Differential mobility analysis of nanoparticles generated by laser vaporization and controlled condensation (LVCC)
Differential mobility analysis of nanoparticles generated by laser vaporization
and controlled condensation (LVCC)
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激光汽化和受控冷凝 (LVCC) 产生的纳米颗粒的微分迁移率分析
DOI：
10.1007/s11051-005-9015-z
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发表时间：
2006
影响因子：
2.5
通讯作者：
T. Seto
中科院分区：
文献类型：
--
作者：
V. Abdelsayed;M. S. El;T. Seto
采用激光汽化控制冷凝(LVCC)法制备了硅铁铝化物(FeAl)纳米粒子。激光烧蚀固体靶产生的颗粒在新设计的流体式LVCC腔内，在明确的热场和电场作用下传输和沉积。纳米颗粒的沉积过程受外力的平衡控制，即气流、热电泳力和静电力。用低压差示迁移率分析仪(LP-DMA)分析了生成的纳米粒子的尺寸分布。通过改变载气压力(20~200T)、室内温度梯度(ΔT=0~190℃)和板间电场(E=0~3000V/m)，分析了合成条件对产物尺寸分布的影响。研究发现，静电场能有效地选择性沉积小尺寸纳米颗粒(约10 nm)，并能有效地驱散大液滴状颗粒。
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.