Microemulsions as templates for the synthesis of metallic nanoparticles

Wielpütz, Thomas; Sottmann, Thomas; Roychowdhury, Chandrani; DiSalvo, Francis J.

doi:10.1016/j.colsurfa.2007.10.031

Cited by 59 publications

(42 citation statements)

References 47 publications

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“…In our previous study we indeed adjusted changes of the phase boundaries caused by adding the different salts. However, we did not determine the location of the complete wefb but rather the location of one point on the wefb [28]. With the present study we want to fill this gap.…”

Section: Introductionmentioning

confidence: 89%

“…In the present study all measurements were carried out at constant temperature and the amount of co-surfactant (1-butanol) was changed to locate the water emulsification failure boundary (wefb) of the microemulsion that contained the metal salt(s) and the reducing agent, respectively. The starting point for the study was the base system H 2 O/salt -n-decane -SDS -1-butanol [28] the wefb is shifted towards lower water and 1-butanol contents with increasing molar concentration of the electrolyte. We will come back to this point in section 4.…”

Section: Phase Diagrams Of the Base Microemulsion Systemsmentioning

confidence: 99%

“…at room temperature) is the use of water-in-oil (w/o) microemulsions. Using microemulsions instead of the above mentioned solvochemical reduction techniques allows us to synthesize nanoparticles of low polydispersity and tuneable size [26][27][28]. Microemulsions are thermodynamically stable mixtures of at least three components, namely, water, oil, and a surfactant with domain sizes of 5 -50 nm [29].…”

Section: Introductionmentioning

confidence: 99%

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

Najjar

2009

Journal of Colloid and Interface Science

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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 H 2 O/salt -n-decane -SDS -1-butanol. The salt was either one metal precursor (H 2 PtCl 6 ·6H 2 O, Pb(NO 3 ) 2 , or Bi(NO 3 ) 3 ·5H 2 O), a mixture of two metal precursors (H 2 PtCl 6 ·6H 2 O + Pb(NO 3 ) 2 or H 2 PtCl 6 ·6H 2 O + Bi(NO 3 ) 3 ·5H 2 O), or the reducing agent (NaBH 4 ). 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.

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Section: Introductionmentioning

confidence: 89%

Section: Phase Diagrams Of the Base Microemulsion Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Najjar

2009

Journal of Colloid and Interface Science

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“…[18,33,40,41] Stubenrauch et al [18,41] studied in detail the phase behaviour of the system H 2 O/metal salt(s) -n-decane -SDS/1-butanol. The focus was on the determination of the water emulsification failure boundary (wefb) along which the aqueous phase forms spherical droplets over a large concentration range.…”

Section: Introductionmentioning

confidence: 99%

“…In some systems the resulting particles were found to be of the same size, while in other systems they were much larger than the water droplets. [17,18] The presence of more than one metal in the metallic nanoparticles is of particular interest since the physical and chemical interactions between different atoms can lead to new properties. For example, it turned out that combining a transition metal with platinum enhances the catalytic activities for reactions such as oxygen reduction in fuel cells and direct oxidation of methanol as compared to the pure Pt catalyst.…”

Section: Introductionmentioning

confidence: 99%