Preparation of nanoparticles of silver halides, superconductors and magnetic materials using water-in-oil microemulsions as nano-reactors

Pillai, V.; Kumar, Purushottam; Hou, M.J; Ayyub, P.; Shah, Dinesh O.

doi:10.1016/0001-8686(94)00227-4

Cited by 250 publications

(135 citation statements)

References 123 publications

Supporting

Mentioning

121

Contrasting

Unclassified

Order By: Relevance

“…Strategies typically involve enclosing "nanodroplets" of aqueous iron salts in a surfactant coat that separates them from the surrounding organic solution (e.g., AOT in isooctane); to form reverse micelles. 29,113,132 To this, alkaline nanodroplets are added. The SPIO are precipitated and oxidized within the nanosized micelle.…”

Section: Microemulsionmentioning

confidence: 99%

Superparamagnetic Iron Oxide Nanoparticle Probes for Molecular Imaging

et al. 2006

View full text Add to dashboard Cite

Abstract-The field of molecular imaging has recently seen rapid advances in the development of novel contrast agents and the implementation of insightful approaches to monitor biological processes non-invasively. In particular, superparamagnetic iron oxide nanoparticles (SPIO) have demonstrated their utility as an important tool for enhancing magnetic resonance contrast, allowing researchers to monitor not only anatomical changes, but physiological and molecular changes as well. Applications have ranged from detecting inflammatory diseases via the accumulation of non-targeted SPIO in infiltrating macrophages to the specific identification of cell surface markers expressed on tumors. In this article, we attempt to illustrate the broad utility of SPIO in molecular imaging, including some of the recent developments, such as the transformation of SPIO into an activatable probe termed the magnetic relaxation switch.

show abstract

Section: Microemulsionmentioning

confidence: 99%

Superparamagnetic Iron Oxide Nanoparticle Probes for Molecular Imaging

et al. 2006

View full text Add to dashboard Cite

show abstract

“…Several methods were recently proposed to isolate the nanoparticles from the reverse microemulsion without their aggregation. Hydrocarbon evaporation (173,174) or freezedrying/sublimation (175) did not allow elimination of surfactant molecules, whereas cross-flow ultrafiltration (176) resulted in a concentrated nanoparticle suspension. Another method involved the hydrocarbon evaporation in vacuum at 50uC, followed by the surfactant dissolution in methanol with the simultaneous flocculation of Pd nanoparticles, which could be isolated by centrifugation (Fig.…”

Section: Unsupported Nanoparticlesmentioning

confidence: 99%

Recent Advances in the Liquid‐Phase Synthesis of Metal Nanostructures with Controlled Shape and Size for Catalysis

2009

View full text Add to dashboard Cite

“…Among these, the reverse microemulsion (ME) technique is of special interest. Reversed (water-in-oil) MEs are thermodynamically stable, optically isotropic dispersions of water and oil consisting of nanosized domains of water in oil, stabilized by an interfacial film of surface active molecules [11]. The water droplets can be considered spatially confined nanoreactors of 5-100 nm for the formation of monodispersed particles with a standard deviation less than ±10%.…”

Section: Introductionmentioning

confidence: 99%

“…Several attempts have been made to purify nanoparticles from the ME components. Hydrocarbon evaporation [11,28] or freezedrying/sublimation [29] did not allow elimination of surfactant molecules, whereas cross-flow ultrafiltration [30] resulted in concentrated nanoparticle suspension. Nanoparticles also may be deposited onto solid support by mixing the ME with a support.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of monodispersed palladium nanoparticles to study structure sensitivity of solvent-free selective hydrogenation of 2-methyl-3-butyn-2-ol

Semagina

Renken

Laub

et al. 2007

Journal of Catalysis

112

View full text Add to dashboard Cite

A novel method for isolation of monodispersed Pd nanoparticles from a reverse microemulsion was developed using hydrocarbon evaporation and methanol-assisted particle purification from a surfactant. Fcc Pd nanoparticles of 6, 8, 11, and 13 nm in diameter were isolated from water/ AOT/isooctane mixture and used to study a size effect during solvent-free hydrogenation of 2-methyl-3-butyn-2-ol to 2-methyl-3-buten-2-ol. The initial TOF calculated per mole of surface palladium atoms was duplicated when particle size was increased from 6 to 13 nm but remained constant when accounted per number of specific Pd atoms on Pd(111) facets. Selectivity to olefinic alcohol was not size-dependent, but an increase in particle size decreased the byproduct ratio of dimers to saturated alcohol. Acetylenic alcohol hydrogenation is shown to be a structure-sensitive but size-independent reaction for Pd particles with size of 6-13 nm. The work shows also that the Pd size controlled the reaction rate and the byproduct distribution.

show abstract

Preparation of nanoparticles of silver halides, superconductors and magnetic materials using water-in-oil microemulsions as nano-reactors

Cited by 250 publications

References 123 publications

Superparamagnetic Iron Oxide Nanoparticle Probes for Molecular Imaging

Superparamagnetic Iron Oxide Nanoparticle Probes for Molecular Imaging

Recent Advances in the Liquid‐Phase Synthesis of Metal Nanostructures with Controlled Shape and Size for Catalysis

Synthesis of monodispersed palladium nanoparticles to study structure sensitivity of solvent-free selective hydrogenation of 2-methyl-3-butyn-2-ol

Contact Info

Product

Resources

About