We discovered for the first time a fundamental phenomenon that arc discharge plasma can be easily triggered in liquid through jetting liquid metal stream to the electrode under only very small voltage. Along with the liquid metal stream, repetitive plasmas with light emission were generated which could last for several milliseconds each time, yet with a consistent current. The principal peaks of such optical emission spectrum lie in the ultraviolet and visible blue and violet sections, which are mainly caused by the plasma of gallium and indium. Some micro/sub-micro metal droplets and other arbitrary-shaped products such as “liquid metal pea” were also fabricated via the process. A series of critical factors to affect such fundamental events were experimentally clarified and interpreted. This finding opens an extremely easy and unconventional way to generate plasma at room temperature which would offer diverse applications such as serving as a light emitter for either optical or ultraviolet illuminations, as an electroacoustic source, or fabricating micro or particles of the liquid metal and other compounds.
Comments: 11 pages, 4 figures, 1 table.
[v1] 2016-01-09 22:13:59
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