The reporter learned from the University of Science and Technology of China that Professor Wu Hengan and Dr. Wang Fengchao from the Department of Modern Mechanics at the School of Engineering Science have joined forces with Nobel laureate and Professor Andre Geim from the University of Manchester in the UK to explore the potential of graphene-based functional materials. Their groundbreaking research has led to a significant discovery: graphene oxide films can precisely and rapidly filter ions, opening up new possibilities in material science.
This research, published in the latest issue of *Science*, reveals that when graphene oxide films are immersed in water, they form capillary channels approximately 0.9 nanometers wide. These channels allow small ions or molecules—those with diameters under 0.9 nm—to pass through quickly, while larger ions are completely blocked. This selective filtration is not only highly accurate but also thousands of times faster than traditional diffusion methods.
Professor Wu Hengan’s team used theoretical analysis and molecular simulations to uncover the mechanism behind this rapid ion filtration. Their findings suggest that the interaction between graphene and ions leads to ion accumulation within the nanochannels, which enhances the speed of ion movement. This phenomenon, dubbed the "ion sponge effect," helps explain the observed results and could lead to more efficient filtration technologies.
Experts believe that by compressing the capillary channels in the film using mechanical techniques, it may be possible to effectively remove salt from seawater. This could pave the way for practical desalination devices capable of turning seawater into drinkable water in just minutes, turning what was once a sci-fi vision into a real-world solution.
*Science* has highlighted the significance of this breakthrough, noting that the findings position graphene oxide films as key players in various separation technologies, including desalination, purification, sensing, and energy conversion. With further development, these materials could revolutionize how we handle water and other critical resources.
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