Showing papers in "Materials Letters in 2007"

TL;DR: The fungus Aspergillus flavus when challenged with a silver nitrate solution accumulated silver nanoparticles on the surface of its cell wall in 72h as discussed by the authors, and these nanoparticles dislodged by ultrasonication showed an absorption peak at 420 nm in UV-visible spectrum corresponding to the plasmon resonance of silver.

TL;DR: In this article, the bacteria Rhodopseudomonas capsulata was screened and found to successfully produce gold nanoparticles of different sizes and shapes, but the important parameter which controlled the size and shape of gold nano particles was pH value.

TL;DR: In this paper, kenaf bast fibers, supplied by MARDI, for use in fiber-reinforced composites, were modified using NaOH of different concentrations, and a series of fiber bundle tensile tests were also performed to evaluate the effect of the treatments on the fiber tensile strength.

TL;DR: In this paper, the AlCoCrCuFeNi high-entropy alloy system was synthesized using a well-developed arc melting and casting method and its elemental effect on microstructures and hardness was investigated with X-ray diffraction, scanning electron microscopy and Vickers hardness testing.

TL;DR: For the first time, TEA (triethanolamine) as a surfactant has been used for the preparation of ZnO nanoparticles with 3 to 4nm size and spherical shape.

TL;DR: In this article, a similar reaction with hydrazine hydrate (HH) and sodium formaldehyde sulfoxylate (SFS) in polymer afforded only a mixture of Cu 2 O and Cu.

TL;DR: In this paper, the synthesis of nano-HA particles via a sol-gel method was described, and the obtained powder after heat treatment at 600°C was agglomerated and composed of nanocrystalline (25-28nm) HA particles.

TL;DR: In this paper, chicken eggshell (ES) was used as bio-filler for polypropylene (PP) composite by tensile test and the Young's modulus (E) was improved with the increment of ES content.

TL;DR: In this article, a colloidal method was used to synthesize iron oxide nanoparticles at room temperature, without use of surfactants and using precursors like FeCl 3 ·6H 2O and FeCl 2 ·4H 2 O; deionizated water free of dissolved oxygen and ammonia solution (29% vol.) and using several aging times (2, 5 and 10

TL;DR: In this article, a facile gas flame combustion method was used to synthesize ultrafine TiO2 nanoparticles by using X-ray diffraction, transmission electron micrograph (TEM), Fourier transform infrared (FTIR), and photoluminescence (PL) spectroscopy.

TL;DR: In this article, a simple polyol method was developed to synthesize uniform sphere-like Co 3 O 4 nanocrystals in ethylene glycol, which was indexed as the cubic spinel structure.

TL;DR: In this paper, a mixture of HFP/TFA solvent was used for electrospinning of the collagen-chitosan complex nanofibers for tissue engineering and to develop functional biomaterials.

TL;DR: In this article, a functionally graded structure for hollow particle (microballoon) filled syntactic foams is fabricated that is capable of withstanding compression for 60-75% strain without any significant loss in strength.

TL;DR: In this paper, the effect of TIG welding on corrosion behavior of 316L stainless steel in physiological solution was investigated with potentiodynamic polarization curves and X-ray diffraction analysis.

TL;DR: In this article, the optical and photoluminescent properties of al-doped zinc oxide (AZO) thin films have been investigated via a sol-gel process and efficient green-yellow emission was obtained after annealing at 850°C.

TL;DR: In this paper, the sign and magnitude of the third-order nonlinearity from the closed aperture Z-scan data were evaluated while the nonlinear absorption properties were assessed using the open aperture data.

TL;DR: In this paper, carbon nanotubes (CNTs) were added to polyvinyl alcohol (PVA) hydrogels to modify their mechanical properties, such as tensile modulus, tensile strength and strain at break.

TL;DR: In this paper, the surface morphology of Ni-W/SiC nanocomposite coatings with various contents of SiC nano-particulates were observed using a scanning electron microscope (SEM).

TL;DR: The cumulative effects of molecular weight and concentration on the structural transitions in the electrospun polymer have been studied in this article, where experiments have been conducted with water as the solvent for molecular weights of polyvinyl alcohol (PVA) ranging from 9500g/mol to 155,000 g/mol.

TL;DR: In this article, the microstructure performance of Mg/Al TIG welded joint was studied by means of metallography, micro-hardness test and SEM.

TL;DR: In this paper, the microstructure characteristics and the distribution of carbon nanotubes in the aluminum matrix were investigated, and it was shown that CNTs were distributed homogeneously in the composite, and the interfaces of Al-CNTs bonded well.

TL;DR: In this article, the potential of nanomaterials for activation of the initial strength of belite cements was analyzed and the results showed that the addition of nanoparticles can overcome the drawbacks of this type of eco-efficient cements making them competitive to OPC.

TL;DR: In this paper, phase pure nanosized BiFeO 3 powders are prepared by sonochemical and micro-emulsion techniques in the temperature range of 400°C and at 500°C which is much lower than that of the conventional preparation methods.

TL;DR: In this article, the reflection loss, matching frequency, and matching thickness were calculated using the theory of the absorbing wall for a carbon nanotubes encapsulated metal Fe in a frequency range of 8-18 GHz.

TL;DR: In this paper, the authors fabricated highly porous hydroxyapatite (HA) bioceramics using the camphene-based freeze casting method, which allowed the fabricated sample to have completely interconnected pore channels by removing the frozen camphene network via sublimation.

TL;DR: CeO 2 nanocrystalline was obtained as a final decomposition product of hydrated cerium carbonate formed by using ammonium bicarbonate as precipitant as discussed by the authors.

TL;DR: In this article, WO 3 nanowires were fabricated by a hydrothermal method in the presence of K 2 SO 4, and they exhibit a well crystallized one-dimensional structure with 10nm in diameter and several microns in length.

TL;DR: In this article, the size of bioactive glasses could be controlled via addition of ammonia solution, and the TEM images showed that the NBG particles size were 20-40nm using 1-M ammonia solutions.

TL;DR: Luminescent and stable CdSe/ZnS core/shell quantum dots (QDs) capped with sulfur calixarene are prepared for the selective determination of mercury ions in acetonitrile with high sensitivity.

TL;DR: In this paper, a modified sol-gel method and spherical NiO nanoparticles were obtained and the factors that influence the physical properties of NiO particles were investigated mainly through the use of SEM, BET and XRD.