Phase diagrams of microemulsions containing reducing agents and metal salts as bases for the synthesis of metallic nanoparticles

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Title: Phase diagrams of microemulsions containing reducing agents and metal salts as bases for the synthesis of metallic nanoparticles
Authors: Najjar, Reza
Stubenrauch, Cosima
Permanent link: http://hdl.handle.net/10197/2710
Date: 21-Nov-2008
Abstract: We studied the phase diagrams of microemulsions with a view to using these systems for the synthesis of metallic Pt, Pb, and Bi nanoparticles as well as of intermetallic Pt/Pb and Pt/Bi nanoparticles. The microemulsions consisted of H2O/salt – n-decane – SDS – 1-butanol. The salt was either one metal precursor (H2PtCl6·6H2O, Pb(NO3)2, or Bi(NO3)3·5H2O), a mixture of two metal precursors (H2PtCl6·6H2O + Pb(NO3)2 or H2PtCl6·6H2O + Bi(NO3)3·5H2O), or the reducing agent (NaBH4). In addition, other salts needed to be added in order to solubilize the metal precursors, to stabilize the reducing agent, and to adjust the ionic strength. Combining the microemulsion (μe1) that contains the metal precursor(s) with the microemulsion (μe2) that contains the reducing agent leads to metallic nanoparticles. To study systematically how the shape and size of the synthesized metallic nanoparticles depend on the size and shape of the respective microemulsion droplets, first of all one has to find those conditions under which μe1 and μe2 have the same structure. For that purpose we determined the water emulsification failure boundary (wefb) of each microemulsion as it is at the wefb where the water droplets are known to be spherical. We found that the ionic strength (I) of the aqueous phase as well as the hard acid and hard base properties of the ions are the key tuning parameters for the location of the wefb.
Funding Details: Other funder
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2008 Elsevier Inc.
Keywords: Water emulsification failure boundaryw/o-microemulsionsNanoreactorsMetallic nanoparticles
Subject LCSH: Phase diagrams
Emulsions
Nanoparticles
DOI: 10.1016/j.jcis.2008.11.035
Language: en
Status of Item: Peer reviewed
Appears in Collections:Solar Energy Conversion (SEC) Cluster Research Collection
CSCB Research Collection

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