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Polymer and Colloid Science Group

Polymer and Colloid Science Group. People Research Activities Collaborations Output Funding Selected Presentations. IESL:03/ 2006. PEOPLE (current state). B. Loppinet, G. Petekidis (Researcher’s) G. Fytas, D. Vlassopoulos (Dept. Mat. Sci. Faculty Members) A. Larsen : Physics Technician.

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Polymer and Colloid Science Group

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  1. Polymer and Colloid ScienceGroup • People • Research Activities • Collaborations • Output • Funding • Selected Presentations IESL:03/ 2006

  2. PEOPLE (current state) • B. Loppinet, G. Petekidis (Researcher’s) • G. Fytas, D. Vlassopoulos (Dept. Mat. Sci. Faculty Members) • A. Larsen : Physics Technician • MS-Students:N. Gomopoulos, N. Koumakis, P. Voudouris • Five diploma work Students • Post Docs: E. van Ruymbeke, • PhD Students: M. Gianneli, M. Kapnistos, V. Michailidou, • M. Stiakakis, Cheng Wei, • Visiting Scientists: T. Caremans (Leuven), E. Filippidi (Harvard), • J. Gapinski (Poznan), A. Kröger (Mainz), • K. Pham (Edinburgh), S. Roberts (N. Zealand), • E. Sanders (Eindhoven), T.Sanders (Eindhoven), • J. Stellbrink (Jülich)

  3. Research Activities • Problems: • Soft Colloids: effective interactions, dynamics and rheology • Dynamics and non-linear rheology of colloidal glasses and gels • Dynamics of surface tethered polymers • Macromolecular architecture, self assembly and relaxation in polymeric systems • Laser induced concentration gradients in transparent polymer solutions • Phonons in soft structures • Development of Experimental Tools • EWDLS and combination with SPR • Combination of DLS-Echo and Rheology • FCS in Polymer Science • BS of soft structures

  4. Collaborations Over the Globe • Examples of international national collaborations

  5. Selected Presentations 1. Polymers • Responsive Brushes • Control Processing (through macromolecular architecture) • 2. Colloids • Vitrification and flow of colloidal glasses and gels • Hypersonic phononic crystals

  6. PS brushes in good solvent Polymer Brush Dynamics Light scattering in the evanescent geometry G. F., Science 1996

  7. G. Yakubov, PRL 2004 V.Michailidou Macromolecules 2005 Bad Good Responsive Brushes PS brushes in marginal solvent (cyclohexane)

  8. Rheology of Branched Polymers • Seniority Rules: Outer branches relax first. Separated in time relaxation processes. • Mean Field tube model.

  9. Attractive spheres (Depletion attraction: Hard sphere-polymer mixtures) Hard spheres Soft Spheres Multiarm stars Vitrification and flow of colloidal glasses and gels Effects of Interparticle Interactions From Hard Spheres to Repulsive (soft) and Attractive Systems

  10. t=0 t=T/2 t=T Peaks in g(2)(t) (echoes) => elastic (reversible) response of the sample Light Scattering Echo + RheologyDynamic Light scattering under oscillatory shear G. Petekidis et al. Faraday Discuss. (2003)

  11. self-assembling and infiltration procedures J.Wang,U.Jonas

  12. Inelastic Brillouin Light Scattering H.Kriegs(2003)

  13. Bragg gap

  14. Scattering Geometry

  15. Music of Spheres 1.Dry Opals particle vibrations (elastic constants) W. Cheng J.C.P (2005), M.Faatz Langmuir(2005)

  16. Perspectives (research character) Molecular Objects Desired Function Advanced Fields Design Phononic Devices, Sensors, Motors Antagonistic Forces, Selection Appropriate Morphology, Recognition eg. Polymers Colloids

  17. Future directions/needs • Bio-functional surface architecture (external collaboration: J. Rühe, J. Knoll) • Understanding of self-assembly and functions of bio-related systems (collaborations: K. Tokatlidis, A. Mitraki, University of Crete) • Single Macromolecule probing and manipulation • Needs: • Soft Matter theory/simulation • Experimentalist in biorelated systems

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