Showing papers in "Materials Research Bulletin in 2011"

TL;DR: In this paper, the synthesis of nanostructured zinc oxide nanoparticles by both chemical and biological method was reported, and the results showed that the particles obtained were poly dispersed and the average size ranged from 25 to 40nm.

TL;DR: In this paper, microwave assisted chemical reduction in aqueous medium using the biopolymer, starch as a stabilizing agent was used as reducing agent for metallic and bimetallic nanoparticles of copper and silver.

TL;DR: In this paper, the electrocaloric effect (ECE) of lead-free ferroelectric ceramics was characterized via P-T curves under different electric fields, which indicated that the NBT has an abnormal ECE with a negative temperature change (ΔT140 −−0.33 −kV/cm) opposite to that of the normal ferroelectrics.

TL;DR: Graphene nanosheet/alumina composite has been prepared by spark plasma sintering as discussed by the authors, which is a homogeneous distribution of nanosheets in an alumina matrix could be obtained by the electrostatic attraction between graphite oxide and alumina particles and their subsequent reduction.

TL;DR: Using nickel and ferric nitrates and citric acid, NiFe 2 O 4 nanoparticles are prepared by a simple and cost-effective polyvinylpyrrolidone (PVP) assisted sol-gel auto-combustion method.

TL;DR: In this paper, water-soluble fluorescent carbon nanoparticles were synthesized directly from active carbon by a one-step hydrogen peroxide-assisted ultrasonic treatment, which showed that the surface of carbon was rich of hydroxyl groups resulting in high hydrophilicity.

TL;DR: In this article, the photocatalytic activity of Ni-doped ZnO nanorods was studied by comparing the degradation rate of rhodamine B (RB) under UV-light irradiation.

TL;DR: In this article, a polyvinyl alcohol (PVA) assisted sol-gel auto-combustion method was used to extract single-phase nickel ferrite (NiFe 2 O 4 ) nanoparticles.

TL;DR: LiSrPO 4 :Dy 3+ phosphors for white light-emitting diodes (w-LEDs) were synthesized by the conventional solid-state reaction as discussed by the authors.

TL;DR: In this article, a leaf extract-mediated green chemistry approach for the synthesis of silver nanoparticles was described and the nanoparticles were characterized by ultraviolet-visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), energy dispersive x-ray analysis (EDAX), and transmission electron microscopy (TEM).

TL;DR: In this article, the authors evaluated the bactericidal effect of different silver-containing materials where silver is available as Ag + (silver nitrate and different silver exchanged zeolites), as metallic Ag 0 (commercial silver nanoparticles) or as oxide (silver (I) oxide) was carried out in order to elucidate the importance of the bioavailability of silver (i.e., as free ions, metallic particles, combination of them, clusters, complexes, partially soluble or insoluble salts, etc.) on its bactericidal action.

TL;DR: In this paper, the performance of Sn-doped ZnO nanorods was characterized by X-ray diffraction, field emission scanning electron microscope, UV-vis spectroscopy, Raman spectra, solid-state nuclear magnetic resonance (NMR) spectra and room temperature photoluminescence spectra.

TL;DR: In this paper, a simple molten salt method was used to prepare nanosize α-Fe 2 O 3, as well as its electrochemical performance as anode material for lithium ion batteries.

TL;DR: In this paper, a mass gain for copper nanoparticles with a mean diameter of 20nm in a 20% oxygen-nitrogen atmosphere was measured at 150-300°C using thermogravimetry (TG).

TL;DR: In this paper, a paper by Truffault et al. describing the structural and chemical properties of pure and calcium-doped ceria nanopowdered materials, is commented upon and the area of major disagreement is concerned with the peak fitting procedures which the authors adopted to extract Ce3 and Ce4+ atomic percentages from their XPS Ce(3d) spectra.

TL;DR: In this article, a nano-scale crystallite powder of nickel substituted zinc ferrite with the general formula Ni{sub x}Zn{sub 1-x}Fe{sub 2}O{sub 4} (x = 0, 0.2, 0., 0.8, 1) have been synthesized via sol-gel auto-combustion method using tartaric acid as combustion-complexing agent.

TL;DR: In this article, the effect of different propellants (urea, glycine, citric acid and sucrose) in the preparation of LSCF powders by the combustion method and also the influence of the sintering temperature on the porosity and electrical conductivity was investigated.

TL;DR: Wang et al. as mentioned in this paper further studied the mechanism study of Mg(OH) 2 nanoplatelets against Escherichia coli, and found that the membrane of the bacterial cell was destroyed by the direct contact with the Mg((OH)-2 nanoplatelet, leading to the cell death.

TL;DR: The fluorescence intensity ratio technique for two fluoroindate glass samples has been carried out in this article, where the green emissions at 523 and 750 nm were analyzed as a function of temperature from 20 K to 300 K, obtaining a maximum sensitivity of 0.0036 K −1 at 59 K.

TL;DR: In this paper, the dielectric properties and impedance spectroscopy of perovskite SmFeO 3 ceramics were studied in the frequency range of 100 Hz to 1 MHz in the temperature range from 80 K to 300 K.

TL;DR: In this paper, the bloom-like manganese oxide nanomaterials were fabricated via a facile route using a hydrothermal treatment at 120°C for 12h.

TL;DR: In this article, the photooxidation activity of Bismuth oxyiodides and oxides was evaluated by photocatalytic decolorization of acid orange II under both visible light and UV light (λ = ǫ 1.5 n). And the results showed that a series of changes in the compounds take place during the course of calcination, described as: BiOI→ Bi5O7I→ α-Bi2O3.

TL;DR: In this paper, the cost effective activated carbon (AC) has been prepared from sorghum pith by NaOH activation at various temperatures, including 300, 400, and 500°C, for the electrodes in electric double layer capacitor (EDLC) applications.

TL;DR: In this paper, a green process for biosynthesis of silver nanomaterials by some Egyptian bacterial isolates was developed by screening an in-house culture collection consisting of 300 bacterial isolate for silver nanoparticle formation.

TL;DR: In this paper, a template-free, economical hydrothermal method was used to selectively synthesize solid spindles and hollow spindle, respectively, using FeCl 3 ·6H 2 O as the starting materials and NaOH as the homogeneous precipitant.

TL;DR: In this article, the mesoporous nature of both pure and Cr 3+ doped TiO 2 powders, with specific surface area of 7.4 and 6.6 m 2 ǫg −1, respectively, is maintained even at calcination temperature of 800 ǔ°C.

TL;DR: ZnO-TiO 2 nanocomposite was prepared by modified ammonia-evaporation-induced synthetic method in this article, which leads to visible light absorption, larger charge transfer resistance and lower capacitance.

TL;DR: UV–vis and fluorescence spectra show that a spontaneous binding process occurred between hemoglobin and gold nanoparticles, and Thermodynamic parameters indicate that the binding was mainly due to hydrophobic interactions.

TL;DR: In this article, the photocatalytic activity of the catalysts were evaluated for the degradation of isoproturon herbicide under solar light irradiation, and the presence of Bi 3+ δ + species are playing a vital role in minimizing the electron hole recombination resulting higher activity compared to bare TiO 2.

TL;DR: In this paper, a kinetic analysis of the thermogravimetric curves for the thermal decomposition processes of PVA/PbS was performed and the results showed that the acceleration of thermal degradation for pure PVA was faster than PVA and PbS nanocomposite.