Phase diagrams of non-ionic microemulsions containing reducing agents and metal salts as bases for the synthesis of bimetallic nanoparticles

Magno, Miguel; Angelescu, Daniel G.

doi:10.1016/j.colsurfa.2009.07.002

Cited by 21 publications

(19 citation statements)

References 55 publications

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“…The nanoparticles were prepared following the procedure developed by Magno et al [13,14,34]. First, the metal salts were solubilized in water at the concentrations given in Table 4.…”

Section: Nanoparticle Synthesismentioning

confidence: 99%

Catalytic Activity of Mono- and Bi-Metallic Nanoparticles Synthesized via Microemulsions

et al. 2014

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Water-in-oil (w/o) microemulsions were used as a template for the synthesis of mono-and bi-metallic nanoparticles. For that purpose, w/o-microemulsions containing H 2 PtCl 6 , H 2 PtCl 6 + Pb(NO 3 ) 2 and H 2 PtCl 6 + Bi(NO) 3 , respectively, were mixed with a w/o-microemulsion containing the reducing agent, NaBH 4 . The results revealed that it is possible to synthesize Pt, PtPb and PtBi nanoparticles of ~3-8 nm in diameter at temperatures of about 30°C. The catalytic properties of the bimetallic PtBi and PtPb nanoparticles were studied and compared with monometallic platinum nanoparticles. Firstly, the electrochemical oxidation of formic acid to carbon monoxide was investigated, and it was found that the resistance of the PtBi and PtPb nanoparticles against the catalyst-poisoning carbon monoxide was significantly higher compared to the Pt nanoparticles. Secondly, investigating the reduction of 4-nitrophenol to 4-aminophenol,we found that the bimetallic NPs are most active at 23 °C, while the order of the activity changes at higher temperatures, i.e., that the Pt nanoparticles are the most active ones at 36 and 49 °C. Furthermore, we observed a strong influence of the support, which was either a polymer or Al 2 O 3 . Thirdly, for the hydrogenation of allylbenzene to propylbenzene, the monometallic Pt NPs turned out to be the most active catalysts, followed by the PtPb and PtBi NPs. Comparing the two bimetallic nanoparticles, one sees that the PtPb NPs are significantly more active than the respective PtBi NPs. OPEN ACCESSCatalysts 2014, 4 257

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“…The nanoparticles were prepared following the procedure developed by Magno et al [13,14,34]. First, the metal salts were solubilized in water at the concentrations given in Table 4.…”

Section: Nanoparticle Synthesismentioning

confidence: 99%

Catalytic Activity of Mono- and Bi-Metallic Nanoparticles Synthesized via Microemulsions

et al. 2014

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“…Recently, Stubenrauch et al (Magno et al, 2009) and Sanchez-Dominguez et al (Aubery et al, 2011) have reported systematic studies on the effects of addition of reactants to nonionic microemulsion systems. It was shown (Magno et al, 2009) that, depending on the aqueous nature of nonionic microemulsion systems, and the salting-in or salting-out effect of the additives, both increase or decrease on the water solubilization could be obtained.…”

Section: Effect Of Precursor Salts and Additives On The Phase Behaviormentioning

confidence: 99%

“…It was shown (Magno et al, 2009) that, depending on the aqueous nature of nonionic microemulsion systems, and the salting-in or salting-out effect of the additives, both increase or decrease on the water solubilization could be obtained. The same group studied the effects of different salts on the water solubilization of ionic microemulsions of the system aqueous phase / AOT/butanol /decane (Stubenrauch et al, 2008).…”

Section: Effect Of Precursor Salts and Additives On The Phase Behaviormentioning

confidence: 99%

New Trends on the Synthesis of Inorganic Nanoparticles Using Microemulsions as Confined Reaction Media

Sánchez-Domínguez¹,

Aubery²,

Solans³

2012

Smart Nanoparticles Technology

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“…To gain control over the size of the nanoparticles, however, one has to systematically study the phase behavior of the microemulsions. Magno et al were the first to present a systematic study of (a) the phase behavior of the microemulsions, (b) the size of the microemulsion droplets and (c) the respective nanoparticle size [2][3][4][5]. In fact, the use of w/o microemulsions for the synthesis of monoand bimetallic nanoparticles has been studied quite extensively [1,3,4,[6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 97%

Nanoparticles via Oil-in-Water Microemulsions: a Solvent-Reduced, Energy-Efficient Approach

König

Schlick

Sigle

2014

Zeitschrift Für Physikalische Chemie

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This paper deals with the synthesis of Pt and Pt/Pb nanoparticles via oil-in-water microemulsions. Studying systematically the phase behavior of microemulsions which contain metal precursors, it was possible to determine the influence of the metal precursors on the phase behavior of the base microemulsion. It was found that the addition of Pb(ethylhexanoate) 2 to the microemulsion shifts the phase boundaries to slightly lower temperatures, while adding dimethyl-(cyclooctadiene) platinum has no effect on the phase boundaries. SAXS measurements confirmed that the addition of the metal precursors does not influence the size of the microemulsion droplets along the emulsification failure boundary. Using transmission electron microscopy (TEM) we found that by increasing the oil content B in the microemulsion from 0.04 to 0.08 the size of the resulting mono-and bimetallic Pt and Pt/Pb nanoparticles changes from 3 to 4.4 nm.

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Phase diagrams of non-ionic microemulsions containing reducing agents and metal salts as bases for the synthesis of bimetallic nanoparticles

Abstract: Publication informationColloids )

Cited by 21 publications

References 55 publications

Catalytic Activity of Mono- and Bi-Metallic Nanoparticles Synthesized via Microemulsions

Catalytic Activity of Mono- and Bi-Metallic Nanoparticles Synthesized via Microemulsions

New Trends on the Synthesis of Inorganic Nanoparticles Using Microemulsions as Confined Reaction Media

Nanoparticles via Oil-in-Water Microemulsions: a Solvent-Reduced, Energy-Efficient Approach

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