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Table 1 Levels of factor of orthogonal design

From: The situ preparation of silica nanoparticles on the surface of functionalized graphene nanoplatelets

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