Dynamics of pyrenesemicarbazide and pyrenethiosemicarbazide in reverse micelle of AOT in n-heptane: Probing critical penetration of water molecules toward the palisade

Maity, Arnab; Das, Shrabanti; Ghosh, Prasun; Das, Tarasankar; Seth, Sourav Kanti; Mondal, Somen; Gupta, Parna; Purkayastha, Pradipta

doi:10.1016/j.cplett.2013.09.055

Cited by 5 publications

(5 citation statements)

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“…The most widely studied RM till date for various purposes is that made by the anionic surfactant sodium bis(2-ethylhexyl) sulfosuccinate or simply Aerosol OT, long known to form spherical RMs over a wide range of W S values. [1][2][3][4][5][6] Though the impetus has always been on the study of aqueous reverse micelles due to its relevance with biological elds, 1,2,7,8 in the recent years, reverse micelles containing nonaqueous polar solvents such as glycerol, ethylene glycol, dimethyl formamide, acetonitrile, methanol [9][10][11][12][13] etc. have been extensively studied mainly for their suitability to create a nonaqueous nanoscale restricted geometry for synthetic purposes.…”

Section: Introductionmentioning

confidence: 99%

Probing the location of methanol in methanol/AOT/n-heptane system: true microemulsion or bi-continuous medium?

et al. 2014

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Section: Introductionmentioning

confidence: 99%

Probing the location of methanol in methanol/AOT/n-heptane system: true microemulsion or bi-continuous medium?

et al. 2014

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“…It is known that water molecules can penetrate to some extent inside the RM, slightly altering the polarity. 20 This is reflected in Figure 2B, where there is an enhancement in the fluorescence intensity of CNPs in hexane on addition of AOT due to the hydrophobic entrapment, followed by a slight decrease with a red shift on addition of water (w 0 = 15). Motional restriction of the CNPs on gradual formation of the aqueous core in RMs is suggested by the enhancement in the steady-state fluorescence anisotropy (Figure 2C) since the CNPs penetrate further toward the aqueous core.…”

Section: ■ Results and Discussionmentioning

confidence: 87%

“…Controlled addition of water ( w 0 = 5–15) results in formation of the AOT RMs. It is known that water molecules can penetrate to some extent inside the RM, slightly altering the polarity . This is reflected in Figure B, where there is an enhancement in the fluorescence intensity of CNPs in hexane on addition of AOT due to the hydrophobic entrapment, followed by a slight decrease with a red shift on addition of water ( w 0 = 15).…”

Section: Resultsmentioning

confidence: 90%

Synergic Influence of Reverse Micelle Confinement on the Enhancement in Photoinduced Electron Transfer to and from Carbon Nanoparticles

et al. 2015

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The photoexcited behavior of carbon nanoparticles (CNPs) and the effect of confinement on photoinduced electron transfer (PET) to and from the CNPs have been examined by confining the nanoparticles and electron donor−acceptor systems in aerosol OT (AOT)/hexane/water reverse micelles (RMs). The CNPs and the electron donor dimethylaniline (DMA) are captured in the nonpolar environment of the RMs, while methyl viologen (MV 2+ ), the electron acceptor, readily goes into the water pool. This confined medium facilitates experimentation on the electron transfer dynamics between two different phases. PET from DMA to MV 2+ via CNPs is the expected phenomenon. The ultrafast photogenerated MV •+ cation radical acts as an electron sink scavenging electrons from DMA. PET has been confirmed from steady-state and time-resolved fluorescence along with ultrafast transient absorption measurements. The kinetic details of PET in the DMA−CNP− MV 2+ assembly in a confined RM medium provide prospects toward development of light energy conversion devices. ■ INTRODUCTIONInterfacial electron transfer (IET) plays a key role in many applications, such as water purification, 1 solar energy conversion, 2 molecular electronics, 3 etc., and hence has attracted the attention of scientists. In ET phenomena, the injection and recombination rates depend on the strength of electronic coupling between light-harvesting molecules serving as the electron donor and a charge transport semiconductor acting as the electron acceptor. A popular example can be cited for application of photoinduced ET (PET) in semiconductor quantum dot (QD) solar cells where the QDs act as lightharvesting materials. 4−6 ET rates in donor−bridge−acceptor systems can be controlled by tuning the electronic coupling strength through the use of polymeric bridges between QDs and mesoporous oxides. 4 Boehme et al. studied PET between CdTe and CdSe QDs in a QD film. 5 They reported that efficient electron trapping in CdTe QDs obstructs electron transfer to CdSe QDs under most conditions. These examples show that QD−metal oxide junctions are integral parts of nextgeneration solar cells, light-emitting diodes, and nanostructured electronic arrays. Comprehensive examination of ET at metal oxide junctions by Tvrdy et al. using a series of CdSe QD donors and metal oxide nanoparticle acceptors shows that the ET rate constants depend strongly on the change in the system free energy. 6 With a similar purpose, Zhao et al. investigated the rate of PET from PbS@CdS core@shell QDs to wide band gap semiconducting mesoporous films. 7 They could fine-tune the electron injection rate by determining the width and height of the energy barrier for tunneling from the core to the oxide films using different electron affinities of the metal oxides, core sizes, and shell thicknesses. Although there have been a wide range of studies on this aspect, controversies often emerge regarding the quantum efficiency and the rate of charge transfer. 8 Harris et al. attempted to provide a better understanding of the eve...

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“…A vesicle to micelle to vesicle transformation was reported by Sarkar et al , They showed such a transition in a mixture of a cationic surfactant and an anionic ionic liquid. A stand-out, biocompatible transformation of vesicles to micelles to vesicles using a cationic surfactant and cyclodextrin in an aqueous medium was shown by Ghosh et al Maity et al followed up their findings with the semicarbazide and thiosemicarbazide pyrene derivatives to look into the dynamics of the critical penetration of interfacial water into the periphery of reverse micelles . Looking to apply the reverse micellar interface to a new facet, Bhunia et al explored the dynamics of photoinduced electron transfer (PET) inside an aqueous pool of reverse micelles using copper nanoclusters (Cu NCs) (Figure ).…”

Section: Importance Of Interfacial Interactionsmentioning

confidence: 99%

“…A stand-out, biocompatible transformation of vesicles to micelles to vesicles using a cationic surfactant and cyclodextrin in an aqueous medium was shown by Ghosh et al 20 Maity et al followed up their findings with the semicarbazide and thiosemicarbazide pyrene derivatives to look into the dynamics of the critical penetration of interfacial water into the periphery of reverse micelles. 21 Looking to apply the reverse micellar interface to a new facet, Bhunia et al explored the dynamics of photoinduced electron transfer (PET) inside an aqueous pool of reverse micelles using copper nanoclusters (Cu NCs) (Figure 1). 22 They discovered that the PET rate is governed by the effective local concentration of the electron acceptor inside the reverse micelles.…”

Section: Importance Of Interfacial Water In the Chemicalmentioning

confidence: 99%

Events at the Interface: How Do Interfaces Modulate the Dynamics and Functionalities of Guest Molecules?

Chatterjee

Purkayastha

2022

Langmuir

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Chemical and biological interfaces are of various types, which could be between two materials of the same and/or different states, two phases of the same material, biological substrates and the outer environment, surfactant or polymeric membranes and the bulk, and so forth. Small-molecule guests frequently interact with such interfaces that decide their functionalities. The structural and behavioral properties undergo considerable characteristic changes, which control their final course of action in the targeted application. This Perspective will discuss mainly the chemical interfaces constituted by the surfactants, polymers, lipids, and nucleic acids and their impacts on the dynamics of small-molecule guests. Some specific and interesting phenomena and future prospects will be elucidated in this Perspective.

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Dynamics of pyrenesemicarbazide and pyrenethiosemicarbazide in reverse micelle of AOT in n-heptane: Probing critical penetration of water molecules toward the palisade

Cited by 5 publications

References 36 publications

Probing the location of methanol in methanol/AOT/n-heptane system: true microemulsion or bi-continuous medium?

Probing the location of methanol in methanol/AOT/n-heptane system: true microemulsion or bi-continuous medium?

Synergic Influence of Reverse Micelle Confinement on the Enhancement in Photoinduced Electron Transfer to and from Carbon Nanoparticles

Events at the Interface: How Do Interfaces Modulate the Dynamics and Functionalities of Guest Molecules?

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