Physico-Chemical Characterization of Microemulsions: Preparation of Monodisperse Colloidal Metal Boride Particles

Nagy, J.B.; Derouane, Éric G.; Gourgue, A.; Lufimpadio, N.; Ravet, Isabelle; Verfaillie, J.-P.

doi:10.1007/978-1-4615-7990-8_1

Cited by 14 publications

(19 citation statements)

References 127 publications

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“…For such a high CTAB concentration, there are enough surfactants to solubilize the aqueous solution even with high metallic ion concentration. Meanwhile, more hexanol molecules may assemble in the surfactant film because they would be required to complex with zirconium ions, as there is not enough water molecules to hydrate the metal ions with so high a concentration (12). It may result in a stiff film and a strong repulsion between reverse micelles.…”

Section: Resultsmentioning

confidence: 99%

“…AOT was often used to form reverse micelles with apolar solvents for the preparation of nanoparticles due to its high water uptake and ideal nanoparticles have been produced from AOT reverse micellar systems (1, 24 -26). In recent years, more and more work uses CTAB as surfactant instead (12). The reason is that the CTAB reverse micellar systems show remarkably more solubilization capacity of high concentration aqueous salt solutions than AOT-based systems (27).…”

Section: Introductionmentioning

confidence: 99%

“…Research on the preparation of nanoparticles using reverse micelles was frequently reported (12,(22)(23)(24)(25)(26)(27)(28)(29)(30). The basic idea is that the ideal size and shape of reverse micelles should act as a template for the particles prepared.…”

Section: Introductionmentioning

confidence: 99%

“…Such thermodynamically stable systems have been called water in oil (w/o) microemulsions or reverse micelles. Due to their importance in various technological applications, such as the enhancement of oil recovery, preparation of pharmaceuticals, cosmetics, and monodispersed nanoparticles, more and more studies from both theoretical and experimental aspects have been carried out to provide a better understanding of the physical and chemical properties of reverse micelles (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). The microstructure, structure transition, phase behavior, and water uptake of reverse micelles have been extensively studied (2, 4, 10 -16).…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study on the Relationship between the Physical Properties of CTAB/Hexanol/Water Reverse Micelles and ZrO2–Y2O3Nanoparticles Prepared

Fang

Yang

1999

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Experimental Study on the Relationship between the Physical Properties of CTAB/Hexanol/Water Reverse Micelles and ZrO2–Y2O3Nanoparticles Prepared

Fang

Yang

1999

Journal of Colloid and Interface Science

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“…The synthesis of metal particles with a narrow size distribution in a liquid phase has been reported using w/o microemulsions [22,23].…”

Section: Introductionmentioning

confidence: 99%

Preparation for Pt-Loaded Zeolite Catalysts Using w/o Microemulsion and Their Hydrocracking Behaviors on Fischer-Tropsch Product

et al. 2015

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Pt-loaded β-type zeolite catalysts with constant Pt content (0.11 wt.%) and similar pore structure were prepared using a water-in-oil (w/o) microemulsion. The effect of Pt particle synthesis conditions using microemulsion (a type of Pt complex-forming agents and the molar ratio of complex-forming agent to Pt 4+ ) on loaded Pt particle size was investigated. The Pt particle size of the Pt catalyst using tetraethylammonium chloride (TEAC) as a complex-forming agent with the molar TEAC/Pt ratio 10 was the minimum value (3.8 nm), and was much smaller than that (6.7 nm) prepared by the impregnation method. The utilization of the complex-forming agent of which hydrophobic groups occupied a small volume and the appropriate complex-forming agent/Pt ratio were favorable for synthesis of small Pt particles. The effect of loaded Pt particle size on the hydrocracking of the Fischer-Tropsch (FT) product was investigated using the Pt-loaded zeolite catalysts at 250 °C with an initial H2 pressure of 0.5 MPa, and reaction time of 1 h. The Pt catalyst with a Pt particle size of 4.2 nm prepared using the microemulsion exhibited the maximum corresponding jet fuel yield (30.0%), which was higher than that of the impregnated catalyst.

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Kinetics of silica particle formation in nonionic W/O microemulsions from TEOS

Chang

Fogler

1996

AIChE Journal

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The kinetics of silica particle formation by the ammonia-catalyzed hydrolysis of tetraethyl orthosilicate (TEOS) in water-in-oil (W/O) microemulsions containing a nonionic suflactant was investigated using Fourier-transform infrared spectroscopy, transmission electron microscopy, and light-scattering techniques. The results show that TEOS hydrolysis and silica-particle growth occur at the same rate, indicating the growth of silica particles is rate-controlled by the hydrolysis of TEOS. The rate of TEOS hydrolysis in microemulsions is first order with respect to the concentration of aqueous ammonia (29 wt. % NHJ, but depends weakly on the concentration of water. Based on the fact that TEOS hydrolysis follows a nucleophilic (S,2) substitution of the TEOS's ethoxy group with hydroxyl ion, the kinetic data suggest that both water and ammonia remain predominately in W/O microemulsion droplets. The rate of TEOS hydrolysis also depends on the suflactant concentration that controls the molecular contact between hydroxyl ions and TEOS in the solution. Due to the reaction-controlled growth mechanism, the silica-particle size distribution retains virtually the same shape over the growth period. The final average size of silica particles can be vaned from 26 to 43 nm by adjusting concentrations of water and surfactant. Increasing the water Concentration decreases the average size and uniformity of silica particles. For a given water concentration, the smallest and most uniform silica particles are produced at intermediate water-to-surfactant molar ratios (about 1.9). The results are discussed in terms of the effect of water concentration on the stability of the hydrolyzed silica reacting species during the nucleation of particles and of the water-to-surfactant molar ratio on the compartmentalization of silica species in microemulsions.

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Physico-Chemical Characterization of Microemulsions: Preparation of Monodisperse Colloidal Metal Boride Particles

Cited by 14 publications

References 127 publications

An Experimental Study on the Relationship between the Physical Properties of CTAB/Hexanol/Water Reverse Micelles and ZrO2–Y2O3Nanoparticles Prepared

An Experimental Study on the Relationship between the Physical Properties of CTAB/Hexanol/Water Reverse Micelles and ZrO2–Y2O3Nanoparticles Prepared

Preparation for Pt-Loaded Zeolite Catalysts Using w/o Microemulsion and Their Hydrocracking Behaviors on Fischer-Tropsch Product

Kinetics of silica particle formation in nonionic W/O microemulsions from TEOS

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