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      Controlled optical transition rates in nanodroplets

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      Author
      Özçelik, Serdar
      Date
      2000
      Source Title
      Proceedings of the 2000 International Quantum Electronics Conference, IQEC 2000
      Publisher
      IEEE
      Pages
      194
      Language
      English
      Type
      Conference Paper
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      Abstract
      The time-resolved fluorescence measurements of 3,3′-diethyl-5,5′-dichloro-9-phenylthiacarbocyanine (DDPT) in bulk solvents and methanol-in-oil reverse micellar systems is presented which include nano-sized methanol droplets stabilized with anionic surfactant aerosol-OT (AOT) in n-heptane, at room temperature. Relative fluorescence intensities of DDPT increase with a factor of 16 in m/o reverse micelles in comparison to those in bulk methanol. The radiative and nonradiative rate constants decreases in methanol dispersions, indicating that internal motions of DDPT in the droplets is reduced due to strong electrostatic interactions between the positively charged DDPT and the negatively charged sulfonate head-groups of AOT.
      Keywords
      Drop formation
      Fluorescence
      Micelles
      Negative ions
      Solvents
      Surface active agents
      Electrostatic interactions
      Optical transition
      Reverse micellar systems
      Nanostructured materials
      Permalink
      http://hdl.handle.net/11693/27646
      Published Version (Please cite this version)
      https://doi.org/10.1109/IQEC.2000.908114
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