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Complex coacervate core micelles as diffusional nanoprobes.

Nadia Bourouina1, Martien A Cohen Stuart, J Mieke Kleijn

  • 1Laboratory of Physical Chemistry and Colloid Science, Wageningen University, P.O. box 8038, 6700EK Wageningen, The Netherlands. nadia.bourouina@wur.nl martien.cohenstuart@wur.nl mieke.kleijn@wur.nl.

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Summary
This summary is machine-generated.

Stable fluorescent complex coacervate core micelles (C3Ms) were developed for use as diffusional nanoprobes. These cross-linked C3Ms exhibit enhanced stability across varying salt and pH conditions, outperforming non-cross-linked counterparts.

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Area of Science:

  • Polymer science
  • Materials science
  • Nanotechnology

Background:

  • Complex coacervate core micelles (C3Ms) offer versatile modification and ease of preparation, making them potential alternatives to expensive diffusional probes like dendrimers.
  • However, traditional C3Ms suffer from instability at high salt concentrations and when interacting with other materials, limiting their applications.
  • Developing stable C3Ms is crucial for their broader use in various scientific investigations.

Purpose of the Study:

  • To design and characterize small, stable fluorescent C3Ms with enhanced robustness.
  • To investigate the impact of cross-linking on C3M stability across different ionic strengths and pH levels.
  • To demonstrate the utility of these novel C3Ms as diffusional nanoprobes.

Main Methods:

  • Formation of C3Ms using electrostatic interactions between PEO-PMAA and fluorescently labeled PAH.
  • Irreversible core cross-linking via amide bond formation.
  • Characterization of micelle properties (radius, stability) under varying salt and pH conditions.
  • Application of fluorescence recovery after photobleaching (FRAP) to measure micelle diffusion in xanthan solutions.

Main Results:

  • Small (15 nm radius) fluorescent C3Ms were successfully synthesized and characterized.
  • Both cross-linked and non-cross-linked C3Ms demonstrated remarkable stability up to 1.5 M salt concentration, independent of ionic strength.
  • Cross-linked C3Ms showed pH-independent stability, a significant improvement over non-cross-linked versions.
  • FRAP measurements successfully quantified the diffusion of fluorescent C3Ms in xanthan solutions, showcasing their potential as nanoprobes.

Conclusions:

  • Irreversible core cross-linking significantly enhances the stability of C3Ms, particularly against pH variations.
  • These stable, fluorescent C3Ms are promising as robust diffusional nanoprobes for studying complex fluid environments.
  • The developed C3Ms present a viable and potentially more cost-effective alternative to existing diffusional probes.