Research Interests of G. Nägele

My activities comprise theoretical investigations and computer simulations of structure, dynamics, rheology and non-equilibrium phase behavior of colloidal suspensions in bulk phase, at interfaces, in two-dimensional confinements and in external fields. The systems investigated are charge-stabilized, magnetic and neutral colloidal dispersions, and self-organized systems like microemulsions and micellar dispersions. The aim is to understand microstructural, thermodynamic, diffusional and macroscopic transport properties (viscosity, electric conductance etc.) in terms of the properties of its constituents.

List of my current research interests:

• Colloidal Microstructure and Polydispersity Effects
• Rotational and Translational Short-time Diffusion and Sedimentation
• Cooperative Diffusion and Glassy Dynamics in Colloidal Mixtures
• Generalised Stokes-Einstein Relations and Viscoelasticity
• Structure and Dynamics of Wall-Confined Colloid
• Diffusion and Rheology of Charged and Neutral Colloids
• Electrokinetic Effects in Charged Colloids (M. Kollmann)
• Dynamic Scaling and related Freezing Criteria in Two and Three Dimensions (M. Kollmann)
• Rheology and Phase Behaviour of Colloidal Mixtures (H. Wang)

• Micostructure:
  Ornstein-Zernike-type integral equation schemes, Monte-Carlo simulations.
• Diffusion and rheology:
  Projection operator formalism, mode-coupling schemes for Brownian systems, effective medium calculations, dynamic density functional theory, Brownian dynamics and Stokesian dynamics computer simulations.

Curriculum Vitae of G. Nägele

Gerhard Nägele studied physics and mathematics at the University of Konstanz, where he joined the soft matter group of Prof. R. Klein. He received there the Staatsexamen in physics and mathematics (1982), and the Diploma (1983) and Ph.D. (1987) in physics, working on the theory and computer simulation of charged and neutral colloidal dispersions and micellar systems. For his Ph.D. work, he was awarded the "Byk-Award 1988" of the Herbert-Quandt-Foundation, Altana AG. From 1988 - 1995 he continued to work in Konstanz as a postdoctoral fellow. During 1989-1990, he joined the Department of Nuclear Engineering at the University of Michigan, Ann Arbor, as a research fellow, collaborating with Prof. A.Z. Akcasu on dynamics and spinodal decomposition of polymer solutions and blends. In 1994 he obtained the Habilitation in theoretical physics at the University of Konstanz. From 1995 - 2000, he joined the physics department in Konstanz as a senior scientific teacher (Hochschuldozent). In 1998 he stayed for a period of six months at a research lab of the Daimler-Chrysler company, Friedrichshafen, working on radar simulation and visualization of natural landscapes, and on the electro-hydrodynamic simulation and optimization of high-voltage car spraying tools. In 2001 he joined the soft matter group of Prof. J. Dhont at the solid state laboratory (IFF) of the FZ Jülich as a senior scientific staff member. He spent several extended visits as a research scientist at the Institute for Advanced Study of the Polytechnical University in Mexico City (Prof. M. Medina-Noyola), and at the van't Hoff Laboratory of Colloid Chemistry at the University of Utrecht (Prof. A. Philipse and others).

Publications of the last five years

1. H. Zhang and G. Nägele,
   Short-time Translational and Rotational Diffusion in Binary Colloidal Dispersions,
   submitted.
2. G. Nägele, M. Kollmann, R. Pesché, M. Kollmann and Adolfo J. Banchio,
   Dynamic Properties, Scaling and Related Freezing Criteria in Two- and Three-dimensional Colloidal Dispersions,
   submitted.
3. R. Pesché, M. Kollmann and G. Nägele,
   Brownian Dynamics Study of Dynamic Scaling and Related Freezing Criteria in Quasi-two-dimensional Dispersions,
   J. Chem. Phys. 114, 8701 (2001).
4. R. Pesché, M. Kollmann and G. Nägele,
   Dynamic Scaling and Freezing Criteria in Quasi-two-dimensional Dispersions,
   Phys. Rev. E 64, in press (2001).
5. G. H. Koenderink, H. Zhang, M. P. Lettinga, G. Nägele and A. P. Philipse,
   Rotational Tracer-Diffusion in Binary Colloidal Sphere Mixtures,
   Phys. Rev. E 64, 022401 (2001).
6. M. Kollmann and G. Nägele,
   The Role of Hydrodynamic Interactions in Colloidal Electrolyte Friction and Sedimentation
   Europhys.Lett. 52, 474 (2000)
7. R. Pesché and G. Nägele,
   Dynamical Properties of Wall-confined Colloids
   Europhys.Lett. 51 , 584 (2000)
8. M. Kollmann and G. Nägele,
   Colloidal Electrolyte Friction and Sedimentation: a Mode-coupling Approach
   J.Chem.Phys. 113 , 7672 (2000)
9. R. Pesché and G. Nägele,
   A Stokesean Dynamics Study of Quasi-two-dimensional Suspensions Confined Between Two Parallel Walls
   Phys.Rev.E 62 , 5432 (2000)
10. A.J. Banchio, G. Nägele and J. Bergenholtz,
    Collective Diffusion, Self-Diffusion and Freezing Criteria of Colloidal Suspensions
    J.Chem.Phys. 113 , 3381 (2000)
11. A.J. Banchio, G. Nägele and J. Bergenholtz,
    Viscoelasticity and Generalised Stokes-Einstein Relations in Colloidal Dispersions
    J.Chem.Phys. 111 , 8721-8740 (1999)
12. M. Watzlawek and G. Nägele,
    Sedimentation of Strongly and Weakly Charged Colloidal Particles: Prediction of Fractional Density Dependence
    J. Colloid and Interface Sci. 214, 170 (1999)
13. A. Banchio, J. Bergenholtz and G. Nägele,
    Dynamics and Rheology of Colloidal Suspensions
    Phys.Rev.Lett. 82 , 1792 (1999)
14. G. Nägele, J. Bergenholtz and J.K.G. Dhont,
    Cooperative Diffusion in Colloidal Mixtures
    J.Chem.Phys. 110 , 7037 (1999)
15. J.K.G. Dhont and G. Nägele,
    Critical Viscoelastic Behaviour of Colloids
    Phys.Rev.E 58 , 7710 (1998)
16. G. Nägele, J. Bergenholtz and R. Klein,
    Dynamics of Colloidal Suspensions, Proceedings of the Yamada Conference L on Polyelectrolytes
    Editors: I. Noda, E. Kokofuta, 199-204 , Yamada Science Foundation (1999)
17. A.J. Banchio, G. Nägele and A. Ferrante,
    Optical Polydispersity and Contrast Variation Effects in Colloidal Dispersions
    J.Colloid and Interface Sci. 208 , 487 (1998)
18. G. Nägele and J. Bergenholtz,
    Linear Viscoelasticity of Colloidal Mixtures
    J.Chem.Phys. 108 , 9893 (1998)
19. G. Nägele and J.K.G. Dhont,
    Tracerdiffusion in Colloidal Mixtures: A Mode-Coupling Approach with Hydrodynamic Interactions
    J.Chem.Phys. 108 , 9566 (1998)
20. A. Banchio, G. Nägele, A. Ferrante and R. Klein,
    Contrast Variations and Optical Polydispersity in Colloidal Suspensions
    Progr.Colloid Polym.Sci. 110 , 54 (1998)
21. M. Watzlawek and G. Nägele,
    Self-Diffusion Coefficients of Charged Particles: Prediction of Non-linear Volume Fraction Dependence
    Phys.Rev. E 56 , 1258 (1997)
22. G. Nägele and P. Baur,
    Influence of Hydrodynamic Interactions on Long-time Diffusion in Charge-stabilized Colloids
    Europhys.Lett. 38 , 557-562 (1997)
23. G. Nägele and P. Baur,
    Long-time Dynamics of Charged Colloidal Suspensions: Hydrodynamic Interaction Effects
    Physica A 245 , 297 (1997)
24. G. Nägele, M. Watzlawek and R. Klein
    Hard Spheres versus Yukawa Particles: Differences and Similarities
    Progr.Colloid Polym.Sci. 104 , 31-39 (1997)
25. M. Watzlawek and G. Nägele,
    Diffusion of Colloids at Short Times
    Progr.Colloid Polym. Sci. 104 , 168-172 (1997)
26. G. Nägele, B. D'Aguanno and A.Z. Akcasu,
    Gasteditoren, "Workshop Colloid Physics"
    Physica A 235 (1997)
27. M. Watzlawek and G. Nägele,
    Short-time Rotational Diffusion in Monodisperse Charge-stabilized Colloidal Suspensions
    Physica A 235 , 56-74 (1997)
28. J.K. Phalakornkul, A.P. Gast, R. Pecora, G. Nägele, A. Ferrante, B. Mandl and R. Klein,
    Structure and Short-time Dynamics of Polydisperse Charge-stabilized Suspensions
    Phys.Rev. E 54 , 661-675 (1996)
29. R. Klein and G. Nägele,
    Static and Dynamic Scattering by Concentrated Systems: Theory
    Current Opinion in Colloid & Interface Science 1 , 4-10 (1996)
30. P. Baur, G. Nägele and R. Klein,
    Non-exponential Relaxation of Density Fluctuations in Charge-stabilized Colloids
    Phys.Rev. E 53 , 6224 (1996)
31. G. Nägele Habilitationsschrift,
    On the Dynamics and Structure of Charge-Stabilized Colloidal Suspensions
    Phys.Rep. 272 , 215-374 (1996)
32. G. Nägele, P. Baur and R. Klein,
    Non-exponential Relaxation of Density Fluctuations in Strongly Interacting Colloidal Suspensions
    Physica A 231 , 49-61 (1996)
33. A.Z. Akcasu, G. Nägele and R. Klein,
    Comments on the Fast-Mode and Slow-Mode Theories of Interdiffusion
    Macromol. 28 , 6680-6683 (1995)
34. D.M.E. Thies-Weesie, A.P. Philipse, G. Nägele, B. Steininger and R. Klein,
    Non-analytical Concentration Dependence of Sedimentation of Charged Silica Spheres in an Organic Solvent: Experiments and Calculations
    J.Colloid Interface Sci. 176 , 43-54 (1995)
35. G. Nägele, B. Mandl and R. Klein,
    Short-Time Dynamics and Sedimentation of Charge-stabilized Suspensions
    Progr. Colloid & Polymer Sci. 98 , 117-123 (1995)