Nanoparticles in Microemulsions: A General Approach

Nagy, J.B.; Barette, D.; Fonseca, A.; Jeunieau, L.; Monnoyer, Ph.; Piedigrosso, P.; Ravet-Bodart, I.; Verfaillie, J.-P.; Wathelet, Alain

doi:10.1007/978-94-015-8771-6_6

Cited by 15 publications

(25 citation statements)

References 37 publications

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“…( B ) Symbols show Au particles prepared in PEDGE-hexane-water (data obtained from reference [59]); line shows simulation results ( f = 5, droplet size = 500).…”

Section: Resultsmentioning

confidence: 99%

“…, two different values of the film flexibility. Symbols in Figure 3 A show the variation of Au particle diameter as a function of precursor AuCl 3 concentration synthesized in DOBANOL-hexane-water microemulsion (data obtained from reference [ 59 ]). One can observed that particles of one size are obtained (unimodal particle size distribution), and size increases with increasing concentration.…”

Section: Resultsmentioning

confidence: 99%

“… Particle size versus reactant concentration: ( A ) Symbols show Au particles prepared in DOBANOL-hexane-water; line shows simulation results ( f = 30, droplet size = 500). ( B ) Symbols show Au particles prepared in PEDGE-hexane-water (data obtained from reference [ 59 ]); line shows simulation results ( f = 5, droplet size = 500). …”

Section: Resultsmentioning

confidence: 99%

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Surfactant Effects on Microemulsion-Based Nanoparticle Synthesis

2010

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The effect of the surfactant on the size, polydispersity, type of size distribution and structure of nanoparticles synthesized in microemulsions has been studied by computer simulation. The model simulates the surfactant by means of two parameters: the intermicellar exchange parameter, kex, related to dimer life time, and film flexibility parameter, f, related to interdroplet channel size. One can conclude that an increase in surfactant flexibility leads to bigger and polydisperse nanoparticle sizes. In addition, at high concentrations, the same reaction gives rise to a unimodal distribution using a flexible surfactant, and a bimodal distribution using a rigid one. In relation to bimetallic nanoparticles, if the nanoparticle is composed of two metals with a moderate difference in reduction potentials, increasing the surfactant flexibility modifies the nanoparticle structure, giving rise to a transition from a nanoalloy (using a rigid film) to a core-shell structure (using a flexible one).

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“…( B ) Symbols show Au particles prepared in PEDGE-hexane-water (data obtained from reference [59]); line shows simulation results ( f = 5, droplet size = 500).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Surfactant Effects on Microemulsion-Based Nanoparticle Synthesis

2010

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“…Numerous physical and chemical methods have been developed for the preparation of magnetic nanoparticles. [7][8][9][10][11][12] Bloomfield et al 13,14 and De Heer et al 15 employed laser ablation methods and prepared magnetic nanoparticles (Co, Ni, Fe) of 40-500 atoms. However, these nanoparticles were not stable in air due to oxidation and aggregation because their surfaces were not passivated by other organic or inorganic molecules (bare nanoparticles).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Surface Derivatization of Processible Co Nanoparticles

2003

Bulletin of the Korean Chemical Society

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Co nanoparticles were prepared by the reverse micelle technique (NaBH 4 reduction of cobalt chloride in a reversed micelle solution of didodecyldimethylammoniumbromide (DDAB)/toluene). The size and the shape of Co nanoparticles could be easily controlled by changing the water contents and micelle concentrations, and the solubility of Co nanoparticles was systematically tuned by choosing appropriate surface capping organic ligand molecules. Furthermore, a novel nanofabrication process was clearly demonstrated, which generated oxide over-coated Co nanorods from Co nanoparticles in organic solution by slow oxidation with an external magnetic field.

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“…13 C NMR spectra of (a) K(Ag4Cl4)(C3H3O3)-LTA and (b) a reference sample with molar ratio 1,3,5-trioxane/methanol/D2O ) 1:1:40.…”

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Single Crystal Structure of Zeolite A (LTA) Containing Ag₄Cl₄Nanoclusters and Reduced 1,3,5-Tripyrylium Dimers with Remarkably Short 2.43 Å Interplanar Spacings

Kim¹,

Thi²,

Heo³

et al. 2008

J. Phys. Chem. C

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A single crystal of Ag 12 -A (zeolite LTA) was prepared by the dynamic ion-exchange of Na 12 -A with aqueous 0.05 M AgNO 3 . It was washed with CH 3 OH and allowed to react with a stream of 0.05 M KCl in CH 3 OH at 294 K. The crystal structure of the product |K 2.35 Ag 1.1 (Ag 4 Cl 4 ) 0.45 (C 3 H 3 O 3 ) 1.1 (K 3 Cl) 3.45 (K 3 (OH) 2 ) 0.55 (H 2 O) g3.0 |-[Si 12 Al 12 O 48 ]-LTA (a ) 12.292(1) Å) was determined by single-crystal X-ray diffraction in the cubic space group Pm3 j m at 294 K. It was refined to the final error index, R 1 ) 0.052, based on the 371 reflections for which F o > 4σ(F o ). Ag 4 Cl 4 nanoclusters were found in about 45% of the sodalite cavities. Each Ag 4 Cl 4 cluster (interpenetrating tetrahedra; symmetry T d , Ag-Cl ) 3.105(17) Å) is held in place by the coordination of each of its four Ag + ions to three oxygens of the zeolite framework (Ag-O ) 2.493(5) Å) and by the coordination of each of its four Cl -ions to a K + ion through a 6-ring (Cl-K ) 2.70(3) Å). In each of the remaining 55% of the sodalite cavities, two reduced planar 1,3,5-tripyrylium cations, [(CH) 3 O 3 ] 2 2+ (C-O ) 1.52(3) Å), are found. These parallel eclipsed rings (symmetry D 3d ) have an interplanar distance of only 2.43 Å due to σ double bonding between the rings, the result of four electrons in 12-center bonding π* orbitals, and to polar attraction. Each ring makes three strong hydrogen bonds (CH · · · O ) 2.84(3) Å) to oxygens of the zeolite framework, and a Ag + ion coordinates to the three oxygens of one ring (Ag-O ) 2.68(9) Å). The large cavities are filled with K + , Cl -, Ag + , OH -, and H 2 O; the K 3 Cl 2+ unit predominates. The 1,3,5-tripyrylium ring, isoelectronic with benzene, had not been reported before.

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Nanoparticles in Microemulsions: A General Approach

Cited by 15 publications

References 37 publications

Surfactant Effects on Microemulsion-Based Nanoparticle Synthesis

Surfactant Effects on Microemulsion-Based Nanoparticle Synthesis

Synthesis and Surface Derivatization of Processible Co Nanoparticles

Single Crystal Structure of Zeolite A (LTA) Containing Ag₄Cl₄Nanoclusters and Reduced 1,3,5-Tripyrylium Dimers with Remarkably Short 2.43 Å Interplanar Spacings

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Nanoparticles in Microemulsions: A General Approach

Cited by 15 publications

References 37 publications

Surfactant Effects on Microemulsion-Based Nanoparticle Synthesis

Surfactant Effects on Microemulsion-Based Nanoparticle Synthesis

Synthesis and Surface Derivatization of Processible Co Nanoparticles

Single Crystal Structure of Zeolite A (LTA) Containing Ag4Cl4Nanoclusters and Reduced 1,3,5-Tripyrylium Dimers with Remarkably Short 2.43 Å Interplanar Spacings

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Product

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About

Single Crystal Structure of Zeolite A (LTA) Containing Ag₄Cl₄Nanoclusters and Reduced 1,3,5-Tripyrylium Dimers with Remarkably Short 2.43 Å Interplanar Spacings