Universidad Nacional Autónoma de México - CNyN

1st International Symposium on Nanoscience and Nanomaterials
response in excess of two orders of magnitude higher than single-phase materials. In these composites, the
origin of magnetoelectric properties resides, in general, in the elastic interaction among the constituent phases
via stress/strain mediation. Within this talk, the dependence of the magnetoelectric response to the coupling at
the interface and connectivities between the phases, in addition to the their intrinsic properties will be
discussed. Furthermore, an overview of the research done in this line by the group at CIQA, ranging from
particulate (0-0), to core-shell and columnar 1-3 like composites, is presented. As a base system, preparation,
properties and interactions in BaTiO 3 /CoFe 2 O 4 nanostructured composites in several connectivities are
presented. In addition the results of simulations of the magnetoelectric coupling in ordered nanocomposites,
using a hybrid finite element model are presented and discussed. Within the model, the deformation and stress
on the piezoelectric phase are estimated and used to simulate the magnetization reversal under stress in the
composite nanotubes, using an updated micromagnetic framework to include the magnetostriction effect.
Finally, recent progress in characterization techniques to measure direct and inverse magnetoelectric
coefficients in an unified magnetic/magnetoelectric measurement platform is summarized.
PLENARY XIII
CONNECTING THE NANODOTS: PROGRAMMABLE NANOFABRICATION OF FUSED METAL
SHAPES ON SELF-ASSEMBLING DNA TEMPLATES
Gleb Finkelstein
Duke University
DNA self-assembly is a novel branch of nanotechnology, which utilizes tools borrowed from
biochemistry in order to design and create complex artificial structures. Our group has recently developed a
novel method for producing complex metallic nanostructures of programmable shape. We work with "DNA
origami" - a type of self-assembling 2-dimensional nanostructures about 100 nm in size. DNA-functionalized
gold nanoparticles are attached to the DNA origami templates; these seed nanoparticles are then enlarged,
and even fused, by electroless deposition of silver. Using this method, we construct a variety of metallic
structures, including rings, pairs of bars, and H shapes. These structures may be interesting for a variety of
applications in electronics and plasmonics.
PLENARY XIV
THE CHALLENGES OF FABRICATING NANOCRYTALLINE LUMINESCENT MATERIALS
Joanna McKittrick
Mechanical and Aerospace Engineering
Materials Science and Engineering Program
University of California, San Diego
La Jolla, CA
There is great interest in nano-sized light emitting materials (phosphors) for applications such as in
solid-state lighting, display screens, scintillators and biological markers. The materials (phosphors) are
composted of an inert host (e.g. oxide, sulfide, nitride) and a few atomic percent of a substitutional activator
ion (transition or rare-earth element). Under external excitation, photons are produced with energies ranging
from the x-ray to IR, depending on the host and activator compositions. Despite advantages of having a small
size, which includes reduced light scattering, higher resolution (for display screens) and the potential to use
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