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Mater Sci Nanotechnol 2017 | Volume 1 Issue 2
allied
academies
Nanomaterials and Nanochemistry
November 29-30, 2017 | Atlanta, USA
International Conference on
D
evelopment of functional materials has been extensively
studied in the field of materials chemistry. We have
reported various unique magnetic functional materials using
cyano-bridged bimetallic assemblies, e.g., the photomagnetic
functionalities on iron-octacyanoniobate systems, light-induced
spin-crossover magnetic phenomenon, and photo reversible
light induced spin-crossover phenomenon, spin-crossover-
induced second harmonic generation, and photo switching
of magnetization-induced second harmonic generation.
Based on these knowledge, we developed novel metal oxide
nanoparticles with advanced functionalities such as epsilon-
iron oxide (ε-Fe
2
O
3
) and lambda-trititanium pentaoxide
(λ-Ti
3
O
5
). This presentation focuses on λ-Ti
3
O
5
. A unique phase
of Ti
3
O
5
, λ-Ti
3
O
5
, was prepared as nanoparticles. By alternatively
irradiating with 532 nm and 410 nm lights, phase transition
between λ-Ti
3
O
5
(black, metallic conductor) and beta(β)-Ti
3
O
5
(brown, semiconductor) was repeatedly observed at room
temperature. Thermodynamical analysis suggests that λ-Ti
3
O
5
is a trapped phase at a local energy minimum. Light irradiation
causes the reversible switching between this trapped state
(λ-Ti
3
O
5
) and the other energy minimum state (β-Ti
3
O
5
).
Furthermore, we have recently reported that the reversible
switching is also induced by other external stimulation such
as pressure, and have found that this material exhibits high
performance heat storage properties, which are understood
from thermodynamic studies.
Speaker Biography
Shin Ichi Ohkoshi is currently working as a Vice Dean at School of Science, The
University of Tokyo, Japan. He Published 423 papers, having 174 applications for
Patent and 173 Invited presentations. His Current research interests are in the areas of
inorganic chemistry and physical chemistry, i.e., magnetic materials, phase transition
materials, nanomagnetic materials, light-induced phase transition, etc.
e:
ohkoshi@chem.s.u-tokyo.ac.jpShin Ichi Ohkoshi
The University of Tokyo, Japan
Development of advanced functionalities on metal oxide nanoparticles