A glass pipette (World Precision Instruments) whose outer diameter is 1.0 mm and the inner diameter is 0.5 mm was pulled with a pipette puller (Sutter P-1000) to prepare a nozzle whose inner diameter is 10 to 40 μm. The tip of the nozzle was dipped into 1H,1H,2H,2H-perfluorodecane-1-thiol (Sigma-Aldrich) solution [0.1 wt % (weight %) in dimethylformamide] for 30 min to make a hydrophobic self-assembled layer on the surface of the nozzle tip.

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