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. 2022 Feb 2;12(7):4120–4134. doi: 10.1039/d1ra08723a

The experimental variables and levels based on the CCD method.

Factors Units Level Coded low Coded high Mean Standard deviation Relative standard deviation
Low High
σ X 1 mN m−1 1.75 36.00 −1 ↔ 1.75 +1 ↔ 36.00 17.28 14.28 0.83
A f X 2 cm s−1 0.60 1.30 −1 ↔ 0.60 +1 ↔ 1.30 0.90 0.16 0.18
V c X 3 mm s−1 0.41 1.08 −1 ↔ 0.41 +1 ↔ 1.08 0.63 0.24 0.38
V d X 4 mm s−1 0.08 0.97 −1 ↔ 0.08 +1 ↔ 0.97 0.44 0.19 0.43