Taming plasma instability for uniform nanoparticle production: load topology optimization in electrical-explosion synthesis

Plasma instability and discharge randomness is the main challenge in achieving precision nanoparticle synthesis via electrical explosion. This study presents a split-wire array load configuration strategy to enhance the product uniformity. Through controlled experiments with 500 J discharge energy on 25 mg metal conductors, synchronized high-speed imaging and electrophysical diagnostics reveal that increased specific surface area (achieved via wire splitting) effectively suppresses electro-thermal/plasma instabilities and secondary breakdown, compared to conventional single-wire configuration. Systematic analysis demonstrates at least a 60 % reduction in nanoparticle mean diameter (from 55.10 nm to 20.60 nm) and improved polydispersity index (∼45.36 % reduction) with optimized load topology. The spatial-temporal evolution of phase transitions and ionization processes is quantitatively correlated with load geometry, establishing surface-area-dominated plasma dynamics as a critical mechanism for nanoparticle quality control. These findings provide a transformative approach to overcoming intrinsic limitations in electrical explosion synthesis through innovative load design.