Materials Literature
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HfB2-HfC-SiC ultrahigh temperature ceramics (UHTCs) were prepared and characterized in this paper. It is showed that the densities of the HfB2-HfC-SiC reach 98.5% of the theory density. The room temperature compressive properties of the HfB2-HfC-SiC are good, while those at high temperature decrease rapidly. The volum…
Corrosion fatigue behavior of 2205 duplex stainless steel (DSS [UNS S31803]) in 2 M sulfuric acid (H2SO4) + 0.7 M hydrochloric acid (HCl) solution at various loading frequencies and under selective dissolution conditions was investigated. The mechanical and chemical effects on the fatigue crack initiation as well as c…
We study the electrical properties of newly synthesized disk-shaped molecules, trihexyl benzene tricarboxiamides (T6B), in a crystalline phase. Our experimental results show that T6B exhibits displacement–external field hysteresis behavior and pyroelectric behavior. The residual polarization was the largest at 70 °C a…
Single phase Sialon was synthesized successfully from fly ash by carbothermal reductionnitridation reaction in this paper. The effects of synthesizing temperature (1200°C, 1300°C, 1400°C and 1450°C) and carbon content (stoichiometric content, exceeding 10%, 50% and 100%) on the final production were studied by XRD and…
The distinctive features of limited solubility in liquid eutectic and monotectic metallic systems have been discovered. The monodispersed emulsion model has been elaborated for a description of the specific microheterogeneous structure of eutectic melts. It includes the transitional shells (TS) at the interface bounda…
Dielectric behaviour of Sr 0.61 Ba 0.39 Nb 2 O 6 (61SBN) and Sr 0.75 Ba 0.25 Nb 2 O 6 (75SBN) single crystals has been studied. It is observed that 61SBN has relatively low diffuseness as well as smaller relaxation compared to 75SBN. Increase in the configurational entropy imposed by the change in defect structure is…
Compounds Yb2Mo3O12 and Lu2Mo3O12 were prepared by conventional solid-state reaction. Their crystal structures and thermal expansion properties were investigated. It was found that Yb2Mo3O12 and Lu2Mo3O12 adopt orthorhombic structure and show negative thermal expansion (NTE) in the temperature range of 200-800 °C. The…
Abstract Summary: The influences of short chain branching (SCB) and molecular (M w ) weight of low density polyethylene (LDPE) on the solid state properties of polypropylene (PP)‐LDPE blends were investigated by mechanical and thermal techniques. DSC analysis of all blends exhibit a double melting peak at all composit…
The interactions of two amphiphilic porphyrins with anionic surfactant sodium bis(2-ethylhexyl)sulfosuccinate (AOT) in aqueous solutions were studied by UV-vis absorption spectroscopy, fluorescence spectroscopy, resonance light scattering technique, fluorescence anisotropy and surface tension measurements. The two por…
Infrared to visible upconversion emission bands are observed in Nd3+: LiTeO2 glass at 430, 482, 525, 535, 580, 600, 664 and 766 nm wavelengths due to the 2P1/2 4I9/2, 2P1/2 4I11/2, 2P1/2 4I13/2, 4G7/2 4I9/2, 2P1/2 4I15/2, 4G7/2 4I11/2 & 4G5/2+2G7/2 4I9/2, 4G7/2 4I13/2 and 4G7/2 4I15/2 transitions, respectively. Mechan…
Amiloride hydrochloride, a generally used diuretic recently has been found effective in the treatment of epilepsy. The side effects of the drug, such as hyperkalemia, hypertension, and hyperaldosteronism were controlled by reducing the dose and targeting the drug to the brain. The objective of this study was to determ…
The pressure dependences of the refractive index for aluminosilicate glasses of the compositions 0.167CaO · 0.167Al 2 O 3 · 0.666SiO 2 and 0.157CaO · 0.177Al 2 O 3 · 0.666SiO 2 at pressures up to 6.0 GPa are determined using a polarizing interference microscope and an apparatus with diamond anvils. The compressibiliti…
A new environmental friendly catalyst H3PW12O40/PAn was prepared and identified by means of FT-IR, XRD, and TG/DTA. The optimum conditions have been found; that is, the mass ratio of PAn to H3PW12O40 is 1:1.5, the volume of methanol is 20 mL, and the reflux reaction time is 3 h. The structural identity of Keggin units…
The state of octaphenyltetrapyrazinoporphyrazine in dimethylsulfoxide was studied. The proton transfer complex formed was found to be fairly stable; its structure was suggested. The complex was kinetically unstable in strongly basic media. The influence of the nature of cyclic and acyclic nitrogen bases on the rate an…
Molecular dynamics simulations are used to model the thermal properties of a fluid containing solid nanoparticles (nanofluid). The flexibility of molecular simulation allows us to consider the effects of particle mass, particle-particle and particle-fluid interaction and that of the spatial distribution of the particl…
An idea for simultaneously manipulating spin and charge in a single semiconductor medium has resulted in the development of diluted magnetic semiconductors (DMSs), which exhibits surprisingly room temperature ferromagnetic signatures despite having controversial ferromagnetic origin. However, achievement of truly room…
Phase diagrams for the Sc 2 S 3 -Ln 2 S 3 (Ln = Dy, Er, or Tm) systems were designed in the range from 1000 K to melting temperatures. The Ln 3 ScS 6 compounds that are formed in these systems crystallize in monoclinic space group P 2 1 / m , and melt congruently: for Dy 3 ScS 6 , a = 1.118 nm, b = 1.262 nm, c = 0.354…
Mo 6 S 3 I 6 nanowire networks of interest are found to change their resistance in response to the presence of analyte vapors. The vapor sensing behavior is quantitatively described very well phenomenologically in terms of the concentration of adsorbed analyte molecules in the contact tunneling junctions, and an expre…
Abstract We have applied atomistic simulation techniques to model the continuous CdCO 3 -CaCO 3 solid solution and to investigate the thermodynamic properties. All inequivalent substitutional configurations were considered for the single unit cell and the (2x1x1) supercell for the full range of Cd concentrations, as w…
Gold nanoshells have gained attention recently due to their versatile optical properties. In particular, their spectrally selective extinction has been exploited for experimental medical applications, functional coatings and contrast enhancement for analytical techniques. Here we discuss nanoshells and the formation o…