High frequency AC electrosprays: mechanisms and applications
High frequency AC electrosprays: mechanisms and applications
复制标题
高频交流电喷雾：机理和应用
DOI：
10.2495/afm060231
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Hsueh
中科院分区：
文献类型：
--
作者：
L. Yeo;Hsueh
我们最近发现了一种新的电喷雾现象，使用高频交流电场超过10千赫，其行为非常明显，从其直流电喷雾对应。实验和理论研究结果表明，等离子体充电起着重要的作用，在电流体动力学驱动的电喷雾界面动力学。这些研究结果表明，法拉第产生的界面等离子体极化层可以产生一个净正常的麦克斯韦应力，是负责气溶胶滴的产生。这种等离子体极化现象的实验结果，并采用标度理论来阐明的基本等离子体机制负责的现象。AC电喷雾能够产生微米和亚微米电中性液滴或聚合物纤维，并且是用于药物包封或生物材料合成的有前途的快速和便携式技术，用于控制释放呼吸药物递送、伤口护理治疗或组织/矫形工程。
We have recently discovered a new electrospray phenomenon using high frequency AC electric fields beyond 10 kHz which behaves very distinctly from its DC electrospray counterpart. Experimental and theoretical findings have demonstrated that plasma charging plays a significant role in the electrohydrodynamically-driven interfacial dynamics of the electrospray. These findings show that Faradaic generation of interfacial plasma polarized layers can produce a net normal Maxwell stress that is responsible for the generation of aerosol drops. Experimental results of this plasma polarization phenomenon are presented and scaling theory is employed to elucidate the underlying plasma mechanism responsible for the phenomenon. The AC electrospray is capable of producing micron and sub-micron electroneutral drops or polymeric fibers and is a promising rapid and portable technology for drug encapsulation or biornaterials synthesis for controlled release respiratory drug delivery, wound care therapy or tissue/orthopaedic engineering.