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Probing the Consequences of Cubic Particle Shape and Applied Field on Colloidal Crystal Engineering with DNA
Author(s) -
Urbach Zachary J.,
Park Sarah S.,
Weigand Steven L.,
Rix James E.,
Lee Byeongdu,
Mirkin Chad A.
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202012907
Subject(s) - superlattice , chemical physics , dipole , crystallography , materials science , self assembly , colloidal crystal , ligand (biochemistry) , nanoparticle , scattering , particle (ecology) , cubic crystal system , field (mathematics) , crystal (programming language) , nanotechnology , dna origami , colloid , dna , condensed matter physics , chemistry , nanostructure , physics , optics , optoelectronics , mathematics , oceanography , receptor , computer science , biochemistry , programming language , organic chemistry , pure mathematics , geology
In a magnetic field, cubic Fe 3 O 4 nanoparticles exhibit assembly behavior that is a consequence of a competition between magnetic dipole–dipole and ligand interactions. In most cases, the interactions between short hydrophobic ligands dominate and dictate assembly outcome. To better tune the face‐to‐face interactions, cubic Fe 3 O 4 nanoparticles were functionalized with DNA. Their assembly behaviors were investigated both with and without an applied magnetic field. Upon application of a field, the tilted orientation of cubes, enabled by the flexible DNA ligand shell, led to an unexpected crystallographic alignment of the entire superlattice, as opposed to just the individual particles, along the field direction as revealed by small and wide‐angle X‐ray scattering. This observation is dependent upon DNA length and sequence and cube dimensions. Taken together, these studies show how combining physical and chemical control can expand the possibilities of crystal engineering with DNA.