TY - JOUR
T1 - DNA- and Field-Mediated Assembly of Magnetic Nanoparticles into High-Aspect Ratio Crystals
AU - Park, Sarah S.
AU - Urbach, Zachary J.
AU - Brisbois, Chase A.
AU - Parker, Kelly A.
AU - Partridge, Benjamin E.
AU - Oh, Taegon
AU - Dravid, Vinayak P.
AU - Olvera de la Cruz, Monica
AU - Mirkin, Chad A.
PY - 2020/1/1
Y1 - 2020/1/1
N2 - Under an applied magnetic field, superparamagnetic Fe3O4 nanoparticles with complementary DNA strands assemble into crystalline, pseudo-1D elongated superlattice structures. The assembly process is driven through a combination of DNA hybridization and particle dipolar coupling, a property dependent on particle composition, size, and interparticle distance. The DNA controls interparticle distance and crystal symmetry, while the magnetic field leads to anisotropic crystal growth. Increasing the dipole interaction between particles by increasing particle size or external field strength leads to a preference for a particular crystal morphology (e.g., rhombic dodecahedra, stacked clusters, and smooth rods). Molecular dynamics simulations show that an understanding of both DNA hybridization energetic and magnetic interactions is required to predict the resulting crystal morphology. Taken together, the data show that applied magnetic fields with magnetic nanoparticles can be deliberately used to access nanostructures beyond what is possible with DNA hybridization alone.
AB - Under an applied magnetic field, superparamagnetic Fe3O4 nanoparticles with complementary DNA strands assemble into crystalline, pseudo-1D elongated superlattice structures. The assembly process is driven through a combination of DNA hybridization and particle dipolar coupling, a property dependent on particle composition, size, and interparticle distance. The DNA controls interparticle distance and crystal symmetry, while the magnetic field leads to anisotropic crystal growth. Increasing the dipole interaction between particles by increasing particle size or external field strength leads to a preference for a particular crystal morphology (e.g., rhombic dodecahedra, stacked clusters, and smooth rods). Molecular dynamics simulations show that an understanding of both DNA hybridization energetic and magnetic interactions is required to predict the resulting crystal morphology. Taken together, the data show that applied magnetic fields with magnetic nanoparticles can be deliberately used to access nanostructures beyond what is possible with DNA hybridization alone.
KW - colloidal crystals
KW - high-aspect ratio crystals
KW - iron oxide nanoparticles
KW - magnetic nanoparticles
KW - nanoparticle superlattices
UR - http://www.scopus.com/inward/record.url?scp=85076355861&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85076355861&partnerID=8YFLogxK
U2 - 10.1002/adma.201906626
DO - 10.1002/adma.201906626
M3 - Article
C2 - 31814172
AN - SCOPUS:85076355861
VL - 32
JO - Advanced Materials
JF - Advanced Materials
SN - 0935-9648
IS - 4
M1 - 1906626
ER -