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Evolution of Staircase Structures in Diffusive Convection
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Light-Induced Structural Evolutions in Electrostatic Nanoassemblies.

Mohit Agarwal1,2, Ralf Schweins2, Franziska Gröhn1

  • 1Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen, Germany.

Polymers
|January 28, 2026
PubMed
Summary
This summary is machine-generated.

Researchers used light-responsive dyes and dendrimers to control nanoscale self-assembly in real-time. This photoisomerization-driven method allows for tunable structures, advancing adaptive materials and drug delivery systems.

Keywords:
electrostatic self-assemblyin situ SANSkineticsnanoparticle morphology evolutionspherical-to-ellipsoidal transition

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Real-time monitoring of nanoscale self-assembly under external stimuli is crucial for developing dynamic materials.
  • While electrostatic self-assembly is known, its real-time study under light irradiation is underexplored.

Purpose of the Study:

  • To investigate the kinetics and morphological evolution of electrostatic self-assembly driven by light-responsive azobenzene dyes (AY38) and polyamidoamine (PAMAM) dendrimers.
  • To establish photoisomerization as a mechanism for controlling self-assembly kinetics and nanoscale architectures.

Main Methods:

  • Utilized a custom in situ small-angle neutron scattering (SANS) setup for real-time tracking of morphological transformations.
  • Employed light-responsive azobenzene dyes (AY38) and pH-sensitive PAMAM dendrimers.
  • Investigated two distinct assembly pathways: pre-irradiated cis-AY38 (slow kinetics) and direct UV-induced assembly (fast kinetics).

Main Results:

  • Demonstrated that trans-cis isomerization kinetics of AY38 directly influence self-assembly rates, aggregate stability, and zeta-potential.
  • Observed a morphological transition from spherical to ellipsoidal structures.
  • Correlated structural changes with electrostatic and dipole-dipole interactions.

Conclusions:

  • Photoisomerization-driven self-assembly offers a robust method for creating tunable nanoscale architectures.
  • This approach is promising for applications in adaptive photonic materials, targeted drug delivery, and reconfigurable nanostructures.