Prezentacja programu PowerPoint

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NoE Initiative Functional Nanostructured
Materials Witold Lojkowski Coordinator of
Center of Excelence at High Pressure Research
Center Polish Academy of Sciences
http//www.unipress.waw.pl
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The initiative originated at the High Pressure
Research Center Link between high pressure and
nanotechnology High Pressure Extended controll
of microstructure and phase composition
P
athermally activated processes
media gas up to 1.5 GPa liquid up to 2 GPa solid
up to 10 GPa
controll of kinetics
controll of phase composition
control of solubility supercritcal fluids
materials, proteins, cells
T, up to 2000 K
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• The subject requires strong international
  cooperation
• Therefore, as first step
• Network of Centers of Excellence
• Interfacial effects, novel properties and
  technologies of nanostructured materials"
• Was organised by my in 2001 based on the Centers
  of Excellence. 6 Workshops
• Working groups formed in a natural way
• Nanopowders and nanoceramics
• Bulk nanostructured metals formed by severe
  plastic deformation
• Under construction polymer nanocomposites.
• Magnetic nanomaterials
• Big acceleration of research
• Now selected examples of the results obtained.

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Example 1 Hydrothermal synthesis of rare earth
doped nano-oxides with controlled grain size and
phase composition Sintering of nanocrystalline
powders
50 nm
In future Nanocrystallie compacts as
alternative to single crystals? Perhaps easier to
fabricate and with additional controll of
properties? Perhaps STREP Nano-optoceramics
8 nm
Luminescence decay in Nano-ZrO20.05 wtPr as a
function of grain size. Possibilty to controll
decay times by varying the grain size.
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Example 2 Nanocomposites and treatment of surface
by nano-infiltration
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Metal, polimer, monomer, semiconductor
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P
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nanopowder with nanopores
heater
P
going to melting point of the material to be
infiltred
P
P
P
Nanocomposite after infiltration
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SiC diamond nanocomposites produced by
infiltration of Si in nano-diamond
Hardness 35 GPa
Hardness 95 GPa
SiC- diamond nanocomposite Uniform hardness from
75 to 85 GPa
Conventional SiC-diamond composite
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• Example 3
• Nanostrutured nickel with at the same time high
  strenght up to 1 GPa and high plasticity.
• New deformation mechanisms due to small size of
  the grains
• No dislocation movement, a lot of grain boundary
  sliding and rotation of grains

Tensile properties of submicron Ni
UTS ultimate tensile stress, YS yield stress,
EL elongation at fracture.
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EC projects we plan to submit NoE
Nanostructured functional materials STREP/
Nano Ceramics for Optoelectronics and
Photonics Synthesis and consolodation of
nanostructured ceramics for optoelectronics.
Including polymer-nanoceramic composites Marie
Curie training sites jointly with the network
members
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SIZE EFFECTS LEAD TO NEW FUNCTIONAL PROEPRTIES,
UNKNOWN FOR MICROCRYSTALLINE MATERIALS OR SINGLE
CRYSTALS Therefore the proposal of NoE
Functional Nanomaterials 3.4.1.1 Long-term
interdisciplinary research into understanding
phenomena, mastering processes and developing
research tools Expanding knowledge in
size-dependent phenomena - NE STREP CA
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H.-J. Fecht and W. Lojkowski INTERFACE
CONTROLLED MULTI-FUNCTIONAL NANOMATERIALS AND
THEIR APPLICATION Network of Excellence
Proposal NanoNet EU 6th FP Brussels
presentation, Sept. 25, 2002
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Next workshop will be connected with European
Materials Research Society (E-MRS) 2003 FALL
MEETING
http//www-emrs.c-strasbourg.fr
http//www.unipress.waw.pl Warsaw University of
Technology, September 15th 19th, 2003 Deadline
for Abstract Submission May 10, 2003
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-------------- MEETING CHAIRS K. Kurzydlowski,
W. Lojkowski, A. Mycielski, P. Siffert,
Symposium A NOVEL WIDE BANDGAP MATERIALS FOR
OPTOELECTRONIC AND ELECTRONIC APPLICATIONS Symposi
um B DEVELOPMENT OF METHODS FOR CHARACTERIZING
THE MICROSTRUCTURE OF NOVEL MATERIALS Symposium
C 5th INTERNATIONAL WORKSHOP ON MOLECULAR BEAM
EPITAXY AND VAPOUR PHASE EPITAXY GROWTH PHYSICS
AND TECHNOLOGY Symposium D COLOSSAL
MAGNETORESISTANCE NEW MATERIALS AND NEW
IDEAS Symposium E MATERIALS FOR MEDICAL
APPLICATIONS Symposium F NANOMATERIALS FOR
OPTOLECTRONICS AND FUNCTIONAL NANOMATERIALS Sympos
ium G BULK AND GRADED NANOMETALS High Pressure
School on Biotechnology nad Nanotechnology Workosh
op of our NANOStructured materials Network