Fabrication of Silver Nanoparticles Dispersed in Palm Oil Using Laser Ablation

Zamiri, Reza; Zakaria, Azmi; Ahangar, Hossein Abbastabar; Sadrolhosseini, Amir Reza; Mahdi, Mohd Adzir

doi:10.3390/ijms11114764

Cited by 48 publications

(28 citation statements)

References 16 publications

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“…Red shi in surface plasmon resonance peak has been observed as usually it is at $400 nm for Ag. 32,33 The observed red shi in surface plasmon resonance peak indicating reduction in electron density of Ag in ZnO/Ag nanostructures. This reduction can be explained according to the Fermi energy levels of ZnO and Ag, as the ZnO work function (4.3 eV) is larger than Ag (4.1 eV), therefore the Fermi level of ZnO is located lower to Ag Fermi level.…”

Section: Resultsmentioning

confidence: 99%

Far-infrared optical constants of ZnO and ZnO/Ag nanostructures

et al. 2014

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We report on the synthesis of ZnO nanoplates and ZnO nanoplate/Ag nanoparticle heterostructures via a simple and cost effective wet chemical precipitation method. The prepared samples were characterized for structural and optical properties by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), UV-VIS reflectance, Raman, and FT-IR spectroscopy. The Kramers Kronig (K K) method and classical dispersion theory was applied to calculate the far-infrared optical constants such as, refractive index n(u), dielectric constant 3(u), transverse optical phonon (TO) and longitudinal (LO) optical phonon modes. We determined various optical constant values n(u) and 3(u) for ZnO nanostructures in the range of 0 to 9 and 0 to 70, respectively. Whereas, for Ag deposition on ZnO nanostructures, the corresponding n(u) and 3(u) values were found to be increased in the range of 0 to 30 and 0 to 800, respectively. The TO and LO optical phonon modes of ZnO nanoplate/Ag nanoparticle heterostructures were also found to be higher (416 cm 1 , 620 cm

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Section: Resultsmentioning

confidence: 99%

Far-infrared optical constants of ZnO and ZnO/Ag nanostructures

et al. 2014

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“…The experimental apparatus used for laser ablation of metal plate has been described elsewhere. [1][2][3][4] The beam was focused onto the target using a 25 cm focal length lens. The plate was then removed from the glass cell, and the silver nanoparticles were irradiated by another Q-switched Nd:YAG pulsed laser (SL400/SL800 system) of wavelength 532 nm, duration 10 nsec, and pulse energy 60 mJ for 15 minutes.…”

Section: Methodsmentioning

confidence: 99%

“…Fabrication of metal nanoparticles by laser ablation of bulk plate in liquid media has been investigated intensively in recent research. [1][2][3][4] The results of these studies have shown that laser beam irradiation onto metal nanoparticles causes fragmentation or fusion of the particles due to photothermal melting. [5][6][7][8][9] Therefore, laser irradiation can be used to control the shape and size of particles.…”

Section: Introductionmentioning

confidence: 99%

Formation of silver microbelt structures by laser irradiation of silver nanoparticles in ethanol

Zamiri¹,

Zakaria²,

Husin³

et al. 2011

IJN

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In the present work, we prepared silver nanoparticles by laser ablation of pure silver plate in ethanol and then irradiated the silver nanoparticles using a 532 nm Q-switched Nd:YAG pulsed laser. Transmission electron microscopic images of the sample after irradiation clearly showed formation of big structures, such as microrods and microbelts in ethanol. The obtained microbelts had a width of about 0.166 μm and a length of 1.472 μm. The reason for the formation of such a big structure is the tendency of the nanoparticles to aggregate in ethanol before irradiation, which causes fusion of the nanoparticles.

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“…It was shown that the increase of nanoparticle concentration led to reduced friction coefficient and wear rate. Further studies have demonstrated that lasersynthesized Cu and Ag nanoparticles in vegetable oils possess excellent stability due to high viscosity and surface-adsorbed long-chain hydrocarbons [30][31][32]. This laser ablation technique is of particular benefit for lubricants due to the absence of precursors and ligands, which can have an impact on the tribological properties.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Stability of Metal Nanoparticles in Engine Oil under Thermal and Mechanical Load

2017

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Extended colloidal stability and high dispersion degree of nanolubricants are required to avoid nanoparticle deposition in combustion engines and to reduce friction and wear. The simple and rapid one-step technique of pulsed laser ablation in liquids is employed to synthesize precursor-free and highly dispersed gold nanoparticles in lubricants while the colloidal stability is measured by optical spectroscopy and transmission electron microscopy. A remarkable colloidal stability is determined under engine-like and ambient conditions for nine months in terms of constant primary particle size. In contrast to additive-free oils, almost no agglomeration is observed, which might be attributed to the attachment of engine oil additives or pyrolyzed/oxidized molecules to the nanoparticles preventing attractive nanoparticle interactions.

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Fabrication of Silver Nanoparticles Dispersed in Palm Oil Using Laser Ablation

Cited by 48 publications

References 16 publications

Far-infrared optical constants of ZnO and ZnO/Ag nanostructures

Far-infrared optical constants of ZnO and ZnO/Ag nanostructures

Formation of silver microbelt structures by laser irradiation of silver nanoparticles in ethanol

Colloidal Stability of Metal Nanoparticles in Engine Oil under Thermal and Mechanical Load

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