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Controlling Self-Assembly with Light and Temperature.

Nico Carl1,2, Wenke Müller3, Ralf Schweins1

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Researchers created self-assembling polymer-dye complexes that dissolve with UV light and reform. Temperature controls the size of these reassembled aggregates, offering a method for tunable nanomaterial formation.

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Anionic polyelectrolytes like sodium polyacrylate (PA) can form complexes with oppositely charged molecules.
  • Azobenzene dyes undergo reversible trans-cis isomerization upon light exposure, altering their properties.

Purpose of the Study:

  • To investigate the formation and properties of complexes between sodium polyacrylate and a divalent azobenzene dye.
  • To explore light-induced dissolution and temperature-controlled reformation of these polyelectrolyte-dye aggregates.
  • To elucidate the mechanism of aggregate formation and reformation.

Main Methods:

  • Preparation of polyelectrolyte-dye complexes in aqueous solution.
  • UV-Vis spectroscopy to monitor trans-cis isomerization and complex dissolution.
  • Time-resolved small-angle neutron scattering (SANS) to study aggregate structure formation.
  • Variable temperature studies to control aggregate size.

Main Results:

  • Stable, spherical aggregates formed depending on the dye-to-polyelectrolyte ratio.
  • UV light induced trans → cis isomerization, leading to dye solubility and complex dissolution.
  • Reformation of PA aggregates occurred upon dye relaxation to the trans isomer.
  • Aggregate size was effectively controlled by varying temperature during reformation.
  • SANS revealed cis → trans isomerization as rate-limiting, followed by nucleation and growth.

Conclusions:

  • Light-responsive, self-assembling polymer-dye complexes can be formed.
  • Temperature provides an efficient method to tune the size of reformed aggregates.
  • The study provides insights into the kinetics and mechanisms of light- and temperature-controlled self-assembly.