[Todos] [SEMINARIOS] SEMINARIO GCIA.INV.Y APLICACIONES-TANDAR-06/AGO/10 11hs-NIVEL 63

[Graciela Mastrogiacomo]

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                            SEMINARIOS 2010
     Gerencia Investigacion y Aplicaciones - TANDAR - CNEA
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Viernes 6 de Agosto, 11:00 Hs.

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ATENCIÓN CON EL CAMBIO DE LUGAR USUAL:

                  SALA DEL NIVEL 63, TANDAR
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Prof. Dr. Marcus Müller (*)
Institut für Theoretische Physik - Georg-August 
Universität - Göttingen


"Modelling structure formation in diblock 
copolymer materials on patterned
surfaces"

(presentación en inglés)

Diblock copolymers self-assemble into a variety of periodic
nano-structures in the bulk. The length scale is 
dictated by the molecular
extension and ranges from 10 nm to 100nm. The 
application of copolymer
materials have attracted abiding interest for 
templating nano-structures
in microelectronics and catalysis.  If the copolymer material is in
contact with a patterned surface, the morphology 
of the diblock copolymer
may either replicate the surface pattern without 
defects over large areas
or a more complex reconstruction of the soft 
morphology at the patterned
surface occurs depending on the mismatch between 
the symmetry and length
scale of surface pattern and bulk morphology. 
Certain irregular patterns
that do not have an analogue in the bulk phase 
diagram, can be replicated
by the adding  "defectants" to the copolymer material. These are
substances;e.g., homopolymers or nanoparticles; enrich at
locations, where the substrate pattern deviates 
from the bulk morphology,
and thereby reduce the excess free-energy of these local structures,
permitting defect-free replication.

Using computer simulation of soft, coarse-grained polymer models, we
investigate the directed assembly of copolymer materials on various
surface patterns. The model allows us to investigate large,
three-dimensional systems with an experimentally relevant degree of
polymerization by computer simulations. Special methods for computing
free-energy differences of self-assembled morphologies and
grain-boundaries will be discussed and applied to 
block copolymers in thin
films. The computer simulation provides a wealth 
of information about the
three-dimensional structure, its free energy, and 
also about the kinetics
of structure formation.

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(*) Ph.D. (1995) and Habilitation (1999)  in 
theoretical physics from the
Johannes Gutenberg-Universität in Mainz, Germany. 
He researched at the
University of Washington, at the University of 
Mainz, at the Edinburgh
Parallel Computing Centre, at the Instituto de Investigaciones
Fisicoquímicas Teóricas y Aplicadas of La Plata, 
at the Institute of Solid
State Research of Jülich, at the University of California and at the
Comisión Nacional de Energía Atómica. He was guest professor at the
Universidad Nacional de General San Martin, 
assistant professor at the
University of Mainz, and associate professor at the University of
Wisconsin-Madison. He is presently university 
professor at the Institute
for Theoretical Physcis at the Georg-August 
University of  Göttingen. He
was awarded with the Feodor Lynen fellowship from the Alexander von
Humbodt Foundation, with the Sponsorship for the Research of the
University of Mainz, with the Heisenberg 
fellowship of the German Science
Foundation, with a Lichtenberg professorship from the Volkswagen
Foundation and with the “John H. Dillon” Medal of 
the American Physical
Society.
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Quedan todos cordialmente invitados!

11:00 hs - Sala del nivel 63, TANDAR
CNEA - Centro Atomico Constituyentes
Av. Gral. Paz 1499 (y Constituyentes)
6772-7065 / 7007 / 7072 / 7081

Coordinadores:
Dr. Andres Arazi: < mailto: 
<https://www2.tandar.cnea.gov.ar/sqmail/src/compose.php?send_to=arazi%40tandar.cnea.gov.ar>arazi en tandar.cnea.gov.ar  
 >
Dr. Alejandro Monastra: < mailto: 
<https://www2.tandar.cnea.gov.ar/sqmail/src/compose.php?send_to=monastra%40tandar.cnea.gov.ar>monastra en tandar.cnea.gov.ar
Secretaria:
Graciela Mastrogiacomo: < mailto: 
<https://www2.tandar.cnea.gov.ar/sqmail/src/compose.php?send_to=gmastro%40tandar.cnea.gov.ar>gmastro en tandar.cnea.gov.ar  
 >
http://www.tandar.cnea.gov.ar/eventos/seminariosGIyA/


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