book of abstracts - IM2NP

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A B S T R A C T S MONDAY, JUNE 28 N A N O S E A 2 0 1 0 exceptional self-assembly process possesses interesting properties. As for now, their unique properties contain high stability to heat and solvents, high rigidity and supercapacitance properties. In our studies we report for the first time in the bio-organic world on the direct observation of quantum confined nanocrystalline structure at various peptide nanostructures. These highly ordered building blocks of the structures have been observed from optical studies where pronounced quantum confinement (QC) and photoluminescence (PL), which results in an intense blue emission, have been revealed. We found a step-like optical absorption behavior, which is a distinguished feature of 2D-QC, and a spike-like behavior, which is a feature of 0D-QC. By calculations we have estimated the dimension of those crystalline regions to be at the order of only ~1 nm, a size that is most difficult to achieve at the inorganic world using common deposition techniques. These data directly indicates on the presence of fine crystalline structure at the PNT and allows relating these PNT to self-assembly ceramic-like nanostructural bio-inspired material. By following the formation of the exciton we could follow the self-assembly process of the structures. Our new findings of blue emission from the PNT may result in a peptide-based luminescence device, such as light emitting diode (LED) or laser. The studied peptide nanostructures were being inspired by motifs from amyloid proteins. This inspiration promoted us to explore also the self-assembly process of amyloid proteins. We have found that the selfassembly process of amyloid fibrils is also characterized with the formation of nano crystalline regions and exhibit the formation of an exciton and QC structures. 18H30-18H50 Creating biofibre-noble metal nanocomposites - an in situ sputter deposition investigation. Stephan V. Roth1,*, Volker Körstgens2, Kai Schlage1, Sebastien Couet1,3, Ezzeldin Metwalli2, Ralf Röhlsberger1, Rainer Gehrke1, Peter Müller-Buschbaum2 (1HASYLAB-DESY, Notkestr. 85, D-22607 Hamburg, Germany; 2TU-Muenchen, Physik-Department Lehrstuhl E13, Garching, Germany; 3K.U. Leuven, Afdeling Kern- en Stralingsfysica, 3001 Heverlee, Belgium)*stephan.roth@desy.de 1 – Introduction Polymer-metal nanocomposites are used in many areas of sensor techniques, information technology and biotechnology [1]. The creation of nanocomposites using self-assembly during solution casting and sputter deposition are one of the most widely used methods [2,3]. Todays reduction of structural sizes for many sensor-type and information devices based on nanocomposite materials creates a need for investigating the nanocomposite's structure in such a restricted geometry [1]. Typically, these devices display a flat geometry. However, using aligned cylindrical, wire- or stripe-like arrays of nanoparticles enables to install plasmon waveguide devices which allow for guiding electromagnetic energy below the diffraction limit of light [3]. 2 – Abstract We explore in-situ the self-assembly of metal nanoparticles on curved, flexible biopolymeric fibers using grazing incidence small angle x-ray scattering (GISAXS) in combination with in-situ sputter deposition, following the same route used to coat flat nanostructured polymer blends [4]. This fiber-metal nanocomposite acts as a model system for many industrial applications, like anti-counterfeiting and cosmetic products, as well. 27
A B S T R A C T S MONDAY, JUNE 28 N A N O S E A 2 0 1 0 3 – Conclusion We observe a well-defined growth of Au nanoparticles on the curved fiber surface. Starting from nucleation, the Au nanoparticles self-assemble to nm-sized clusters. Finally a coalescent layer occurs on the biofiber surface. One future application of this nanocomposite material might indeed be as plasmonic waveguides based on a highly flexible substrate. [1] M. Wolkenhauer et al., Appl. Phys. Lett. 89, 054101 (2006) [2]S. V. Roth et al., J. Phys.: Condens. Matter 21, 264012 (2009) [3] S. Maier et al., Nature Mat. 2, 229 (2003) [4] E. Metwalli et al., Langmuir 24, 4265 (2008) 18H50-19H10 Toward multifunctional energetic materials nanostructuration through DNA directed nanoparticles self assembly. F. Severac, C.Rossi, A.Bancaud, A.Esteve (LAAS-CNRS - 7, avenue du Colonel Roche 31077 Toulouse Cedex 4 FRANCE.) fseverac@laas.fr – rossi@laas.fr – abancaud@laas.fr - aesteve@laas.fr 1 – Introduction Energetic materials (EMs) are substances that store chemical energy which can be released under a stimulus. They can be used in many applications such as military, health, spatial… In this context, Al/CuO couple is interesting because of its high potential energy and compatibility with MEMS technologies. At the nanoscale, the performances of these materials increase significantly but are difficult to control, thus, a bottom-up approach through DNA directed Al and CuO nanoparticles self assembly is a good way to realize multifunctional nanoenergetic materials with controlled formulation. 2 – Abstract In this work, the ability to create crystalline aggregates of Al and CuO nanoparticles (nAl and nCuO) from the bottom up is studied. Several nAl and nCuO functionalization strategies are investigated in order to connect modified single-stranded DNA (ssDNA) oligomers on surface: Thiol affinity, biotin-streptavidin binding and amide link. Nanoparticles are then assembled using hybridization between ssDNA grafted on their surface, thus, small aggregates of nAl and nCuO are achieved. The controlled self assembly of nanoparticles will allow us to study with accuracy the effect of nanoenergetic materials formulation on performances: ignition point, stability, energy... 3 – Conclusion Al and CuO nanoparticles aggregates realized through DNA directed nanoparticles self assembly will be presented. Next step is a first step toward nanoenergetic materials with well defined properties and their integration in future MEMS devices. 28
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