Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session K07: DNA-based Soft Matter: Design, Dynamics, and Active Mechanics I
3:00 PM–6:00 PM,
Tuesday, March 7, 2023
Room: Room 130
Sponsoring
Unit:
DSOFT
Chair: Rae Robertson-Anderson, University San Diego
Abstract: K07.00005 : Using DNA Nanostars to Program the Crystallization of DNA-Coated Colloids*
4:12 PM–4:24 PM
Presenter:
Adrian Koretsky
(Brandeis University)
Authors:
Adrian Koretsky
(Brandeis University)
Thomas E Videbaek
(Brandeis University)
W. Benjamin Rogers
(Brandeis University)
DNA-coated colloids have been used as a model system to study self-assembly, and in particular, crystallization: the formation of ordered, repeating structures. Typically, attractive interactions between particles are mediated by hybridization between DNA strands grafted onto the particles’ surfaces. In this talk, I will describe a new approach in which DNA nanostars control the interactions of DNA-coated colloids. DNA nanostars are multi-armed, self-assembled structures made up of complementary single-stranded DNA molecules. Changing the number of strands and their sequences alters the number of arms, arm length, and strength of interaction. We find that two-, four-, and eight-arm nanostars can direct the assembly of colloidal crystals with variable lattice spacing. Furthermore, whereas direct hybridization typically results in defective crystals in a one-component mixture, we find that four-arm nanostars form single-domain, faceted crystals, which we hypothesize results from changes in the crystal growth velocity and surface energies. These results suggest that DNA nanostars may be a useful tool to more easily control single crystal formation and program crystal properties, like the lattice spacing, without the need to synthesize many different particle types.
*This work is supported by the National Science Foundation (DMR-2214590)
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