Continuous Tuning of Silver Nanoparticle Size in a Water‐in‐Supercritical Carbon Dioxide Microemulsion

Fernández, Carlos A.; Wai, Chien M.

doi:10.1002/smll.200600222

Cited by 22 publications

(21 citation statements)

References 13 publications

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“…[19] This approach gave consistent results in both nanomaterials for two different W values and for two different concentrations of surfactant tested. For the case of ZnS nanoparticles, the variation in the size of the nanoparticles with the density of the solvent (which follows a linear relationship) may not depend on the stage of the synthetic process at which the nanoparticles are stabilized.…”

Section: Resultssupporting

confidence: 65%

“…This study, together with the one reported for silver nanoparticles, [19] have shown, that water-in-supercritical CO 2 microemulsions seem to be effective systems for the tunablesize synthesis of a diversity of nanomaterials by varying the density of the fluid.…”

Section: Resultsmentioning

confidence: 72%

“…[19] We were able to synthesize silver nanoparticles with sizes ranging from 1.9 to 9.3 nm when W = 6 was used and from 5.5 to 13 nm when a higher water-to-surfactant molar ratio (W = 10) was employed.…”

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confidence: 99%

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Continuous Tuning of Cadmium Sulfide and Zinc Sulfide Nanoparticle Size in a Water‐in‐Supercritical Carbon Dioxide Microemulsion

Fernández

Wai

2007

Chemistry A European J

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The size and size dispersion of cadmium sulfide and zinc sulfide semiconductor nanoparticles can be continuously tuned over a wide range of values by adjusting the density of the fluid phase in water-in-supercritical CO2 microemulsions. The average size of the ZnS nanoparticles decreases linearly from approximately 9.1 to 1.9 nm with increasing fluid density from 0.86 to 0.99 g cm(-3) at a water-to-surfactant ratio (W value) of 10. At a W value of 6, the particle size can be tuned from 7.0 to 1.5 nm in the same density range. In the case of CdS nanocrystals, the size varied from 7.1 to 2.0 nm when the W value was 10 and from 4.0 to 1.3 nm when the W value employed was 6, in the same density range. Monodispersive CdS and ZnS nanoparticles were synthesized by chemical reaction of cadmium or zinc nitrate with sodium sulfide, using two water-in-supercritical CO2 microemulsions as nanoreactors followed by protection with a fluorinated-thiol stabilizer. The stabilizer is introduced at 6 and 16 minutes after the mixing of the two microemulsions where the intensity of the characteristic absorption peak due to the quantum confinement properties of the CdS and ZnS nanoparticles (280 and 360 nm) reaches a maximum, respectively. The supercritical CO2 microemulsion method represents a simple approach to use a density-tunable solvent for synthesizing size-controlled semiconductor nanoparticles over a broad range of values.

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 72%

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Continuous Tuning of Cadmium Sulfide and Zinc Sulfide Nanoparticle Size in a Water‐in‐Supercritical Carbon Dioxide Microemulsion

Fernández

Wai

2007

Chemistry A European J

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“…10 The formation of metal nanoparticles (silver, copper, palladium, ... in a range 3-15 nm) was also extensively studied using waterin-scCO 2 microemulsions. 11 An alternative approach has also been reported; a CO 2 carrier solution containing CO 2 -soluble metal precursors is sprayed into a CO 2 receiving solution § containing a reducing agent and a functionalizing agent. 12 This affords silver and palladium nanoparticles (1-15 nm) stabilized with fluorocarbon thiols.…”

Section: Introductionmentioning

confidence: 99%

General Approach for the Synthesis of Organic−Inorganic Hybrid Nanoparticles Mediated by Supercritical CO₂

et al. 2007

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Abstract:We report in this paper novel chemistry that addresses the problem of surfactant solubility in supercritical CO2 for metal nanoparticle synthesis. This new approach for the preparation of organicfunctionalized inorganic nanoparticles relies on the reduction of a metal precursor in a CO2-containing insoluble polymer. Reduction of the metal with H2 leads to small nanocrystals stabilized by the polymer with a relatively small polydispersity. The functionalized metal nanoparticles are recovered as a dry powder, free of any organic solvents, which can then be resuspended in an appropriate solvent. This approach limits the number of steps for the preparation of functional nanoparticles which are ready for use. To illustrate this, we report results of the preparation of palladium and silver nanoparticles of 3-5 nm size stabilized with hyperbranched polyamines, functionalized with perfluoroalkyl, perfluorooligoether, non-fluorinated alkyl, polysiloxane, or polyethylene glycol moieties.

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“…The radius of the water nanoreactor could be tuned in a facile way by changing water/surfactant ratio (W 0 c ) in the composition of microemulsion. Fernandez et al [27] demonstrated that the use of scCO 2 microemulsion as reaction media exhibits additional advantage in continuous tuning of the Ag nanoparticle size. The nanoparticles were prepared in scCO 2 microemulsion with different water/surfactant molar ratios (W 0 c ), that is, different water nanopool dimensions, stabilized with surfactant AOT fluorinated analogue at 10 mM concentration.…”

Section: Synthesis Of Nanoparticles In Scco 2 -Based Microemulsionsmentioning

confidence: 99%

Synthesis and Functionalization of Nanoparticles in Supercritical CO₂

Cinteză¹,

Bala²

2020

Advanced Supercritical Fluids Technologies

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A review of recent results on fabrication of inorganic and organic nanoparticles in supercritical carbon dioxide will be presented, with particular emphasis on the metallic and polymeric nanoparticles used in biomedicine. The use of the water-in-scCO 2 microemulsion in the synthesis of metal nanoparticles will be also discussed. The recent progress in preparation of polymeric nanoparticles with desired size and porosity obtained through processing methods in scCO 2 as drug delivery systems will be described. The efficiency of the drug encapsulation in organic and inorganic nanoparticles using supercritical CO 2 as dissolving media is another topic of interest. Various methods to achieve surface functionalization of nanoparticles in supercritical and subcritical CO 2 will be evaluated, considering the challenges and limitations in efficiency, scalability, and development of new applications.

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Continuous Tuning of Silver Nanoparticle Size in a Water‐in‐Supercritical Carbon Dioxide Microemulsion

Cited by 22 publications

References 13 publications

Continuous Tuning of Cadmium Sulfide and Zinc Sulfide Nanoparticle Size in a Water‐in‐Supercritical Carbon Dioxide Microemulsion

Continuous Tuning of Cadmium Sulfide and Zinc Sulfide Nanoparticle Size in a Water‐in‐Supercritical Carbon Dioxide Microemulsion

General Approach for the Synthesis of Organic−Inorganic Hybrid Nanoparticles Mediated by Supercritical CO₂

Synthesis and Functionalization of Nanoparticles in Supercritical CO₂

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Continuous Tuning of Silver Nanoparticle Size in a Water‐in‐Supercritical Carbon Dioxide Microemulsion

Cited by 22 publications

References 13 publications

Continuous Tuning of Cadmium Sulfide and Zinc Sulfide Nanoparticle Size in a Water‐in‐Supercritical Carbon Dioxide Microemulsion

Continuous Tuning of Cadmium Sulfide and Zinc Sulfide Nanoparticle Size in a Water‐in‐Supercritical Carbon Dioxide Microemulsion

General Approach for the Synthesis of Organic−Inorganic Hybrid Nanoparticles Mediated by Supercritical CO2

Synthesis and Functionalization of Nanoparticles in Supercritical CO2

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Product

Resources

About

General Approach for the Synthesis of Organic−Inorganic Hybrid Nanoparticles Mediated by Supercritical CO₂

Synthesis and Functionalization of Nanoparticles in Supercritical CO₂