Table 1

Levels of factor of orthogonal design
Level Factors
TEOS (g) NH3· H2O (g) Time (h)
1 0.3 0.6 4
2 0.6 1.2 6
3 0.9 1.8 8

Li et al.

Li et al. Nanoscale Research Letters 2014 9:172   doi:10.1186/1556-276X-9-172

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