Nanoparticles Preparation Using Microemulsion Systems

Zielińska‐Jurek, Anna; Reszczyńska, Joanna; Grabowska, Ewelina; Zaleska, Adriana

doi:10.5772/36183

Cited by 33 publications

(29 citation statements)

References 56 publications

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“…23,[28][29][30][31] Triton-X has been used basically in the preparation of titania by pressurized uid extraction and supercritical drying methods. 4,6,7,[32][33][34][35] Several studies have been published in which reverse micelles have been used in the synthesis of nanoporous materials. In this paper, we present the rst systematic study of the synthesis of porous titanium dioxide with the use of electrically neutral amphiphilic molecules of the so-called Triton-X series forming reverse micelles.…”

Section: 21mentioning

confidence: 99%

“…emulsions and microemulsions) or surfactants and polymers to better control the surface properties and purity of the prepared solids. [22][23][24][25] The variety of emulsions, polymers and surfactants available allows the design of a large number of preparation pathways and the production of TiO 2 materials with controlled textural and surface properties 6,7,22,26 . In addition, the use of surfactants and the formation of titania in micellar compartments favours the stabilization of nanosized TiO 2 particles.…”

Section: 21mentioning

confidence: 99%

“…5 In this context, the preparation of mesoporous TiO 2 materials with a high surface area and controlled pore size is of particular interest. 6 There has been a large number of papers published describing several different synthetic methods for the synthesis of mesoporous TiO 2 materials. 7 These methods include hydrothermal processes, [8][9][10] pyrolysis, 11 thermal decomposition, 12 alkaline precipitation, 13,14 combustion, 15 mechanochemical and electrochemical methods, 16,17 sol-gel methods, 18 gas-phase condensation, 19 microwave and ultrasound techniques.…”

Section: Introductionmentioning

confidence: 99%

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Tuning the porosity and surface characteristics of nanoporous titania using non-ionic surfactant reverse micelles

Paschalidou

Theocharis

2018

RSC Adv.

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Nanoporous titania was prepared from non-ionic surfactant reverse micelles (e.g. Triton-X) and the effects of the chain length of the surfactants and calcination temperature of the precursor gels on the surface properties of the product (mesoporous titania) were investigated. The studies included sample characterization of the precursor gels from the titania samples characterized by UV-Vis, ATR-FTIR, XRD, TGA/DSC and the titania samples by N 2 -adsorption BET, XRD, FT-IR, UV-Vis diffuse reflectance and SEM measurements after calcination at 400 C, 500 C, 600 C, 700 C and 800 C. According to the experimental results, generally increasing the length of the polar tail of Triton-X results in an increased specific surface area and volume, and an average pore diameter of the solids. Moreover, increasing the length of the polar tail is associated with a smaller crystallite size and higher thermal stability of the materials. Finally, a nucleation mechanism of the titania particles within the aqueous centre of the reversed micelles is proposed.

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Section: 21mentioning

confidence: 99%

Section: 21mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tuning the porosity and surface characteristics of nanoporous titania using non-ionic surfactant reverse micelles

Paschalidou

Theocharis

2018

RSC Adv.

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“…Addition of an anti-solvent (e.g. supercritical carbon dioxide, having a relatively low dielectric constant), along with a stabilizing agent such as carboxylate perfluoropolyether surfactant, being an innocuous and cheaper method, can be applied to control the stability of the catalysts effectively [11]. Making use of a photo-destructible surfactant, actuating de-stabilization of nanocatalyst particles from the microemulsion is also an interesting method for this purpose [99].…”

Section: Challenges In Microemulsion Synthesis Of Nanocatalystsmentioning

confidence: 99%

“…Sometimes, a cosurfactant, mostly a medium-chain alcohol, is also used in addition to the surfactant, which enhances the system's stability and entropy by increasing the fluidity and decreasing the interfacial tension between water and oil molecules, thus easing the microemulsion formation [10]. The stability of a microemulsion can also be enhanced by changing the reaction parameters such as pressure, temperature or concentration of reagents or by the addition of a salt [11].…”

Section: Introductionmentioning

confidence: 99%

Microemulsion Route for the Synthesis of Nano-Structured Catalytic Materials

Hussain¹,

Batool²

2017

Properties and Uses of Microemulsions

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Owing to their unique properties, use of microemulsion-based synthetic techniques for the generation of shape-controlled nanocatalyst is an area of great current interest. Nanocatalysts of any specific shape, morphology, surface area, size, geometry, homogeneity and composition are widely being prepared using the soft techniques of microemulsion. Easy handling, inexpensive equipment and mild reaction conditions make microemulsion an attractive reaction medium. Herein, a nanosized precursor reactant can be incorporated, leading to the formulation of a highly monodispersed metal nanoagglomerate with controlled size, shape and composition. Several factors such as presence of electrolyte, molar ratio of water to surfactant, nature and concentration of surfactant and solvent, size of water droplets and concentration of reducing agents influence the size of the nanoparticles. The reverse micelle method can be used for the fabrication of several nanosized catalysts with a diverse variety of suitable materials including silica, alumina, metals (e.g. Au, Pd, Rh, Pt), metal oxides, etc. The morphology, size distribution and shape of the nanocatalysts make them useable for a wide range of applications, for example, fuel cells, electrocatalysis, photocatalysis, environmental protection, etc. The recovery of nanoparticles from the reaction mixture is a challenge for the researchers. This chapter discusses the preparation of nanoparticles using microemulsion techniques, widely being used for the synthesis of nanocatalysts from a wide range of materials.

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