快猫短视频s have finally pinned down the precise thickness of the barrier between water and air. This finding could offer fresh insights into atmospheric science and even help ramp up renewable energy production.
鈥淲e have water in our human body, we have water in the atmosphere. Water is everywhere, but there鈥檚 still a huge lack of knowledge about water,鈥� says at the Fritz Haber Institute of the Max Planck Society in Germany.
Water molecules are usually oriented randomly, but the researchers knew that those on the surface take on a special alignment because they cannot form hydrogen bonds with air molecules above them. Still, the extent of this effect remained unclear.
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To find out just how far down this goes, the researchers vibrated water molecules with two specially calibrated laser beams and analysed changes in the properties of the reflected light, such as frequency. To isolate the effects of the unusually oriented interface molecules, they cross-referenced measurements from two different water samples 鈥� one of which had hydrogen atoms swapped for deuterium, a hydrogen isotope.
It took about 60 hours of measurements to obtain a precise result, says team member at the Fritz Haber Institute. They found that the boundary between air and water must contain roughly three layers of water molecules, a region less than a single nanometre thick.
Understanding how water molecules behave in various chemical reactions and interfaces could help us improve or better understand many crucial processes, such as catalysis reactions in chemistry, atmospheric gases dissolving into the ocean and efforts to split hydrogen for energy production, says at the 脡cole Normale Sup茅rieure in Paris. And while the new measurement aligns with past theoretical calculations, he says no theoretical consensus exists for other properties of the air-water interface 鈥� that will be up to future experiments.
arXiv
