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Area of Science:

  • Materials Science
  • Chemical Physics
  • Nanotechnology

Background:

  • DNA-functionalized nanoparticle superlattices exhibit temperature hysteresis in their phase transitions.
  • This hysteresis is linked to critical undercooling, a phenomenon essential for studying nucleation thermodynamics.
  • Programmable atom equivalents (PAEs) offer a unique platform to investigate nucleation barriers.

Purpose of the Study:

  • To investigate the thermodynamic barrier to nucleation in DNA-functionalized nanoparticle superlattices.
  • To explore the relationship between nanoparticle coordination number and critical undercooling.
  • To understand how to control nucleation pathways in PAE systems.

Main Methods:

  • Detailed study of the assembly and disassembly of DNA-functionalized nanoparticle superlattices.
  • Analysis of temperature hysteresis to quantify critical undercooling.
  • Systematic variation of nanoparticle coordination number to observe its effect on nucleation.

Main Results:

  • Identified temperature hysteresis as critical undercooling, a key factor in nucleation thermodynamics.
  • Demonstrated that critical undercooling increases with higher nanoparticle coordination numbers.
  • Established a link between microscopic properties (coordination number) and macroscopic nucleation behavior.

Conclusions:

  • The critical undercooling in nanoparticle superlattice nucleation is dependent on nanoparticle coordination number.
  • The separable nature of DNA linkers and nanoparticle cores allows for precise control over nucleation.
  • This research provides insights into controlling nucleation pathways for advanced material design.