Abstract
The research field of plasma–liquid interactions is quickly expanding due to its great potential in many applications, including nanomaterial synthesis. In this paper, we present a novel kind of in-liquid discharge that is generated at or near the interface of two immiscible liquids, water and liquid hydrocarbon. The optical emission characteristics of this discharge are studied using ICCD imaging, and their dependence on the position of the interface with respect to the electrode are analyzed. The results show that when the electrode is at the interface, discharge efficiency is optimal due to increased discharge probability and plasma volume. Moreover, when the electrical conductivity of the solution is increased beyond ~ 500 µS/cm, the discharge mode transits from streamer to spark. Analysis of the nanomaterial produced by interfacial discharges reveals that when the discharge is ignited at the interface of distilled water-heptane, amorphous carbonaceous sheet-like materials are formed; however, when Ni-nitrate is added to raise the electrical conductivity of water, Ni nanoparticles embedded in C-matrix are synthesized. Furthermore, the particle surface density in the C-sheet increases at higher electrical conductivity. As the discharge transits from streamer (low conductivity) to spark (high conductivity), the amorphous C-sheet becomes graphitized. When two or three salts (Ni-, and/or Co-, and/or Fe- nitrate) are added at the high conductivity condition (5000 µS/cm), nanoalloys (NiCo, NiFe, CoFe, and NiCoFe) embedded in C-matrix are formed. Overall, the data reported herein demonstrates interfacial discharges in liquid offer great opportunities for efficiently and ecologically synthesizing novel nanomaterials with unique properties.
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This work was financially supported by the National Science and Engineering Research Council (NSERC) RGPIN-2023-03951.
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Hamdan, A. Exploring the Discharge Phenomenon at the Interface of Immiscible Liquids: Current Understanding and Potential Applications in Nanomaterial Synthesis. Plasma Chem Plasma Process (2023). https://doi.org/10.1007/s11090-023-10413-z
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DOI: https://doi.org/10.1007/s11090-023-10413-z