NoE Initiative Functional Nanostructured Materials

Witold Łojkowski

Coordinator of Center of Excelence at

High Pressure Research CenterPolish Academy of Sciences http://www.unipress.waw.pl

T, up to 2000 K

Pmedia:gas up to 1.5 GPaliquid up to 2 GPasolid up to 10 GPa

athermally activatedprocesses

controll of kineticscontroll of phase composition

The initiative originated at the High Pressure Research CenterLink between high pressure and nanotechnologyHigh Pressure : Extended controll of microstructure and phase composition

materials, proteins, cells

control of solubilitysupercritcal fluids

The subject requires strong international cooperationTherefore, 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 WorkshopsWorking groups formed in a natural way:• Nanopowders and nanoceramics• Bulk nanostructured metals formed by severe plastic deformation• Under construction –polymer nanocomposites.•Magnetic nanomaterialsBig acceleration of researchNow selected examples of the results obtained.

Example 1Hydrothermal synthesis of rare earth doped nano-oxides with controlled grain size and phase compositionSintering of nanocrystalline powders

Luminescence decay in Nano-ZrO2+0.05 wt%Pr as a function of grain size. Possibilty to controll decay times by varying the grain size.

8 nm

50 nm

In future:Nanocrystallie compactsas alternative to single crystals?Perhaps easier to fabricate andwith additional controll of properties?Perhaps STREP Nano-optoceramics

nanopowder with nanopores

P

P

PPheater

Nanocomposite – after infiltration

P

P

P

P

Metal, polimer, monomer,semiconductor

going to melting pointof the materialto be infiltred

Example 2Nanocomposites and treatment of surface by nano-infiltration

Conventional SiC-diamondcomposite

SiC- diamond nanocompositeUniform hardness from 75 to 85 GPa

Hardness 35GPa

Hardness 95 GPa

SiC – diamond nanocomposites produced by infiltration of Si in nano-diamond

Example 3a) 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

unipress

Tensile properties of submicron Ni

States of Ni UTS, MPa

D, nm YS, MPa

El, %

ECAP&CR 1050 300 990 7,6

ECAP&CR+ann. 100C/1h

920 400 895 8,8

Initial Ni 280   240 15

UTS – ultimate tensile stress, YS – yield stress, EL – elongation at fracture.

EC projects we plan to submit:

NoE Nanostructured functional materials

STREP/ Nano Ceramics for Optoelectronics and PhotonicsSynthesis and consolodation of nanostructured ceramics for optoelectronics. Including polymer-nanoceramic composites

Marie Curie training sites – jointly with the network members

SIZE EFFECTS LEAD TO NEW FUNCTIONAL PROEPRTIES, UNKNOWN FOR MICROCRYSTALLINE MATERIALS OR SINGLE CRYSTALS

Therefore the proposal ofNoE – 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

H.-J. Fecht and W. Lojkowski

INTERFACE CONTROLLED MULTI-FUNCTIONAL NANOMATERIALS

AND THEIR APPLICATION

Network of Excellence Proposal NanoNet

EU 6th FPBrussels presentation, Sept. 25, 2002

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.plWarsaw University of Technology, September 15th – 19th, 2003 Deadline for Abstract Submission: May 10, 2003 ---------------------------------------------------------------MEETING CHAIRS : K. Kurzydłowski, W. Łojkowski, A. Mycielski, P. Siffert, Symposium A:NOVEL WIDE BANDGAP MATERIALS FOR OPTOELECTRONIC AND ELECTRONIC APPLICATIONSSymposium 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 IDEASSymposium E:MATERIALS FOR MEDICAL APPLICATIONS Symposium F: NANOMATERIALS FOR OPTOLECTRONICS AND FUNCTIONAL NANOMATERIALSSymposium G: BULK AND GRADED NANOMETALS

High Pressure School on Biotechnology nad NanotechnologyWorkoshop of our NANOStructured materials Network