In a groundbreaking discovery, Flinders University researchers in Australia have achieved the synthesis of various gold nanoparticles by adjusting water flow in a vortex fluidic device, eliminating the need for harmful chemicals. This innovative approach, detailed in the article 'Nanogold Foundry Involving High-Shear-Mediated Photocontact Electrification in Water,' published in Small Science, also unexpectedly resulted in the production of hydrogen and hydrogen peroxide through a contact electrification reaction in water. The collaborative study involved scientists from Australia and overseas who explored different parameters and concentrations to tailor the size and form of the gold nanoparticles. Lead researcher Badriah Mazen Alotaibi highlighted the discovery of a new phenomenon at the solid-liquid interface within the vortex fluidic device, showcasing potential applications in various chemical and biological reactions. The team successfully synthesized pure gold nanoparticles in water, promoting a green, waste-minimizing process with enhanced scalability and the generation of nanoparticles possessing novel properties crucial for diverse applications. Gold nanoparticles play a vital role in fields such as drug delivery, catalysis, sensing, and electronics due to their unique physical, chemical, and optical properties. The vortex fluidic device, introduced by Professor Colin Raston, enables precise control over particle specifications by adjusting rotational speeds and applying external light, revolutionizing the synthesis of nanomaterials. This development represents a significant step towards sustainable nano-scale processing techniques, with the high shear regimes of the device leading to exciting advancements like contact electrification. Professor Raston emphasized the paradigm shift in material synthesis, highlighting the potential for a more sustainable future by utilizing water as the primary medium without the requirement of additional chemicals. The research not only contributes to the green chemistry domain but also paves the way for efficient and environmentally friendly production methods for crucial nanomaterials.