Showing papers in "Materials Letters in 2000"

TL;DR: In this article, the tribological behavior of pure copper and composites was studied on a pin-on-disc tester, where the pins were slid against a hardened steel disc under dry ambient conditions.

TL;DR: In this article, a homogeneous precipitation method using urea from SnCl4 solution was used to synthesize nanoscale precursor powders in the range of 3 to 4 nm in diameter together with a narrow particle size distribution.

TL;DR: In this paper, the 18 O/16 O isotope exchange/depth profile (IEDP) method has been employed to investigate oxygen tracer diffusion and surface exchange behavior in perovskite oxide La 0.8 Sr 0.2 MnO 3+ δ at temperatures between 700°C and 1000°C.

TL;DR: A reactive cationic surfactant vinylbenzyldimethyldimethylldodecylammonium chloride (VDAC) was synthesized for intercalation of montmorillonite (MMT), a smectic type of clay as mentioned in this paper.

TL;DR: In this article, optical microscopy and scanning electron microscopy (SEM) were used to examine the fracture behavior of AZ91 magnesium alloy ruptured by tensile and impact tests.

TL;DR: In this article, a simplified method to synthesize the nitrate forms of layered double hydroxides (LDHs) was reported, with Mg:Al ratios of 2:1, 2.5:1 and 3:1.

TL;DR: In this article, submicron hydroxyapatite (HA) powders were prepared by a chemical precipitation method and electrophoretically deposited on individual carbon fibers, carbon fiber bundles and felts.

TL;DR: In this paper, a perovskite-type LaFeO 3 was synthesized under Na 2 CO 3 -containing medium, and characterized by X-ray diffraction (XRD), SEM, IR and ICP.

TL;DR: In this paper, the citrate precursor and the aerosol pyrolysis technique were combined to obtain 10 nm in diameter barium ferrite nanoparticles, which can be easily disaggregated by grinding in a mortar.

TL;DR: In this article, a mixing study was conducted with 316L stainless steel and titanium carbide powders and the results showed that 54% volumetric powder loading gave satisfactory flow properties when mixed at a temperature of 90°C with a rotor speed of 30 rpm.

TL;DR: In this article, a high-energy ball milling technique was used to synthesize ultra-fine Pb(Zr0.52Ti0.48)O3 powder from commercial PbO, TiO2 and ZrO2 powders in air at room temperature without any postannealing.

TL;DR: In this paper, the Fourier transform infrared (FTIR) spectra of samples obtained at 180°, 200° or 220°C showed 25-40 cm−1 upward shift in the stretching and bending vibrations assigned to boehmites.

TL;DR: In order to improve bonding between HA and polyethylene, and hence to increase mechanical properties of the composite, chemical treatments of HA andpolyethylene were investigated and new composites manufactured.

TL;DR: In this article, a mechanism of polyvinyl pyrrolidone (PVP) adsorption is suggested to be as acid-base interaction between the substrate surface and polymer segments, where the presence of surface hydroxyl groups, with the tendency to lose protons acting as Bronsted acid sites in the crystal lattice of these metal oxides, can interact with the binding sites of PVP segments.

TL;DR: In this paper, a large glass-forming region was found at the phosphate side of the ternary system with homogeneous glasses containing up to 20−40 mol.% of B2O3.

TL;DR: In this article, thin films of ionic-conducting electrolyte yttria-stabilized zirconia (YSZ) have been prepared on Si(111) substrates by aerosol-assisted chemical vapor deposition (AACVD).

TL;DR: In this paper, the structure of the melt of an Al-13 wt.% Si alloy heated in the temperature range from 625°C to 1250°C was investigated using a high temperature X-ray diffractometer.

TL;DR: In this article, Li doping on the Na0.05Ni0.95O was carried out to increase the conductivity, resulting in an increase in the power factor as high as 3.3×10−4 W/K2 m at 1260 K.

TL;DR: In this article, the effect of a magnetic field on the Gibbs free energy of a material depends on its magnetization behaviors, and a phase diagram of the Fe-Fe3C system is drawn.

TL;DR: In this paper, the shape memory properties of a Ti 36 Ni 49 Hf 15 high temperature shape memory alloy (SMA) by bending tests were studied and the shape recovery ratio is constant at 92% when the deformation temperature is below 457 K, then rapidly decreases to zero above 590 K for the specimen deformed to 4.5%.

TL;DR: In this paper, the TFTEGs were composed of several layers of plate-modules and each plate-module contained 15 p/n couples and was connected electrically in series or in parallel.

TL;DR: In this article, a simple one-step method for enzyme immobilization is demonstrated with encapsulating alkaline phosphatase in mesoporous sol-gel silica, where the pore size is much greater than that of traditional microporous solgel silicas, and enzymatic activity is increased by a factor of 2 to 10 because of easy diffusion of the substrate molecules.

TL;DR: The complex oxides, Bi2MoO6 and Bi2WO6, were hydrothermally prepared at 120-180°C for 2-4 days and characterized by powder X-ray diffraction (XRD), thermogravimetric analysis (TGA), IR spectroscopy, transition electron microscopy (TEM), EDAX analysis and electric conductivity measurements as discussed by the authors.

TL;DR: In this paper, the authors investigated the luminescent properties of silica xerogels under various preparation conditions and compositions, and found that they have similar luminescence properties when using C2H5OH and N,N-dimethylformamide (DMF) as solvents, i.e., a red shift of excitation and emission has been observed in the latter case.

TL;DR: In this paper, the authors used transmission electron microscopy (TEM) to characterize the TiO2 anatase nanocrystals deposited on carbon films from colloidal solutions, which exhibit different sizes, shapes, and facets depending on the pH value and the type of organic additives in the colloidal solution.

TL;DR: In this article, thin films of zirconia and an organoceramic composite consisting of ZIRconium hydroxide and poly(diallyldimethylammonium chloride) (PDDA) were obtained via cathodic electrodeposition.

TL;DR: In this article, the existence of little nanosized monoclinic ZrO2 particles in clear stable ethanolic colloidal suspensions was confirmed by transmission electron microscopic observations.

TL;DR: In this paper, an inexpensive chemical bath technique for nanocrystalline Ag2Se thin films deposition on transparent polyester sheets is developed, which is essentially based on a hydrolytic decomposition of selenosulfate.

TL;DR: In this paper, a microwave dielectric ceramic resonators based on BaCe2Ti5015 and Ba5Nb4O15 have been prepared by conventional solid state ceramic route.

TL;DR: Hard and soft-magnetic ultrafine ferrite powders have been successfully synthesized using a combination of coprecipitation and mechanical milling as mentioned in this paper, which shows significant potential for commercial production of high-quality magnetic ferrite particles.