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Microstructure of Polyelectrolyte Nanoaggregates Studied by Fluorescence Probe Method

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Abstract

The microstructure of water soluble nanoaggregates based on polyelectrolyte complex formed by the cationic comb-type copolymer poly(acrylamide -co-[3- (methacryloyl-amino)propyl] trimethylammonium chloride)-graft- polyacrylamide [P(AM-co-MAPTAC)-g-PAM] and the anionic linear polyelectrolyte sodium polyacrylate (NaPA) was investigated using the fluorescence probe technique. The fluorescence probe were 1-anilinonaphthalene-8-sulfonic acid (ANS), pyrene (Py) and 1,10-bis(1-pyrene) decane (PD). The fluorescence properties in polyelectrolyte complex solutions, which are sensitive to either micropolarity (ANS, Py) or microviscosity (PD), were related to the quantities obtained in different pure or mixed solvents. Micropolarities were quantified utilizing the polarity common index (Reichardt) E T(30). ANS and Py showed a variation of the micropolarity with the charge ratio of the two polymers, with the lowest polarity reached at the complex neutralization. The PD probe, by its excimer-to-monomer fluorescence intensities ratio, enabled us to evidence the effect of the composition and the comb-type copolymer grafting density on the microviscosity of the interpolyelectrolytes aggregates. It has been found that the microviscosity increased with the density of the grafting PAM chains.

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Acknowledgments

Financial support from the National University Research Council—Executive Agency for Higher Education and Research Funding (CNCSIS) PN 2 IDEI project code1317 is gratefully acknowledged.

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Authors and Affiliations

  1. Institute of Physical Chemistry, “I.G. Murgulescu” Romanian Academy, Splaiul Independentei 202, 060021, Bucharest, Romania

    Marilena Vasilescu, Daniel G. Angelescu & Rodica Bandula

  2. Department of Chemical Engineering, University of Patras, Patras, Greece

    Georgios Staikos

Authors
  1. Marilena Vasilescu
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  2. Daniel G. Angelescu
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  3. Rodica Bandula
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  4. Georgios Staikos
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Correspondence to Marilena Vasilescu.

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Vasilescu, M., Angelescu, D.G., Bandula, R. et al. Microstructure of Polyelectrolyte Nanoaggregates Studied by Fluorescence Probe Method. J Fluoresc 21, 2085–2091 (2011). https://doi.org/10.1007/s10895-011-0907-2

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