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Organic Modulators Enable Morphological Diversity in Colloidal Crystals Engineered with DNA.

Nikhil S Chellam1,2, Heather A Calcaterra1,2, Qinsi Xiong2,3

  • 1Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States.

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|February 4, 2025
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Summary

Formamide slows DNA-based colloidal crystal growth, reducing defects and improving crystal quality. This method enables the formation of novel, well-defined crystal habits, including the Wulff polyhedron for face-centered cubic structures.

Keywords:
X-ray scatteringcrystallizationdirected self-assemblygoldnucleic acids

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biotechnology

Background:

  • Colloidal crystal engineering with DNA offers diverse symmetries but struggles with defect formation and poor crystal habits.
  • Achieving well-defined crystal habits, especially for face-centered cubic (FCC) structures, remains a significant challenge.

Purpose of the Study:

  • To develop a strategy for improving the quality and habit formation of DNA-mediated colloidal crystals.
  • To investigate the role of chemical modulators in controlling colloidal crystallization kinetics and defect formation.

Main Methods:

  • Utilizing formamide as a chemical modulator to control the growth rate of DNA-modified colloidal particles.
  • Employing DNA hybridization to direct the self-assembly of 20 nm spherical particles into crystalline structures.
  • Analyzing crystal structures and habits formed under varying formamide concentrations.

Main Results:

  • Formamide significantly slows colloidal crystal growth, reducing defect formation and enhancing crystal quality.
  • The Wulff polyhedron, a predicted equilibrium shape, was successfully formed for FCC colloidal crystals, a novel observation in DNA-mediated assembly.
  • Diverse kinetic crystal habits, including tetrahedra, octahedra, icosahedra, and decahedra, were observed, dependent on formamide concentration.

Conclusions:

  • Formamide acts as an effective modulator for DNA-based colloidal crystallization, promoting the formation of high-quality crystals with predictable habits.
  • This approach overcomes previous limitations in achieving well-defined colloidal crystal habits, opening new avenues for materials design.
  • The ability to control kinetic habits offers unprecedented opportunities for tailoring colloidal crystal properties for specific applications.