Bubble generation in a nanoconfined liquid film between dielectric-coated electrodes under alternating current electric fields

Guoxin Xie; Jianbin Luo; Shuhai Liu; Guo, Dan; Zhang, Chenhui
May 2010
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p223104
Academic Journal
In this letter, the bubble generation behavior in a nanoconfined liquid film under external alternating current (ac) electric fields (EEFs) has been investigated with the relative optical interference intensity technique. A counterintuitive phenomenon has been found that bubbles generate more easily and intensively when the electrode is coated with a dielectric coating while the total electrical power in the system is significantly lower than the case without the coating. The bubble generation under ac EEFs has been found to be highly ac frequency dependent. The variations in the threshold external voltage and current beyond which bubbles begin to generate with the frequency become more significant in the system with a dielectric-coated electrode. Mechanisms of these experimental phenomena have been discussed.


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