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

[Graciela Mastrogiacomo]

>***********************************************************
>                            SEMINARIOS 2010
>     Gerencia Investigacion y Aplicaciones - TANDAR - CNEA
>***********************************************************
>Viernes 6 de Agosto, 11:00 Hs.
>
>=======================================
>ATENCION CON EL CAMBIO DE LUGAR USUAL:
>
>                  SALA DEL NIVEL 63, TANDAR
>========================================
>Prof. Dr. Marcus Müller (*)
>Institut für Theoretische Physik - Georg-August 
>Universität - Göttingen
>
>
>"Modelling structure formation in diblock copolymer materials on
>patterned
>surfaces"
>
>(presentacion en ingles)
>
>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.
>
>----------------------------------------------------------------------
>
>(*) 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
>Fisicoquimicas Teoricas y Aplicadas of La Plata, at the Institute of
>Solid
>State Research of Jülich, at the University of California and at the
>Comision Nacional de Energia Atomica. 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 ^OJohn H. Dillon  Medal 
>of the American Physical
>Society.
>----------------------------------------------------------------------
>
>
>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: arazi en tandar.cnea.gov.ar >
>Dr. Alejandro Monastra: < mailto: monastra en tandar.cnea.gov.ar
>Secretaria:
>Graciela Mastrogiacomo: < mailto: gmastro en tandar.cnea.gov.ar >
>http://www.tandar.cnea.gov.ar/eventos/seminariosGIyA/