Nickel oxide nanoparticles: Synthesis and spectral …

Presumably, the ionic surfactants in solution can surround the nanoparticles via their positive or negative ends to prevent these particles from being agglomerated and therefore decreasing the particle size of the nanoparticles. The use of surfactants as micelle-forming agents, such as PEG-400, has also been reported for the synthesis of other metal oxides [,].The present method, however, is superior to other synthetic methods of a kind as it produces homogeneous, uniform and mono-disperse nanosized particles. In addition, the preparation method is an easy one and there was no need for heat treatment.

A Novel Synthesis Process for Making Nickel Oxide Nanoparticles

Synthesis of nickel and nickel oxide nanoparticles via heat-treatment of simple octanoate precursor

Optimization of Nickel Oxide Nanoparticles Synthesis through ..

The study of new biosynthetic routes of metal oxide NPs is important to identify alternatives to chemical and physical methods. After biosorption, a fraction of the dead H. lixii biomass loaded with NPs was examined by TEM and HRTEM (Figs and ). The TEM and HRTEM images provided information about the location of the nickel oxide NPs in the dead biomass and revealed the presence of extra and intracelular NPs. shows absence of NPs in the control. Ultrastructural changes included the shrinking of cytoplasmatic material in the control and in the biomass containing the metal NPs, which was probably the result of the autoclaving process (). TEM analysis revealed a predominantly spherical shape of the extra and intracellular nickel oxide NPs, which had an average diameter of 3.8 and 1.25 nm, respectively. The NPs formed inside the fungal cells were smaller than extracellularly produced NPs. The extra and intracellular synthesis of NPs of other metals has been reported, but those studies have used live fungal biomass [].

Synthesis of nickel oxide nanoparticles using pulsed …

In this study only dead biomass of H. lixii was used for the analysis of nickel oxide NPs production since it exhibited a high adsorption capacity of the nickel metal ion than live and dried biomass. Biosynthesis of nickel oxide NPs by dead biomass of H. lixii was investigated under the following conditions: contact time of 90 min, initial pH 4.0, temperature of 30°C, agitation speed of 150 rpm, 1.0 g of the biosorbent, and a solution containing 100 mg L-1 of nickel (II). The synthesized nickel oxide NPs were characterized by transmission electron microscopy (TEM) (JEOL-1010) operating at 100 kV, high-resolution transmission electron microscopy (HRTEM) (JEOL JEM2100 equipped with a LaB6 gun) operating at 200 kV, X-ray photoelectron spectroscopy (XPS) (UNI-SPECS UHV System), scanning electron microscopy (SEM) (JEOL 6460 LV) equipped with an energy dispersive spectrometer (EDS) and infrared vibrational spectroscopy FTIR (Bruker ALPHA) using an attenuated total reflectance accessory of single reflection (ATR with platinum-crystal diamond).

based wholesale manufacturer of Iron Nickel Oxide Nanoparticle Dispersion

Synthesis of nickel and cobalt sulfide nanoparticles using a low ..

The nanoparticles are in a grid that provides high surface area for the reaction, is activated by sunlight and can work in water, making them useful for cleaning up oil spills. Researchers are using as a room temperature catalyst to breakdown volatile organic pollutants in air. are being used to clean up carbon tetrachloride pollution in ground water. Iron oxide from water wells. Researchers have used nanoparticles called nanotetrapods studded with nanoparticles of carbon to develop .

The possible formation mechanism of the octahedral nickel oxide nanoparticles was discussed.

Synthesis of Zinc Oxide Nanoparticles - YouTube

A facile reduction approach with nickel acetylacetonate, Ni(acac) 2, and sodium borohydride or superhydride leads to monodisperse nickel nanoparticles in the presence of hexadecylamine (HDA) and trioctylphosphine oxide (TOPO). The combination of HDA and TOPO used in the conventional synthesis of semiconductor nanocrystals also provides better control over particle growth in the metal nanoparticle synthesis. The size of Ni nanoparticles can be readily tuned from 3 to 11 nm, depending on the ratio of HDA to TOPO in the reaction system. As-synthesized Ni nanoparticles have a cubic structure as characterized by power X-ray diffraction (XRD), selected-area electron diffraction (SAED). Transmission electron microscopy (TEM) images show that Ni nanoparticles have narrow size distribution. SQUID magnetometry was also used in the characterization of Ni nanoparticles. The synthetic procedure can be extended to the preparation of high quality metal or alloy nanoparticles.

21.11.2009 · Synthesis of nickel zinc iron nanoparticles by ..

structural and optical properties of Nickel Oxide nanoparticles ..

The use of dead biomass of the fungus Hypocrea lixii as a biological system is a new, effective and environmentally friendly bioprocess for the production and uptake of nickel oxide nanoparticles (NPs), which has become a promising field in nanobiotechnology. Dead biomass of the fungus was successfully used to convert nickel ions into nickel oxide NPs in aqueous solution. These NPs accumulated intracellularly and extracellularly on the cell wall surface through biosorption. The average size, morphology and location of the NPs were characterized by transmission electron microscopy, high-resolution transmission electron microscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The NPs were mainly spherical and extra and intracellular NPs had an average size of 3.8 nm and 1.25 nm, respectively. X-ray photoelectron spectroscopy analysis confirmed the formation of nickel oxide NPs. Infrared spectroscopy detected the presence of functional amide groups, which are probable involved in particle binding to the biomass. The production of the NPs by dead biomass was analyzed by determining physicochemical parameters and equilibrium concentrations. The present study opens new perspectives for the biosynthesis of nanomaterials, which could become a potential biosorbent for the removal of toxic metals from polluted sites.