Solvation dynamics of coumarin 480 in neutral (TX-100), anionic (SDS), and cationic (CTAB) water-in-oil microemulsions

Hazra, Partha; Chakrabarty, Debdeep; Chakraborty, Anjan; Sarkar, Nilmoni

doi:10.1016/j.cplett.2003.10.044

Cited by 31 publications

(72 citation statements)

References 37 publications

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“…[15][16][17][18][24][25][26] Polar solvation dynamics is the measure of the polar solvent response to an instantaneous change of the charge distribution in a probe molecule. Solvation dynamics of a wide variety of bulk liquids have been well studied both experimentally and In ternary AOT reverse micelles, there is a time component on the femtosecond time scale and another time component on the nanosecond time scale. 15,16 One effective method to measure solvation dynamics utilizes time-resolved fluorescence-upconversion spectroscopy to monitor the time-dependent emission spectrum of a fluorescent probe.…”

Section: Introductionmentioning

confidence: 99%

Cosurfactant Impact on Probe Molecule in Reverse Micelles

2004

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A wide variety of probe molecules have been used to characterize the environment found within reverse micelles. This manuscript reports on results from steady-state and time-resolved spectroscopies of the probe molecule Coumarin 343. The steady-state spectra for the probe molecule in ternary and quaternary systems are nearly identical. However, the time-resolved studies clearly indicate substantial differences in the probe sensed by the probe molecule. Implications of these results for the interpretation of spectroscopy of probe molecules in confined media are discussed.

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Section: Introductionmentioning

confidence: 99%

Cosurfactant Impact on Probe Molecule in Reverse Micelles

2004

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“…It is due to the fact with increase in w value the dye molecules migrate towards the polar solvent pool of the microemulsions and the size of the microemulsions also increases, so that mobility of the solvent in the microemulsion pool increases, which leads to decrease in solvent-relaxation time. In some cases where the probe molecule resides at the surface of the microemulsion, solvent-relaxation time is practically unaltered with change in w value 61,62. This result, i.e.…”

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confidence: 55%

Solvent relaxation of a room-temperature ionic liquid [bmim][PF6] confined in a ternary microemulsion

et al. 2007

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In this paper we have reported the solvent and rotational relaxation of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF 6 ]) confined in tween 20/([bmim][PF 6 ]/water microemulsion using coumarin 153 (C-153) as probe. The most interesting feature of our experiment was that we observed an increase in solvent relaxation time with increase in R (R = tween 20-to-[bmim][PF 6 ] molar ratio). This is due to the fact that with increase in [bmim][PF 6 ] content of the microemulsions, the microviscosity of the pool of the microemulsions increases, and motion of ions of [bmim][PF 6 ] is hindered in the pool of microemulsions. Since motion of ions is responsible for solvation in room-temperature ionic liquids (RTILs), solvent-relaxation time increases with increase in R.

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“…Similar kind of slow dynamics reported by Hazra et al, where they observed ∼16 ns dynamics of polyoxyethylene chain of TX-100 inside the inverse micelle. 82 Overall, ∼ 2.5 ns faster solvation dynamics in case of L 2 phase (⟨τ s ⟩ = 4.1 ns) than H II −LLC phase (⟨τ s ⟩ = 6.7 ns) is observed. As we have monitored the water dynamics inside L 2 phase by thermotropic phase change, it is not possible to rule out the effect of temperature on relaxation process.…”

Section: ■ Experimental Sectionmentioning

confidence: 85%

Solvation Dynamics in Different Phases of the Lyotropic Liquid Crystalline System

et al. 2015

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Reverse hexagonal (HII) liquid crystalline material based on glycerol monooleate (GMO) is considered as a potential carrier for drugs and other important biomolecules due to its thermotropic phase change and excellent morphology. In this work, the dynamics of encapsulated water, which plays important role in stabilization and formation of reverse hexagonal mesophase, has been investigated by time dependent Stokes shift method using Coumarin-343 as a solvation probe. The formation of the reverse hexagonal mesophase (HII) and transformation to the L2 phase have been monitored using small-angle X-ray scattering and polarized light microscopy experiments. REES studies suggest the existence of different polar regions in both HII and L2 systems. The solvation dynamics study inside the reverse hexagonal (HII) phase reveals the existence of two different types of water molecules exhibiting dynamics on a 120-900 ps time scale. The estimated diffusion coefficients of both types of water molecules obtained from the observed dynamics are in good agreement with the measured diffusion coefficient collected from the NMR study. The calculated activation energy is found to be 2.05 kcal/mol, which is associated with coupled rotational-translational water relaxation dynamics upon the transition from "bound" to "quasi-free" state. The observed ∼2 ns faster dynamics of the L2 phase compared to the HII phase may be associated with both the phase transformation as well as thermotropic effect on the relaxation process. Microviscosities calculated from time-resolved anisotropy studies infer that the interface is almost ∼22 times higher viscous than the central part of the cylinder. Overall, our results reveal the unique dynamical features of water inside the cylinder of reverse hexagonal and inverse micellar phases.

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Solvation dynamics of coumarin 480 in neutral (TX-100), anionic (SDS), and cationic (CTAB) water-in-oil microemulsions

Cited by 31 publications

References 37 publications

Cosurfactant Impact on Probe Molecule in Reverse Micelles

Cosurfactant Impact on Probe Molecule in Reverse Micelles

Solvent relaxation of a room-temperature ionic liquid [bmim][PF6] confined in a ternary microemulsion

Solvation Dynamics in Different Phases of the Lyotropic Liquid Crystalline System

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