Table 1.

The factors level setting of a 3-factors CCD matrix under coded values for the synthesis of zinc oxide nanoparticles (ZnO NPs).

Experimental Trial	Factors Level Setting
	A	B	C
1	−1	−1	−1
2	1	−1	−1
3	−1	1	−1
4	1	1	−1
5	−1	−1	1
6	1	−1	1
7	−1	1	1
8	1	1	1
9	−α	0	0
10	α	0	0
11	0	−α	0
12	0	α	0
13	0	0	−α
14	0	0	α
15	0	0	0
16	0	0	0
17	0	0	0
18	0	0	0
19	0	0	0
20	0	0	0