Synthesis of Au Nano-particles under Energetic Irradiation Fields

2005 ◽  
Vol 900 ◽  
Author(s):  
Nobuhiro Maeda ◽  
Taiei Hiroki ◽  
Fuminobu Hori ◽  
Shuichi Okuda ◽  
Ryoichi Taniguchi ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Polyethylene Glycol ◽  
Aqueous Solutions ◽  
Nano Particles ◽  
Nano Particle ◽  
Carbon Ions ◽  
Transmission Electron ◽  
Dilute Aqueous Solutions ◽  
Γ Ray ◽  
Au Nano Particles

ABSTRACTDilute aqueous solutions with Au3+ ions and Polyethylene Glycol Monostearate are irradiated with ∼1 MeV γ-ray from 60Co source, 10 MeV pulsed electrons or 1.6 GeV carbon ions. After the irradiation, the color of solutions changes from buff yellow to reddish color. The UV-vis absorption spectra show that after the irradiation, light absorption around 530 nm appears, which corresponds to the excitation of the surface plasmon due to Au nano-particles. The result confirms that the irradiation reduces Au3+ ions in the aqueous solutions and synthesizes Au nano-particles. Size and shape of the nano-particles are examined by using 200kV transmission electron microscope. Effects of irradiation parameters (total dose and dose rate) on Au nano-particle synthesis are discussed.

Preparation and Characterization of Magnetic Strong-Base Anion Exchange Resin

2011 ◽  
Vol 239-242 ◽  
pp. 1838-1841 ◽  
Author(s):  
Chen Dong Shuang ◽  
Feng Yang ◽  
Yang Zhou ◽  
Peng Hui Li ◽  
Ai Min Li
Keyword(s):  
Electron Microscope ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Nano Particles ◽  
Nano Particle ◽  
Strong Base ◽  
Transmission Electron ◽  
Ft Ir ◽  
Magnetic Nano Particles

The magnetic copolymer was prepared by polymerization of glycidyl methacrylate (GMA) and divinylbenzene (DVB) in the presence of OA-modified magnetic nano-particles. The magnetic strong-base anion exchange resin (MAER) was formed by quaternization of magnetic copolymer. Transmission electron microscope (TEM) and scanning electron microscope (SEM) were used for observation of prepared magnetic nano-particle and MAER, respectively. FT-IR spectrometer was used to characterize the magnetic nano-particle and MAER. To explore the potential application of MAER for natural organic matter (NOM) removal, completely-mixed (CMC) mode was used for humic acid (HA) adsorption. It was found that the HA removal for CMC mode with MAER resin was 10~20% higher than conventional process before breakthrough.

scholarly journals MICROWAVE ASSISTED SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF NICKEL OXIDE NANOPARTICLES

2016 ◽  
Vol 3 (1) ◽  
pp. 12-14
Author(s):  
Kalpanadevi K ◽  
Manimekalai R
Keyword(s):  
Electron Microscope ◽  
Nickel Oxide ◽  
Structural Characterization ◽  
Nano Particles ◽  
Microwave Assisted Synthesis ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
Transmission Electron ◽  
Good Crystallinity

Nickel oxide (NiO) nano-particles were produced via a simple microwave method from the Ni(OH)2 precursor, which was obtained by slow drop-wise addition of 0.1M sodium hydroxide to 0.1M nickel nitrate. The mixture was vigorously stirred until the pH reached 7.2. The mixture was then irradiated with microwave to deposit Ni(OH)2 at a better precipitation rate. Drying the precipitate at 320°C resulted in formation of NiO nanoparticles. High Resolution Transmission Electron Microscope (HRTEM), Scanning Electron Microscope (SEM) and X-ray diffraction (XRD), employed for the structural characterization of the as-prepared NiO nanoparticles, revealed their good crystallinity and high-purity. Microwave irradiation increased homogeneity and decreased the mean particle size of the produced NiO particles.

A Novel Nano-Water-Purifying Material

2007 ◽  
Vol 29-30 ◽  
pp. 367-370
Author(s):  
W. Han ◽  
Ming Xia Lu ◽  
H. Wang ◽  
G. Liu
Keyword(s):  
Heavy Metals ◽  
Electron Microscope ◽  
Metal Removal ◽  
Low Cost ◽  
Heavy Metal Removal ◽  
Public Health Problem ◽  
X Ray Diffraction ◽  
Nano Powder ◽  
Transmission Electron ◽  
Dilute Aqueous Solutions

Water contaminated by heavy metals remains a serious environmental and public health problem. The toxic effects of heavy metals on the biosphere have been demonstrated by a number of studies. Since the main sources of heavy metals for humans are water and food, the monitoring of the heavy metals content in natural water is of paramount importance. Diverse technologies have been used to reduce the contents of heavy metals in water. Recently, adsorption methods have been widely used because of their low cost. The novel nano-water-purifying material used in our work is composed of AlO(OH) nanoparticles loaded onto glass fibre and supported by active carbon felt. The Al nano-powder starting material, was prepared using an electric explosive technique. The products were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, and BET techniques. It was found that the particles consisted of AlO(OH) nanofibres of pure boehmite structure. They exhibited a surface area of 431.7 m2 / g. The composite material was found to be effective in removing cadmium from dilute aqueous solutions and could find broad application in heavy metal removal.

Synthesis, Characterization and Growth Mechanism of Nano-Scale Hydroxyl Magnesium Silicate

2010 ◽  
Vol 92 ◽  
pp. 263-270
Author(s):  
Fei Gao ◽  
Yi Xu ◽  
Bin Shi Xu ◽  
Bao Sen Zhang
Keyword(s):  
Electron Microscope ◽  
Growth Mechanism ◽  
Magnesium Silicate ◽  
Nano Particles ◽  
Hydrothermal Conditions ◽  
Monoclinic Crystal ◽  
Nano Scale ◽  
System A ◽  
Transmission Electron ◽  
Sem Micrograph

Nano-scale hydroxyl magnesium silicate was synthesized successfully by using hydrothermal method. The composition of as-prepared powder was proved chrysotile which adheres to monoclinic crystal system (a kind of hydroxyl magnesium silicate) by using X-ray Diffraction (XRD) technology. The morphology and microstructure of chrysotile powder were characterized by using scanning electron microscope (SEM) and transmission electron microscope (TEM). Nano-particles and nano-rods were observed in SEM micrograph. Moreover, smaller-size nano-particles and nano-fibres were observed by using TEM. Based on results of SEM and TEM, the growth mechanism of chrysotile powder under hydrothermal conditions was discussed.

Fabrication of PVA Fibers Loaded with Fe3O4 Nano Particles Using Electrospinner

2015 ◽  
Vol 1123 ◽  
pp. 237-240
Author(s):  
Harsojo ◽  
Anita Fira Waluyo ◽  
Harini Sosiati ◽  
Kuwat Triyana
Keyword(s):  
Electron Microscope ◽  
Electrospinning Process ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
X Ray ◽  
Nano Powder ◽  
Transmission Electron ◽  
Syringe Needle ◽  
Size Of Particles

It has been studied the fabrication of a sheet made of polyvinyl alcohol (PVA) fibers loaded with Fe3O4 nanomagnetic materials using an electrospinning technique. The solution for the electrospinner was prepared by stirring nano powder of Fe3O4 with a solution of 10% PVA in water at room temperature. The electrospinning process was done under fixed of 15 kV DC voltage, using 12 cm distance between the electrodes, and using a syringe needle having a diameter of 0.4 mm. The morphology of fibers was tested using scanning electron microscope (SEM), while the size of particles was tested using transmission electron microscope (TEM). Moreover, the crystallinity of fibers was tested using Laue and x-ray diffraction, while the magnetic moment was tested using a vibrating sample magnetometer (VSM). The result shows that the PVA sheet composing of fibers having a diameter in the range of 130 mm to 250 mm, accommodating Fe3O4 nano particles in the range of 15 mm to 25 mm, indicating a partial superparamagnetic property.

scholarly journals Effect of Gamma-Ray Irradiation on the Growth of Au Nano-Particles Embedded in the Germano-Silicate Glass Cladding of the Silica Glass Fiber and its Surface Plasmon Resonance Response

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1666 ◽  
Author(s):  
Seongmin Ju ◽  
Won-Taek Han
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Total Dose ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Silica Glass ◽  
Nano Particles ◽  
Au Nps ◽  
Γ Ray ◽  
Au Nano Particles

The effect of γ-ray irradiation on the surface plasmon resonance (SPR) sensing capability of refractive index (n = 1.418–1.448) of the silica glass optical fiber comprised of germano-silicate glass cladding embedded with Au nano-particles (NPs) was investigated. As the γ-ray irradiation increased from 1 h to 3 h with the dose rate of 1190 Gy/h, the morphology of the Au NPs and the SPR spectrum were found to change. The average diameter of Au NPs increased with the aspect ratio from 1 to 2, and the nano-particles became grown to the clusters. The SPR band wavelength shifted towards a longer wavelength with the increase of total dose of γ-ray irradiation regardless of the corresponding refractive indices. The SPR sensitivities (wavelength/refractive index unit, nm/RIU) also increased from 407 nm/RIU to 3553 nm/RIU, 1483 nm/RIU, and 2335 nm/RIU after the γ-ray irradiation at a total dose of 1190 Gy, 2380 Gy, and 3570 Gy, respectively.

scholarly journals Effect of 60Co γ-Ray Irradiation on Dilute Aqueous Solutions of Surfactants

RADIOISOTOPES ◽  
1978 ◽  
Vol 27 (1) ◽  
pp. 20-26 ◽  
Author(s):  
Teruko SAWAI ◽  
Toshinari SHIMOKAWA ◽  
Yasushi MIKI ◽  
Koichi OSEKO ◽  
Takeshi SAWAI
Keyword(s):  
Aqueous Solutions ◽  
Dilute Aqueous Solutions ◽  
Γ Ray
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