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CPP: Chemische Physik und Polymerphysik

CPP 16: POSTER: Computational Physics, Complex Systems

CPP 16.9: Poster

Dienstag, 9. März 2004, 17:00–19:00, B

Size-dependent Assembly and Segregation of Nanoparticles at Liquid-liquid Interfaces — •Heiko Zettl¹, Yao Lin², Alexander Böker², Habib Skaff², David Cookson³, A.D. Dinsmore⁴, Todd Emrick², Georg Krausch¹, and Thomas P. Russell² — ¹Physikalische Chemie II, Universität Bayreuth, D-95440 Bayreuth, Germany — ²Department of Polymer Science and Engineering, University of Massachusetts, Amherst, MA 01003, USA — ³Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA and Australian Nuclear Science and Technology Organization, PMB 1, Menai 2234, Australia — ⁴Department of Physics, University of Massachusetts, Amherst, MA 01003, USA

The self-assembly of nanoparticles at fluid-fluid interfaces driven by the reduction in interfacial energy was investigated. With nanoparticles (2–6nm), thermal fluctuations compete with the interfacial segregation giving rise to a size-dependent self-assembly of the nanoparticles and a two-dimensional phase separation at the fluid interface. Studies on the dynamics of the nanoparticles and the self-assembled structures formed at the interface, using a pendant drop tensiometer, fluorescence photobleaching methods and in-situ grazing incidence small angle x-ray scattering (GISAXS), suggest a liquid-like behavior and ordering at the interfaces.