Generation of Nanoparticles by Laser Ablation in Liquids: Stoichi-Ometry/Composition and Characterization of NiTi-Nanoparticles

Wednesday, May 22, 2013: 14:45
Congress Hall 2 (OREA Pryamida Hotel)
Mr. Mbarek Chakif , Ruhr-Universität Bochum, Applied Laser Technology, Bochum, Germany
Prof. Andreas Ostendorf , Ruhr-Universität Bochum, Applied Laser Technology, Bochum, Germany
Mr. Aissam Essaidi , Ruhr-Universität Bochum, Applied Laser Technology, Bochum, Germany
Prof. Matthias Epple , The University of Duisburg-Essen, Essen, Germany
Dr. Oleg Prymak , The University of Duisburg-Essen, Essen, Germany
Laser ablation is an effective method to generate pure nanoparticles in a variety of liquids. Recent studies have displayed many advantages of this method, e. g. disperse distribution of the colloids in solvent, no use of toxic chemical precursor, chemically pure nanoparticels, applicability for different materials.

Material properties of NiTi-nanoparticles generated by laser ablation in different liquids have been analyzed and are presented here.  Depending on the processes environment, the composition of the generated nanoparticles differs from the bulk material. Also, an oxide layer (core-shell) is formed on the NiTi-nanoparticles surface. The thickness of the layer differs depending on the organic liquids. Along with the change of the surface layer, various crystalline structures are obtained. The lattice structure and lattice space of the nanoparticles are investigated by the transmission electron microscopy (TEM) and x-ray diffraction analysis (XRD). There are different methods to evaluate the shape memory effect (SME) of the generated NiTi-nanoparticles. In the present study, we investigated the phase transformation by the temperature XRD.

References:

[1] S. Barcikowski, A. Hahn, M. Guggenheim, K. Reimers, A. Ostendorf: Biocompatibility of nanoactuators: stem cell growth on laser-generated nickel–titanium shape memory alloy nanoparticles, J Nanopart Res., 12, 1733–1742, 2010

[2] G. A. Shaw, D. S. Stone, A. D. Johnson, A. B. Ellis, W. C. Crone: Shape memory effect in nanoindentation of nickel–titanium thin films, Appl. Phys. Lett., 83, 257-259, 2003 

[3] W. Rong, W. Ding, L. Mädler, R. S. Ruoff, S. K. Friedlander: Mechanical Properties of Nanoparticle Chain Aggregates by Combined AFM and SEM: Isolated Aggregates and Networks, Nano Lett., 6, 2646-2655, 2006

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