Liquid marbles, liquid droplets coated with hydrophobic powder, have been emerging as a useful microfluidic platform. The ease of their synthesis and manipulation allows liquid marbles to serve as a robust microreactor. However, liquid marbles suffer the unavoidable problem of evaporation. Exposed to an environment with relatively low humidity, the liquid marble buckles and collapses due to evaporation. A suitably noninvasive technique to refill the liquid marble with water may open better opportunities for liquid marbles in microfluidics. To date, there has been no report on noninvasive methods for refilling the deflated liquid marble after the evaporation and subsequent buckling. This paper reports the noninvasive automatic refilling of liquid marbles using the concept of vapor transfer through porous media and subsequent condensation.
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