Abstract
Researchers have developed a way to make surfaces switch between sticky and slippery states using electric voltage, by controlling ions and water at the molecular level.
Key Discovery
Scientists at National Taiwan University created an adhesion switch on self-assembled monolayers of aromatic molecules at the solid-liquid interface. By applying voltage to the gold surface below, they direct sodium ions to either anchor in the layer—forming a stable water barrier that repels mica—or expel them, allowing attraction.
This electromechanical control toggles surface properties instantly, driven by ion structuring.
"This system shows a very peculiar mechanism for specific ion structuring and capturing that opens up fascinating new possibilities for understanding and utilizing interface phenomena," says Prof. Hsiu-Wei Cheng, co-corresponding author.
Implications
Such responsive surfaces hold promise for lubricants, coatings, sensors, and electronics, where tunable adhesion boosts performance.
Author's summary: National Taiwan University researchers pioneered voltage-controlled ion and water structuring on aromatic monolayers, enabling surfaces to reversibly switch from repulsive to adhesive states for advanced tech applications. (148 characters)
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