IJS KOLOKVIJ, sreda, 7. 9. 2011, prof. dr. Mamoru Senna

[Andreja Berglez]

Vabim vas na 1. predavanje iz sklopa "Kolokviji na IJS" v letu 2011/12, ki
bo v sredo, 7. septembra 2011, ob 13. uri v Veliki predavalnici Instituta
>Jožef Stefan< na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete
tudi na naslovu http://www.ijs.si/ijsw/Koledar_prireditev, posnetke
preteklih predavanj pa na http://videolectures.net/kolokviji_ijs. 

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prof. dr. Mamoru Senna

Keio University, Japan

Nova spoznanja pri procesiranju nanomaterialov pod mehanskim stresom

 

 

Uporaba mehanskega stresa na finih praškovnih mešanicah lahko vodi do povsem
novih funkcionalnih kompozitov, do katerih sicer ne moremo priti po nobeni
drugi metodi. Metoda temelji na kompleksnih pojavih, ki se hkrati pojavijo
ob uporabi mehanskega stresa, t.j. neelastične deformacije pri kontaktu med
različnimi komponentami in s tem povezano medsebojno atomsko izmenjavo ali
pa izgubo simetrije osnovnih gradnikov in posledično izmenjavo ligandov.
Tovrstni pojavi so še posebej pomembni takrat, ko procesiram eksotične
kombinacije, kot so na primer anorganski in organski kristali. V predavanju
bodo prikazani številni primeri sinteze nenavadnih koordinacijskih spojin,
biokompatibilnih nanokompozitov ter elektrokeramike.

Predavanje bo v angleščini.

Lepo vabljeni!

 

***

 

We would like to invite you to 1th lecture of the "Kolokvij na IJS" in the
school year 2011/12. The lecture will be held on Wednesday, September 7,
2011, at 1 pm at the JSI main lecture hall, Jamova 39, Ljubljana. The
abstract of the lecture can be found on website:
<http://www.ijs.si/ijsw/Koledar_prireditev>
http://www.ijs.si/ijsw/Koledar_prireditev, the previous recorded lectures
can be found on website:  <http://videolectures.net/kolokviji_ijs>
http://videolectures.net/kolokviji_ijs. 

********************************************



 

Prof. dr. Mamoru Senna

Keio University, Japan

 

New aspects of processing nanomaterials under mechanical stressing

 

Can a brutal force bring us anything positive?  Definitely not. This is also
the case in the nanocomposite materials in every genre. Exertion of
mechanical stressing on the fine powdered mixtures, however, brings us
fascinating states toward functional composites or compounds, which no other
methods can realize, when carried out carefully and under a solid guiding
principle. This is based on the complex phenomena occurring simultaneously,
e.g. shear stress and consequent non-elastic deformation at the contact of
dissimilar partners and associated mutual atomic penetration called
mechanical diffusion, symmetry loss of the solid construction units (e.g.
metal-O6 octahedra for many transition metal oxides) and consequent ligand
exchange, etc. This is particularly significant, when we observe the exotic
combinations, notably those of inorganic and organic crystals. Case studies
will cover syntheses of some unusual coordination compounds, biocompatible
nanocomposites and electroceramics for microdevices.

 

 

We look forward to meeting you at the "Kolokvij na IJS"!

 

 

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