Relation between electrical percolation and rate constant for exchange of material between droplets in water in oil microemulsions

Jada, Amane; Láng, J.; Zana, R.

doi:10.1021/j100338a004

Cited by 189 publications

(145 citation statements)

References 1 publication

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“…[20] By using n-heptane, n-octane, and ndecane as continuous media, Moulik and co-workers found the percolation temperature to decrease with increasing length of the alkyl chain in the hydrocarbon. In earlier reports, [21][22][23][24] the strong attractive interaction between drop- The kinetic effects of the microemulsion composition on the solvolysis of anisoyl chloride were studied, and the reagent was found to react with water at the microemulsion interface alone. Based on both kinetic and NMR results, the solvolysis rate constants of anisoyl chloride decrease with increasing penetration of the oil into the interface.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Oil on the Properties of Microemulsions as Reaction Media

2006

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The influence of the nature of the continuous medium on various properties of a wide range of water‐in‐oil (w/o) microemulsions was examined. 1H NMR spectroscopy allowed to determine the properties of water in the studied systems and the way they are affected by the solvent to be elucidated. Changes in interfacial polarity were examined from the 13C NMR signals of the surfactant molecule sodium bis(2‐ethylhexyl)sulfosuccinate (AOT). Chemical shifts were found to vary with the water content of the microemulsion. The variation of the carbon chemical shift as a function of the water‐to‐surfactant concentration ratio (W) was used as an indirect measure of polarity changes at the microemulsion interface. The kinetic effects of the microemulsion composition on the solvolysis of anisoyl chloride were studied, and the reagent was found to react with water at the microemulsion interface alone. Based on both kinetic and NMR results, the solvolysis rate constants of anisoyl chloride decrease with increasing penetration of the oil into the interface. Also, the resonance signals for the water H atoms were found to change in parallel with the solvolysis rate constant for anisoyl chloride. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

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Section: Introductionmentioning

confidence: 99%

Influence of the Oil on the Properties of Microemulsions as Reaction Media

2006

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“…Relationship between electrical percolation and constant rates was demonstrated by Lang and co-workers [7][8][9], and they showed that the exchange of materials between droplets has influence on the rate of fast chemical reactions in w/o microemulsions [5]. Mathew et al [10] observed that percolation threshold is altered by small additives concentrations such as cholesterol or gramicidin [5].…”

Section: Introductionmentioning

confidence: 96%

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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“…Hence, the water droplet is also called a microreactor 22 and has been used for the chemical preparation of relatively monodispersed nanoparticles of various inorganic materials. [23][24] The main goal of this research was to take advantage of the good dispersion of such microreactors in an oily phase to synthesize the nanoparticles of calcium carbonate (CaCO 3 ) with methyl methacrylate (MMA) as the oil phase rather than as a nonreactive solvent and to polymerize MMA in the presence of nano-CaCO 3 as nanofillers. The advantage of this methodology for preparation of polymer/nano-inorganic hybrids is to simplify the process of modifying inorganic nanoparticles with organic materials and to disperse these nanoparticles into the precursors.…”

Section: Introductionmentioning

confidence: 99%

The effects of polymer‐nanofiller interactions on the dynamical mechanical properties of PMMA/CaCO₃ composites prepared by microemulsion template

Qiang

Chunfang

JianZun

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:We prepared novel poly(methyl methacrylate) (PMMA)/CaCO 3 nanocomposites by using reverse micelle as a template. The nanoparticles of CaCO 3 were prepared by the reverse microemulsion with functional monomer, methyl methacrylate (MMA) as oily phase, and the PMMA/CaCO 3 nanocomposite was obtained via polymerization of MMA monomer. The SEM image showed that the nanoparticles of CaCO 3 were dispersed in the polymer matrix. Dynamic mechanical analysis (DMTA) was performed to investigate the interaction between the nanoparticles and the polymer chains. In the low-temperature ripening process, two tan ␦ peaks were observed in the nanocomposite, corresponding to the glass transitions of the matrix and the interface layer. In the high-temperature ripening process, only one tan ␦ peak was observed, suggesting that the interface layer forms a continuous phase. The nanoparticles behave as a physical crosslinker in the interface layer. Modification of the surface of nanoparticles with polyacrylamide and poly(N,NЈ-methylenedisacrylamide) in the nanocomposite did not show an appreciable effect on the interaction of nanoparticles with the matrix. Upon removal of the aqueous phase around the nanoparticles, we obtained surfacecapped nanoparticles by using an improved reverse microemulsion technique. Another PMMA/CaCO 3 nanocomposite was also obtained with these modified nanoparticles. DMTA analysis of this nanocomposite demonstrated that the aqueous phase layer around the nanoparticles does not significantly affect the interaction between the nanoparticles and the polymer chains.

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Relation between electrical percolation and rate constant for exchange of material between droplets in water in oil microemulsions

Cited by 189 publications

References 1 publication

Influence of the Oil on the Properties of Microemulsions as Reaction Media

Influence of the Oil on the Properties of Microemulsions as Reaction Media

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

The effects of polymer‐nanofiller interactions on the dynamical mechanical properties of PMMA/CaCO₃ composites prepared by microemulsion template

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Relation between electrical percolation and rate constant for exchange of material between droplets in water in oil microemulsions

Cited by 189 publications

References 1 publication

Influence of the Oil on the Properties of Microemulsions as Reaction Media

Influence of the Oil on the Properties of Microemulsions as Reaction Media

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

The effects of polymer‐nanofiller interactions on the dynamical mechanical properties of PMMA/CaCO3 composites prepared by microemulsion template

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The effects of polymer‐nanofiller interactions on the dynamical mechanical properties of PMMA/CaCO₃ composites prepared by microemulsion template