la502409r_si_002.mpg (32.05 MB)
Download fileMulticore Iron Oxide Mesocrystals Stabilized by a Poly(phenylenepyridyl) Dendron and Dendrimer: Role of the Dendron/Dendrimer Self-Assembly
media
posted on 22.07.2014, 00:00 authored by David
Gene Morgan, Bethany S. Boris, Nina V. Kuchkina, Ekaterina Yu. Yuzik-Klimova, Svetlana A. Sorokina, Barry D. Stein, Dmitri I. Svergun, Alessandro Spilotros, Athanasia Kostopoulou, Alexandros Lappas, Zinaida B. Shifrina, Lyudmila M. BronsteinWe report the formation of multicore
iron oxide mesocrystals using
the thermal decomposition of iron acetyl acetonate in the presence
of the multifunctional and rigid poly(phenylenepyridyl) dendron and
dendrimer. We thoroughly analyze the influence of capping molecules
of two different architectures and demonstrate for the first time
that dendron/dendrimer self-assembly leads to multicore morphologies.
Single-crystalline ordering in multicore NPs leads to cooperative
magnetic behavior: mesocrystals exhibit ambient blocking temperatures,
allowing subtle control over magnetic properties using a minor temperature
change.