Laser- and Magnetron-Modified Injecting Surfaces of Electrodes for EHD Transducers

The purpose. The experimental detection of the effect of laser scribing and magnetron sputtering on the sign of charge formation of wire electrohydrodynamic electrode pairs immersed in a PMS-50 (polymethylsiloxane liquid coolant). Objectives. Determination of laser irradiation modes leading to the most developed microstructures on the surface of copper wire electrodes. Investigation of the presence and distribution density of self-organized structures into groups of nanostructures under irradiation. Obtaining anisotropy of current-voltage characteristics for different variants of cathode-anode pairs.

Methodology. The surface of wire copper electrodes was modified by laser scribing on the FMark-20RL marking complex with a power density in a laser beam pulse of about 4,8∙109 W / cm2 (with a pulse frequency of 100 kHz, a wavelength of 1060 nm). The surface structures of electrodes after treatment with a laser beam with a diameter of ~80 μm with a propagation step of 50-80 μm and obtained additionally by magnetron sputtering on a MVU TM Magna T setup were studied by scanning electron microscopy on a JEOL 6610lv SEM. The peculiarities of charge formation from the obtained modified electrodes were investigated by the method of current-voltage characteristics (I-V) using a Keithley 6487 picoammeter and a high voltage source Mantigora NT-6000R.

Results. For cathodes made of copper wire electrodes scribbled by laser radiation and coated with magnetron sputtering, the current-voltage characteristics reveal a nonlinear growth, which is described indirectly in the high-voltage part by the field emission mechanism of electrical conductivity. Nonlinear growth starts from the initial site.

Conclusion. Electric fields localized at the tops of structures additionally arising during magnetron sputtering on micro- and nanostructures, the surface of electrodes ablated by laser radiation, leads to a predominant unipolar injection of electrons from the cathode, similar to field emission, which can be used in the development of high-performance electroconvective systems.

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