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Controlled-Alignment Patterns of Dipeptide Micro- and Nanofibers.

Xingcen Liu1,2, José Danglad-Flores2, Stephan Eickelmann2

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Summary

Diphenylalanine (FF) peptide self-assembly forms ordered microfibers and nanofibers on substrates. Process parameters like gas flow and concentration control fiber morphology and stripe formation for potential applications.

Keywords:
assemblycontrolled alignmentdip coatingdipeptidemicrofiber/nanofiber

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomaterials

Background:

  • Ordered peptide assemblies offer unique material properties.
  • Controlling self-assembly is key for targeted applications.
  • Diphenylalanine (FF) is a model peptide for studying self-assembly.

Purpose of the Study:

  • To investigate the controlled formation of diphenylalanine (FF) peptide assemblies.
  • To understand the influence of process parameters on FF aggregate morphology.
  • To explore the deposition of FF assemblies as ordered stripes.

Main Methods:

  • Dip-coating technique on planar substrates.
  • Controlled precipitation from aqueous ammonia solutions via solvent evaporation.
  • Online optical microscopy for real-time growth observation.
  • Systematic variation of process parameters: gas flow, withdrawal speed, FF concentration, and ammonia concentration.

Main Results:

  • Diphenylalanine (FF) self-assembly yields microfibers and nanofibers.
  • Process parameters dictate fiber morphology (straight microfibers vs. curved nanofibers).
  • Under specific conditions, FF fibers aggregate into uniform stripes.
  • Large arrays of regular width and spacing stripes can be deposited.

Conclusions:

  • The dip-coating method enables controlled self-assembly of diphenylalanine (FF) peptides.
  • External parameters significantly influence the morphology and arrangement of FF aggregates.
  • Achieved control over FF fiber and stripe formation opens possibilities for fabricating ordered nanostructures.