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Electrospraying apparatus: (1) high voltage generator, (2) poly(methyl- methacrylate) chamber, (3) syringe pump with different needle gauges for feeding the test solution and (4) grounding. In the chamber were: (5) metal needle with obtained Taylor cone-jet, (6) collector (crystallizing dish with flat bottom, with 50 mL of 5 wt.% NaOH solution and magnetic stirring bar, isolated with aluminum foil) and (7) temperature and relative humidity sensor.
