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Table 2 Selected levels for the process parameters used during experiments

From: Evolution of Zinc Oxide Nanostructures Grown on Graphene by Ultrasonic Spray Pyrolysis and Its Statistical Growth Modelling

Level Flow rate (ml/min) Temperature (°C) Time (min) Molarity (M)
Initial 0.01 135
First 0.05 210 0.5 0.05
Second 1 355 15.25 0.2
Third 8 500 30 0.4
Fourth 10 575 38 0.7