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Symposium Functional Nanoparticles Tagesübersichten FUNCTIONAL NANOPARTICLES (SYNP) gemeinsam veranstaltet mit den Fachverbänden Chemische Physik und Polymerphysik (CPP) Dielektrische Festkörper (DF) Halbleiterphysik (HL) Magnetismus (MA) Oberflächenphysik (O) Prof. Dr. Thomas Schimmel Dr. Bernd Rellinghaus Institut für Angewandte Physik Sonderforschungsbereich 445 Universität Karlsruhe Institut für Verbrennung und Gasdynamik Wolfgang-Gaede-Straße 1 Universität Duisburg-Essen Physikhochhaus 5.-8.OG Lotharstraße 1 D-76131 Karlsruhe D-47048 Duisburg E-Mail: thomas.schimmel@physik.uni-karlsruhe.de E-Mail: brell@ivg.uni-duisburg.de Functional nanoparticles are of great scientific interest, since on the nanometer scale, many physical properties become size dependent. The variation of size, shape, composition, and chemical functionality of the particles and their surfaces provides a high potential for the engineering of novel physical and chemical properties. Nanoparticles can be tailored not only to optical, magnetic, dielectric, and semiconducting properties, but also to meet specific catalytic and biological functions. A broad range of examples for the use of such particles includes coatings, medical applications, cosmetics, catalysis, novel ferroelectric systems, magnetic storage media, etc. The symposium highlights current key areas of nanoparticle research and emphasizes its technological impact. ÜBERSICHT DER HAUPTVORTRÄGE UND FACHSITZUNGEN (Hörsaal H1) Hauptvorträge SYNP 1.1 Di 09:30 (H1) Semiconductor Nanocrystals: Science and Applications, Moungi Bawendi SYNP 1.2 Di 10:15 (H1) Nano-Optics with Chemically Functionalized Metal Nanoparticles, Jochen Feldmann SYNP 1.3 Di 10:45 (H1) Biomedical Applications of Magnetic Nanoparticles, Lutz Trahms SYNP 2.1 Di 11:30 (H1) Deposited Nanoparticles: Models for Heterogeneus Catalysts, Hans-Joachim Freund SYNP 2.2 Di 12:00 (H1) Nanoscale Ferroelectrics, Marin Alexe SYNP 2.3 Di 12:30 (H1) Synthesis and Application of Functional Nanomaterials, Andreas Gutsch, Peter Ottersbach SYNP 2.4 Di 12:50 (H1) Nanomaterials in Industrial Applications, Ralf Anselmann, V. Hilarius, G. Pfaff, M. Kursawe, H. Winkler Fachsitzungen SYNP 1 Functional Nanoparticles - I Di 09:30–11:15 H1 SYNP 1.1–1.3 SYNP 2 Functional Nanoparticles - II Di 11:30–13:10 H1 SYNP 2.1–2.4
Symposium Functional Nanoparticles Dienstag Fachsitzungen – Hauptvorträge – SYNP 1 Functional Nanoparticles - I Zeit: Dienstag 09:30–11:15 Raum: H1 Hauptvortrag SYNP 1.1 Di 09:30 H1 Semiconductor Nanocrystals: Science and Applications — •Moungi Bawendi — Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA Semiconductor nanocrystal quantum dots that are of high crystal quality and have high fluorescence quantum yields have spurred detailed studies of their electronic and optical properties. Their color range with size as a result of quantum confinement has motivated applications in fields ranging from biology to optical devices. This talk will review the chemistry of nanocrystal quantum dots, the study of the fluorescence properties of single nanocrystal dots and the insights that have been obtained, the incorporation of nanocrystal dots in organic light emitting devices, the observation of stimulated emission and lasing from nanocrystal dots under optical pumping and the application of nanocrystal dots in biological and biomedical imaging. Hauptvortrag SYNP 1.2 Di 10:15 H1 Nano-Optics with Chemically Functionalized Metal Nanoparticles — •Jochen Feldmann — Photonics and Optoelectronics Group, Physics Department and CeNS, Ludwig-Maximilians-Universität München, Amalienstrasse 54, D-80799 München, Germany Hybrid systems comprising (bio-)molecules with specific functions and metal nanoparticles of variable geometry and size offer unique and novel possibilities in nano-optics and optical bio-sensing. When molecules and metal nanoparticles approach each other, their mutual interaction leads to characteristic changes in the fluorescent [1] and light scattering properties [2]. Time-resolved fluorescence spectroscopy and single particle light SYNP 2 Functional Nanoparticles - II scattering techniques are well suited to study such processes in detail. Potential applications in bio-photonics and medical diagnostics are discussed. [1] E. Dulkeith, A.C. Morteani, T. Niedereichholz, T.A. Klar, J. Feldmann, S. Levi, F.C. van Veggel, D.N. Reinhoudt, and M. Möller, Phys. Rev. Lett. 89, 203002 (2002) [2] G. Raschke, S. Kowarik, T. Franzl, C. Sönnichsen, T.A. Klar, J. Feldmann, A. Nichtl, K. Kürzinger, Nano Letters 3, 935 (2003) Hauptvortrag SYNP 1.3 Di 10:45 H1 Biomedical Applications of Magnetic Nanoparticles — •Lutz Trahms — Laboratory for Bioelectricity and Biomagnetism, Physikalisch-Technische Bundesanstalt Berlin, D-10587 Berlin, Germany Magnetic nanoparticles (MNP) having dimensions ranging from a few nanometers up to a few hundred nanometers may be employed as smart in-vivo probes, which develop their activity only after external stimulation. Taking advantage of their particular interaction with externally applied homogeneous or inhomogeneous constant or time dependent magnetic fields, MNP can be utilised for a variety of biomedical applications. Magnetic drug targeting and MNP-coupled hyperthermia are promising new therapies, which may improve the prognosis for cancer patients. A couple of years ago MNP were introduced into radiological diagnostics as a new contrast agent for magnetic resonance imaging. Yet little attention has been given to the applicability of SQUIDs for localising and quantifying the amount of MNP accumulated in human tissue. With their high sensitivity to the magnetic relaxation of MNP, SQUID relaxometry of MNP could become another useful diagnostic method, in particular for monitoring MNP-based therapies. Zeit: Dienstag 11:30–13:10 Raum: H1 Hauptvortrag SYNP 2.1 Di 11:30 H1 Deposited Nanoparticles: Models for Heterogeneus Catalysts — •Hans-Joachim Freund — Fritz-Haber-Institut der Max-Planck- Gesellschaft, Department of Chemical Physics, Faradayweg 4-6, D-14195 Berlin, Germany In an attempt to model heterogeneous and heterogenized homogeneous catalysts, well-ordered thin oxide films of alumina and silica have been prepared onto which metal nanoparticles have been deposited via evaporation of metal from an oven. By controlling the flux of the metal and the surface temperature nanoparticle ensembles with a rather narrow size distribution and well-defined morphology may be grown. These systems are well suited to be investigated applying surface science tools. We report on a variety of properties of such systems including the electronic structure, the adsorption as well as the reactive properties. In particular, size and morphology dependences are studied, both under ultrahigh vacuum as well as under ambient conditions. We show that such systems, to a certain extent, allow us to bridge the gaps between catalysis and surface science. Sum Frequency generation is employed to study vibrational spectra of surfaces species under ambient pressures. Hauptvortrag SYNP 2.2 Di 12:00 H1 Nanoscale Ferroelectrics — •Marin Alexe — Max-Planck Institute of Microstructure Physics, D-06120 Halle, Germany Nanotechnology is expected soon to have a big impact on most of our life. Sustained effort will be necessary to transform the nowadays dreams into reality, and the only way to do it is to acquire a good knowledge on phenomena at nanoscale. The science of atoms and molecules, on one end, and the science of matter from microstructure to larger scale, on the other, are generally established. The remaining size spectrum, roughly from 1 nm to 100 nm, represents the nanoscale at which properties of materials are clearly size dependent and can be engineered or tailored. Among all materials, functional materials are expected to play an important role in the establishing of nanotechnology. Moreover, among nanoscale functional materials ferroelectrics are expected to have a major involvement in fields such as sensors and actuators, memory devices, and optics. The present lecture will give the last achievements in the nanofabrication of ferroelectric materials with both top-down and bottom-up approaches. Preparation and characterization of ultrathin films, nano-rods and -tubes, and nanostructures will be presented. Special emphasis will be put on nanoscale ferroelectric crystals fabricated by self-pattering and nano-shell ferroelectric tubes fabricated using template-mediated methods. Hauptvortrag SYNP 2.3 Di 12:30 H1 Synthesis and Application of Functional Nanomaterials — •Andreas Gutsch and Peter Ottersbach — Degussa AG, Creavis Technologies & Innovation, Paul-Baumann-Str.1, D-45764 Marl, Germany Nanomaterials and ultra-thin functional coatings of nanoparticles will determine the utility of many products in the future. Degussa possesses many years of experience in the manufacture and marketing of fine powders. Fumed silica is used in particular as a reinforcing filler in silicone rubber and to control the rheology of coatings and colorants. Industrial carbon black is used particularly in the tire industry and as a pigment in printing inks, coatings and plastics. Nanoscale titanium dioxide and zinc oxide ensure effective ultraviolet-filter formulations. The nanoscale character of such pigments enables easy processing and combines high sun protection factors with transparency and nice skin feel-
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