Applied Physics A

, 125:648 | Cite as

An insight into the effect of nano-confinement on some of photo-physical parameters of dye

  • Abbas RahdarEmail author
  • Hossein Bagheri


In the current work, at first, water nanodroplets containing Rhodamine B (RhB) were prepared in water-in-oil AOT microemulsions (MEs) at a constant molar ratio of water-to-surfactant (W = 7) species with varying mass fraction of water nanodroplet (MFD). The photo-physical parameters of the dye including the ratio of the excited-to-ground-state dipole moments of RhB and Stokes shift of RhB within water the nanodroplets as well as the apparent refractive index of water nanodroplets and solvent polarity of microemulsions were studied. The quantum mechanical perturbation theory was used for the evaluation of parameters of Stokes shift and the dipole moment of excited-to-ground states of RhB. The Stokes shift of RhB at the 0.002 M decreased with MFD up to 0.04 and then increased with MFD within AOT ME. The dipole moment ratio of the ground-to-excited states (μg/μe) for RhB at 1.531 × 10–4 M decreased with MFD, whereas at 0.002 M of the dye, μg/μe for RhB decreased, as MFD increased up to MFD = 0.04 and then increased with MFD within the AOT MEs. The polarity parameter, for instance, the ET value of microemulsion system is less than that of the bulk water at a similar concentration. The apparent refractive index of water droplets within water-in-oil AOT microemulsion was different from that of bulk water.



A. Rahdar thanks from financial support of university of Zabol (Grant Code: UOZ-GR-9618–40).

Supplementary material

339_2019_2957_MOESM1_ESM.docx (40 kb)
Supplementary material 1 (docx 40 kb)


  1. 1.
    M. Hou, L. Dang, T. Liu, Y. Guo, Z. Wang, Novel Fluorescent microemulsion: probing properties, investigating mechanism, and unveiling potential application. ACS App. Mater. Interfaces 9, 25747–25754 (2017)CrossRefGoogle Scholar
  2. 2.
    A. Orte, M.J. Ruedas-Rama, J.M. Paredes, L. Crovetto, J.M. Alvarez-Pez, Dynamics of water-in-oil nanoemulsions revealed by fluorescence lifetime correlation spectroscopy. Langmuir 27, 12792–12799 (2011)CrossRefGoogle Scholar
  3. 3.
    C.A. Katz, Z.J. Calzola, J.K.N. Mbindyo, Structure and solvent properties of microemulsions. J. Chem. Educ. 85, 263–265 (2008)CrossRefGoogle Scholar
  4. 4.
    T. Bayraktutan, K. Meral, Y. Onganer, Photophysical properties of pyronin dyes in reverse micelles of AOT. J. Lumin. 145, 925–929 (2014)CrossRefGoogle Scholar
  5. 5.
    S. Granick, Motions and relaxations of confined liquids. Science 253, 1374–1379 (1991)ADSCrossRefGoogle Scholar
  6. 6.
    C.A.T. Laia, S.L.M.B. Costa, Fluorescence quenching of a squaraine dye by water in AOT reversed micelles. J. Chem. Soc. Faraday Trans 9, 2367–2373 (1998)CrossRefGoogle Scholar
  7. 7.
    G. Dutt, Fluorescence anisotropy of ionic dyes in AOT reverse micelles: influence of water droplet size and electrostatic interactions on dye dynamics. J. Phys. Chem. B 112, 7220–7226 (2008)CrossRefGoogle Scholar
  8. 8.
    J. A. B. Ferreira, S. M. B. Costa, Electronic excited-state behavior of rhodamine 3B in AOT reverse micelles sensing contact ion pair to solvent separated ion pair interconversion. J. Phys. Chem. B 114, 10417–10426 (2010)CrossRefGoogle Scholar
  9. 9.
    A. Rahdar, M. Almasi-Kashi, Dynamic and spectroscopic studies of nano-micelles comprising dye in water/dioctyl sodium sulfosuccinate/decane droplet microemulsion at constant water content. J. Mol. Struct 1128, 257–262 (2017)ADSCrossRefGoogle Scholar
  10. 10.
    A. Rahdar, M. Almasi-Kashi, Photophysics of rhodamine B in the nanosized water droplets: a concentration dependence study. J. Mol. Liq 220, 395–403 (2016)CrossRefGoogle Scholar
  11. 11.
    A. Rahdar, M. Almasi-Kashi, N. Mohamed, Light scattering and optic studies of rhodamine B-comprising cylindrical-like AOT reversed micelles. J. Mol. Liq. 223, 1264–1269 (2016)CrossRefGoogle Scholar
  12. 12.
    A. Rahdar, M. Almasi-Kashi, A.M. Khan, M. Aliahmad, A. Salimi, M. Guettari, H.E.G. Kohne, Effect of ion exchange in NaAOT surfactant on droplet size and location of dye within rhodamine B (RhB)-containing microemulsion at low dye concentration. J. Mol. Liq 252, 506–513 (2018)CrossRefGoogle Scholar
  13. 13.
    A. Rahdar, M. Almasi-Kashi, M. Aliahmad, Effect of chain length of oil on location of dye within AOT nanometer-sized droplet microemulsions at constant water content. J. Mol. Liq 233, 398–402 (2017)CrossRefGoogle Scholar
  14. 14.
    A. Rahdar, H. Najafi-Ashtiani, E. Sanchooli, Fluorescence and dynamics studies of dye-biomolecule interaction in the nano-colloidal systems. J. Mol. Struct. 1175, 821–827 (2019)ADSCrossRefGoogle Scholar
  15. 15.
    Y.G. Sıdır, I. Sıdır, Solvent effect on the absorption and fluorescence spectra of 7-Acetoxy-6-(2,3-dibromopropyl)-4,8-dimethylcoumarin: determination of ground and excited state dipole moments. Spectrochim. Acta Part A Mol. Biomol. Spectros. 102, 286–296 (2013)ADSCrossRefGoogle Scholar
  16. 16.
    S.R. Manohara, V.U. Kumar, L. Gerward, Estimation of ground and excited-state dipole moments of 1, 2-diazines by solvatochromic method and quantum-chemical calculation. J. Mol. Liq. 181, 97–104 (2013)CrossRefGoogle Scholar
  17. 17.
    R. Kian, M.S. Zakerhamidi, A.N. Shamkhali, E. Kashani, Study of the variation of intra/intermolecular interactions and configuration of a group of enone anticancer drugs as a result of solvation. J. Mol. Liq. 274, 1–4 (2019)CrossRefGoogle Scholar
  18. 18.
    M.O. Iwunze, The determination of the effective dielectric constant of micelles and microemulsions. Phys. Chem. Liq. 43, 195–203 (2005)CrossRefGoogle Scholar
  19. 19.
    K. Ahmed, A. Auni, G. Ara, M.M. Rahman, M.Y. Mollah, M.A. Susan, Solvatochromic and fluorescence spectroscopic studies on polarity of ionic liquid and ionic liquid-based binary systems. J. Bangladesh Chem. Soc. 25, 146–158 (2012)CrossRefGoogle Scholar
  20. 20.
    M.K. Sadigh, M.S. Zakerhamidi, A.N. Shamkhali, B. Shaabani, N. Rad-Yousefnia, Investigation on environmental sensitivity characteristics of pyridine compounds with different position of N-atoms and various active functional groups. J. Mol. Liq. 275, 926–940 (2019)CrossRefGoogle Scholar
  21. 21.
    J. Eastoe, R.K. Heenan, Water-induced structural changes within the L2 phase of didodecyldimethylammonium bromide–cyclohexane–water systems. J. Chem. Soc. Faraday Trans. 90, 487–492 (1994)CrossRefGoogle Scholar
  22. 22.
    W. Meier, Structured polymer networks from o/w-microemulsions and liquid crystalline phases. Langmuir 12, 6341–6345 (1996)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of ZabolZabolIslamic Republic of Iran
  2. 2.Department of English Language, Faculty of MedicineZahedan University of Medical SciencesZahedanIran

Personalised recommendations