Researchers from the University of California, Irvine, and Tel Aviv University have unveiled a first-of-its-kind ratchet-based ion pump.
A new device has no gears and requires no fuel. It doesn’t even use a single chemical reaction. Yet, it can pull salt and heavy metals out of water using nothing more than a rapid electrical shiver.Researchers from the University of California, Irvine, and Tel Aviv University have unveiled a first-of-its-kind ratchet-based ion pump.
As compared to standard pumps, it moves charged particles through a liquid using only a low-voltage electrical signal — no moving parts, no chemicals, and no high-energy reactions required.In tests, the team achieved 50 percent salt removal from water using this method.Chemical-free pumpManaging how ions move through fluids is vital for many things, from clean water to human biology. But current man-made pumps are often held back by messy, expensive chemistry. These existing systems typically consume a huge amount of energy and depend on complex electrochemical reactions, which limit overall efficiency. This new technology sidesteps those hurdles, replacing power-hungry chemical processes with a cleaner, more streamlined electrical approach.It uses a thin, porous wafer coated in metallic layers. Applying a low-voltage signal that switches on and off at lightning speed creates what physicists call a ratchet effect.“Ratchets are nonequilibrium devices that use temporally controlled input signals and spatial asymmetries to drive a steady-state particle flux,” said Shane Ardo, UC Irvine professor of chemistry. “The combination of structural asymmetry and the unique nanoscale properties of metal-electrolyte interfaces provides the necessary ingredients that make the ratchet work,” the co-lead author added. This new ion pump functions like a solid-state traffic controller for molecules, using a nanoporous membrane sandwiched between two ultrathin metal layers. It exploits the asymmetrical charging and discharging of these metal surfaces in a liquid by rapidly pulsing a low-voltage electric field. This imbalance creates a built-in voltage that pushes ions in a single, steady direction — a ratchet effect — without requiring any of the complex chemical reactions or high energy consumption typical of traditional filters.Proof of conceptFor testing, researchers built a solid-state deionization system that successfully removed 50 percent of salt from water with minimal voltage. It was demonstrated that the device can maintain a steady flow of particles even when pushing against opposing forces by pairing the pump with ion-selective membranes that create a specialized ionic circuit.This setup confirms that the pump can extract salt into a separate cell without moving parts or the high-energy chemical reactions that plague current desalination methods.“Selective separation can be useful for a wide variety of applications—more effective drinking water purification for one, but also harvesting lithium ions from seawater, a range of biomedical devices, and recycling battery materials,” said Gideon Segev, associate professor of electrical engineering at Tel Aviv University.“The ability to remove trace amounts of ions from a liquid mass can be transformative for treating water contaminated with heavy metals,” he added. Beyond just purifying water, this technology’s precision allows it to target toxic heavy metals like lead — at concentrations as low as a few parts per billion — without stripping away the essential minerals humans need. This accuracy opens the door to a wide range of global breakthroughs, from low-cost desalination and high-efficiency battery recycling to harvesting lithium from the ocean and powering advanced medical implants. The study was published in the journal Nature Materials.
Energy &Amp Environment Inventions And Machines Ion Pump Sustainability Water Purification
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