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Sci Rep. 2015 Aug 21;5:13322. doi: 10.1038/srep13322.

Surface evolution of manganese chloride aqueous droplets resulting in self-suppressed evaporation.

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Nano Science and Technology Program / Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Institute of Chemistry, the Chinese Academy of Sciences, Zhongguancun North 1st St, Haidian, Beijing, China.
Chongqing University, No. 174 Shazhengjie, Shapingba, Chongqing, 400044, China.
Institute of Physics, Chinese Academy of Sciences, Haidian, Beijing, China.


The exchange kinetics of liquid water, which are of fundamental interest and have potential applications, remain unclear. A fantastic and extraordinary phenomenon was observed during the evaporation of a water droplet doped with manganese chloride. As observed from the evolution of this type of droplet, a thin film was formed on the surface with an exothermic phase transition, resulting in self-suppressed evaporation. The MnCl2-doped water droplets were maintained in a relative humidity (RH) of 50% at 40 °C for more than a week and for longer than two months at a temperature of 25 °C. In contrast, a pure water droplet can only be sustained for a few minutes. The self-suppressed evaporation of doped water may be due to the special hydration of the accumulated manganese and chloride ions at the surface, decreasing the surface tension.

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