Influence of n-alkyl acids on the percolative phenomena in AOT-based microemulsions

Cid‐Samamed, Antonio; García‐Río, Luis; Fernández-Gándara, D.; Mejuto, J. C.; Morales, Juan J.; Pérez‐Lorenzo, Moisés

doi:10.1016/j.jcis.2007.11.001

Cited by 22 publications

(16 citation statements)

References 51 publications

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“…Varying droplets' radii authors were able to control particle dimension. They reported that the proper selection of microemulsion components would ease the exchange of reagents between the "transition dimers" formed by two droplets of the microemulsions; for this to happen, an important alteration in the local curvature is necessary, so the selection of adequate surfactants that shows a radius of curvature close to their natural radius will facilitate the opening of channels [4][5][6][7][8][9], particle formation, and growth. Once the particles are formed, the surfactant particles act as surface agents, limiting the future growth of the particles.…”

Section: Metal Nanoparticles (Mnps) 21 Anionic Surfactantsmentioning

confidence: 99%

Synthesis of NPs by Microemulsion Method

Cid¹

2018

Microemulsion - A Chemical Nanoreactor [Working Title]

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Microemulsions are self-aggregated colloidal systems that provide a controllable system with a promising application as nanoreactors: they can act as pools within which the properties of the nanoparticles can be controlled without difficulty. So in this chapter, I will deal with the metal NPs synthesized by the microemulsion method. This method allows in some cases to control the properties of size, shape, and crystal structure of the metallic NPs, thus generating with the same reagents a series of seeds of different shapes and sizes. The control of the reaction time, the temperature, and the reaction conditions will give us a production of different geometries that will find different applications in large range of research fields.

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Section: Metal Nanoparticles (Mnps) 21 Anionic Surfactantsmentioning

confidence: 99%

Synthesis of NPs by Microemulsion Method

Cid¹

2018

Microemulsion - A Chemical Nanoreactor [Working Title]

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“…An experimental procedure to determine percolation temperature has been described previously [20][21][22]. A Crison GPL 32 conductivity meter was used.…”

Section: Percolation Temperature Determinationmentioning

confidence: 99%

“…In the last decade, our research group has studied the effects of different additives on the electrical conductivity, and other properties, for water/AOT/isooctane microemulsions (aerosol OT or dioctyl sodium sulfosuccinate, isooctane and water) [5,[15][16][17][18][19][20][21][22]. The influence of different additives was explained on the basis of changes in the surfactant film structure and different solubility of the complex system.…”

Section: Introductionmentioning

confidence: 99%

Influence of Amphiphiles on Percolation of AOT-Based Microemulsions Prediction Using Artificial Neural Networks

Astray¹,

Cid²,

Moldes³

et al. 2017

Properties and Uses of Microemulsions

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In this chapter, the ability of artificial neural networks was evaluated to predict the influence of amphiphiles as additive upon the electrical percolation of dioctyl sodium sulfosuccinate (AOT)/isooctane/water microemulsions. In particular, water/AOT/isooctane microemulsion behaviour has been modelled. These microemulsions have been developed in presence of 1-n-alcohols, 2-n-alcohols, n-alkylamines and n-alkyl acids. In all cases, a neural network has been obtained to predict with accuracy the experimental behaviour to identify the physico-chemical variables (such as additive concentration, molecular mass, log P, pK a or chain length) that exert a greater influence on the model. All models are valuable tools to evaluate the percolation temperature for AOT-based microemulsions.

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“…Partial replacement of AOT by DEHPA in AOT-heptane-water microemulsion reduces the temperature of temperature-induced percolation [20]. Introduction of n-alkyl acids, especially medium and long chain acids (C 4 -C 23 ), into AOT-based microemulsion in isooctane leads to an increase in the temperature of percolation [22].…”

Section: Electrical Conductivitymentioning

confidence: 99%

Effect of Bis‐(2‐ethylhexyl)Phosphoric Acid on Sodium Bis‐(2‐ethylhexyl)Phosphate Microemulsion for Selective Extraction of Non‐Ferrous Metals

Мурашова

Levchishin

Yurtov

2014

J Surfact & Detergents

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The effect of bis‐(2‐ethylhexyl)phosphoric acid (DEHPA) on the region of existence, conductivity and structure of sodium bis‐(2‐ethylhexyl)phosphate (NaDEHP) microemulsion has a dual nature and depends on DEHPA concentration. In the system NaDEHP–DEHPA–kerosene–water, the narrowing of the microemulsion region is observed with DEHPA concentration in the organic phase growth from 0.1 to 0.5 mol/L. The increase of DEHPA concentration in the organic phase from 0.1 to 0.4 mol/L leads to the reduction of electrical conductivity of the microemulsions. Based on the conductivity and viscosity measurements, we suppose the transition from reverse microemulsion with isolated droplets to percolate microemulsion at volume fraction of water 0.18 ( W=CH2O/CNaDEHP = 8). Droplet size of the microemulsions increases linearly with W growth. The rise of DEHPA concentration in the organic phase from 0.1 to 0.3 mol/L causes the growth of the coefficient at W in the equation d = kW + b from 0.038 to 0.249, i.e., it increases the slope of the lines. In contrast, DEHPA introduction at the concentration 0.1 mol/L (in the organic phase) leads to the expansion of the microemulsion region, does not affect the conductivity and decreases the coefficient at W. The rate of copper recovery into the microemulsion increases considerably with the rise of DEHPA concentration from 0.0 to 0.3 mol/L; no dual effect is observed. The following composition of the microemulsion for non‐ferrous metals leaching is recommended: CNaDEHP = 1.6 mol/L, CDEHPA = 0.3 mol/L (in the organic phase); W = 8–32.

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Influence of n-alkyl acids on the percolative phenomena in AOT-based microemulsions

Cited by 22 publications

References 51 publications

Synthesis of NPs by Microemulsion Method

Synthesis of NPs by Microemulsion Method

Influence of Amphiphiles on Percolation of AOT-Based Microemulsions Prediction Using Artificial Neural Networks

Effect of Bis‐(2‐ethylhexyl)Phosphoric Acid on Sodium Bis‐(2‐ethylhexyl)Phosphate Microemulsion for Selective Extraction of Non‐Ferrous Metals

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