Differential mobility analysis of nanoparticles generated by laser vaporization
and controlled condensation (LVCC) |
| |
Authors: | Victor Abdelsayed M Samy El-Shall Takafumi Seto |
| |
Institution: | (1) Department of Chemistry, Virginia Commonwealth University, Richmond, VA 23236, USA;(2) National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8564, Japan |
| |
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. |
| |
Keywords: | laser ablation condensation electrical mobility thermophoresis silicon iron aluminide measurements nanoscience |
本文献已被 SpringerLink 等数据库收录! |