Photoinduced electron and energy transfer from coumarin 153 to perylenetetracarboxylic diimide in bmimPF6/TX-100/water microemulsions

Wu, Haixia; Wang, Haixia; Xue, Likun; Li, Xiyou

doi:10.1016/j.jcis.2010.09.069

Cited by 13 publications

(6 citation statements)

References 64 publications

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“…This ability was shown to be beneficial in terms of electron and energy transfer in comparison to conventional systems. 36 The high conductivity of IL-MEs was utilized by Dong et al 37 to obtain a conductive polymer in a [BMIM][PF 6 ]/Tween20/H 2 O microemulsion at a relatively lower cost, which was achieved by reduction of the IL content.…”

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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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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“…The amphiphilic surfactant can self-assemble in ILs to form different aggregates such as micelles, vesicles, or liquid crystals. , Indeed, special attention to surfactant organization in ILs could open new research directions toward micellar catalysis into IL media, solvation enhancement for apolar entities, and lyotropic properties experimentally as well as theoretically during the past decades . Up to now, various kinds of microemulsions containing IL have been prepared, including IL-in-oil and oil-in-IL microemulsions, IL-in-water and water-in-IL microemulsions, and IL-in-IL microemulsion. − Recently, the creation of microemulsions with IL as the continuous phase and CO 2 as the dispersed phase has been reported first . The novel microemulsion including surfactant N -ethyl perfluorooctylsulfonamide and IL 1,1,3,3-tetramethylguanidinium acetate has many advantages such as the tunable size of dispersed CO 2 droplet and designable features of ILs, which may be used in material synthesis, chemical reactions, and extraction.…”

Section: Introductionmentioning

confidence: 99%

Influence of Counterions on Micellization of Tetramethylammonium Perfluorononanoic Carboxylate in 1-Butyl-3-methylimidazolium Ionic Liquid

et al. 2012

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The influence of counterions on micellization of perfluorononanoic carboxylate ammonium salts in water and 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim]BF(4)) solutions was investigated by surface tension and (19)F NMR measurements and freeze-fracture transmission electron microscopy (FF-TEM) observations. Changes in the counterions of the fluorocarbon surfactants have different effects on the two solvents. With the increase of counterion volume, the critical micelle concentration (cmc) value of relevant fluorinated surfactant decreases in aqueous solutions. This is because the counterions with larger size, such as (+)N(CH(3))(4), can be little hydrated, which can screen the electrostatic repulsion of the headgroups of the fluorocarbon surfactant and thus facilitate micelle formation. However, the fluorocarbon surfactants can dissolve and form micelles in [bmim]BF(4) only when they provide with largest counterion such as (+)N(CH(3))(4). This is because the counterion, (+)N(CH(3))(4), disperses the charge of the cations, which could weaken the electrostatic interaction between the ion pair of the surfactant, leading to a higher degree of counterion binding. The thermodynamic parameters estimated from the temperature dependence of the cmc values tell us that the micelle formation for tetramethylammonium perfluorononanoic carboxylate (C(8)F(17)COON(CH(3))(4), PFNT) in ionic liquids (ILs) is an entropy-driven process at low temperature but an enthalpy-driven process at high temperature. The driving force of the micellization for fluorocarbon surfactants in [bmim]BF(4) is the solvophobic effect, due to the hydrophobic and oleophobic properties of fluorocarbon chains.

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“…The dependence of the absolute PL emission quenching of dyes on the GO concentration further confirmed this conclusion (PL intensities of dyes are strongly dependent on the GO concentration) [14]. The GO itself is semi-conductive and its work function (−4.7 eV) [17,18], is lower than the lowest unoccupied molecular orbital (LUMO) level of the dyes.…”

Section: Resultsmentioning

confidence: 68%

“…Moreover, the absorption spectra of the 1:1 mixture of PDI and GO are almost identical to the sum of the absorption spectra of isolated GO and isolated PDI with the same concentrations. All these results suggested that there was no interaction between GO and PDIs at ground state in DMF [14].…”

Section: Resultsmentioning

confidence: 99%

Investigation on Fluorescence Quenching Mechanism of Perylene Diimide Dyes by Graphene Oxide

Zhao

et al. 2016

Molecules

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Perylene diimide derivatives were used as probes to investigate the effect of the molecular structures on the fluorescence quenching mechanism in a perylene diimide/graphene oxide system. The electrons transferred from the excited state of dyes to the conductive band of graphene oxide with different concentrations were determined by fluorescence spectra. The results indicated that the quenching efficiency of perylene diimides by graphene oxide was not only dependent on the difference between the lowest unoccupied molecular orbital level of dyes and the conduction band of the graphene oxide, but also mainly on the difference in the molecular structures.

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Photoinduced electron and energy transfer from coumarin 153 to perylenetetracarboxylic diimide in bmimPF6/TX-100/water microemulsions

Cited by 13 publications

References 64 publications

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

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

Influence of Counterions on Micellization of Tetramethylammonium Perfluorononanoic Carboxylate in 1-Butyl-3-methylimidazolium Ionic Liquid

Investigation on Fluorescence Quenching Mechanism of Perylene Diimide Dyes by Graphene Oxide

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