Abstract
A simple method for probing the interface of a liquid–liquid system is proposed. Two immiscible liquids are chosen and one is a UV curable monomer. When the two liquids meet, a curved interface is formed. Such an interface can be fixed once the liquid monomer has been solidified by UV exposure. After removing the uncured liquid, the solidified surface, which records the information of the liquid–liquid interface, can be observed directly. Our result shows that the surface of the cured monomer is smooth as the liquid–liquid contact time is less than 12 h. As the contact time is long enough, the surface becomes rough. However, the roughness does not go worse when the contact time is over 1000 h. Atomic force microscope (AFM) shows that the roughness of the interface is due to the formed tiny holes and bumps. Detailed results are given and the impact of surface roughness on the device performance, such as liquid lenses, is analyzed.
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