Prof. Dr. Barbara Wagner

Projects as a project leader

• SE4

  Mathematical modeling, analysis and novel numerical concepts for anisotropic nanostructured materials

  Prof. Dr. Christiane Kraus / Prof. Dr. Gitta Kutyniok / Prof. Dr. Barbara Wagner

  Project heads: Prof. Dr. Christiane Kraus / Prof. Dr. Gitta Kutyniok / Prof. Dr. Barbara Wagner
  Project members: Esteban Meca Álvarez / Dr. Arne Roggensack
  Duration: -
  Status: completed
  Located at: Technische Universität Berlin / Weierstraß-Institut
  

  Description

  The project SE4 aims to develop and study mathematical models in order to understand, functionalize and optimize modern nanostructured materials. Such materials are fundamental for the design of next generation thin-film solar cells as well as batteries for the production and storage of sustainable energy, respectively. Besides the mathematical modeling, the main goals of this research project are the analysis of the developed phase field systems and the construction of numerical algorithms that efficiently capture the material properties and, in particular, their anisotropic nature. More information...
  
  http://www.wias-berlin.de/people/roggensa/se4/

• SE-AP15

  Structure Formation in Thin Liquid-Liquid Films

  Dr. Dirk Peschka / Prof. Dr. Barbara Wagner

  Project heads: Dr. Dirk Peschka / Prof. Dr. Barbara Wagner
  Project members: -
  Duration: 01.04.2011 - 30.09.2017
  Status: completed
  Located at: Weierstraß-Institut
  

  Description

  The main topic of this tandem proposal is the direct comparison of results from mathematical modeling, analysis and experimental investigations of rupture,dewetting dynamics and equilibrium patterns of a thin liquid-liquid system. The experimental system uses a PS (polystyrene)/ PMMA (polymethylmethacrylate) thin bilayer of a few hundred nanometer, whose liquid properties can be tuned from Newtonian to visoelastic rheological flow behavior by varying the length of the polymer chains. On these small scales, apart from capillary forces and viscous dissipation, intermolecular forces will play an important role in the dynamics and morphology of the interfaces. The mathematical analysis and numerical simulation of adequate thin film models that will be derived from the underlying fluid mechanical equations, will be used through direct comparisons with experiments. Thus, we aim at clarifying also fundamental properties, such as equilibrium contact angles, singularity formation or dewetting rates. This shall form the basis for more complex situations involving evaporation, surfactant monolayers, and slippage, to yield the understanding crucial for many important nanofluidic problems in nature and technology ranging from rupture of the human tear film to the interface dynamics of donor/acceptor polymer solutions used in organic solar cells.
  
  http://www.dfg-spp1506.de/project-seemann-wagner-peschka

• SE-AP16

  Phase field modeling for multi-phase systems applied to the growth of Cu(In,Ga)Se2 thin films

  Prof. Dr. Barbara Wagner

  Project heads: Prof. Dr. Barbara Wagner
  Project members: -
  Duration: 01.04.2013 - 30.09.2018
  Status: completed
  Located at: Weierstraß-Institut
  

  Description

  • phase field models involving surface diffusion, temperature, and elasticity for growing poly-Si film; • mathematical modeling of the evolution of In and Ga distributions during the growth of CIGSe thin films. Numerical simulations (in cooperation with PhD-6); • advanced phase field models for grain growth in ternary (CISe and CGSe) as well as for quaternary (CIGSe) thin films
  
  http://www.helmholtz-berlin.de/projects/hvi/microstructure/phd-projects_en.html