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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Nanotechnology

Background:

  • Co-assembly of small molecules into nanostructures with tunable activities is a key goal in supramolecular materials.
  • Designing oppositely charged self-assembling motifs is common, aiming to promote mixing via electrostatic interactions.
  • Distinguishing co-assembly from self-sorting experimentally can be challenging.

Purpose of the Study:

  • To investigate the self-assembly behavior of oppositely charged tetrapeptides.
  • To determine if electrostatic interactions lead to co-assembly or self-sorting.
  • To explore the impact of disparate nanostructures on the final assembly properties.

Main Methods:

  • Synthesis and characterization of two oppositely charged tetrapeptides.
  • Controlled mixing of the tetrapeptides at various ratios.
  • Microscopy and mechanical property measurements to analyze assembly structures and behavior.

Main Results:

  • The self-assembly of oppositely charged tetrapeptides resulted in highly disparate nanostructures: fibrillar and spherical assemblies.
  • Mixing the peptides did not alter the inherent nanostructure of the parent peptides, indicating self-sorting.
  • Surface-mediated interactions between spherical and fibrous assemblies led to enhanced mechanical properties via fiber bundling.
  • The observed self-sorting was confirmed as a thermodynamic product, not kinetically trapped structures.

Conclusions:

  • Electrostatic interactions can drive self-sorting in oligopeptide self-assembly, leading to distinct nanostructures.
  • The presence of disparate parent nanostructures facilitates the observation and understanding of electrostatic-driven self-sorting.
  • Surface interactions between different self-sorted assemblies can enhance overall material properties.