Nanoparticle formation in rapid expansion of water-in-supercritical carbon dioxide microemulsion into liquid solution

Mohammed J. Meziani; Pankaj Pathak; Frank Beacham; Lawrence F. Allard; Ya Ping Sun

doi:10.1016/j.supflu.2004.10.005

Nanoparticle formation in rapid expansion of water-in-supercritical carbon dioxide microemulsion into liquid solution

Mohammed J. Meziani, Pankaj Pathak, Frank Beacham, Lawrence F. Allard, Ya Ping Sun

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

Silver nanoparticles were produced in the Rapid Expansion of a Supercritical Solution into a Liquid SOLVent (RESOLV). Perfluorinated surfactant-stabilized water-in-CO₂ microemulsion was used to dissolve silver salt for the rapid expansion. It was found that well-behaved nanocrystalline silver particles could be obtained when the reductive solution at the receiving end of the rapid expansion was adjusted to be highly basic. The results suggest that the pre-expansion reverse micelles in the microemulsion might be playing a significant role in the formation of the nanoparticles and that such a role could be affected by the basicity of the receiving solution in RESOLV. The apparent correlation between the parameters of the pre-expansion microemulsion and the properties of the produced nanoparticles is discussed.

Original language	English
Pages (from-to)	91-97
Number of pages	7
Journal	Journal of Supercritical Fluids
Volume	34
Issue number	1
DOIs	https://doi.org/10.1016/j.supflu.2004.10.005
State	Published - May 2005
Externally published	Yes

Funding

Financial support from DOE (DE-FG02-00ER45859) and NSF through the Center for Advanced Engineering Fibers and Films (EEC-9731680) and the EPSCoR program (EPS-0132573) is gratefully acknowledged. F.B. was a participant of the Summer Undergraduate Research Program sponsored jointly by NSF and Clemson University. We also thank the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the HTML User Program, managed by UT-Battelle LLC for DOE (DE-AC05-00OR22725).

Funders	Funder number
Center for Advanced Engineering Fibers and Films	EEC-9731680
EPSCoR program	EPS-0132573
National Science Foundation
U.S. Department of Energy	DE-FG02-00ER45859
Clemson University

Keywords

RESOLV
Silver nanoparticles
Water-in-CO microemulsion

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10.1016/j.supflu.2004.10.005

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abstract = "Silver nanoparticles were produced in the Rapid Expansion of a Supercritical Solution into a Liquid SOLVent (RESOLV). Perfluorinated surfactant-stabilized water-in-CO2 microemulsion was used to dissolve silver salt for the rapid expansion. It was found that well-behaved nanocrystalline silver particles could be obtained when the reductive solution at the receiving end of the rapid expansion was adjusted to be highly basic. The results suggest that the pre-expansion reverse micelles in the microemulsion might be playing a significant role in the formation of the nanoparticles and that such a role could be affected by the basicity of the receiving solution in RESOLV. The apparent correlation between the parameters of the pre-expansion microemulsion and the properties of the produced nanoparticles is discussed.",

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AU - Meziani, Mohammed J.

AU - Pathak, Pankaj

AU - Beacham, Frank

AU - Allard, Lawrence F.

AU - Sun, Ya Ping

PY - 2005/5

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AB - Silver nanoparticles were produced in the Rapid Expansion of a Supercritical Solution into a Liquid SOLVent (RESOLV). Perfluorinated surfactant-stabilized water-in-CO2 microemulsion was used to dissolve silver salt for the rapid expansion. It was found that well-behaved nanocrystalline silver particles could be obtained when the reductive solution at the receiving end of the rapid expansion was adjusted to be highly basic. The results suggest that the pre-expansion reverse micelles in the microemulsion might be playing a significant role in the formation of the nanoparticles and that such a role could be affected by the basicity of the receiving solution in RESOLV. The apparent correlation between the parameters of the pre-expansion microemulsion and the properties of the produced nanoparticles is discussed.

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Nanoparticle formation in rapid expansion of water-in-supercritical carbon dioxide microemulsion into liquid solution

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Keywords

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