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Permeability on ammonia gas concentration between droplets. Ammonia gas generating droplets were generated separately at ammonia gas concentration of 0.002 M (a), 0.02 M (b), 0.2 M (c) and 2 M (d) and mixed with indicator droplets, respectively. (e) Mean values of color exchange of indicator droplets for ammonia gas concentration (scale bar = 100 μm).
