Abstract
Silicon and iron aluminide (FeAl) nanoparticles were synthesized by a laser vaporization controlled condensation (LVCC) method. The particles generated by the laser ablation of solid targets were transported and deposited in the presence of well-defined thermal and electric field in a newly designed flow-type LVCC chamber. The deposition process of nanoparticles was controlled by the balance of the external forces; i.e., gas flow, thermophoretic and electrostatic forces. The size distributions of generated nanoparticles were analyzed using a low-pressure differential mobility analyzer (LP-DMA). The effect of synthesis condition on the size distribution was analyzed by changing the pressure of the carrier gas (20–200 Torr), the temperature gradient in the LVCC chamber (ΔT=0–190°C) and the electric field applied between the LVCC chamber plates (E=0–3000 V/m). It was found that electrostatic field was effective to selectively deposit small size nanoparticles (about 10 nm) with expelling large droplet-like particles.
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Acknowledgements
Authors are grateful to Igor N. Germanenko for the useful discussion and help in the experiments at VCU. TS’s VCU visit was supported by the New Energy and Industrial Technology Development Organization (NEDO) of Japan.
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Abdelsayed, V., El-Shall, M.S. & Seto, T. Differential mobility analysis of nanoparticles generated by laser vaporization and controlled condensation (LVCC). J Nanopart Res 8, 361–369 (2006). https://doi.org/10.1007/s11051-005-9015-z
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DOI: https://doi.org/10.1007/s11051-005-9015-z