Showing papers in "Materials Letters in 2011"

TL;DR: In this paper, the authors developed a new method for the preparation of high value, environmentally friendly products from tailings Magnetic Fe3O4 nano-powder was synthesized by ultrasonic assisted chemical co-precipitation utilizing high purity iron separated from iron ore tailings by acidic leaching method Magnetite particles with 15nm average diameter were characterized by X-ray diffraction, field-emission scanning electron microscopy and vibrating sample magnetometer.

TL;DR: In this article, the structural, optical, photo catalytic and antimicrobial properties of pure and cobalt doped ZnO nanoparticles synthesized by Co-precipitation method are presented.

TL;DR: The effect of reducing agents on the particle size and morphology has been studied by carrying out the two reactions at the same ultrasound frequency (20 KHz) in this paper, where the strong reducing agent (NaBH4) produced spherical silver nanoparticles of sizes 10-15 µm and the sodium citrate led to much smaller particles of ~ 3 µm diameter.

TL;DR: In this article, a one-pot method for synthesis of silver nanoparticles through green route using sulfated polysaccharide isolated from marine red algae (Porphyra vietnamensis ).

TL;DR: In this article, TEM results showed that the synthesized TiO 2 powders were anatase nanoparticles about 7nm in size and a remarkable red shift of the absorption edge was achievable by increased Mn content, leading to gigantically narrowed energy gap to permit absorption well into the infrared spectral region.

TL;DR: In this article, the effect of different curing temperatures on the geopolymerization process, physical, mechanical and optical properties of a metakaolin-based geopolymers activated by alkali was studied systematically by means of differential scanning calorimetry (DSC), SEM, UV/Vis Spectrophotometry, Leaching analysis and Brunauer-Emmet-Teller method (BET).

TL;DR: In this article, a dealloying method employing a metallic melt, instead of an aqueous solution, was proposed for the preparation of nanoporous less-noble metals.

TL;DR: National Natural Science Foundation of China[21036004, 20976146]; Natural science Foundation of Fujian Province of China [2010J05032, 2010J01052]

TL;DR: In this article, the authors used long-chain gelatin compounds to terminate the growth of ZnO-NPs and to stabilize them, and the results showed that gelatin is an interesting material that can be used as a stabilizer in the sol-gel technique for preparing small zinc oxide nanoparticles.

TL;DR: An electrochemical route to synthesize CuO thin films with nano-whiskers like structure, from a metallic Cu precursor is reported in this article, where X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis, Photoluminescence (PL) and Raman analyses were carried out with the films.

TL;DR: In this paper, the authors reported that the as-synthesized Cu-doped ZnO nanowires were a kind of promising photocatalyst in remediation of water polluted by some chemically stable azo dyes under visible light.

TL;DR: In this article, a severe plastic deformation (SPD) technique based on tubular channel angular pressing (TCAP) is proposed suitable for deforming cylindrical tubes to extremely large strains without changing their dimensions.

TL;DR: In this paper, α-Fe 2 O 3 nano-particles were prepared by direct thermaldecomposition of γ-Fe O 3, and the precursors were subsequently calcined in air for 1h at 500°C.

TL;DR: In this paper, a low-cost, new material, eco-friendly and reproducible microbes Bacillus subtilis mediated biosynthesis of TiO2 nanoparticles was reported.

TL;DR: In this paper, the microstructure, mechanical properties, shape memory effect, corrosion behavior and in vitro biocompatibilities were evaluated by X-ray diffraction, scanning electron microscopy, tensile tests, electrochemical tests, immersion tests in Hank's solution till 6 months, cytotoxicity and hemolysis tests.

TL;DR: In this article, the authors evaluated the influence of the sampling area of the stem on the mechanical properties of hemp fibers and found that a strong dependence of the fiber mechanical properties on their diameter is observed.

TL;DR: In this paper, a facile solvothermal method was used to synthesize sphere-like kesterite Cu 2 ZnSnS 4 (CZTS) nanoparticles.

TL;DR: A green procedure for the synthesis of silver nanoparticles (AgNPs) using the extract of Calotropis procera flower was described in this article, where parameters such as pH and reaction time were varied.

TL;DR: In this paper, a CuO nanosheets were synthesized via hydrothermal process and efficiently utilized as redox mediator for the fabrication of efficient ethanol chemi-sensor.

TL;DR: In this paper, the HPT-treated sample exhibited homogeneous corrosion due to the uniform distribution of the second phase of the nano-sized particles and distributed uniformly in grain interiors instead of along grain boundaries.

TL;DR: The morphology and porous structure of cellulose acetate (CA) fibers were highly dependent on the dichloromethane(DCM)/acetone ratio and the concentration of the solutions.

TL;DR: In this paper, the morphology and structure of the prepared α-MnO2 were investigated by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Xray diffraction (XRD).

TL;DR: In this paper, an electrospinning process for creating super-hydrophobic thermoplastic polyurethanes (TPU) mat with bead-on-string morphologies was described.

TL;DR: In this article, a phenomenological crystal plasticity model is modified to account for acoustic (ultrasonic) softening effects based on the level of ultrasonic intensity supplied to single and polycrystalline metals.

TL;DR: In this article, three different kinds of nanostructured calcium phosphate powders were achieved by changing the ratio of calcic and phosphorous sources with a molar ratio between 1.4 and 1.67.

TL;DR: CeO2-ZnO composite nanofibers were fabricated via the electrospinning technique using zinc acetate and cerium nitrate as the precursors, poly(vinylpyrrolidone) as the fiber template, and 2:1(v/v) ethanol/water mixtures as the co-solvent, followed by thermal treatment at 600 °C for 3 h as discussed by the authors.

TL;DR: In this paper, a deformation-induced ω phase transformation was introduced into β-type titanium alloys so that the Young's modulus of only the deformed part would increase during operation, while that of the non-deformed part remained low.

TL;DR: In this paper, the effect of calcining temperatures on photocatalytic activities of g-C3N4 samples were investigated based on the decomposition of phenol under visible light irradiation.

TL;DR: In this article, the antibacterial properties of pure Mg and AZ31 alloy with and without surface coatings were studied, and the results indicated that both pure and porous Si-coated alloy had strong antibacterial effect against Escherichia coli and Staphylococcus aureus with rapid increases of pH values of the bacterial suspensions.

TL;DR: In this paper, the effect of annealing temperature on the structural, topographical and optical properties of Zinc Oxide thin films prepared by sol-gel method was investigated using X-ray diffraction and the recorded patterns indicated that all the films had a preferred orientation along the (002) plane and the crystallinity along with the grain size were augmented with annaling temperature.