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Dye Encapsulation in Polynorbornene Micelles.

Nia C Bell1, Samantha J Doyle1, Giulia Battistelli2

  • 1Department of Chemistry & Biochemistry, University of California, San Diego , 9500 Gilman Drive, MC 0343, La Jolla, California 92093, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 26, 2015
PubMed
Summary
This summary is machine-generated.

High-Tg polynorbornene micelles effectively encapsulate hydrophobic BODIPY dyes, with loading capacity increasing with hydrophilic block size. Encapsulation rates depend on temperature and micellar structure, yielding a record triplet lifetime.

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Area of Science:

  • Polymer chemistry
  • Materials science
  • Photophysics

Background:

  • Polymeric micelles offer versatile nanostructures for encapsulating hydrophobic molecules.
  • High glass transition temperature (Tg) polymers can provide enhanced stability to nanostructures.
  • 2,6-diiodoboron-dipyrromethene (BODIPY) dyes are useful fluorescent probes but can suffer from aggregation-caused quenching.

Purpose of the Study:

  • To quantify the encapsulation efficiency of high-Tg polynorbornene micelles for a hydrophobic BODIPY dye.
  • To investigate the influence of polymer structure and temperature on dye encapsulation.
  • To characterize the photophysical properties, specifically the triplet lifetime, of the encapsulated dye.

Main Methods:

  • Utilized UV-Vis absorption spectroscopy to monitor dye aggregation state and quantify encapsulation.
  • Synthesized amphiphilic polynorbornene polymers with varying hydrophilic block lengths.
  • Measured encapsulation rates as a function of temperature and micellar morphology.
  • Determined the triplet excited state lifetime of the encapsulated BODIPY dye using time-resolved spectroscopy.

Main Results:

  • Polynorbornene micelles demonstrated encapsulation of up to one BODIPY dye per ten polymer chains.
  • Increased hydrophilic block size correlated with higher dye incorporation, suggesting association with the micelle shell.
  • Encapsulation rate showed significant temperature dependence and a minor influence from micellar morphology.
  • A record triplet lifetime of 740 μs was observed for the encapsulated BODIPY dye at room temperature.

Conclusions:

  • High-Tg polynorbornene micelles are effective carriers for hydrophobic dyes like BODIPY.
  • The micellar environment, particularly its viscosity, significantly enhances the photophysical properties of the encapsulated dye.
  • The observed long triplet lifetime is attributed to suppressed triplet-triplet annihilation within the stable micellar core.