Observation of the partial reheating of the metallic vapor during the wire explosion process for nanoparticle synthesis
Observation of the partial reheating of the metallic vapor during the wire explosion process for nanoparticle synthesis
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DOI：
10.1063/1.4881838
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发表时间：
2014-06
影响因子：
4
通讯作者：
B. Bora;S. S. Kausik-S.;C. S. Wong;O. Chin;S. Yap;L. Soto
中科院分区：
文献类型：
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作者：
B. Bora;S. S. Kausik-S.;C. S. Wong;O. Chin;S. Yap;L. Soto
本文利用时间分辨成像技术，研究了金属丝爆炸法制备Cu纳米颗粒过程中蒸汽的膨胀和电弧等离子体的形成过程，了解电弧等离子体的形成对部分再加热法制备Cu纳米颗粒特性的影响。当提供的能量足以维持等离子体时，电弧等离子体可以延迟形成，也可以立即形成，这取决于环境和压力。用时间分辨成像方法观察了在电弧等离子体延迟形成的情况下，两个膨胀的同心圆柱体相互嵌在一起的情况，表明导线材料的蒸气在电弧等离子体膨胀之前膨胀。由于电弧等离子体前部蒸汽的膨胀，一些线材可能不会被电弧等离子体再加热，而不是立即形成电弧等离子体的情况，在这种情况下，蒸汽被期望完全再加热....
In this paper, an experimental study using time resolved imaging was reported to study the expansion of the vapor as well as subsequent formation of the arc plasma during the synthesis of Cu nanoparticles by wire explosion process to understand the influences of arc plasma formation on the characteristics of the produced nanoparticles by means of partial reheating of the vapor. Arc plasma is known to form after a delay or immediately depending on the ambience and pressure when the supplied energy is sufficient to sustain the plasma. Observations of two expanding concentric cylinders one inside another by time resolved imaging in the case of delayed formation of arc plasma suggest that the vapor of the wire material is expanding in front of the expansion of the arc plasma. Due to the expansion of the vapor in front of the arc plasma, some of the wire material may not be reheated by arc plasma as opposed to the case of immediate formation of arc plasma, where the vapor is expected to be reheated completely....