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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Colloidal nanoparticle assembly methods leverage atomic crystallization principles.
  • Existing methods excel at controlling crystallization thermodynamics but lack kinetic control.

Purpose of the Study:

  • Investigate small-molecule additives for modulating nanoparticle assembly thermodynamics and kinetics.
  • Develop strategies for controlled nanoparticle superlattice growth.

Main Methods:

  • Introduce monovalent binding agents into superlattice growth solutions.
  • Utilize additives to compete with multivalent interparticle bonding.
  • Alter interparticle bond strength by reducing bridging complexes.

Main Results:

  • Achieved controlled modulation of nanoparticle assembly kinetics.
  • Steered assemblies to avoid kinetic traps.
  • Produced faceted single crystals under isothermal conditions.

Conclusions:

  • Small-molecule additives offer a novel route to control nanoparticle superlattice growth kinetics.
  • This approach bypasses the need for precise thermal control in crystal formation.
  • Enables programmable synthesis of complex nanoparticle superlattices.