Stabilization and Size Control of Gold Nanoparticles during Laser Ablation in Aqueous Cyclodextrins

Sylvestre, Jean‐Philippe; Kabashin, Andrei V.; Sacher, E.; Meunier, Michel; Luong, John H. T.

doi:10.1021/ja048678s

Cited by 337 publications

(235 citation statements)

References 18 publications

(43 reference statements)

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“…In particular, these two methods are used to prepare AgNPs in the form of thin films [17]. However, laser ablation can be used to synthesize AgNPs in solution [18]. In addition, AgNPs can be prepared by chemical reduction, such as microemulsion techniques [19], UV-initiated photo reduction [20], photo induced reduction [21], electrochemical synthetic methods [22], irradiation methods [23] and microwave-assisted synthesis [24].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Silver Nanoparticles and Their Use in Catalytic Reduction of 4-Nitrophenol

Al-Marhaby¹,

Seoudi²

2016

WJNSE

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Silver nanoparticles of various sizes were prepared at room temperature using silver nitrate as a precursor, various molar ratios of sodium citrate as a surfactant stabilizing material and sodium borohydride as a reducing agent. The morphology, distribution and sphericity of the particles were assessed in images from a transmission electron microscope (TEM). The sizes of the particles were calculated as being 9, 11 and 14 nm. The effects of the particles' sizes on the plasmon bands were confirmed by ultraviolet-visible spectra measurements. The prepared samples were applied in photo catalysis of 4-Nitrophenol (4-NP), and the rate constant was determined as 0.05 s −1 , 0.0015 s −1 and 0.00021 s −1 for particles of 9 nm, 11 nm and 14 nm, respectively. Due to their high surface energy, the smaller particle sizes were more active in the photo catalytic application.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Silver Nanoparticles and Their Use in Catalytic Reduction of 4-Nitrophenol

Al-Marhaby¹,

Seoudi²

2016

WJNSE

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“…Variation of laser ablation parameters [9,12] and chemical properties [13][14][15][16] of surrounding liquid media has been the primary focus of these studies. It has been demonstrated that the size of gold NPs produced in water increases with increasing laser pulse energy [17].…”

Section: Introductionmentioning

confidence: 99%

“…It has been demonstrated that the size of gold NPs produced in water increases with increasing laser pulse energy [17]. The variation in pH of various solutions influences not only the NP size [13,18], but also the stability of gold colloids [19]. Despite numerous attempts to control the structural properties of gold NPs through synthesis parameters, a solid explanation of the influence of added chemicals on the size of gold NPs has not yet been proposed.…”

Section: Introductionmentioning

confidence: 99%

Size Control of Gold Nanoparticles Synthesized by Laser Ablation in Liquid Media

Riabinina

Zhang

Chaker

et al. 2012

ISRN Nanotechnology

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We investigate the influence of salt, acidic, and basic solutions (citrate, NaOH, and HCl) on the size of gold nanoparticles (AuNPs) synthesized by laser ablation in aqueous media. We found that NP size increases from 3 nm to 13 nm when Zeta potential varies from −100 mV to −10 mV whatever the concentration and the nature of chemical solution are namely, citrate, NaOH, and HCl. These results demonstrated that the final size of gold NPs produced by laser ablation in liquid media is mainly governed by the charge-dependent growth mechanism.

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“…Laser ablation and fragmentation in liquids are increasingly popular techniques for the rapid and simple production of inorganic and organic nanoparticles [15][16][17]. In laser ablation, a solid target is irradiated and the ejected material forms nanoparticles in the surrounding liquid.…”

Section: Introductionmentioning

confidence: 99%

Nanonization of megestrol acetate by laser fragmentation in aqueous milieu

Sylvestre

Tang

Fürtös

et al. 2011

Journal of Controlled Release

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Nanonization is a simple and effective method to improve dissolution rate and oral bioavailability of drugs with poor water solubility. There is growing interest to downscale the nanocrystal production to enable early preclinical evaluation of new drug candidates when compound availability is scarce. The purpose of the present study was to investigate laser fragmentation to form nanosuspensions in aqueous solution of the insoluble model drug megestrol acetate (MA) using very little quantities of the drug. Laser fragmentation was obtained by focusing a femtosecond (fs) or nanosecond (ns) laser radiation on a magnetically stirred MA suspension in water or aqueous solution of a stabilizing agent. The size distribution and physicochemical properties of the drug nanoparticles were characterized, and the in vitro dissolution and in vivo oral pharmacokinetics of a laser fragmented formulation were evaluated. A MA nanosuspension was also prepared by media milling for comparison purpose. For both laser radiations, smaller particles were obtained as the laser power was increased, but at a cost of higher degradation. Significant nanonization was achieved after a 30-min fs laser treatment at 250 mW and a 1-h ns laser treatment at 2500 mW. The degradation induced by the laser process of the drug was primarily oxidative in nature. The crystal phase of the drug was maintained, although partial loss of crystallinity was observed. The in vitro dissolution rate and in vivo bioavailability of the laser fragmented formulation were similar to those obtained with the nanosuspension prepared by media milling, and significantly improved compared to the coarse drug powder. It follows that this laser nanonization method has potential to be used for the preclinical evaluation of new drug candidates.

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Stabilization and Size Control of Gold Nanoparticles during Laser Ablation in Aqueous Cyclodextrins

Cited by 337 publications

References 18 publications

Preparation and Characterization of Silver Nanoparticles and Their Use in Catalytic Reduction of 4-Nitrophenol

Preparation and Characterization of Silver Nanoparticles and Their Use in Catalytic Reduction of 4-Nitrophenol

Size Control of Gold Nanoparticles Synthesized by Laser Ablation in Liquid Media

Nanonization of megestrol acetate by laser fragmentation in aqueous milieu

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