AOT Reversed Micelles Investigated by Fluorescence Anisotropy of Cresyl Violet

Wittouck, Nadine; Negri, R. Martı́n; Ameloot, Marcel; Schryver, F. C. De

doi:10.1021/ja00102a029

Cited by 86 publications

(110 citation statements)

References 4 publications

(4 reference statements)

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“…The rigid interfacial film possibly restricts a little bit the rotation of the probe at the interfacial region and consequently, a small increment of increase in the anisotropy value (r) has been observed. Similar trend of anisotropy values with increase in ω was reported for AOT/heptane (dodecane)/water systems by Wittouck et al [80] and Valeur and Keh [81] using crystal violet and perylene derivatives as fluorescence probes, respectively.…”

Section: Effect Of Bmimclsupporting

confidence: 82%

“…The fluoroprobe (HCM) has been chosen in the present study, as it resides at the oil/water interface and/or faces the polar core upon excitation as reported earlier [42,44]. Accordingly, the rotational behaviour of the probe is expected to provide information about the dynamics at the interfacial region of microemulsions in response to its interaction with constituents in local environment [80]. A pictorial representation of location of HCM in studied systems is presented in Scheme S1.…”

Section: Steady State Fluorescence Anisotropy In Anionic Microemulsionsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of chemical architecture of oils and ionic liquid on the physicochemical and thermodynamic properties and microenvironment of anionic surfactant based microemulsion

Kundu

Bardhan

Banerjee

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Effect Of Bmimclsupporting

confidence: 82%

Section: Steady State Fluorescence Anisotropy In Anionic Microemulsionsmentioning

confidence: 99%

Influence of chemical architecture of oils and ionic liquid on the physicochemical and thermodynamic properties and microenvironment of anionic surfactant based microemulsion

Kundu

Bardhan

Banerjee

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Since the probes used in the study are of ionic character, they are not soluble in benzene-hexane mixture, which is the bulk phase surrounding the reverse micelles. [21][22][23][24] This model has extensively been used 8,9,12,20,[25][26][27][28][29][30][31] to explain the rotational diffusion of organic probe molecules in different kinds of organized assemblies including reverse micelles. Thus, it is logical to conclude that the probes can reside at either the micelle-water interface or near the hydrated oxyethylene chains within the core of the reverse micelles and the exact location will be established in due course.…”

Section: Resultsmentioning

confidence: 99%

Do ionic and hydrophobic probes sense similar microenvironment in Triton X-100 nonionic reverse micelles?

Dutt

2008

The Journal of Chemical Physics

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Rotational diffusion of two structurally similar ionic probes, rhodamine 110 and fluorescein, has been examined in nonionic reverse micellar system of Triton X-100/benzene-n-hexane/water as a function of mole ratio of the water to surfactant, W. This study has been undertaken to find out whether ionic and hydrophobic probes experience similar microenvironment in these reverse micelles. Experimental results indicate that, from W=0 to 3, the average reorientation time, which is a measure of the microviscosity experienced by the probe molecule, increases by 90% and 40% for rhodamine 110 and fluorescein, respectively, and from W=3 to 8, it decreases by 20% for both the probes. The increase in the average reorientation time with W has been rationalized on the basis of the flexible oxyethylene chains of the TX-100 surfactant being hydrogen bonded by the water molecules, which makes the core region less fluid. However, once the hydration of the oxyethylene chains is complete, further addition of water results in formation of water droplet; which renders the micelle-water interface in the core region less compact leading to a marginal decrease in the average reorientation time of the probe molecules. These explanations are consistent with the location of the probes and the structure of the Triton X-100/benzene-hexane/water reverse micelles. To compare how the microenvironment experienced by these ionic probes is different from the hydrophobic ones, results from our earlier work [J. Phys. Chem. B 108, 7944 (2004)] have been considered. Such a comparison revealed that both ionic and hydrophobic probes experience similar microenvironment in these reverse micelles until the hydration of the oxyethylene chains is complete. In case of hydrophobic probes, however, the onset of water droplet formation does not alter their microenvironment, which is due to their location in the reverse micellar cores.

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“…The dynamical properties of organic dye molecules in supramolecular aggregates may depend upon its location and interaction with the surrounding microenvironments. 15,[37][38][39][40][41][42] The chemical nature and charge of dye molecules and aggregates play an important role regarding the solubilization site in the surfactant aggregates. There are some reports regarding the rotational motion, location and mobility of hydrophobic and hydrophilic molecules in surfactant forming micelles.…”

Section: Introductionmentioning

confidence: 99%

5-Methyl Salicylic Acid-Induced Thermo Responsive Reversible Transition in Surface Active Ionic Liquid Assemblies: A Spectroscopic Approach

et al. 2016

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This article describes the formation of stable unilamellar vesicles involving surface active ionic liquid (SAIL), 1-hexadecyl-3-methylimidazolium chloride (C16mimCl), and 5-methyl salicylic acid (5mS). Turbidity, dynamic light scattering (DLS), transmission electron microscopy (TEM), and viscosity measurements suggest that C16mimCl containing micellar aggregates are transformed to elongated micelle and finally into vesicular aggregates with the addition of 5mS. Besides, we have also investigated the photophysical aspects of a hydrophobic (coumarin 153, C153) and a hydrophilic molecule (rhodamine 6G (R6G) perchlorate) during 5mS-induced micelle to vesicle transition. The rotational motion of C153 becomes slower, whereas faster motion is observed for R6G during micelle to vesicle transition. Moreover, the fluorescence correlation spectroscopy (FCS) measurements suggest that the translational diffusion of hydrophobic probe becomes slower in C16mimCl-5mS aggregates in comparison to C16mimCl micelle. However, a reverse trend in translational diffusion motion of hydrophilic molecule has been observed in C16mimCl-5mS aggregates. Moreover, we have also found that the C16mimCl-5mS containing vesicles are transformed into micelles upon enhanced temperature, and it is further confirmed by turbidity, DLS measurements that this transition is a reversible one. Finally, temperature-induced rotational motion of C153 and R6G has been monitored in C16mimCl-5mS aggregates to get a complete scenario regarding the temperature-induced vesicle to micelle transition.

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AOT Reversed Micelles Investigated by Fluorescence Anisotropy of Cresyl Violet

Cited by 86 publications

References 4 publications

Influence of chemical architecture of oils and ionic liquid on the physicochemical and thermodynamic properties and microenvironment of anionic surfactant based microemulsion

Influence of chemical architecture of oils and ionic liquid on the physicochemical and thermodynamic properties and microenvironment of anionic surfactant based microemulsion

Do ionic and hydrophobic probes sense similar microenvironment in Triton X-100 nonionic reverse micelles?

5-Methyl Salicylic Acid-Induced Thermo Responsive Reversible Transition in Surface Active Ionic Liquid Assemblies: A Spectroscopic Approach

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