470349 Programming DNA-Mediated Colloidal Self-Assembly to Control 3D Binary Superlattice Formation

Thursday, November 17, 2016: 2:00 PM
Union Square 23 & 24 (Hilton San Francisco Union Square)
Hasan Zerze1, Nathan A. Mahynski2, Minseok Song3, Yajun Ding3, Vincent K. Shen4 and Jeetain Mittal3, (1)Department of Chemical and Biomolecular Engineering, Lehigh University, Bethelehem, PA, (2)Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD, (3)Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA, (4)Chemical and Biochemical Reference Data Division, National Institute of Standards and Technology, Gaithersburg, MD

DNA-functionalized colloids are programmable materials that can self-assemble into a variety of crystal structures. Selective hybridization of conjugate base pairs of DNA molecules plays a fundamental role in tailoring the effective colloidal interactions as a useful tool to guide the formation of desired super-lattices. In binary systems, one promising advantage is the ability to independently tune the cross (A-B) and like (A-A or B-B) particle interactions via tethering two different mixtures of suitable strand sequences on different particles, known as multi-flavoring approach. This useful approach also allows controlling one of the like-like pair-interactions (A-A) independently of the other one (B-B). In this work, we conduct computer simulations to investigate the self-assembly of DNA-functionalized colloids into various 3-D binary crystals by programming cross- and like-particle interactions. The molecular dynamics simulations show that the variation of the strength of cross pair-potential relative to like interaction provides selectivity between body-centered cubic (BCC) and close-packed (FCC and HCP) structures. Moreover, changing the two like-interaction strengths (A-A and B-B) relative to one another, controls the composition of the crystals that form. In addition, the transformation kinetics and the thermodynamic stability of the formed structures will be studied.

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See more of this Session: Colloidal Dispersions I
See more of this Group/Topical: Engineering Sciences and Fundamentals