness. A yarn abrasion device was designed in order to measure the abrasion resistance of c…
Complex compound material (activated carbon fiber, saturated with salts, or metal hydrides) was developed as an efficient gas (ammonia, methane, hydrogen) adsorbent for new gas storage and transportation system application. To enhance the performance and thermodynamic efficiency of the gas storage vessels a heat pipe…
This article presents a novel method to measure the in situ thickness of porous alumina (PA) films. The PA films were prepared in oxalic acid at 30, 40, and 60 V direct current. Based on the atomic force microscope measurements, PA film porosities and refractive indexes measurements were acquired. With the observation…
Article High Strength Aluminum Alloys Reinforced by Nanosize Quasicrystalline Particles for Elevated Temperature Application was published on April 1, 2006 in the journal High Temperature Materials and Processes (volume 25, issue 1-2).