Studies on formation and percolation in ionic liquids/TX-100/water microemulsions

Łuczak, Justyna; Hupka, Jan

doi:10.1016/j.molliq.2014.08.028

Cited by 15 publications

(13 citation statements)

References 57 publications

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“…Nevertheless, some recent researches unveiled that the value of t may deviate significantly and be within 0.10-0.30 40 52 On the other hand, fitting of the data in equation (4) gives the value of t, although for the conductance percolation only, over 1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 16 highest probability of the particles to be found, are near 10 nm.…”

Section: Resultsmentioning

confidence: 99%

“…The values of s and t, according to third degree polynomial fitting, have been 1.08 and 0.49, but the value for t optimized from fourth degree polynomial fitting has been 0.92. The pre-percolation exponent s is suggested to be near 1.00 to1.20 and post-percolation exponent t be near 1.50 to 2.00-provided dynamic percolation dominates over static percolation in microemulsions 40,43,52,56,57. …”

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confidence: 97%

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Dynamic Percolation and Swollen Behavior of Nanodroplets in 1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate/Triton X-100/Cyclohexane Microemulsions

Rahman

Mollah

et al. 2016

J. Phys. Chem. B

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Microemulsions comprising an ionic liquid (IL), 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([emim][OTf]), as the polar component, Triton X-100 as a surfactant, and cyclohexane as the nonpolar medium were prepared and characterized. Conductivity and dynamic viscosity data were critically analyzed to confirm dynamic percolation among the droplets that are in continuous motion, aggregation, and fission. The transition from oil-continuous phase to bicontinuous phase was observed at the conductance and viscosity percolation thresholds and sharp changes in the values of conductivity and dynamic viscosity could be identified. Dynamic light scattering measurements revealed swelling of the droplets, which varied within the hydrodynamic diameter range of 10-100 nm. Diffusivity of the droplets suggested less Brownian movement with increased amount of the IL. Moreover, changes in the droplet sizes and diffusivity with increase in IL content supported dynamic percolation within the systems.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 97%

Dynamic Percolation and Swollen Behavior of Nanodroplets in 1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate/Triton X-100/Cyclohexane Microemulsions

Rahman

Mollah

et al. 2016

J. Phys. Chem. B

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“…Although the high viscosity of ILs is one of the features highlighted as restricting their broader use (limitation of reaction rate, mass transport), there are only two reports 8,26 Our first observation is that the dynamic viscosities of the binary IL/TX-100 systems are much higher than those of the pure components (Table 3). However, in the presence of the cosurfactant, the addition of water affects the viscosity of these systems in a totally different way (Fig.…”

Section: Dynamic Viscosity Measurementsmentioning

confidence: 97%

“…Recently, several groups have prepared and characterized aqueous microemulsions containing ionic liquids, mainly [BMIM][PF 6 ]. Nonionic compounds, usually oxyethylene derivatives of octylphenol (TX-100) and sorbitan (Tween 20), are used as surfactants; 17,[22][23][24][25][26] however, a few systems containing anionic dioctyl sodium sulfosuccinate (AOT) in mixed films were also proposed in combination of AOT:1-hexanol 27 and AOT:TX-100. 28 Moreover, surfactantless systems containing short-chain alcohols were presented.…”

Section: Introductionmentioning

confidence: 99%

Transport properties of aqueous ionic liquid microemulsions: influence of the anion type and presence of the cosurfactant

Piekart

Łuczak

2015

Soft Matter

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Transport properties, viz. specific conductivity, dynamic viscosity and apparent diffusion coefficients, were measured as a function of water content in aqueous ionic liquid microemulsions containing 1-butyl-3-methylimidazolium hexafluorophosphate, [BMIM][PF6] and bis(trifluoromethanesulphonyl)imide, [BMIM][Tf2N], stabilized by the nonionic surfactant TX-100, or its mixture with a cosurfactant, i.e. butanol. The investigation covered the whole water content range through various (Winsor I-III and dissolved solution) structures of the system. The comparative approach allowed closer inspection into phenomena being on the background of observed transport properties behavior taking into account the influence of the cosurfactant. The addition of butanol offers considerable advantages, such as an increase in conductivity, especially in systems containing ionic liquids with lower conductivity. This is accompanied by a significant decrease in viscosity, even to values that are comparable with those of molecular solvents. Moreover, the reasons for the surprisingly higher conductivity of [BMIM][PF6]-based systems were provided, and the conclusions were supported by cyclic voltammetry as well as spectrophotometric and dynamic light scattering measurements.

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“…However, percolation in nonionic surfactant RMs have been sparsely studied. 9,10 We have extensively studied the shape, size, and internal structure of nonionic surfactant RMs in surfactant/ oil system for the last ten years. We have successfully underlined the fundamental understanding of the microstructure and morphology control of nonionic surfactant RMs.…”

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confidence: 99%

Percolation Behavior of Nonionic Reverse Micellar Solution

Aramaki¹,

Ichikawa²,

Shrestha³

2017

Chem. Lett.

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We report the percolation behavior of nonionic surfactant reverse micelles (RMs) composed of sorbitan laurate (Span20) and poly(oxyethylene) sorbitan monooleate (Tween80) in isopropyl myristate (IPM) in presence of a trace amount of water and electrolyte (KCl). Abrupt increase of conductivity above 20°C for oil/surfactant = 8/2 and Span20/Tween80 = 3/2 composition is an indication of the typical percolation behavior. The dynamic percolation behavior was suggested based on the scaling analysis of the conductivity change around the percolation temperature. Contrary to the ionic surfactant RMs, conductivity maxima was observed in the present nonionic RM system. Small-angle X-ray scattering (SAXS) data showed sphere-to-rod-type RM microstructure transition with increasing temperature in the lower temperature region. On the other hand, RM shrunk in the high temperature region due to dehydration of poly(oxyethylene) chains. It is anticipated that this characteristic feature of nonionic surfactant led to the depercolation at high temperatures.Keywords: Reverse micelle | Percolation | Conductivity Self-assembly has been recognized as a ubiquitous aspect of modern chemistry. 13 Reverse micelle (RM) or w/o microemulsion formed in nonpolar solvents, which is one of the surfactant self-assembled structures, has not been as extensively studied as the normal micelles in aqueous systems, in spite of several promising applications such as reaction media for nanomaterial preparation, chemical and biological reactions. Among the RM studies, electrical percolation behavior in ionicsurfactant-based systems has been extensively studied.46 Although RMs in nonaqueous systems show limited conductivity at low temperature or at low water concentration, the conductivity abruptly increases after a threshold temperature or water content. It is generally believed that such electrical percolation occurs because of clustering or transient fusion of RMs,7,8 which allows transfer of ions in the water pool of RMs. Percolation behavior in ionic surfactant (especially Aerosol OT) RM systems has been broadly investigated over the decades. However, percolation in nonionic surfactant RMs have been sparsely studied. 9,10 We have extensively studied the shape, size, and internal structure of nonionic surfactant RMs in surfactant/ oil system for the last ten years. We have successfully underlined the fundamental understanding of the microstructure and morphology control of nonionic surfactant RMs. 1113 Based on a decade-long experience on RMs, we aimed to study electrical percolation behavior of nonionic surfactant RM systems.Nonionic surfactants used in the present study, poly(oxyethylene) sorbitan monooleate (Tween80) and sorbitan laurate (Span20), were purchased from Sigma-Aldrich Co., and Tokyo Chemical Industry (TCI) Co., respectively. We chose those surfactants because it has been reported that nonionic reverse micelles or microemulsions can be formed using those surfactants.14,15 Isopropyl myristate (IPM) and potassium chloride (KCl) were purchas...

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Studies on formation and percolation in ionic liquids/TX-100/water microemulsions

Cited by 15 publications

References 57 publications

Dynamic Percolation and Swollen Behavior of Nanodroplets in 1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate/Triton X-100/Cyclohexane Microemulsions

Dynamic Percolation and Swollen Behavior of Nanodroplets in 1-Ethyl-3-methylimidazolium Trifluoromethanesulfonate/Triton X-100/Cyclohexane Microemulsions

Transport properties of aqueous ionic liquid microemulsions: influence of the anion type and presence of the cosurfactant

Percolation Behavior of Nonionic Reverse Micellar Solution

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