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DNA-grafted nanoparticles offer programmable control over crystal structures and phase behavior. This study demonstrates programming the full phase diagram using DNA strand displacement, enabling novel behaviors like reentrant melting.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biophysics

Background:

  • DNA-grafted nanoparticles act as programmable atom equivalents, forming crystals.
  • Their programmability has been limited to equilibrium crystal structures.

Purpose of the Study:

  • To generalize the programmability of DNA-grafted nanoparticles to their full temperature-dependent phase diagram.
  • To explore novel phase behaviors beyond simple crystal structures.

Main Methods:

  • Utilizing DNA strand displacement reactions in the buffer solution.
  • Introducing soluble DNA strands to compete with grafted strands.

Main Results:

  • Demonstrated programming of the complete phase diagram, not just crystal structures.
  • Achieved unique phase behaviors including wide gas-solid coexistence and reentrant melting.
  • Showcased reversible transitions between distinct crystal phases using only two displacement reactions.

Conclusions:

  • Programmability of DNA-grafted nanoparticles extends to complex phase behavior.
  • DNA strand displacement offers a versatile tool for designing colloidal phase diagrams.
  • This approach unlocks new possibilities for creating advanced materials with tunable properties.