Showing papers in "Materials Letters in 2009"

TL;DR: In this paper, the synthesis of nanoparticles Cu and Cu 2 O using thermal decomposition and its physicochemical characterization was described, and as-prepared copper nano-particles were characterized by X-ray diffraction measurements (XRD), scanning electron microscopy (SEM), energy dispersive analysis of X-rays (EDAX), and Fourier transform infra-red spectroscopy (FTIR).

TL;DR: In this article, a 3D metal-organic framework (MOF) with 3D channels was synthesized by using ultrasonic method for the first time, and the reaction of cupric acetate and H 3 BTC in a mixed solution of DMF/EtOH/H 2 O (3:1:2, v / v ) under ultrasonic irradiation at ambient temperature and atmospheric pressure for short reaction times (5-60min) gave Cu 3 (BTC) 2 in high yields (62.6-85.1%).

TL;DR: In this article, the synthesis of gold nanoparticles by the non-conventional yeast Yarrowia lipolytica is described, and a novel application of the abundantly available biomass of Y.

TL;DR: In this article, a supercritical CO 2 processing technique for intercalating and exfoliating layered graphite is described, in which a few-layer graphene is produced by immersing powdered natural graphite in super critical CO 2 for 30 min followed by rapidly depressurizing the supercritical fluid to expand and exffoliate graphite.

TL;DR: In this article, a direct metal rapid prototyping (RP) fabrication technique, electron beam melting (EBM) process, was utilized to fabricate porous Ti6Al4V parts with fully interconnected, controlled internal pore architecture.

TL;DR: In this paper, the chitosan/PLA blend micro/nanofibers have been prepared for the first time by electrospinning and the morphology of the fibers was shown by scanning electron microscope (SEM).

TL;DR: In this paper, a facile method for fabricating fibers with micro-and nano-porous structure by electrospinning a ternary system of nonsolvent/solvent/poly( l -lactic acid) is presented.

TL;DR: In this paper, a method for the synthesis of uniform silver nanoparticles using a single silver reduction step is presented, which is achieved by varying the concentration of tannic acid, one of the reducing agents, resulting in uniform nanoparticles in the range of 18 nm to 30 nm in diameter with a standard deviation of less than 15%.

TL;DR: In this paper, the feasibility of using polymeric milling media to prepare hydroxyapatite nanoparticles is described, and the resulting nanoparticles exhibit an average size of about 20 to 23 nm.

TL;DR: It is concluded that silver nanoparticles present antibacterial activity on S. mutans and this property is better when the particle size is diminished.

TL;DR: In this paper, a novel wet electro-spinning system was established for the 3D structure control of nanofiber fabric by combining electrospinning and wet spinning system, which was successfully formed with simplicity and cheapness.

TL;DR: In this paper, the ultrafine grained (UFG) microstructure, mechanical properties and electric conductivity of the Cu alloys severely deformed by accumulative roll bonding (ARB) process were systematically investigated.

TL;DR: In this article, a monodispersed Ag-SiO 2 core-shell nanoparticles with a high concentration of 400 mg/L were successfully fabricated by using tetraethoxysilane as silica precursor and reducing silver nitrate with ascorbic acid in the presence of cetyltrimethylammonium bromide as stabilizing agent.

TL;DR: In this article, the role of pH in green synthesis of silver nanoparticles (AgNPs) is investigated and two reaction pathways are proposed to explain the formation of AgNPs, keeping in view the pH changes that occur on addition of different amounts of NaOH.

TL;DR: Results showed covalent attachment of chitosan and ch itosan-poly lactic acid to the carbon nanotubes.

TL;DR: In this article, Nanocrystalline nickel ferrite has been successfully synthesized through a simple hydrothermal process at 180°C for 10h. The as-synthesized powders were characterized by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) techniques.

TL;DR: In this article, focused ion beam (FIB) milling of ring-shaped trenches (ring drilling) induces controlled gradual strain relief at the surface of residually stressed samples, with the central island approaching the unstressed state.

TL;DR: The corrosion inhibition of mild steel in 1 M HCl solution by Streptomycin has been studied by Tafel polarization, electrochemical impedance spectroscopy (EIS) and weight loss measurement as mentioned in this paper.

TL;DR: In this paper, a microwave assisted solution-phase approach has been applied for the synthesis of zinc oxide nanostructures by using two reagents: hydrazine hydrate and ammonia.

TL;DR: In this paper, the Luffa fibres were treated by tow methods: alkali treatment and mixed treatment (sodium hydroxide and hydrogen peroxide) using SEM and XRD (X-Ray Diffraction) analysis.

TL;DR: In this article, a flexible electrically conducting nanocomposite polymer has been prepared by ultrasonic agitation with multi-walled carbon nanotubes (MWCNT) in polydimethylsiloxane (PDMS).

TL;DR: In this paper, the diameters of the single-walled carbon nanotubes (SWCNTs) were estimated to be between 0.6 nm and 1.2 nm by Field Emission Scanning Electron Microscopy (FESEM) and microraman analysis.

TL;DR: In this article, the electrophoretic mobility of chitosan in aqueous solution as a function of pH was studied, and the growth rate was estimated to vary in the range 0.02-0.08 µm/s depending on the pH value.

TL;DR: The characterization of composite metal foams was carried out using monotonic compression, compression fatigue, loading-unloading compression, micro-hardness and nanohardness testing.

TL;DR: In this article, a nano-sized iron oxide powder with average crystallite sizes 35, 100 and 150 nm was prepared by thermal evaporation and co-precipitation techniques.

TL;DR: In this paper, the dielectric breakdown behavior of an alkali-free barium boroaluminosilicate glass is shown to have remarkably high DC dielectrics breakdown strength (12mV/cm) and reasonably high permittivity (~6), equating to energy densities in excess of 35mJ/cm 3.

TL;DR: In this article, a study about the synthesis of colloidal silver (Ag)/biopolymer where Ag submicron particles were prepared in situ on bacterial cellulose (BC) produced by Gluconacetobacter xylinus was presented.

TL;DR: In this article, a series of stearic acid esters were synthesized via the reaction of n-butyl alcohol, isopropyl alcohol and glycerol and characterized by Fourier transform infrared spectroscopy (FT-IR) and 1H NMR techniques.

TL;DR: The static recovery of tempered lath martensite microstructure of strength enhanced ferritic steels has been investigated during very long-term aging up to 2 × 104 h at 650 −°C for 3 steels containing 9 to 12% Cr as mentioned in this paper.

TL;DR: In this paper, nanostructured zinc oxide (Nano-ZnO) film has been electrochemically deposited onto indium-tin-oxide (ITO) coated glass plate to co-immobilized urease (Urs) and glutamate dehydrogenase (GLDH) for urea detection.