Water–AOT–alkylbenzene microemulsions: Influence of alkyl chain length on structure and percolation behavior

Appel, Markus; Spehr, Tinka Luise; Wipf, Robert; Stühn, Bernd

doi:10.1016/j.jcis.2012.02.062

Cited by 22 publications

(24 citation statements)

References 28 publications

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“…The better stability for the higher alkylbenzenes is presumably due to the weaker penetration of oil molecules into the lipophilic part of the AOT molecules [20]. As mentioned before the small toluene molecules are expected to strongly penetrate the surfactant tails, increasing the spontaneous curvature of the surfactant layer and thus favouring smaller droplets [20]. This penetration effect might also influence the droplet inter- [20].…”

Section: Shifting the Percolation Threshold By Changing The Continuoumentioning

confidence: 84%

“…As mentioned before the small toluene molecules are expected to strongly penetrate the surfactant tails, increasing the spontaneous curvature of the surfactant layer and thus favouring smaller droplets [20]. This penetration effect might also influence the droplet inter- [20]. The greyed areas mark the two-phase regions of the microemulsions action, a property which can be investigated by dielectric percolation measurements as discussed in Sect.…”

Section: Shifting the Percolation Threshold By Changing The Continuoumentioning

confidence: 87%

“…Solid lines are fits according to a model of spherical droplets with hard sphere interaction, for details we refer to [17]. Right Measured polar radii for different choices of oil: Decane [3,[17][18][19], heptane [3], toluene [3,20] and alkylbenzenes [20].…”

Section: Fig 25mentioning

confidence: 99%

“…The reason is the penetration of the toluene molecules into the AOT tails preventing curvatures necessary for the formation of larger droplets. In particular, in this microemulsion percolation does not occur [20,81]. Appel and co-workers performed a series of experiments to get a thorough understanding of the occurrence or absence of a percolation transition and a shift of phase boundary with respect to ω and φ [20].…”

Section: Shifting the Percolation Threshold By Changing The Continuoumentioning

confidence: 99%

“…In particular, in this microemulsion percolation does not occur [20,81]. Appel and co-workers performed a series of experiments to get a thorough understanding of the occurrence or absence of a percolation transition and a shift of phase boundary with respect to ω and φ [20]. They gradually changed the properties of the external phase by the use of alkylbenzenes with increasing length of the alkyl group, being in limit either toluene (methylbenzene) or more alkane-like (octylbenzene).…”

Section: Shifting the Percolation Threshold By Changing The Continuoumentioning

confidence: 99%

See 4 more Smart Citations

Aggregate Structure and Dynamic Percolation in Microemulsions

Kraska

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Stühn

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Bottom-Up Self-Organization in Supramolecular Soft Matter

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This contribution deals with a special class of soft matter systems called microemulsions. They are mixtures of oil and water stabilized with a surfactant. The stabilisation is achieved through the reduction of interfacial tension by the amphiphilic surfactant. They thus consist of oil and water phases separated by a surfactant layer. The nanoscopic structure of these phases, in particular that of spherical nano droplets, is analysed in this chapter. The impact of temperature and mixing ratio of the constituents is shown. The fascinating phenomenon of dynamic droplet percolation and aggregation near a temperature induced phase separation are discussed. Microemulsions provide an excellent model system for the investigation of confinement effects on molecules. Conversely these guest molecules modify structural and dynamical properties of the microemulsion. This may even lead to the formation of transient networks with short time gel-like and long time self-diffusion dynamics of droplets.

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Section: Shifting the Percolation Threshold By Changing The Continuoumentioning

confidence: 84%

Section: Shifting the Percolation Threshold By Changing The Continuoumentioning

confidence: 87%

Section: Fig 25mentioning

confidence: 99%

Section: Shifting the Percolation Threshold By Changing The Continuoumentioning

confidence: 99%

Section: Shifting the Percolation Threshold By Changing The Continuoumentioning

confidence: 99%

See 3 more Smart Citations

Aggregate Structure and Dynamic Percolation in Microemulsions

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Bottom-Up Self-Organization in Supramolecular Soft Matter

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Phase 2 trial of induction and concurrent chemoradiotherapy with weekly irinotecan and cisplatin followed by surgery for esophageal cancer

Ilson

Minsky

et al. 2011

Cancer

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BACKGROUND: Preoperative chemoradiation improves survival in esophageal and gastroesophageal junction (GEJ) cancer. We evaluated irinotecan and cisplatin as induction chemotherapy followed by concurrent chemoradiation in esophageal cancer. METHODS: Patients with uT1N1M0 or uT2-4NanyM0 resectable squamous cancer or adenocarcinoma of the esophagus or GEJ received irinotecan 65 mg/m 2 and cisplatin 30 mg/m 2 for 4 treatments in weeks 1

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Micropolarity and Hydrogen‐Bond Donor Ability of Environmentally Friendly Anionic Reverse Micelles Explored by UV/Vis Absorption of a Molecular Probe and FTIR Spectroscopy

et al. 2018

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In the present work we show how two biocompatible solvents, methyl laurate (ML) and isopropyl myristate (IPM), can be used as a less toxic alternative to replace the nonpolar component in a sodium 1,4-bis-2-ethylhexylsulfosuccinate (AOT) reverse micelles (RMs) formulation. In this sense, the micropolarity and the hydrogen-bond ability of the interface were monitored through the use of the solvatochromism of a molecular probe (1-methyl-8-oxyquinolinium betaine, QB) and Fourier transform infrared spectroscopy (FTIR). Our results demonstrate that the micropolarity sensed by QB in ML RMs is lower than in IPM RMs. Additionally, the water molecules form stronger H-bond interactions with the polar head of AOT in ML than in IPM. By FTIR was revealed that more water molecules interact with the interface in ML/AOT RMs. On the other hand, for AOT RMs generated in IPM, the weaker water-surfactant interaction allows the water molecules to establish hydrogen bonds with each other trending to bulk water more easily than in ML RMs, a consequence of the dissimilar penetration of nonpolar solvents into the interfacial region. The penetration process is strongly controlled by the polarity and viscosity of the external solvents. All of these results allow us to characterize these biocompatible systems, providing information about interfacial properties and how they can be altered by changing the external solvent. The ability of the nontoxic solvent to penetrate or not into the AOT interface produces a new interface with attractive properties.

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Water–AOT–alkylbenzene microemulsions: Influence of alkyl chain length on structure and percolation behavior

Cited by 22 publications

References 28 publications

Aggregate Structure and Dynamic Percolation in Microemulsions

Aggregate Structure and Dynamic Percolation in Microemulsions

Phase 2 trial of induction and concurrent chemoradiotherapy with weekly irinotecan and cisplatin followed by surgery for esophageal cancer

Micropolarity and Hydrogen‐Bond Donor Ability of Environmentally Friendly Anionic Reverse Micelles Explored by UV/Vis Absorption of a Molecular Probe and FTIR Spectroscopy

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